GPT-5.1 Max on GPQA Diamond: score, rank and what it means
GPT-5.1 Max scores 86.4 on GPQA Diamond, placing it #2 of 600 models in the index. The benchmark average is 65.6 and the leader is GPT-5.2 Reasoning at 87.0.
Score distribution
The chart shows the top 10 models on GPQA Diamond, with GPT-5.1 Max highlighted. Longer bars mean higher scores.
Top 10 leaderboard
| # | Model | Provider | Context | Input / 1M | Avg score |
|---|---|---|---|---|---|
| 1 | GPT-5.2 Reasoning | OpenAI | 1000000 | $20.98 | 87.5 |
| 2 | GPT-5.1 Max | OpenAI | 2000000 | $20.50 | 87.9 |
| 3 | Claude Opus 4.5 Pro | Anthropic | 200000 | $20.98 | 89.1 |
| 4 | GPT-5.1 Reasoning | OpenAI | 400000 | $20.27 | 88.3 |
| 5 | Claude Sonnet 4.5 Reasoning | Anthropic | 400000 | $19.48 | 87.7 |
| 6 | GPT-5.2 | OpenAI | 2000000 | $19.71 | 88.0 |
| 7 | o4 Turbo | OpenAI | 2000000 | $19.34 | 86.6 |
| 8 | Claude Opus 4.5 Max | Anthropic | 1000000 | $20.90 | 87.8 |
| 9 | Grok 4 Turbo | xAI | 1000000 | $19.21 | 86.7 |
| 10 | Claude Sonnet 4.5 Max | Anthropic | 1000000 | $19.90 | 87.2 |
What this score means
On GPQA Diamond, GPT-5.1 Max sits at #2 of 600. The leader, GPT-5.2 Reasoning, scores 87.0, so the gap to the top is 0.6 points. The median model in this index scores 68.8, which puts GPT-5.1 Max above the midpoint.
OpenAI models average 78.4 on this benchmark. GPT-5.1 Max is 8.0 points above that provider line, so it is a stronger result than the average OpenAI model.
Among frontier models, the average is 81.5. GPT-5.1 Max is 4.9 points above that group. This is the more useful comparison if you are shortlisting within the same tier rather than across the whole index.
Read a 86.4 as a relative signal, not an absolute guarantee. Benchmark scores depend on prompt format, evaluation harness and contamination controls. Use this page to narrow the shortlist, then test the model on your own data.
Price context
At $20.50 per million input tokens, GPT-5.1 Max is above the median input price of $4.00 across the 600 models scored on GPQA Diamond. The models immediately around it in the ranking are shown below so you can compare score and price together.
| Model | Provider | Context | Input / 1M | Avg score |
|---|---|---|---|---|
| GPT-5.2 Reasoning | OpenAI | 1000000 | $20.98 | 87.5 |
| GPT-5.1 Max | OpenAI | 2000000 | $20.50 | 87.9 |
| Claude Opus 4.5 Pro | Anthropic | 200000 | $20.98 | 89.1 |
| GPT-5.1 Reasoning | OpenAI | 400000 | $20.27 | 88.3 |
| Claude Sonnet 4.5 Reasoning | Anthropic | 400000 | $19.48 | 87.7 |
| GPT-5.2 | OpenAI | 2000000 | $19.71 | 88.0 |
Other benchmarks for GPT-5.1 Max
| Benchmark | Score | Rank | Percentile | Relative |
|---|---|---|---|---|
| MMLU-Pro | 91.3 | 2 | 100th | |
| SWE-bench Verified | 75.6 | 33 | 95th | |
| HumanEval | 92.2 | 18 | 97th | |
| MATH-500 | 91.3 | 35 | 94th | |
| AIME 2025 | 88.8 | 11 | 98th | |
| LiveCodeBench | 80.2 | 41 | 93th | |
| IFEval | 92.2 | 35 | 94th | |
| TruthfulQA | 91.1 | 1 | 100th | |
| HellaSwag | 93.1 | 21 | 97th | |
| MMMU | 85.1 | 5 | 99th | |
| Arena Elo | 1478.2 | 22 | 96th |
FAQ
What score does GPT-5.1 Max get on GPQA Diamond?
GPT-5.1 Max scores 86.4 on GPQA Diamond in this index. The benchmark average is 65.6 and the top score is 87.0.
How does GPT-5.1 Max rank on GPQA Diamond?
It ranks #2 of 600 models, in the 100th percentile. The leader is GPT-5.2 Reasoning at 87.0.
Is GPT-5.1 Max good at GPQA Diamond?
Yes, relative to the index: it is above the median and inside the top half of scores. The result should be read alongside its price and context window.
How is the GPQA Diamond score calculated?
GPQA Diamond is a reasoning benchmark. Scores in this index are modelled estimates on a 0–100 scale (or Elo for Arena), derived from capability tier and benchmark difficulty. They are not official leaderboard results.
What does GPT-5.1 Max cost?
GPT-5.1 Max costs $20.50 per million input tokens and $103.98 per million output tokens.