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Is AI Smarter Than Humans?

Understanding IQ

Is AI Smarter Than Humans? What the 2026 Benchmarks Show

Ask whether AI is smarter than humans and the honest answer depends entirely on the task. Frontier systems now beat expert humans on graduate-level science questions and lose to ordinary people on puzzles built to be unfamiliar. Here is what the 2026 benchmarks actually measure, and why one score never settles it.

Chart comparing machine and human performance across four task types, showing machines ahead on graduate science questions and coding, level on novel puzzle solving, and behind on tasks never seen before

Is AI smarter than humans? On narrow, well-specified tasks the answer in 2026 is often yes, and increasingly by a wide margin. On problems a system has never seen before, described by nobody, with no worked example to copy, people still hold the advantage. The reason both statements are true at once is that "smarter" is not one axis, and the tests that make machines look unbeatable and the tests that stop them cold are measuring genuinely different things.

This article takes the comparison domain by domain, using figures published by the labs and by independent evaluators in 2026, and then explains the structural difference that makes a single answer impossible.

What AI already does better than most people

The clearest machine wins are on tasks with a correct answer, a large body of prior examples, and no requirement to act in the world. On GPQA Diamond, a set of graduate-level biology, chemistry and physics questions written to be hard for people with access to a search engine, OpenAI reported GPT-6 Astra at 96.0 percent in September 2026. Gemini 3.1 Pro sits at 94.3 percent. Both are above the performance of domain experts answering outside their own speciality.

The same pattern holds across coding, long-document retrieval and structured professional work. These are not trick results. They are real, they are reproducible, and they describe abilities that took people years of training to acquire.

  • Recall and synthesis at volume. No person holds the contents of a technical literature in working memory. A model effectively does.
  • Speed. Work that takes an expert a day is returned in minutes, which changes what is worth attempting.
  • Consistency. A model does not get tired on the four-hundredth item, which is exactly where human scorers drift.
  • Breadth of surface knowledge. Competence across far more fields than any individual can maintain.

Where humans still hold the edge

The sharpest counterexample is ARC-AGI-3, a benchmark from the ARC Prize Foundation built specifically to test learning rather than recall. A system is dropped into a small turn-based environment with no instructions and has to work out the goal, the controls and the rules by acting inside it. Crucially, every environment is calibrated on people first: humans solve 100 percent of them, because a task is only admitted once people have shown it can be done.

That calibration is what makes the comparison meaningful, and it is the detail most coverage drops. We set out the full argument in our report on what ARC-AGI-3 measures. The short version: when the novelty is real and the instructions are absent, the gap between an ordinary adult and a frontier system has been enormous.

That gap is now closing fast, and the way it closed is instructive. In September 2026 the ARC Prize Foundation reported GPT-6 Astra at 62.7 percent on its neutral, provider-independent test harness — and 99.9 percent on a harness supplied by the model’s own developer, which preserves the system’s reasoning state between moves. Same model, same benchmark, same week. The scaffolding around the model accounted for most of the difference.

Is AI smarter than humans at learning new things?

This is the question the benchmark was built to ask, and the 2026 answer is genuinely mixed. On action efficiency — how many moves a solver needs to work an unfamiliar environment out — the ARC Prize Foundation found that Astra used fewer actions than the median tested human on 96 percent of the levels it completed, and 51.7 percent fewer actions per level on average. By that measure the machine matched and passed human parity.

Cost tells a different story. The human baseline came from around 500 members of the public, paid roughly 12.78 dollars per game attempted. The model runs that produced those scores cost between 17,332 and 26,098 dollars. The system that learns as efficiently as a person in moves does so at several thousand times the price in resources.

Both numbers are real, and neither alone answers the headline question. That is the pattern to expect from here.

Chart comparing machine and human performance across four task types, showing machines ahead on graduate science questions and coding, level on novel puzzle solving, and behind on tasks never seen before
Chart comparing machine and human performance across four task types, showing machines ahead on graduate science questions and coding, level on novel puzzle solving, and behind on tasks never seen before
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Where would your own score land?

Take the IIF-certified assessment and get your score with the scale it was measured on, the percentile it corresponds to and the confidence range around it — the three figures most online tests leave out.

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Why smarter is the wrong question

In people, mental abilities correlate. Someone who scores well on vocabulary tends to score well on spatial reasoning and on arithmetic, and the pattern is consistent enough that a single summary number carries real information. That pattern is the reason IQ works at all — we explain the underlying statistics in our explainer on the g factor.

Machines do not show that structure. A system can answer graduate physics correctly and then fail a coloured-grid puzzle that a ten-year-old solves in thirty seconds. Its abilities do not hang together, so no single number summarises them, and any ranking against a person depends entirely on which task you picked. This is not a temporary measurement problem. It is a real difference in how the two kinds of system are built.

  • Human ability is correlated; one score generalises across many tasks.
  • Machine ability is jagged; world-class in one domain, below average in the next, with no reliable pattern.
  • So a comparison needs a task, and any claim without one is not a measurement.

Does a benchmark score mean the same as an IQ score?

No, and the distinction matters more than it sounds. A benchmark result is a raw percentage: items solved out of items attempted. An IQ is not a percentage of anything. It is a position within a reference population, expressed on a scale with a defined mean, almost always 100, and a defined standard deviation, usually 15.

Turning a raw count into that position requires a norming study: the same test, administered under standard conditions, to a representative sample of the population the score will be read against. No such sample exists for machines, and it is not clear what one would even be. So a model can score 96 percent on a science exam without that number converting into any IQ at all. We take that argument apart properly in the article on what ChatGPT’s IQ score really is.

The same logic governs human scores, which is why a raw count on a reasoning test is meaningless until it is placed against a reference sample. That placement is exactly what the IQ percentile calculator does, and it is the step a benchmark percentage has no equivalent for.

When will AI be smarter than humans overall?

Predictions from serious people vary by decades, which is itself the most useful fact about them. Geoffrey Hinton has said he expects machines to surpass human intelligence within about twenty years. Others working on the same systems put it sooner or reject the framing entirely. There is no measurement that would settle the disagreement, because there is no agreed test — the problem we work through in the explainer on what AGI actually means.

What can be said with confidence is narrower. The hardest evaluations still defeat the best systems: on Humanity’s Last Exam, a set of expert-written questions across dozens of fields, the strongest reported result in September 2026 was 65.0 percent, meaning better than a third of the questions remained unanswered. Benchmarks that were supposed to hold for years keep falling, and new ones keep being built because the old ones stop separating anything.

What this means for measuring your own intelligence

None of this changes what a cognitive test does for a person. The reason matrix puzzles sit near the centre of most non-verbal reasoning tests is that they lean as little as possible on what you happen to know and as much as possible on working out a rule from the evidence in front of you. That the same format is what machines found hardest is a point in favour of the format, not against it.

If the comparison has made you curious about your own reasoning rather than a model’s, our IQ test is built around exactly this kind of rule-finding, and the result is reported the way a score has to be reported to mean anything: as a position in a reference population, with a range around it. For what those numbers do and do not predict, the evidence on outcomes is a better guide than any headline about machines.

The durable conclusion is unglamorous. Machines are now better than most people at a growing list of specific things, worse at a shrinking list, and not comparable at all on the single scale the question implies. Anyone offering you one number for it is selling something.

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Tagged AI and intelligence, AI benchmarks, artificial intelligence, cognitive ability, fluid reasoning, G Factor, general intelligence, human intelligence, intelligence research, intelligence test, IQ Science, is ai smarter than humans, machine learning, reasoning tests

Does Exercise Raise Your IQ?

Mind & Everyday Life

Does Exercise Raise Your IQ? What Aerobic Fitness Changes

Aerobic exercise has some of the best-replicated cognitive evidence of any lifestyle factor, but not for a full IQ score. What reliably improves is executive function: working memory, inhibitory control, cognitive flexibility. One related skill, planning, barely moves at all.

Bar chart of aerobic exercise effects on four executive function skills, showing real improvements in inhibitory control, working memory and cognitive flexibility, and no significant change in planning

For a specific, well-defined slice of cognition — called executive function, covering things like ignoring distraction, holding information in mind, and switching between tasks — yes: aerobic exercise has a real, repeatedly replicated benefit. For a full IQ score, the case is thinner, and unlike chess, video games or reading, exercise is not really a story about practicing a mental skill at all. It works, as far as anyone can tell, through the body.

That is a genuinely different mechanism from the other three activities in this batch, worth sitting with before comparing the results. Chess and reading are both about practicing something mentally specific and asking how far the benefit travels. Exercise is a physiological intervention that happens to have cognitive side effects, and the research asks a slightly different question: how much exercise, for whom, delivered how, and sustained for how long, rather than how many hours of deliberate practice a particular skill needs.

What moves, and by how much

Meta-analyses of aerobic-exercise programs in healthy middle-aged and older adults find real improvements on three separate executive-function measures: cognitive flexibility, working memory, and inhibitory control — the ability to hold back an automatic but wrong response. All three effects are small to moderate in size and consistent enough across studies to be taken seriously.

A fourth measure, planning ability, did not show a statistically reliable improvement in the same body of research. That is worth including precisely because it is the negative result: exercise is not simply a uniform boost to every kind of executive skill, and a chart that only showed the three positive findings would be more flattering than accurate.

  • Cognitive flexibility. A real, moderate improvement — the largest of the four.
  • Working memory. A real, moderate improvement, close behind flexibility.
  • Inhibitory control. A real but smaller improvement.
  • Planning. No statistically reliable improvement in this population.
Bar chart of aerobic exercise effects on four executive function skills, showing real improvements in inhibitory control, working memory and cognitive flexibility, and no significant change in planning
Bar chart of aerobic exercise effects on four executive function skills, showing real improvements in inhibitory control, working memory and cognitive flexibility, and no significant change in planning

The same pattern in children

The adult numbers above are not an isolated finding. Separate reviews of aerobic-exercise programs in children and adolescents with ADHD found moderate improvements across the same three skills — inhibitory control, working memory and cognitive flexibility — and a review focused on overweight and obese children found a similar moderate improvement in overall executive function, driven mainly by inhibitory control and working memory rather than cognitive flexibility.

Lining those studies up next to each other matters more than any single number in them. Three reviews, three different populations — healthy older adults, children with ADHD, children carrying excess weight — using different exercise programs and different research teams, and all three land on roughly the same short list of skills: inhibitory control and working memory move fairly reliably, cognitive flexibility often does too, and the least consistent finding across all of them is planning. A single study finding a benefit could easily be a fluke. The same shape of result recurring across unrelated populations is a much harder pattern to explain away.

Why aerobic exercise might do this

The proposed mechanisms behind this are physiological rather than purely psychological in nature: sustained aerobic activity increases blood flow to the brain and appears to raise levels of growth factors involved in forming new connections between neurons, particularly in regions tied to memory and executive control. Human evidence for the exact chain from a training program to a measured cognitive gain is still being worked out, and much of what is confirmed comes from a mix of animal research and indirect markers in humans rather than one complete human causal pathway. The consistent behavioral result — better executive function after aerobic training — is on firmer ground than any single explanation for why it happens.

There is also a difference between a single session and a sustained program, and the two do not always point the same way. A single bout of moderate aerobic exercise can produce a short-lived boost to attention and inhibitory control lasting roughly an hour or two afterward, which researchers call an acute effect. A program of regular exercise sustained over weeks or months produces the more durable executive-function gains described above, through what looks like a slower, structural change rather than a temporary state. The two are related but not interchangeable, and a study measuring one says little about the other.

Your own number

Where would your own score land?

Take the IIF-certified assessment and get your score with the scale it was measured on, the percentile it corresponds to and the confidence range around it — the three figures most online tests leave out.

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Dose matters, and so does your starting point

The size of the benefit depends on how much exercise, how intense, and for how long, and studies that vary these do not all agree on the exact best combination. What is more consistent across this research is who benefits most: people who start out less fit, or with lower baseline cognitive performance, tend to show larger gains than people who were already fit and high-performing. The same general pattern — real benefits in children with attention difficulties, in sedentary older adults, and in children carrying excess weight — shows up across strikingly different groups, which is itself a form of evidence: a result this consistent across such different starting populations is harder to explain away as a fluke of any one study design.

That “lower baseline benefits more” pattern also shows up when comparing a single exercise session’s after-effects directly: people who perform worse on a cognitive task before exercising tend to show a bigger improvement afterward than people who already scored well. It is a pattern with an intuitive ceiling built in — there is more room for someone starting lower to move — but it also means the people most often used to headline this research, young healthy volunteers already near their own ceiling, may be exactly the group least likely to show a dramatic effect.

Executive function is not the same as a full IQ score

It matters that almost none of this research measures a full-scale IQ score directly. Executive function is one contributor to test performance, particularly on timed and working-memory-heavy sections, but a standard IQ battery also leans on things exercise research rarely touches, like accumulated vocabulary and abstract pattern reasoning. Processing speed and working memory are the parts of a typical test most plausibly connected to what exercise studies actually measure; treating a gain on an executive-function task as equivalent to a higher IQ score overstates what the research supports.

This is also why exercise and diet sit oddly next to chess, video games and reading in one respect: none of the exercise research reviewed here reports a full-scale IQ score before and after a program, the way a handful of the chess and brain-training studies at least attempt to. What exists is evidence about specific, named cognitive skills that overlap with part of what an IQ test measures, not a demonstrated change in the composite score itself. That is a genuine gap in the evidence, not a minor technicality, and a fair summary of this research has to say so rather than round “executive function improved” up to “IQ went up”.

So should you exercise for a sharper mind

For executive function specifically, aerobic exercise has some of the best-replicated evidence in this entire batch of questions, consistent across ages from childhood through later life; see how cognitive performance shifts across the lifespan and what early scores predict about later-life health for the surrounding picture. For a general IQ score, treat exercise the way this site treats diet: a real contributor among several, not a single lever. Nutrition and this article cover two of the more physiological factors; the full picture of what does and does not move the number ties them together.

The version of this claim worth actually believing is the modest one: regular aerobic activity is one of the better-supported ways to keep specific, useful mental skills sharp, particularly for anyone starting from a lower baseline, and that is true regardless of what it does or does not do to a single test score.

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Tagged aerobic exercise, BDNF, brain health, cognitive development, cognitive flexibility, executive function, exercise and iq, how to increase iq, Improving IQ Scores, intelligence test, IQ Science, nature vs nurture, physical activity, Working Memory

Does Reading Raise Your IQ?

Mind & Everyday Life

Does Reading Raise Your IQ? The Matthew Effect, Explained

Reading volume and vocabulary growth are genuinely linked, and the relationship compounds over years rather than staying fixed. But it is mostly the verbal, crystallized side of ability that moves, not the abstract reasoning an IQ test also measures, and cause and effect run both ways.

Line chart of vocabulary size across school grades for three reading-volume groups, starting close together in early grades and fanning out into a wide gap by the later grades

Reading volume and vocabulary growth are genuinely, strongly linked, and the relationship compounds over years rather than staying flat — psychologists call it a Matthew effect, after the biblical line about the rich getting richer. What it mostly moves, though, is verbal ability: vocabulary, background knowledge, comprehension. It is weaker evidence that reading raises the broader, more abstract reasoning an IQ test also tries to capture, and untangling cause from effect turns out to be harder than the popular version of this claim admits.

That distinction — which kind of ability actually moves — is the same question this batch keeps returning to with video games and exercise: a real, well-documented effect on something specific, next to a much weaker claim about intelligence in general.

The Matthew effect, named for a very old line

The psychologist Keith Stanovich described the pattern in the 1980s: children who decode text easily read more, and reading more builds vocabulary and background knowledge, which makes the next book easier to read, which leads to reading still more. Children who struggle with decoding do the opposite — they read less, encounter fewer new words, and fall further behind readers who started out only slightly ahead of them. The gap is not there from day one. It opens gradually, driven by a feedback loop rather than a single cause.

The name comes from a line in the Gospel of Matthew about the rich getting richer, and it is now used across psychology and economics for any process where a small early advantage compounds into a large later one, rather than staying the size it started at.

The same shape of feedback loop turns up outside reading too — in wealth, in athletic training, in scientific reputation — anywhere a small early edge changes how much opportunity or practice follows. Reading is simply one of the better-studied examples, because schools measure both sides of the loop, reading skill and vocabulary, on the same children year after year.

What the numbers show

This is not just a plausible story; it shows up in longitudinal data. One study tracking children from kindergarten through the later grades found that word-reading skill in fourth grade predicted the rate of vocabulary growth afterward, not just the vocabulary a child already had — and this held up even after statistically accounting for how large a child’s vocabulary already was back in kindergarten. Above-average readers were not just ahead; they kept pulling further ahead.

The same body of research found first-grade reading ability predicting outcomes measured in eleventh grade, a full decade later, and that the prediction survived even after removing the part explained by earlier general cognitive-ability scores. In plain terms: how well a child was reading in first grade told researchers something real about where they would land by the end of school, beyond what an early IQ-type score alone would have predicted.

Line chart of vocabulary size across school grades for three reading-volume groups, starting close together in early grades and fanning out into a wide gap by the later grades
Line chart of vocabulary size across school grades for three reading-volume groups, starting close together in early grades and fanning out into a wide gap by the later grades

How researchers try to separate cause from effect

Simply asking children how much they read is a weak measure, because struggling and confident readers describe their own habits very differently. A workaround used across much of this literature is a print-exposure checklist: a long list of real book and author titles mixed in with invented ones that sound plausible, where the score is how many real titles a person recognizes. It is a rough proxy for how much a person has actually read over the years, and because it does not ask anyone to self-report or take a vocabulary test directly, it gives researchers a way to measure reading volume that is not simply the same thing as the vocabulary score it is being used to predict.

Twin studies add a second angle. Comparing identical and fraternal twins raised in the same household lets researchers estimate how much of the overlap between reading habits and vocabulary is really about shared genes and shared upbringing, rather than reading causing vocabulary directly. That work generally finds a real, independent contribution from reading itself — it is not purely a proxy for something else the twins already had in common — but it is a smaller contribution than the raw, unadjusted correlation between reading and vocabulary would suggest on its own.

Your own number

Where would your own score land?

Take the IIF-certified assessment and get your score with the scale it was measured on, the percentile it corresponds to and the confidence range around it — the three figures most online tests leave out.

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Which kind of smarter this is actually about

Psychologists split intelligence into a fluid part — reasoning through a genuinely new problem with no learned content to draw on — and a crystallized part, built from accumulated knowledge and vocabulary. The Matthew-effect research is almost entirely about the second kind. Verbal IQ scores draw heavily on vocabulary and general knowledge, which is exactly what wider reading builds most directly; the more abstract, pattern-based reasoning on the non-verbal side of most tests has a much thinner connection to how many books someone has read. This split between accumulated, knowledge-based ability and raw, in-the-moment reasoning is one of the oldest and best-replicated distinctions in the field; other frameworks for describing distinct mental abilities cover related ground from a different angle.

Cause and effect also run in both directions, which the phrase “reading raises your IQ” tends to flatten into one. Children with larger early vocabularies find reading easier and therefore do more of it; the reading then builds the vocabulary further. Some of what looks like reading’s effect is really an early head start showing up again later, and the honest summary is a loop that reinforces an early difference rather than a one-way lever anyone can pull from a standing start.

Reading, EQ and other kinds of ability

It is worth being precise about what widening vocabulary actually buys a reader, socially as well as academically. A larger vocabulary and more background knowledge make it easier to follow, produce and be persuaded by complex arguments, which is a real advantage in school and at work even before it shows up as a higher test score. It is a different kind of advantage from the interpersonal skills covered in IQ versus EQ, which draw on a mostly separate set of abilities that reading volume on its own does not obviously move.

Does this still apply once you are an adult

Most of the strongest evidence here comes from childhood and the school years, when vocabulary and background knowledge are being built fastest and the gap has the most time to compound. The case for adult reading habits moving a fully developed vocabulary by a similar mechanism is much thinner — not because it has been disproven, but because it has simply been studied far less. What adult reading almost certainly still does is maintain and extend specific knowledge and vocabulary in whatever a person reads about, which matters for real-world communication and comprehension even without any change to a test score.

There is also a practical difference in what “reading” means at each age. A school-age Matthew effect is mostly about whether a child reads at all, and how much, since the comparison is against children who barely read outside class. An adult who already reads fluently is instead varying the topic, difficulty and volume of material that is, relatively speaking, a much smaller manipulation — more like choosing a harder workout than starting to exercise from nothing. That difference alone would predict a smaller effect in adulthood even if the underlying mechanism never changed.

So does reading raise your IQ

For the crystallized, vocabulary-and-knowledge side of ability, the evidence that reading volume matters is some of the strongest in this whole batch of questions — stronger than the case for chess or video games moving anything at all. For the fluid, reasoning side that IQ tests also measure, the case is much weaker, and at least part of the childhood effect is an early difference compounding rather than reading creating an advantage from nothing. The broader question of what actually moves an IQ score covers where reading fits next to environment and the other factors this site has looked at.

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Tagged cognitive development, crystallized intelligence, how to increase iq, Improving IQ Scores, intelligence test, IQ Score, Matthew effect, nature vs nurture, print exposure, reading and iq, reading habits, verbal intelligence, vocabulary growth

Do Video Games Raise Your IQ?

Mind & Everyday Life

Do Video Games Raise Your IQ? Near Transfer vs Far Transfer

Action video games produce real, replicated gains in spatial ability and attention, some of the best near-transfer evidence in this batch. Push the test further away, toward the general reasoning an IQ test measures, and the effect all but disappears once the research is pooled properly.

Horizontal bar chart of video game training effects by skill, showing a moderate improvement in spatial ability, a small improvement in executive function, and almost no measurable change in general intelligence test scores

For a narrow set of specific skills, yes: well-controlled studies find real improvements after training on action video games. For general intelligence — the broad reasoning ability an IQ test is built to capture — the answer from the same body of research is close to no. The gap between those two findings is the whole story, and it is a cleaner version of the same near-transfer, far-transfer pattern that shows up with chess.

That comparison is worth making explicit, because chess and video games have been studied with a similar structure and hit a similar wall: real, replicated gains on the trained task and its closest neighbours, and gains that shrink toward nothing the further the test sits from what was actually practiced. The two questions even share a villain: early studies with no proper comparison group, which is exactly the design flaw that inflated the first wave of both literatures before better-controlled follow-ups brought the estimates back down.

What gets sharper

The clearest, most replicated finding in this literature concerns a fairly narrow skill: mental rotation and other tests of spatial ability, where meta-analyses combining dozens of training studies find a moderately strong improvement after action-game practice. Related measures of visual attention — how much of a busy screen someone can track at once, how quickly they find a target among distractors — move in the same direction, though usually by less.

Executive-function tasks, which cover things like switching between rules or holding several items in mind while working with them, show a real but small average improvement across studies. It is a genuine effect, not noise, but it is a fraction of the size of the spatial-ability finding, and it varies a lot from one study to the next.

Not all video games are the same

Almost all of the research behind the spatial-ability and attention findings comes from one specific genre: fast-paced action games, usually shooters, that demand tracking multiple moving targets under time pressure. That is a deliberate choice by researchers, not an accident — the genre plausibly exercises visual attention and spatial tracking more directly than most other kinds of game — but it also means the finding does not automatically generalize to gaming as a whole.

Puzzle games, city-builders and slower strategy titles have been studied far less, and what research does exist finds effects, when present at all, on narrower skills that match whatever the specific game demands rather than on spatial ability broadly. The honest version of this article’s headline claim is narrower than “video games raise your IQ” or even “video games sharpen your mind”: it is closer to “a specific, well-studied genre reliably sharpens a specific, narrow set of visual and attention skills.”

What does not move

None of the genre caveat changes the picture for the specific genre that has actually been tested. Push the test further from the game itself, toward the kind of abstract pattern-matching an IQ test actually uses, and the effect all but disappears. A comprehensive pooling of the video-game training literature put the average improvement in measured intelligence at essentially zero once study quality was accounted for — smaller than the executive-function effect, and not reliably different from no effect at all.

  • Spatial ability. A real, moderately sized improvement — the strongest finding in the field.
  • Executive function. A real but small improvement, well short of spatial ability.
  • General intelligence. No reliable improvement once the studies are pooled properly.
Horizontal bar chart of video game training effects by skill, showing a moderate improvement in spatial ability, a small improvement in executive function, and almost no measurable change in general intelligence test scores
Horizontal bar chart of video game training effects by skill, showing a moderate improvement in spatial ability, a small improvement in executive function, and almost no measurable change in general intelligence test scores
Your own number

Where would your own score land?

Take the IIF-certified assessment and get your score with the scale it was measured on, the percentile it corresponds to and the confidence range around it — the three figures most online tests leave out.

Find your IQ score now!

Secure & encryptedInstant results10–20 minutes

Who these studies actually tested

It is a fair question, and worth asking directly. Most of this research compares people who already play action games heavily against people who do not, or takes non-gamers and puts them through several weeks of training in a lab. Both designs have a real limitation. The comparison studies cannot fully separate “gaming made these people sharper” from “people who were already sharper in this specific way found gaming more rewarding and stuck with it” — the same selection problem that comes up with chess players. The lab-training studies handle that better by assigning people randomly, but they mostly recruit young adults over a few weeks, which says little about children, older adults, or what happens after months or years rather than weeks.

Brain training apps are a different, weaker story

It is worth separating action video games, the subject of the research above, from commercial brain-training apps built specifically to raise IQ or memory scores. That literature has been reviewed on its own, and it fares worse than the action-game research: the trained tasks are usually closer to the test used to measure improvement, which inflates near-transfer scores without producing anything that looks like a durable change in general ability. A game built to be fun and only incidentally demanding on attention has, perversely, produced more convincing evidence than software built explicitly to train cognition.

This is not a fringe opinion inside the field. A group of cognitive scientists published an open letter warning that brain-training marketing was running well ahead of the evidence, and in the United States regulators fined at least one major brain-training company over advertising claims a court found were not adequately supported. None of that means the underlying tasks are useless as puzzles — it means the specific claim “this software will raise your IQ or stave off cognitive decline” has repeatedly outrun what the data backing it could support.

What sharper attention is actually worth

None of this makes the spatial and attention gains trivial. Faster, more accurate visual search and better mental rotation are useful in their own right — they plausibly touch some real-world tasks that lean on quick visual judgment — and they are large enough and reliable enough that a skeptical reader should not lump them in with the null result for general intelligence. What they are not is a stand-in for it. Processing speed is one of the specific abilities an IQ test does sample, and it is plausible some gaming-related gains touch it, but a faster reaction on a screen is a narrower thing than the reasoning an intelligence test is built to measure.

Some of the clearest demonstrations involve a measure called useful field of view: how much of a cluttered scene someone can take in and correctly identify in a single brief glance, without moving their eyes. Trained action-game players reliably outperform non-gamers on this measure, and non-gamers who are put through a training program show real gains within weeks. It is a genuinely useful skill outside a game, relevant to noticing a hazard at the edge of vision while driving, for instance — but it is a specific visual skill, not a general reasoning one, and it says little about how someone would perform on a matrix-reasoning IQ subtest that shows abstract shapes with no visual clutter to search through at all.

So should you game for a smarter brain

If the goal is a higher IQ score, action games are not a proven route to one, and the same is true of software marketed specifically as brain training. If the goal is a set of sharper, well-documented attention and spatial skills, the evidence for that is genuinely good. Those are different claims, and cognitive-training marketing has a long history of blurring them; this page on improving IQ covers what the wider evidence does and does not support, and reading is a useful contrast — a very different activity that moves a very different, more crystallized kind of ability instead.

The same test applies to anyone hoping a screen-based habit will double as brain training: ask what genre was actually studied, what the comparison group did, and whether the outcome measured was close to the game itself or genuinely far from it. A narrow, honest claim — “this sharpens visual attention” — has survived scrutiny here. The broader one has not.

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Tagged brain training, cognitive training, executive function, far transfer, fluid intelligence, how to increase iq, Improving IQ Scores, intelligence test, IQ Science, near transfer, Practice Effect, publication bias, spatial ability, video games and iq

Does Chess Raise Your IQ?

Mind & Everyday Life

Does Chess Raise Your IQ? What the Research Actually Shows

Chess is one of the oldest test cases for a big question: does practicing a demanding mental skill make you generally smarter, or just better at that skill? The honest summary from decades of research: real for chess itself, modest for a couple of related skills, and close to zero for general IQ.

Bar chart comparing chess training study results, showing a moderate effect on general cognitive ability in studies with no active control group, shrinking to near zero in the better-designed studies that used one

No, not in the way most people hope. Chess reliably makes you better at chess, and with enough structured instruction it appears to help a little with school subjects that lean on planning and working memory, particularly math. The evidence that it raises general intelligence — the kind an IQ test measures — is much weaker, and it gets weaker still in the studies built to rule out the obvious alternative explanations. That gap between the two claims is worth understanding rather than just accepting, because the same pattern — a confident headline about “raising IQ” resting on evidence that only ever supported a narrower, less exciting claim — shows up across most of the games, apps and hobbies marketed the same way.

That pattern — a real effect on the skill itself, a smaller and shakier one on anything further away — shows up again almost exactly with video games, which this article treats as a companion piece. Both are examples of the same question asked about a different activity: does deliberately practicing a demanding mental skill make you smarter overall, or just better at that skill?

What the raw numbers show

Pooling roughly forty studies of children given structured chess instruction, one widely cited analysis reported a moderate association with general cognitive-ability scores, and a similar or slightly larger one with math achievement specifically. Reading and literacy scores moved less. On the numbers alone, chess looks like a genuinely useful classroom activity.

Two details in the same body of research matter before taking that at face value. The size of the effect tracked how much chess the children actually did: benefits showed up reliably only once a class had logged somewhere around 25 to 30 hours of instruction, roughly a school year of one lesson a week. And the authors of the underlying review were explicit that no single study in it used what they considered an ideal design, so a placebo-like effect from novelty and extra adult attention could not be ruled out. That is not a small caveat in a literature this size: it means the best-supported number available is also, by the reviewers’ own account, an upper bound rather than a settled estimate.

Why the number shrinks when you look closer

That second caveat turned out to matter a great deal. Most of the early chess-and-cognition studies compared a chess class against doing nothing different at all, which leaves the comparison unable to separate three things that all point the same direction: chess itself, structured attention from an instructor, and simply doing something new and engaging instead of a normal lesson.

The same research group later re-ran the comparison using only studies where the control group did a different structured activity of their own, rather than nothing. Their own paper described the result in its title: negative evidence for far transfer. Once novelty and extra attention are matched on both sides, the boost to general cognitive ability mostly is not there. What survives is much closer to zero than the raw 0.34 figure above suggests.

Bar chart comparing chess training study results, showing a moderate effect on general cognitive ability in studies with no active control group, shrinking to near zero in the better-designed studies that used one
Bar chart comparing chess training study results, showing a moderate effect on general cognitive ability in studies with no active control group, shrinking to near zero in the better-designed studies that used one

Are strong players just smart people who chose chess

There is a second, separate question hiding inside the first one: are the best chess players in the world unusually high in IQ to begin with? Loosely, yes — competitive players as a group score above the general population average on cognitive tests, the way people who stick with any demanding hobby tend to skew toward whatever trait makes that hobby rewarding. But among players who already compete seriously, differences in tournament rating track hours of deliberate, structured study far more closely than they track differences in general intelligence scores. Two players with similar ratings can differ substantially in IQ, and two players with similar IQs can differ by hundreds of rating points depending on how they trained.

That is worth remembering the next time a very strong player’s IQ gets quoted as though it explained their rating. Magnus Carlsen and Garry Kasparov are both, by any measure, exceptionally strong players; neither’s rating is well explained by IQ alone, and both logged the kind of practice hours this research keeps landing on as the real driver.

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Chess, bridge and dementia risk in later life

A related and often-repeated claim is that chess and similar games protect older adults against cognitive decline and dementia. The observational evidence pointing that way is real: large studies following older adults over years have found that people who regularly play chess, cards or similar strategy games show a lower rate of later dementia diagnosis than people who do not.

The catch is a familiar one in this kind of research. Dementia has a long preclinical phase, often many years, during which subtle cognitive changes can make demanding hobbies less appealing well before any diagnosis is made. People already, invisibly, on the path to decline may simply stop playing chess first, which would produce exactly this pattern even if chess itself did nothing protective at all. Randomized trials, which could rule that out, are far smaller and shorter than the observational studies, and the question has not been settled either way.

What chess is actually good evidence for

Set the far-transfer question aside and the chess research is genuinely informative about something else: what deliberate practice does to the skill it targets, and how narrowly that tends to stay put. One of the more careful studies in this literature found chess instruction improved children’s meta-cognitive habits inside math problem-solving specifically — noticing when a plan is not working, checking an answer against the question — without a matching jump in general test scores. That is near transfer: chess did not make the children smarter in general, it made them better at monitoring their own thinking while doing something chess-like, and that skill did not travel very far past the domain it was trained in.

That study used an active control group of its own — children who received extra math instruction instead of chess — and still found the chess group ahead on the meta-cognitive measure, which is a more convincing design than most of the literature behind it. It is also a good example of what a believable transfer claim looks like: specific, modest, and tied to a plausible shared mechanism, rather than a blanket “chess makes children smarter.”

  • Real, and well supported. Chess makes you better at chess, and rating gains track practice hours closely.
  • Plausible, and modest. A year or more of regular instruction may help planning-heavy schoolwork a little, mainly math.
  • Not well supported once studies control for novelty. A durable boost to general intelligence.

So should you play chess for a smarter brain

If the goal is a higher IQ score, the honest answer is that chess is not a reliable way to get one, and probably no single hobby is; see how much of IQ is fixed versus changeable for the wider picture and what the evidence says actually moves the number. If the goal is a genuinely absorbing game that rewards planning, pattern recognition and calm decision-making under pressure, none of the transfer research changes that case at all — it only argues against expecting it to do something else on the side.

The more general lesson travels well beyond chess. Any claim that a specific game, app or hobby raises IQ deserves the same two questions asked here: what did the comparison group do, and how much of the reported effect survives once that comparison is fair? Retesting itself raises scores for reasons that have nothing to do with getting smarter, which is one more way an easy-looking result can mislead.

None of that is a reason to skip chess. It is a reason to want it for what it reliably gives you — a demanding, endlessly replayable game, not a training program with a guaranteed side effect on a test score you will take somewhere else entirely.

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Tagged active control group, chess and iq, cognitive training, deliberate practice, far transfer, how to increase iq, Improving IQ Scores, intelligence test, IQ Science, nature vs nurture, near transfer, Practice Effect, publication bias, replication crisis