Claude Sonnet 4.5 Nano on Arena Elo: score, rank and what it means
Claude Sonnet 4.5 Nano scores 1364.3 on Arena Elo, placing it #334 of 600 models in the index. The benchmark average is 1349.9 and the leader is Claude Opus 4.5 Max at 1501.9.
Score distribution
The chart shows the top 10 models on Arena Elo, with Claude Sonnet 4.5 Nano highlighted. Longer bars mean higher scores.
Top 10 leaderboard
| # | Model | Provider | Context | Input / 1M | Avg score |
|---|---|---|---|---|---|
| 1 | Claude Opus 4.5 Max | Anthropic | 1000000 | $20.90 | 87.8 |
| 2 | GPT-5.2 Reasoning | OpenAI | 1000000 | $20.98 | 87.5 |
| 3 | GPT-5.2 Turbo | OpenAI | 1000000 | $20.73 | 87.4 |
| 4 | Claude Opus 4.5 Reasoning | Anthropic | 2000000 | $20.91 | 88.2 |
| 5 | GPT-5.2 Max | OpenAI | 1000000 | $21.39 | 89.2 |
| 6 | Gemini 3 Pro Turbo | Google DeepMind | 400000 | $19.62 | 86.4 |
| 7 | Grok 4 Max | xAI | 2000000 | $19.70 | 86.6 |
| 8 | Claude Opus 4.5 | Anthropic | 400000 | $19.42 | 87.7 |
| 9 | GPT-5.1 Pro | OpenAI | 200000 | $19.77 | 87.8 |
| 10 | Grok 4 Reasoning | xAI | 2000000 | $19.67 | 87.8 |
What this score means
On Arena Elo, Claude Sonnet 4.5 Nano sits at #334 of 600. The leader, Claude Opus 4.5 Max, scores 1501.9, so the gap to the top is 137.6 points. The median model in this index scores 1373.8, which puts Claude Sonnet 4.5 Nano below the midpoint.
Anthropic models average 1437.5 on this benchmark. Claude Sonnet 4.5 Nano is 73.2 points below that provider line, so it is a weaker result than the average Anthropic model.
Among mid-range models, the average is 1332.0. Claude Sonnet 4.5 Nano is 32.3 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 1364.3 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 Arena Elo. 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 |
|---|---|---|---|---|
| OLMo 2 Chat | Allen Institute for AI | 16384 | $2.94 | 70.6 |
| Auto Max | OpenRouter | 8192 | $8.41 | 71.2 |
| Firesearch Reasoning | Fireworks AI | 32768 | $7.74 | 69.0 |
| Nemotron 4 Base | NVIDIA | 8192 | $3.29 | 73.0 |
| Claude Sonnet 4.5 Nano | Anthropic | 8192 | $8.93 | 72.0 |
| Mixtral Turbo | Together AI | 65536 | $3.20 | 72.4 |
| Llama 3 Modal Base | Modal | 16384 | $3.21 | 72.2 |
Other benchmarks for Claude Sonnet 4.5 Nano
| Benchmark | Score | Rank | Percentile | Relative |
|---|---|---|---|---|
| MMLU-Pro | 77.3 | 268 | 55th | |
| GPQA Diamond | 68.9 | 298 | 50th | |
| 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 |
FAQ
What score does Claude Sonnet 4.5 Nano get on Arena Elo?
Claude Sonnet 4.5 Nano scores 1364.3 on Arena Elo in this index. The benchmark average is 1349.9 and the top score is 1501.9.
How does Claude Sonnet 4.5 Nano rank on Arena Elo?
It ranks #334 of 600 models, in the 44th percentile. The leader is Claude Opus 4.5 Max at 1501.9.
Is Claude Sonnet 4.5 Nano good at Arena Elo?
It is below the median for this benchmark, so test it carefully before relying on it for this capability. The result should be read alongside its price and context window.
How is the Arena Elo score calculated?
Arena Elo is a preference 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.