Claude Opus 4.8 vs Claude Sonnet 4.5
Head to head on 25 shared benchmarks, with price, context window, and release dates.
Benchmark scores
99evals · sort by any column, ⤢ to expand fullscreen
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| Claude Opus 4.8 Anthropic | 66.7% | 1835elo | 80.8 | 47.2% | 92.0% | 48.7% | 62.2% | 80.1% | 79.3% | 78.3% | 67.4% | 81.4% | 84.3% | 89.7% | 53.2% | 85.8% | 69.9% | 83.4% | 69.0% | 54.8% | 53.5% | 75.6% | 58.3% | 82.7% | 94.4% | - | - | - | - | - | - | - | 15.5% | - | 80.4% | 14.5% | - | - | - | 67.0% | - | - | 1281elo | 40.0% | - | - | 53.9% | 13.4% | - | 22.5% | 1890elo | - | - | - | - | - | 56.9% | - | - | - | - | 10.4% | - | - | - | - | - | - | 91.8% | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 69.2% | - | - | - | - | 82.7% | - | 60.9% | 70.9% | - | - | 63.4% |
| Claude Sonnet 4.5 Anthropic | 60.8% | 1675elo | 71.4 | 15.2% | 72.7% | 7.2% | 42.7% | 70.7% | 80.4% | 57.0% | 53.4% | 76.5% | 79.3% | 77.6% | 40.6% | 84.5% | 64.0% | 62.9% | 19.0% | 32.9% | 42.8% | 73.3% | 28.8% | 22.6% | 70.5% | 0.0% | 0.0% | 37.0% | 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% | 83.9% | 0.0% | 0.0% | 0.0% | - | 0.0% | 0.0% | 87.5% | 83.8% | - | 0.0% | 0.0% | 59.0% | 0.75 | 0.75 | 0.0% | - | 0 | 0 | 86.0% | 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% | 77.2% | 67.0% | 74.8% | - | 0.0% | 0 | 0 | 50.34 | - | 0 | - | - | 0.0% | 1.49 | 27.5% |
2 / 2 models
| Attribute | Claude Opus 4.8 Anthropic | Claude Sonnet 4.5 Anthropic |
|---|---|---|
| Description | Claude Opus 4.8 (Adaptive Reasoning, Max Effort) is an AI model from Anthropic. | anthropic/claude-sonnet-4.5 is an AI model. |
| Family | Claude | Claude |
| Params | - | Undisclosed (closed) |
| Open weights | - | closed |
| License | - | Proprietary |
| Released | 28 May 2026 | 29 Sep 2025 |
| Context | 1,000,000 | 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 | text, image, file | 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 4.8 or Claude Sonnet 4.5 better?
- Across the 25 benchmarks both models report on Sophon, Claude Opus 4.8 leads on 24 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
- How do Claude Opus 4.8 and Claude Sonnet 4.5 compare on GPQA Diamond?
- Claude Opus 4.8 scores 92.0% and Claude Sonnet 4.5 scores 72.7% on GPQA Diamond.
- Which is cheaper, Claude Opus 4.8 or Claude Sonnet 4.5?
- Claude Sonnet 4.5 is cheaper at $15.00 per million output tokens against $25.00 for Claude Opus 4.8 - about 1.7x.
- When were Claude Opus 4.8 and Claude Sonnet 4.5 released?
- Claude Opus 4.8 was released 28 May 2026 by Anthropic. Claude Sonnet 4.5 was released 29 Sep 2025 by Anthropic.
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