USAMO 2026
USA Mathematical Olympiad 2026, proof-graded by MathArena. Shown for reference; too few models, too close to the ceiling.
As of 21 Oct 2026, GPT-5.5 leads USAMO 2026 on BenchLeader with 98.2%, ahead of GPT-5.4 at 95.2%, across 9 model configurations with a published result.
MathArena marks 3 of these 9 results as possibly contaminated: the model was evaluated after the questions were public, so they may already be in its training data. Those scores are in the table below; this board does not feed the index.
- Published by
- MathArena
- Category
- Maths
- Index weight
- Reference only
- Models
- 9
- Data as of
- 21 Oct 2026
MIT — eth-sri/matharena.
- 1GPT-5.5 (xhigh)98.2%
- 2GPT-5.4 (xhigh)95.2%
- 3Gemini 3.1 Pro74.4%
- 4DeepSeek V4 Pro (max)60.7%
- 5Kimi K2.6 (thinking)51.2%
- 6Claude Opus 4.6 (high)47.0%
- 7Step 3.5 Flash44.6%
- 8Qwen3.5 397B A17B36.3%
- 9GLM-535.1%
9 of 9
| # | ||||
|---|---|---|---|---|
| 1 |  GPT-5.5xhigh | 98.2% | 66.1 | possible |
| 2 | GPT-5.4xhigh | 95.2% | 64.8 | – |
| 3 |  Gemini 3.1 Pro | 74.4% | 60.7 | – |
| 4 |  DeepSeek V4 Promaxopen ↗ | 60.7% | 60.8 | possible |
| 5 |  Kimi K2.6thinkingopen ↗ | 51.2% | 59.4 | possible |
| 6 |  Claude Opus 4.6high | 47.0% | 62.8 | – |
| 7 |  Step 3.5 Flashopen ↗ | 44.6% | 53.8 | – |
| 8 |  Qwen3.5 397B A17Bopen ↗ | 36.3% | 51.6 | – |
| 9 |  GLM-5open ↗ | 35.1% | 55.0 | – |
More maths benchmarks · All LLM benchmarks
Cite as: BenchLeader, “USAMO 2026 leaderboard”, https://www.benchleader.com/benchmarks/matharena_usamo_2026, data as of 21 Oct 2026.
USAMO 2026: questions
- What does USAMO 2026 measure?
- USA Mathematical Olympiad 2026, proof-graded by MathArena. Shown for reference; too few models, too close to the ceiling. Scores are reported in percent of tasks solved; higher is better.
- Which AI model leads USAMO 2026?
- GPT-5.5 leads USAMO 2026 with 98.2% as of 21 Oct 2026, ahead of GPT-5.4 at 95.2%.
- How many models have USAMO 2026 results?
- 9 model configurations have a USAMO 2026 result on BenchLeader, all taken from MathArena.
- Who runs USAMO 2026 and how often is it updated?
- USAMO 2026 is published by MathArena. BenchLeader re-reads the published results once a day and records the date each result was published.
- Does USAMO 2026 count toward the BenchLeader Index?
- No. USAMO 2026 is shown for reference but left out of the composite index.