Claude 3.5 Sonnet vs Claude Opus 4.5
Head to head on 17 shared benchmarks, with price, context window, and release dates.
Benchmark scores
54evals · sort by any column, ⤢ to expand fullscreen
| Model | |||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Claude Opus 4.5 Anthropic | 91.3% | 61.3% | 1686elo | 73.1 | 20.7% | 80.7% | 25.2% | 78.1% | 79.7% | 62.5% | 81.3% | 87.1% | 89.5% | 68.7% | 49.5% | 79.2% | 74.3% | - | - | - | - | 16.7% | 35.6% | 6.1% | - | 84.7% | - | 12.13 | 83.8% | 58.0% | 83.5% | - | 74.4% | 90.4% | 80.1% | - | 45.2% | 83.2% | 100.0% | 37.4 | 36.0% | 77.5% | - | 45.0% | 45.3 | - | 70.7% | - | 61.8 | 47.0% | - | 20.6% | - | 89.5% | 64.5% |
| Claude 3.5 Sonnet Anthropic | 3.3% | 53.6% | 1451elo | 58.4 | 2.1% | 55.3% | 4.1% | 63.7% | 65.6% | 69.2% | 56.4% | 38.1% | 77.2% | 64.1% | 36.6% | 63.4% | 70.2% | 51.6% | 15.7% | 52.4% | 24.2% | - | - | - | 28.0% | - | 96.4 | - | - | - | - | 0.0% | - | - | - | 77.1% | - | - | - | - | - | - | 0.0% | - | - | 51.3% | - | 25.3% | - | - | 0.98 | - | 62.6% | - | 42.7% |
2 / 2 models
| Attribute | Claude 3.5 Sonnet Anthropic | Claude Opus 4.5 Anthropic |
|---|---|---|
| Description | Claude Sonnet 3.5 is an AI model from Anthropic. | Claude Opus 4.5 is an AI model from Anthropic. |
| Family | Claude | Claude |
| Params | - | - |
| Open weights | closed | closed |
| License | proprietary | proprietary |
| Released | 22 Oct 2024 | 24 Nov 2025 |
| Context | 200,000 | 200,000 |
| Input $/1M | $3.00 | $5.00 |
| Output $/1M | $15.00 | $25.00 |
| Cache read $/1M | - | $0.500 |
| Cache write $/1M | - | $6.250 |
| Speed | 0 tok/s | 0 tok/s |
| Latency | 0.00 s | 0.00 s |
| Modalities | text, image | file, image, text |
| Providers | - | - |
| Publisher | Anthropic | Anthropic |
| Reported scores | MortgageTax64.1% Traveling Salesman0.98 (3 samples) SWE-bench Verified63.4% (SWE-bench) SWE-bench Lite51.3% (SWE-bench) SWE-bench Multimodal25.3% (SWE-bench) |
FAQ
- Is Claude 3.5 Sonnet or Claude Opus 4.5 better?
- Across the 17 benchmarks both models report on Sophon, Claude Opus 4.5 leads on 16 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
- How do Claude 3.5 Sonnet and Claude Opus 4.5 compare on GPQA Diamond?
- Claude 3.5 Sonnet scores 55.3% and Claude Opus 4.5 scores 80.7% on GPQA Diamond.
- Which is cheaper, Claude 3.5 Sonnet or Claude Opus 4.5?
- Claude 3.5 Sonnet is cheaper at $15.00 per million output tokens against $25.00 for Claude Opus 4.5 - about 1.7x.
- When were Claude 3.5 Sonnet and Claude Opus 4.5 released?
- Claude 3.5 Sonnet was released 22 Oct 2024 by Anthropic. Claude Opus 4.5 was released 24 Nov 2025 by Anthropic.
Other head-to-heads
56Claude Opus 4.5 vs GPT-5.235 shared evalsClaude Opus 4.5 vs Claude Sonnet 4.534 shared evalsClaude Opus 4.5 vs GPT-5 Mini31 shared evalsClaude Opus 4.5 vs Grok 4.1 Fast29 shared evalsClaude Opus 4.5 vs Gemini 3.1 Pro Preview28 shared evalsClaude Opus 4.5 vs GPT-5.428 shared evalsClaude Opus 4.5 vs Claude Opus 4.628 shared evalsClaude Opus 4.5 vs Kimi K2.527 shared evalsClaude Opus 4.5 vs DeepSeek V3.227 shared evalsClaude Opus 4.5 vs GPT-5 Nano26 shared evalsClaude 4 Sonnet vs Claude Opus 4.526 shared evalsClaude Opus 4.5 vs GPT-5.525 shared evalsClaude Opus 4.5 vs GLM 4.725 shared evalsClaude Opus 4.5 vs Claude Opus 4.824 shared evalsClaude Opus 4.5 vs Claude Opus 4.724 shared evalsClaude Opus 4.5 vs Gemini 2.5 Pro24 shared evalsClaude Opus 4.5 vs GPT-523 shared evalsClaude Fable 5 vs Claude Opus 4.523 shared evalsClaude Opus 4.5 vs GLM 5.123 shared evalsClaude Opus 4.5 vs Claude Sonnet 4.623 shared evalsClaude Opus 4.5 vs Qwen3.6 Plus22 shared evalsClaude 3.5 Sonnet vs GPT-4o22 shared evalsClaude Opus 4.5 vs gpt-oss-120b21 shared evalsClaude 3.5 Sonnet vs Claude 4 Sonnet21 shared evalsClaude 3.5 Sonnet vs Gemini 2.5 Pro21 shared evalsClaude 3.5 Sonnet vs Claude Sonnet 4.519 shared evalsClaude 3.5 Sonnet vs GPT-5 Mini19 shared evalsClaude 3.5 Sonnet vs GPT-4o-mini19 shared evalsClaude Opus 4.5 vs GPT-4o18 shared evalsClaude 3.5 Sonnet vs GPT-4.118 shared evalsClaude 3.5 Sonnet vs GPT-4.1 Mini17 shared evalsClaude 3.5 Sonnet vs GPT-517 shared evalsClaude 3.5 Sonnet vs GPT-5 Nano17 shared evalsClaude 3.5 Sonnet vs GPT-5.217 shared evalsClaude 3.5 Sonnet vs DeepSeek V3.217 shared evalsClaude Opus 4.5 vs GPT-4.1 Mini16 shared evalsClaude Opus 4.5 vs GPT-4.116 shared evalsClaude 3.5 Sonnet vs GPT-4.1 Nano16 shared evalsClaude 3.5 Sonnet vs gpt-oss-120b16 shared evalsClaude Opus 4.5 vs GPT-4o-mini15 shared evalsClaude Opus 4.5 vs GPT-4.1 Nano15 shared evalsClaude 3.5 Sonnet vs Kimi K2.515 shared evalsClaude 3.5 Sonnet vs Grok 4.1 Fast15 shared evalsClaude 3.5 Sonnet vs GLM 4.715 shared evalsClaude 3.5 Sonnet vs GPT-5.514 shared evalsClaude 3.5 Sonnet vs Claude Opus 4.614 shared evalsClaude 3.5 Sonnet vs Gemini 3.1 Pro Preview13 shared evalsClaude 3.5 Sonnet vs Claude Opus 4.813 shared evalsClaude 3.5 Sonnet vs GPT-5.413 shared evalsClaude 3.5 Sonnet vs GLM 5.113 shared evalsClaude 3.5 Sonnet vs Claude Sonnet 4.613 shared evalsClaude 3.5 Sonnet vs Claude Opus 4.713 shared evalsClaude 3.5 Sonnet vs Claude Fable 512 shared evalsClaude Opus 4.5 vs GPT-6 Astra11 shared evalsClaude 3.5 Sonnet vs Qwen3.6 Plus11 shared evalsClaude 3.5 Sonnet vs GPT-6 Astra6 shared evals
Comparing something else? Build your own side-by-side.