Claude Opus 4.5 Nano on AIME 2025: score, rank and what it means
Claude Opus 4.5 Nano scores 71.4 on AIME 2025, placing it #229 of 600 models in the index. The benchmark average is 63.6 and the leader is Claude Opus 4.5 Pro at 91.4.
Score distribution
The chart shows the top 10 models on AIME 2025, with Claude Opus 4.5 Nano highlighted. Longer bars mean higher scores.
Top 10 leaderboard
| # | Model | Provider | Context | Input / 1M | Avg score |
|---|---|---|---|---|---|
| 1 | Claude Opus 4.5 Pro | Anthropic | 200000 | $20.98 | 89.1 |
| 2 | GPT-5.2 Pro | OpenAI | 2000000 | $21.32 | 89.6 |
| 3 | GPT-5.1 Pro | OpenAI | 200000 | $19.77 | 87.8 |
| 4 | GPT-5.2 | OpenAI | 2000000 | $19.71 | 88.0 |
| 5 | o4 Reasoning | OpenAI | 1000000 | $19.69 | 87.5 |
| 6 | o4 Pro | OpenAI | 1000000 | $19.37 | 87.3 |
| 7 | Claude Opus 4.5 | Anthropic | 400000 | $19.42 | 87.7 |
| 8 | Gemini 3 Pro Max | Google DeepMind | 2000000 | $20.57 | 87.9 |
| 9 | Claude Opus 4.5 Max | Anthropic | 1000000 | $20.90 | 87.8 |
| 10 | Claude Opus 4.5 Reasoning | Anthropic | 2000000 | $20.91 | 88.2 |
What this score means
On AIME 2025, Claude Opus 4.5 Nano sits at #229 of 600. The leader, Claude Opus 4.5 Pro, scores 91.4, so the gap to the top is 20.0 points. The median model in this index scores 67.6, which puts Claude Opus 4.5 Nano above the midpoint.
Anthropic models average 79.7 on this benchmark. Claude Opus 4.5 Nano is 8.3 points below that provider line, so it is a weaker result than the average Anthropic model.
Among multimodal models, the average is 73.9. Claude Opus 4.5 Nano is 2.5 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 71.4 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 AIME 2025. 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 |
|---|---|---|---|---|
| Yi-Lightning Instruct | 01.AI | 128000 | $4.16 | 76.5 |
| GPT-5.1 Mini | OpenAI | 128000 | $12.19 | 77.7 |
| Llama 3.3 Base | Meta AI | 32768 | $3.63 | 74.0 |
| Reka Flash Max | Reka AI | 32768 | $11.17 | 75.9 |
| Claude Opus 4.5 Nano | Anthropic | 32768 | $9.38 | 73.3 |
| Codestral | Mistral AI | 65536 | $4.19 | 77.6 |
| Firefunction Pro | Fireworks AI | 16384 | $9.05 | 72.9 |
Other benchmarks for Claude Opus 4.5 Nano
| Benchmark | Score | Rank | Percentile | Relative |
|---|---|---|---|---|
| MMLU-Pro | 76.1 | 300 | 50th | |
| GPQA Diamond | 69.4 | 281 | 53th | |
| SWE-bench Verified | 62.2 | 273 | 55th | |
| HumanEval | 75.5 | 334 | 44th | |
| MATH-500 | 77.2 | 272 | 55th | |
| 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 AIME 2025?
Claude Opus 4.5 Nano scores 71.4 on AIME 2025 in this index. The benchmark average is 63.6 and the top score is 91.4.
How does Claude Opus 4.5 Nano rank on AIME 2025?
It ranks #229 of 600 models, in the 62nd percentile. The leader is Claude Opus 4.5 Pro at 91.4.
Is Claude Opus 4.5 Nano good at AIME 2025?
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 AIME 2025 score calculated?
AIME 2025 is a mathematics 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.