Claude Opus 4.5 vs Claude Sonnet 4.5
Head to head on 34 shared benchmarks, with price, context window, and release dates.
Benchmark scores
89evals · sort by any column, ⤢ to expand fullscreen
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| Claude Opus 4.5 Anthropic | 62.7% | 61.3% | 1683elo | 73.1 | 20.7% | 84.7% | 81.0% | 13.2% | 83.8% | 43.0% | 83.5% | 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% | 77.5% | 45.0% | 47.0% | 70.7% | 79.2% | 74.3% | 61.8 | 40.9% | 20.6% | 86.3% | - | - | - | - | - | - | - | 16.7% | - | - | - | 35.6% | 6.1% | - | - | - | - | - | - | - | - | - | 12.13 | - | - | - | - | - | - | - | - | - | - | - | 100.0% | 37.4 | - | - | - | - | - | - | - | - | 45.3 | - | - | - | - | - | - | - | - | - | - | 62.2% |
| Claude Sonnet 4.5 Anthropic | 37.0% | 60.8% | 1675elo | 71.4 | 15.2% | 83.9% | 72.7% | 7.2% | 87.5% | 42.7% | 83.8% | 70.7% | 80.4% | 57.0% | 53.4% | 76.5% | 79.3% | 77.6% | 59.0% | 40.6% | 84.5% | 86.0% | 64.0% | 19.0% | 0.0% | 32.9% | 42.8% | 67.0% | 74.8% | 73.3% | 50.34 | 28.8% | 22.6% | 70.5% | 0.0% | 0.0% | 100 | 0.0% | 0.0% | 0.0% | 5.0% | - | 0.0% | 0.0% | 0.0% | - | - | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | - | 0.0% | 0.0% | 0.0% | 0.0% | 0.75 | 0.75 | 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% | 0.0% | 0 | 0 | 0 | 0.0% | 1.49 | 27.5% |
2 / 2 models
| Attribute | Claude Opus 4.5 Anthropic | Claude Sonnet 4.5 Anthropic |
|---|---|---|
| Description | Claude Opus 4.5 is an AI model from Anthropic. | anthropic/claude-sonnet-4.5 is an AI model. |
| Family | Claude | Claude |
| Params | - | Undisclosed (closed) |
| Open weights | closed | closed |
| License | proprietary | Proprietary |
| Released | 24 Nov 2025 | 29 Sep 2025 |
| Context | 200,000 | 1,000,000 |
| Input $/1M | $5.00 | $3.00 |
| Output $/1M | $25.00 | $15.00 |
| Cache read $/1M | $0.500 | $0.300 |
| Cache write $/1M | $6.250 | $3.750 |
| Speed | 0 tok/s | 0 tok/s |
| Latency | 0.00 s | 0.00 s |
| Modalities | file, image, text | text, image, file |
| Providers | - | anthropic, aws-bedrock, vertex-ai |
| Publisher | Anthropic | Anthropic |
| 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 Opus 4.5 or Claude Sonnet 4.5 better?
- Across the 34 benchmarks both models report on Sophon, Claude Opus 4.5 leads on 29 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
- How do Claude Opus 4.5 and Claude Sonnet 4.5 compare on GPQA Diamond?
- Claude Opus 4.5 scores 81.0% and Claude Sonnet 4.5 scores 72.7% on GPQA Diamond.
- Which is cheaper, Claude Opus 4.5 or Claude Sonnet 4.5?
- Claude Sonnet 4.5 is cheaper at $15.00 per million output tokens against $25.00 for Claude Opus 4.5 - about 1.7x.
- When were Claude Opus 4.5 and Claude Sonnet 4.5 released?
- Claude Opus 4.5 was released 24 Nov 2025 by Anthropic. Claude Sonnet 4.5 was released 29 Sep 2025 by Anthropic.
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