USAMO 2026
Models write full proofs for the six problems of the 2026 USA Mathematical Olympiad. Judges grade each proof from 0 to 7 against rubrics.
MathArena reports GPT-5.4 at 95.2% and says it essentially saturates the benchmark.
- Level
- Competition The strongest students, in olympiad-style contests
- Scored
- Graded by people Human experts grade or compare the outputs.
- Answers
- Written proof
GPT-5.5 leads with 98.2% among models released by Apr 2026
Best score per model from the benchmark's own leaderboard, read on 2 Nov 2026. Where a model ran with several settings or harnesses, we keep its best. Every run is in the next chart.
The newest model with a score here came out in Apr 2026, and nobody has tested a newer one. Among the 20 highest-ranked models on the capability index, these have no score yet:
- GPT-6 Astra
- Claude Opus 5.5
- GPT-6.1 Terra
- GPT-6.1 Sol
- and 15 more
- 1 GPT-5.5 xhigh 98.2%
- 2 GPT-5.4 xhigh 95.2%
- 3
Gemini 3.1 Pro 74.4% - 4
DeepSeek-V4-Pro max 60.7% - 5 Kimi K2.6 thinking 51.2%
- 6 Claude Opus 4.6 high 47%
- 7
Step 3.5 Flash 44.6% - 8
Qwen3.5 397B-A17B 36.3% - 9 GLM-5 35.1%
| # | Model | Score | Setting | Date | Source |
|---|---|---|---|---|---|
| 1 | GPT-5.5 | 98.2% | xhigh | Apr 2026 | Official leaderboard |
| 2 | GPT-5.4 | 95.2% | xhigh | Mar 2026 | Official leaderboard |
| 3 | Gemini 3.1 Pro | 74.4% | Feb 2026 | Official leaderboard | |
| 4 | DeepSeek-V4-Pro | 60.7% | max | Apr 2026 | Official leaderboard |
| 5 | Kimi K2.6 | 51.2% | thinking | Apr 2026 | Official leaderboard |
| 6 | Claude Opus 4.6 | 47% | high | Feb 2026 | Official leaderboard |
| 7 | Step 3.5 Flash | 44.6% | Feb 2026 | Official leaderboard | |
| 8 | Qwen3.5 397B-A17B | 36.3% | Feb 2026 | Official leaderboard | |
| 9 | GLM-5 | 35.1% | Feb 2026 | Official leaderboard |
Labs report scores for 6 models in their cards. We plot every source in the charts below.
The best score, 98.2%, costs $0.79 a task
Runs on the cost frontier score higher than any run that's cheaper. The costs are the leaderboard's own estimates, so compare them only within this benchmark.
| Model | Effort | Harness | Score | Cost per task | Output tokens |
|---|---|---|---|---|---|
| GPT-5.5 | xhigh | 98.2% | $0.79 | 26,399 | |
| GPT-5.4 | xhigh | 95.2% | $0.86 | 56,878 | |
| Gemini 3.1 Pro | 74.4% | $0.37 | 30,598 | ||
| DeepSeek-V4-Pro | max | 60.7% | $0.50 | 143,526 | |
| Kimi K2.6 | thinking | 51.2% | $0.25 | 63,178 | |
| Claude Opus 4.6 | high | 47% | $2.21 | 87,828 | |
| Step 3.5 Flash | 44.6% | $0.04 | 124,206 | ||
| Qwen3.5 397B-A17B | 36.3% | $0.12 | 33,356 | ||
| GLM-5 | 35.1% | $0.24 | 76,404 |
3 models have held number one since its release in Mar 2026
Lab claims count from the day the card came out, independent runs from the model’s release. We draw one row each for the benchmark’s own leaderboard and what labs claim in their cards.
The best score passed 85% in Mar 2026
All the scores we have, one dot each, so a model tested at several settings appears more than once.
2 labs put it in a launch post in the last six months
Launch posts from every lab that has listed it, one tick per post. Tall colored ticks include it, and short gray ones leave it out.
| Date | Launch post | Score | As the post writes it |
|---|---|---|---|
| 2 Jul 2026 |  Tencent Hy3 | 72 | USAMO 2026 |
| 1 Jun 2026 |  MiniMax-M3 | 36 | USAMO 2026 |
| 7 Apr 2026 | Claude Mythos Preview | 97.6 | USAMO 2026 |
5 system cards report it, from 2 labs
Besides launch posts, we read the system cards, model cards and technical reports labs publish with a release. They report far more, including safety and frontier-risk tests.
| Date | Document | Score | As the document writes it | Section |
|---|---|---|---|---|
| 30 Jun 2026 | Claude Sonnet 5 system card | 79.5 | USAMO 2026, high effort, 300k token limit, average over 10 attempts per problem, MathArena-style grading (8.6) | Capabilities |
| 9 Jun 2026 |  Nemotron 3 Ultra technical report | 97.6 | USAMO 2026, 41/42, generate-verify-refine test-time scaling, human graded (Table 11) | Capabilities |
| 28 May 2026 | Claude Opus 4.8 system card | 96.7 | USAMO 2026, MathArena grading with the minimum of three judges, high effort, 300k token limit, 10 attempts per problem (8.7) | Capabilities |
| 16 Apr 2026 | Claude Opus 4.7 system card | 69.3 | USAMO 2026, MathArena grading, medium effort, 300k token limit, average of 10 attempts per problem (8.6) | Capabilities |
| 7 Apr 2026 | Claude Mythos Preview system card | 97.6 | USAMO 2026, max effort, no tools, 10 trials per problem, MathArena grading with the minimum of 3 judges (Table 6.3.A, 6.8) | Capabilities |
Versions
We switch the top row to each new version when it comes out. Open it for one row per version. An old version stays in play while people still test it, so whoever first takes it past 85% gets credit for closing it out.
More in Math
- IMO-AnswerBench In use 400 olympiad problems with short verifiable answers, robustified against memorization. Scored by answer match. GLM-5.2 91%
- AIME 2026 In use Models solve the 30 integer-answer problems from the 2026 AIME I and II math competitions. Scored by exact answer match. GPT-5.5 100%
- HMMT 2026 In use Models solve the 33 final-answer problems from the February 2026 Harvard-MIT Mathematics Tournament. Scored by exact answer match. GPT-5.5 98.5%
- MathArena (Apex, IMO, USAMO) In use Evaluates models on newly released math competitions after release. Final-answer or human/LLM-judged proof scores. Claude Opus 4.8 81.3%
- PolyMath In use Models solve 9,000 parallel math problems in 18 languages across four difficulty levels, from school math to frontier math. Final answers are checked. Qwen3.7-Max 86.5%
- ArXivMath In use Final-answer research-level math problems extracted monthly from recent arXiv papers and filtered to be self-contained. GPT-6.1 Sol 94.2%