Claude Sonnet 4.5 Nano on GPQA Diamond: score, rank and what it means
Claude Sonnet 4.5 Nano scores 68.9 on GPQA Diamond, placing it #298 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 Sonnet 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 Sonnet 4.5 Nano sits at #298 of 600. The leader, GPT-5.2 Reasoning, scores 87.0, so the gap to the top is 18.1 points. The median model in this index scores 68.8, which puts Claude Sonnet 4.5 Nano above the midpoint.
Anthropic models average 77.3 on this benchmark. Claude Sonnet 4.5 Nano is 8.4 points below that provider line, so it is a weaker result than the average Anthropic model.
Among mid-range models, the average is 62.9. Claude Sonnet 4.5 Nano is 6.0 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 68.9 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 $8.93 per million input tokens, Claude Sonnet 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 |
|---|---|---|---|---|
| Grok 4 Nano | xAI | 16384 | $8.97 | 72.7 |
| Llama 3 DeepInfra Chat | DeepInfra | 200000 | $3.74 | 75.0 |
| Nova Lite Reasoning | Amazon | 32768 | $9.92 | 74.3 |
| Yi-Large Chat | 01.AI | 65536 | $3.49 | 73.5 |
| Claude Sonnet 4.5 Nano | Anthropic | 8192 | $8.93 | 72.0 |
| Nemotron 4 Base | NVIDIA | 8192 | $3.29 | 73.0 |
| Auto Pro | OpenRouter | 8192 | $8.41 | 71.2 |
Other benchmarks for Claude Sonnet 4.5 Nano
| Benchmark | Score | Rank | Percentile | Relative |
|---|---|---|---|---|
| MMLU-Pro | 77.3 | 268 | 55th | |
| SWE-bench Verified | 61.2 | 295 | 51th | |
| HumanEval | 74.8 | 345 | 43th | |
| MATH-500 | 73.1 | 355 | 41th | |
| AIME 2025 | 64.2 | 353 | 41th | |
| LiveCodeBench | 61.2 | 359 | 40th | |
| IFEval | 82.2 | 269 | 55th | |
| TruthfulQA | 75.6 | 317 | 47th | |
| HellaSwag | 83.0 | 319 | 47th | |
| MMMU | 70.1 | 297 | 51th | |
| Arena Elo | 1364.3 | 334 | 44th |
FAQ
What score does Claude Sonnet 4.5 Nano get on GPQA Diamond?
Claude Sonnet 4.5 Nano scores 68.9 on GPQA Diamond in this index. The benchmark average is 65.6 and the top score is 87.0.
How does Claude Sonnet 4.5 Nano rank on GPQA Diamond?
It ranks #298 of 600 models, in the 50th percentile. The leader is GPT-5.2 Reasoning at 87.0.
Is Claude Sonnet 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 Sonnet 4.5 Nano cost?
Claude Sonnet 4.5 Nano costs $8.93 per million input tokens and $36.88 per million output tokens.