Claude Opus 4.5 vs GPT-5 Nano
Head to head on 26 shared benchmarks, with price, context window, and release dates.
Benchmark scores
64evals · sort by any column, ⤢ to expand fullscreen
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| Claude Opus 4.5 Anthropic | 62.7% | 1683elo | 73.1 | 20.7% | 81.0% | 13.2% | 43.0% | 78.1% | 79.7% | 74.4% | 62.5% | 81.3% | 90.4% | 80.1% | 73.8% | 45.2% | 83.2% | 88.9% | 68.7% | 36.0% | 45.0% | 47.0% | 79.2% | 74.3% | 40.9% | 86.3% | - | - | - | 16.7% | - | 61.3% | 35.6% | 6.1% | - | - | - | 84.7% | - | 12.13 | 83.8% | 83.5% | - | - | - | - | - | - | - | 100.0% | 37.4 | - | 77.5% | 45.3 | - | 70.7% | 61.8 | - | - | - | 20.6% | - | - | - | 62.2% |
| GPT-5 Nano OpenAI | 27.3% | 703elo | 28 | 8.3% | 42.8% | 4.0% | 32.5% | 52.8% | 62.4% | 43.4% | 55.7% | 46.8% | 68.4% | 40.3% | 47.0% | 30.4% | 72.9% | 55.6% | 53.6% | 12.0% | 30.4% | 29.1% | 34.8% | 67.4% | 6.8% | 25.7% | 0.0% | 0.25 | 0.21 | - | 6.7% | - | - | - | 10.0% | 78.2% | 1.18 | - | 100.0% | - | - | - | 1.38 | 1.38 | 100.0% | 100.0% | 26.7% | 100.0% | 0.0% | - | - | 0.0% | - | - | 1.72 | - | - | 29.7% | 20.41 | -6.67 | - | 82.0% | 82.0% | 40.0% | 43.7% |
2 / 2 models
| Attribute | Claude Opus 4.5 Anthropic | GPT-5 Nano OpenAI |
|---|---|---|
| Description | Claude Opus 4.5 is an AI model from Anthropic. | GPT-5 nano is an AI model from OpenAI. |
| Family | Claude | GPT |
| Params | - | - |
| Open weights | closed | closed |
| License | proprietary | proprietary |
| Released | 24 Nov 2025 | 7 Aug 2025 |
| Context | 200,000 | 400,000 |
| Input $/1M | $5.00 | $0.05 |
| Output $/1M | $25.00 | $0.40 |
| Cache read $/1M | $0.500 | $0.005 |
| Cache write $/1M | $6.250 | - |
| Speed | 0 tok/s | 0 tok/s |
| Latency | 0.00 s | 0.00 s |
| Modalities | file, image, text | text, image, file |
| Providers | - | - |
| Publisher | Anthropic | OpenAI |
| Reported scores |
FAQ
- Is Claude Opus 4.5 or GPT-5 Nano better?
- Across the 26 benchmarks both models report on Sophon, Claude Opus 4.5 leads on 26 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
- How do Claude Opus 4.5 and GPT-5 Nano compare on GPQA Diamond?
- Claude Opus 4.5 scores 81.0% and GPT-5 Nano scores 42.8% on GPQA Diamond.
- Which is cheaper, Claude Opus 4.5 or GPT-5 Nano?
- GPT-5 Nano is cheaper at $0.40 per million output tokens against $25.00 for Claude Opus 4.5 - about 62.5x.
- When were Claude Opus 4.5 and GPT-5 Nano released?
- Claude Opus 4.5 was released 24 Nov 2025 by Anthropic. GPT-5 Nano was released 7 Aug 2025 by OpenAI.
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