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
| Model | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Claude Opus 4.8 Anthropic | 66.7% | 1840elo | 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% | - | - | - | 62.0% | - | - | 1281elo | 40.0% | - | - | 53.9% | 13.4% | - | 22.5% | 1890elo | - | - | - | - | - | 56.9% | - | - | - | - | 10.4% | - | - | - | - | - | - | 91.8% | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 69.2% | - | - | - | - | 82.7% | - | 55.1% | 70.9% | - | - | 63.1% |
| Claude Sonnet 4.5 Anthropic | 60.8% | 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% | 40.6% | 84.5% | 64.0% | 62.9% | 19.0% | 32.9% | 45.7% | 73.3% | 35.6% | 22.6% | 78.1% | 0.0% | 0.0% | 88.0% | 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% | 71.4% | 0.75 | 0.75 | 0.0% | - | 0 | 0 | 87.5% | 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% | 77.2% | 67.0% | 74.8% | - | 0.0% | 0 | 0 | 50.34 | - | 0 | - | - | 0.0% | 1.49 | 29.2% |
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 83.4% 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.
Other head-to-heads
56Claude Opus 4.8 vs GPT-5.541 shared evalsClaude Fable 5 vs Claude Opus 4.840 shared evalsClaude Opus 4.8 vs Gemini 3.1 Pro Preview38 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 Sonnet 4.5 vs GPT-5 Nano31 shared evalsClaude Opus 4.7 vs Claude Opus 4.830 shared evalsClaude Opus 4.8 vs Claude Sonnet 4.629 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 evalsClaude Opus 4.6 vs Claude Opus 4.828 shared evalsClaude Opus 4.8 vs GPT-5.428 shared evalsClaude Opus 4.8 vs Kimi K2.528 shared evalsClaude Sonnet 4.5 vs Gemini 3.1 Pro Preview27 shared evalsClaude Sonnet 4.5 vs DeepSeek V3.227 shared evalsClaude Opus 4.8 vs GLM 5.127 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 evalsClaude Opus 4.8 vs GPT-5.226 shared evalsClaude Opus 4.8 vs GPT-5.4 Mini26 shared evalsClaude Sonnet 4.5 vs GLM 4.725 shared evalsClaude Opus 4.8 vs Qwen3.6 Plus25 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 evalsClaude Opus 4.8 vs GPT-5 Mini24 shared evalsClaude Opus 4.5 vs Claude Opus 4.824 shared evalsClaude Opus 4.8 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 evalsClaude Sonnet 4.5 vs Qwen3.6 Plus22 shared evalsClaude Opus 4.8 vs GPT-5 Nano22 shared evalsClaude 4 Sonnet vs Claude Opus 4.822 shared evalsClaude Opus 4.8 vs DeepSeek V3.222 shared evalsClaude Sonnet 4.5 vs GPT-4o21 shared evalsClaude Opus 4.8 vs GLM 4.721 shared evalsClaude Opus 4.8 vs Gemini 2.5 Pro20 shared evalsClaude Sonnet 4.5 vs GPT-4.119 shared evalsClaude Opus 4.8 vs GPT-6 Astra19 shared evalsClaude Opus 4.8 vs gpt-oss-120b18 shared evalsClaude Sonnet 4.5 vs GPT-4o-mini17 shared evalsClaude Opus 4.8 vs GPT-517 shared evalsClaude Sonnet 4.5 vs GPT-4.1 Nano16 shared evalsClaude Opus 4.8 vs GPT-4o14 shared evalsClaude Opus 4.8 vs GPT-4o-mini12 shared evalsClaude Opus 4.8 vs GPT-4.1 Nano12 shared evalsClaude Opus 4.8 vs GPT-4.1 Mini11 shared evalsClaude Sonnet 4.5 vs GPT-6 Astra11 shared evalsClaude Opus 4.8 vs GPT-4.111 shared evals
Comparing something else? Build your own side-by-side.