Claude Opus 4.5 Nano on GPQA Diamond: score, rank and what it means
Claude Opus 4.5 Nano scores 69.4 on GPQA Diamond, placing it #281 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 Claude Opus 4.5 Nano 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, Claude Opus 4.5 Nano sits at #281 of 600. The leader, GPT-5.2 Reasoning, scores 87.0, so the gap to the top is 17.6 points. The median model in this index scores 68.8, which puts Claude Opus 4.5 Nano above the midpoint.
Anthropic models average 77.3 on this benchmark. Claude Opus 4.5 Nano is 7.9 points below that provider line, so it is a weaker result than the average Anthropic model.
Among multimodal models, the average is 73.5. Claude Opus 4.5 Nano is 4.1 points below that group. This is the more useful comparison if you are shortlisting within the same tier rather than across the whole index.
Read a 69.4 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 $9.38 per million input tokens, Claude Opus 4.5 Nano 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 |
|---|---|---|---|---|
| Seed-OSS Chat | ByteDance | 65536 | $3.49 | 74.4 |
| Claude Sonnet 4.5 Mini | Anthropic | 32768 | $11.43 | 76.5 |
| Mixtral Turbo | Together AI | 65536 | $3.20 | 72.4 |
| Auto Max | OpenRouter | 8192 | $8.41 | 71.2 |
| Claude Opus 4.5 Nano | Anthropic | 32768 | $9.38 | 73.3 |
| Gemini 3 Pro Nano | Google DeepMind | 8192 | $9.11 | 73.2 |
| Nemotron 4 Chat | NVIDIA | 65536 | $3.99 | 75.0 |
Other benchmarks for Claude Opus 4.5 Nano
| Benchmark | Score | Rank | Percentile | Relative |
|---|---|---|---|---|
| MMLU-Pro | 76.1 | 300 | 50th | |
| SWE-bench Verified | 62.2 | 273 | 55th | |
| HumanEval | 75.5 | 334 | 44th | |
| MATH-500 | 77.2 | 272 | 55th | |
| AIME 2025 | 71.4 | 229 | 62th | |
| LiveCodeBench | 65.0 | 293 | 51th | |
| IFEval | 79.7 | 337 | 44th | |
| TruthfulQA | 78.1 | 252 | 58th | |
| HellaSwag | 82.1 | 344 | 43th | |
| MMMU | 69.2 | 322 | 46th | |
| Arena Elo | 1373.3 | 305 | 49th |
FAQ
What score does Claude Opus 4.5 Nano get on GPQA Diamond?
Claude Opus 4.5 Nano scores 69.4 on GPQA Diamond in this index. The benchmark average is 65.6 and the top score is 87.0.
How does Claude Opus 4.5 Nano rank on GPQA Diamond?
It ranks #281 of 600 models, in the 53rd percentile. The leader is GPT-5.2 Reasoning at 87.0.
Is Claude Opus 4.5 Nano 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 Claude Opus 4.5 Nano cost?
Claude Opus 4.5 Nano costs $9.38 per million input tokens and $36.06 per million output tokens.