Claude Sonnet 4.5 vs GPT-5 Nano
Head to head on 31 shared benchmarks, with price, context window, and release dates.
Benchmark scores
100evals · sort by any column, ⤢ to expand fullscreen
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| GPT-5 Nano OpenAI | 0.0% | 83.7% | 705elo | 28 | 8.3% | 67.6% | 9.5% | 67.6% | 52.8% | 62.4% | 43.4% | 55.7% | 46.8% | 68.4% | 40.3% | 78.9% | 1.38 | 1.38 | 30.4% | 72.9% | 78.0% | 53.6% | 0.0% | 0.0% | 12.0% | 30.4% | 36.6% | 34.8% | 67.4% | 12.1% | 36.5% | - | - | - | - | - | - | 0.25 | 0.21 | - | 6.7% | - | - | - | 10.0% | - | - | - | - | 78.2% | - | 1.18 | - | - | - | - | - | 100.0% | - | - | - | - | - | - | 100.0% | 100.0% | - | - | 26.7% | - | 100.0% | - | - | - | - | - | - | - | - | - | - | 1.72 | - | - | - | - | - | - | - | - | 29.7% | - | 20.41 | -6.67 | - | - | 82.0% | 82.0% | - | 40.0% | 48.9% |
| Claude Sonnet 4.5 Anthropic | 0.0% | 88.0% | 1678elo | 71.4 | 15.2% | 83.4% | 17.8% | 57.3% | 70.7% | 80.4% | 57.0% | 53.4% | 76.5% | 79.3% | 77.6% | 71.4% | 0.75 | 0.75 | 40.6% | 84.5% | 87.5% | 64.0% | 0.0% | 0.0% | 19.0% | 32.9% | 45.7% | 74.8% | 73.3% | 35.6% | 78.1% | 0.0% | 100 | 0.0% | 0.0% | 0.0% | 5.0% | - | - | 0.0% | - | 60.8% | 0.0% | 0.0% | - | 0.0% | 0.0% | 0.0% | 0.0% | - | 0.0% | - | 0.0% | 83.9% | 0.0% | 0.0% | 0.0% | - | 0.0% | 0.0% | 87.5% | 83.8% | 0.0% | 0.0% | - | - | 0.0% | 0 | - | 0 | - | 0.0% | 62.9% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0 | - | 0.0% | 0.0% | 77.2% | 67.0% | 0.0% | 0 | 0 | 50.34 | - | 0 | - | - | 22.6% | 0.0% | - | - | 1.49 | - | 29.2% |
2 / 2 models
| Attribute | Claude Sonnet 4.5 Anthropic | GPT-5 Nano OpenAI |
|---|---|---|
| Description | anthropic/claude-sonnet-4.5 is an AI model. | GPT-5 nano is an AI model from OpenAI. |
| Family | Claude | GPT |
| Params | Undisclosed (closed) | - |
| Open weights | closed | closed |
| License | proprietary | proprietary |
| Released | 29 Sep 2025 | 7 Aug 2025 |
| Context | 1,000,000 | 400,000 |
| Input $/1M | $3.00 | $0.05 |
| Output $/1M | $15.00 | $0.40 |
| Cache read $/1M | $0.300 | $0.005 |
| Cache write $/1M | $3.750 | - |
| Speed | 0 tok/s | 0 tok/s |
| Latency | 0.00 s | 0.00 s |
| Modalities | text, image, file | text, image, file |
| Providers | anthropic, aws-bedrock, vertex-ai | - |
| Publisher | Anthropic | OpenAI |
| Reported scores | TaxEval v273.3% LiveBench - Math79.3% (LiveBench) LiveBench - Coding80.4% (LiveBench) LiveBench - Language76.5% (LiveBench) LiveBench - Data Analysis57.0% (LiveBench) |
FAQ
- Is Claude Sonnet 4.5 or GPT-5 Nano better?
- Across the 31 benchmarks both models report on Sophon, Claude Sonnet 4.5 leads on 23 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
- How do Claude Sonnet 4.5 and GPT-5 Nano compare on GPQA Diamond?
- Claude Sonnet 4.5 scores 83.4% and GPT-5 Nano scores 67.6% on GPQA Diamond.
- Which is cheaper, Claude Sonnet 4.5 or GPT-5 Nano?
- GPT-5 Nano is cheaper at $0.40 per million output tokens against $15.00 for Claude Sonnet 4.5 - about 37.5x.
- When were Claude Sonnet 4.5 and GPT-5 Nano released?
- Claude Sonnet 4.5 was released 29 Sep 2025 by Anthropic. GPT-5 Nano was released 7 Aug 2025 by OpenAI.
Other head-to-heads
56GPT-5 Mini vs GPT-5 Nano38 shared evalsClaude Sonnet 4.5 vs GPT-4.1 Mini35 shared evalsClaude Opus 4.5 vs Claude Sonnet 4.534 shared evalsClaude Sonnet 4.5 vs GPT-5.232 shared evalsClaude Sonnet 4.5 vs GPT-5 Mini31 shared evalsClaude Sonnet 4.5 vs GPT-531 shared evalsClaude 4 Sonnet vs Claude Sonnet 4.528 shared evalsClaude Opus 4.6 vs Claude Sonnet 4.528 shared evalsClaude Sonnet 4.5 vs Kimi K2.528 shared evalsClaude Sonnet 4.5 vs Grok 4.1 Fast28 shared evalsGPT-5 vs GPT-5 Nano28 shared evalsClaude Sonnet 4.5 vs Gemini 3.1 Pro Preview27 shared evalsClaude Sonnet 4.5 vs DeepSeek V3.227 shared evalsGPT-4.1 Mini vs GPT-5 Nano26 shared evalsClaude Sonnet 4.5 vs GPT-5.526 shared evalsClaude Sonnet 4.5 vs GPT-5.426 shared evalsClaude Sonnet 4.5 vs Gemini 2.5 Pro26 shared evalsGPT-5 Nano vs GPT-5.226 shared evalsClaude Opus 4.5 vs GPT-5 Nano26 shared evalsClaude Opus 4.8 vs Claude Sonnet 4.525 shared evalsClaude Sonnet 4.5 vs GLM 4.725 shared evalsClaude 4 Sonnet vs GPT-5 Nano25 shared evalsClaude Fable 5 vs Claude Sonnet 4.524 shared evalsClaude Sonnet 4.5 vs Claude Sonnet 4.624 shared evalsClaude Opus 4.7 vs Claude Sonnet 4.524 shared evalsGemini 2.5 Pro vs GPT-5 Nano24 shared evalsGPT-5 Nano vs Grok 4.1 Fast24 shared evalsClaude Sonnet 4.5 vs GLM 5.123 shared evalsClaude Sonnet 4.5 vs gpt-oss-120b23 shared evalsClaude Sonnet 4.5 vs GPT-5.4 Mini23 shared evalsGPT-5 Nano vs GPT-5.523 shared evalsClaude Opus 4.6 vs GPT-5 Nano23 shared evalsGLM 4.7 vs GPT-5 Nano23 shared evalsClaude Sonnet 4.5 vs Qwen3.6 Plus22 shared evalsGemini 3.1 Pro Preview vs GPT-5 Nano22 shared evalsClaude Opus 4.8 vs GPT-5 Nano22 shared evalsGPT-5 Nano vs GPT-5.422 shared evalsGPT-5 Nano vs Kimi K2.522 shared evalsClaude Opus 4.7 vs GPT-5 Nano22 shared evalsDeepSeek V3.2 vs GPT-5 Nano22 shared evalsGPT-4.1 Nano vs GPT-5 Nano22 shared evalsGPT-5 Nano vs gpt-oss-120b22 shared evalsClaude Sonnet 4.5 vs GPT-4o21 shared evalsClaude Fable 5 vs GPT-5 Nano21 shared evalsGLM 5.1 vs GPT-5 Nano21 shared evalsGPT-4.1 vs GPT-5 Nano20 shared evalsClaude Sonnet 4.6 vs GPT-5 Nano20 shared evalsGPT-5.4 Mini vs GPT-5 Nano20 shared evalsClaude Sonnet 4.5 vs GPT-4.119 shared evalsGPT-5 Nano vs Qwen3.6 Plus19 shared evalsGPT-4o vs GPT-5 Nano18 shared evalsClaude Sonnet 4.5 vs GPT-4o-mini17 shared evalsClaude Sonnet 4.5 vs GPT-4.1 Nano16 shared evalsGPT-4o-mini vs GPT-5 Nano16 shared evalsClaude Sonnet 4.5 vs GPT-6 Astra11 shared evalsGPT-5 Nano vs GPT-6 Astra10 shared evals
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