IMO 2026: Traders Put 99% Odds on 5+ Perfect Scorers as Manifold Volume Spikes. A Manifold market asking whether at least five contestants will earn a flawless 42 out of 42 at the 2026 International Mathematical Olympiad jumped to about 99% implied probability of YES as of July 17, 2026, one day after the exams wrapped in Shanghai. Roughly 38% of the market’s all-time volume changed hands in the prior 24 hours, one of the sharpest one-day surges in the source. The trigger is timing: the competition is over, and the money is now pricing an outcome that recent history has made look close to routine.
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What the market is asking
The contract in question is “5+ perfect scorers at IMO 2026?” on Manifold, a play-money prediction platform where users trade shares that pay out based on whether an event resolves YES or NO. A “perfect score” at the IMO means 42 out of 42 points, earned by fully solving all six proof-based problems across the two exam days, with each problem worth a maximum of seven points.
The 67th International Mathematical Olympiad is being held in Shanghai, China, from July 10 to 21, 2026, according to the official IMO site. The two exam papers were sat on July 15 and July 16. That schedule is the key to the market’s timing: with the papers written and scoring underway, the question is no longer “how hard will the exam be” but “how many students cleared every problem.” If you are new to how these contracts move, our primer on how prediction markets work explains the mechanics.
The odds, and what 99% implies
As of July 17, 2026, Manifold priced YES on the “5+ perfect scorers” question at roughly 99%. In prediction-market terms, a 99% price is the crowd saying the outcome is close to a settled fact, with only a sliver of doubt left. For readers who want the mechanics behind that translation, see our explainer on implied probability.
A price that high leaves almost no expected profit for new YES buyers and heavy downside for anyone shorting it, which is exactly why the interesting signal here is volume rather than level. When about 38% of a market’s entire trading history prints in a single day and pushes the line to near-certainty, it usually means fresh information has arrived and traders are racing to close out uncertainty. On Manifold that information is not a wire report; it is the simple fact that the exam is finished and the range of plausible outcomes has collapsed.
What is driving the sudden move
We cannot yet verify the actual number of perfect scorers, because official IMO 2026 individual results had not been published as of July 17, 2026. The competition window runs through July 21, and coordination, the process where exam papers are scored and disputes resolved, typically finalizes over the following days. So the honest framing is that this market is pricing an expectation, not a confirmed count.
The most-supported explanation for the surge is straightforward and does not require any leaked result. First, the exams concluded on July 16, which removes the biggest source of uncertainty and lets traders commit capital. Second, the base rate has shifted hard in favor of “5+” in recent years. The 2025 edition produced five perfect scorers, the largest number since 2001, and the gold-medal cutoff of 35 points was reported as the highest in the event’s history, per coverage of the official 2025 results. When the immediately preceding year already hit the exact threshold this market asks about, a jump to 99% is less a leap of faith than an extrapolation.
We are not claiming the 2026 papers were unusually easy or that any specific count has leaked. Those claims are unverified. What is verifiable is that the exam is over and that recent IMOs have repeatedly cleared the five-perfect-score bar.
The AI question hanging over the market
There is a genuine ambiguity in this specific contract. In the market’s comment thread, a trader asks directly whether AI systems count toward the “perfect scorers” tally, and the discussion notes the resolution criteria are not spelled out. That matters, because the broader wave of IMO betting in 2026 is really a proxy for artificial-intelligence progress, not human contest results.
The human competition and the AI storyline are usually tracked as separate markets. A closely watched Manifold contract on whether any AI model will hit a flawless 42 out of 42 at IMO 2026 has traded near the top of its range for weeks, a move we covered when those odds reached 96% and earlier when Manifold put the AI perfect score at 91%. The “5+ perfect scorers” question reads most naturally as a human-contestant count, in line with the historical statistics the IMO publishes, but the unresolved AI wrinkle is part of why the contract drew a crowd. Prediction markets reward disambiguation, and an under-specified question near resolution tends to attract both confident YES buyers and traders probing the edge cases.
The recent track record: why 5+ looks like a safe bet
The reason a 99% price does not look reckless is the run of high-scoring Olympiads. The table below lists recent-year perfect-score counts as recorded by imo-official.org, alongside the 2026 market status.
| Year | Host | Perfect scorers (42/42) | Notes |
|---|---|---|---|
| 2022 | Oslo, Norway | 10 | Unusually high count |
| 2023 | Chiba, Japan | 5 | Cleared the “5+” bar |
| 2024 | Bath, United Kingdom | 1 | Below the bar |
| 2025 | Sunshine Coast, Australia | 5 | Most since 2001; record 35-point gold cutoff |
| 2026 | Shanghai, China | Pending official results | Manifold prices 5+ at ~99% (July 17, 2026) |
Three of the four most recent editions met or beat five perfect scores. Only 2024 fell short, with a single perfect paper. Against that backdrop, a market betting on “5 or more” is leaning on a base rate that has trended in its favor, which is precisely the kind of setup that pushes a contract toward the high 90s once the last live variable, the exam itself, is removed.
Who and what is involved
The IMO is the oldest of the international science olympiads, drawing roughly 600-plus pre-university students from more than 100 countries each year. The 2025 edition in Australia fielded 630 contestants from 110 countries, with China regaining the top team spot on 231 points, ahead of the United States on 216 and South Korea on 203. Those totals frame how tight the top of the field has become, and why several students now routinely reach the ceiling.
On the AI side, the names driving the wider IMO betting are the frontier labs. In July 2025, Google DeepMind reported that an advanced version of Gemini with Deep Think officially reached gold-medal standard on the 2025 IMO problems, solving five of six for 35 points, and an experimental OpenAI model reported a comparable result. In December 2025, DeepSeek released Math-V2, described by the South China Morning Post as the first open-weight model to reach IMO gold level. Manifold itself is the venue here; for how it compares with regulated and cash-settled platforms, see our breakdown of Kalshi versus Polymarket.
Why a tech and finance reader should care
Two threads make this more than a math-contest curiosity. The first is that prediction markets are increasingly used as real-time sentiment gauges for events with no traditional odds line, from central-bank decisions to product launches to, now, elite academic competitions. A one-day volume spike to 38% of all-time turnover is the kind of microstructure signal that traders watch for across markets, because it flags where conviction and fresh information are concentrating.
The second is the AI overlay. The reason IMO contracts trade at all in 2026 is that the competition has become a public benchmark for machine reasoning. When frontier labs treat a high-school proof exam as a milestone, the surrounding betting turns into a low-stakes barometer of how fast that capability is moving. The human “5+ perfect scorers” market and the AI “perfect score” markets are technically distinct, but they draw the same audience for the same reason: the IMO is one of the few places where human and machine performance can be scored on an identical, unforgiving rubric.
What to watch next
The resolving event is the publication of official IMO 2026 individual results, expected in the days following the July 21 close of the competition window on imo-official.org. Once the coordinated scores are posted, the perfect-score count is a matter of record and the market settles. Three things are worth tracking until then: whether the final count clears five, which would validate the crowd; how the market’s author defines “perfect scorers” if the AI question forces a ruling; and whether the separate AI-perfect-score contracts resolve in the same cycle, since any verified 42 out of 42 from a lab would be a far larger story than the human tally. Traders who want to follow the money can compare venues in our platform comparison and read the mechanics again in the prediction-market primer.
Frequently asked questions
What does “5+ perfect scorers” mean? It asks whether at least five IMO 2026 contestants score a full 42 out of 42 points by solving all six problems completely. The market resolves YES if five or more reach that mark.
Have the results been announced? Not as of July 17, 2026. The exams were sat on July 15 and 16 in Shanghai, and official individual results were still pending. The 99% price reflects expectation, not a confirmed count.
Do AI models count toward the tally? The market’s resolution criteria are not explicitly spelled out, and a trader raised exactly this question in the comments. Read literally against IMO statistics, it points to human contestants, but the ambiguity is unresolved.
Why did volume spike now? The exams concluded on July 16, which removed the main source of uncertainty. With recent editions frequently exceeding five perfect scores, traders pushed the contract toward near-certainty as the outcome window narrowed.
Is this the same as the AI perfect-score markets? No. Separate Manifold contracts ask whether an AI model will hit 42 out of 42 at IMO 2026. Those are distinct questions, though they share an audience.
The Bottom Line
Sources
- Manifold — 5+ perfect scorers at IMO 2026?
- International Mathematical Olympiad — IMO 2026 (Shanghai)
- International Mathematical Olympiad — 2025 individual results
- Google DeepMind — Gemini with Deep Think achieves IMO gold-medal standard
- South China Morning Post — DeepSeek releases first open AI model with gold-level IMO scores
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