Claude Sonnet 4.5 vs GPT-5
Head to head on 31 shared benchmarks, with price, context window, and release dates.
Benchmark scores
113evals · sort by any column, ⤢ to expand fullscreen
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| GPT-5 OpenAI | 46.7% | 94.3% | 61.1% | 1627elo | 72.8 | 32.4% | 83.3% | 85.4% | 28.5% | 73.1% | 83.4% | 58.2% | 84.6% | 0.52 | 1.62 | 99.4% | 49.6% | 83.7% | 87.1% | 65.5% | 0.0% | 18.0% | 43.7% | 42.9% | 74.9% | 74.4% | 73.4% | 32.6% | 20.1% | 54.8% | 84.8% | 91.1% | - | 88.0% | 94.6% | - | - | - | 0.0% | - | - | 0.15 | 0.0% | 68.1% | 4.58 | - | - | - | 57.7% | 80.0% | 80.0% | - | - | - | - | 91.7% | - | 0.0% | 88.9% | - | - | - | - | 100.0% | - | - | 48.9% | - | - | - | - | - | - | - | - | - | 37.5% | 100.0% | - | 0.0% | 92.7% | 92.7% | - | 93.3% | 10.0% | 0.0% | - | 60.0% | - | 0.26 | - | - | - | - | - | - | - | - | - | - | - | - | - | 2.34 | - | - | - | 87.5% | - | 0.86 | 90.0% | 90.0% | - | 61.9% |
| Claude Sonnet 4.5 Anthropic | 0.0% | 88.0% | 60.8% | 1678elo | 71.4 | 15.2% | 83.9% | 83.4% | 17.8% | 57.3% | 83.8% | 0.0% | 71.4% | 0.75 | 0.75 | 0.0% | 40.6% | 84.5% | 87.5% | 64.0% | 0.0% | 19.0% | 32.9% | 45.7% | 77.2% | 74.8% | 73.3% | 35.6% | 22.6% | 0.0% | 78.1% | - | 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% | - | 87.5% | 0.0% | 70.7% | 80.4% | 57.0% | 53.4% | 76.5% | 79.3% | 77.6% | - | - | 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% | 67.0% | 0.0% | - | 0 | 0 | 50.34 | - | 0 | - | - | - | 1.49 | 29.2% |
2 / 2 models
| Attribute | Claude Sonnet 4.5 Anthropic | GPT-5 OpenAI |
|---|---|---|
| Description | anthropic/claude-sonnet-4.5 is an AI model. | OpenAI's August 2025 unified frontier model that auto-routes between a fast model and a deeper "thinking" variant. |
| Family | Claude | GPT 5 |
| Params | Undisclosed (closed) | Undisclosed (closed) |
| Open weights | closed | closed |
| License | proprietary | proprietary |
| Released | 29 Sep 2025 | 7 Aug 2025 |
| Context | 1,000,000 | 400,000 |
| Input $/1M | $3.00 | $1.25 |
| Output $/1M | $15.00 | $10.00 |
| Cache read $/1M | $0.300 | $0.125 |
| Cache write $/1M | $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 | openai |
| Publisher | Anthropic | OpenAI |
| Reported scores | TaxEval v273.3% LiveBench - Math79.3% (LiveBench) LiveBench - Coding80.4% (LiveBench) LiveBench - Language76.5% (LiveBench) LiveBench - Data Analysis57.0% (LiveBench) | SWE-bench74.9% (Verified) GPQA Diamond85.4% (AA) Humanity's Last Exam (HLE)28.5% (AA) IFBench73.1% (AA) |
FAQ
- Is Claude Sonnet 4.5 or GPT-5 better?
- Across the 31 benchmarks both models report on Sophon, GPT-5 leads on 18 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
- How do Claude Sonnet 4.5 and GPT-5 compare on GPQA Diamond?
- Claude Sonnet 4.5 scores 83.4% and GPT-5 scores 85.4% on GPQA Diamond.
- Which is cheaper, Claude Sonnet 4.5 or GPT-5?
- GPT-5 is cheaper at $10.00 per million output tokens against $15.00 for Claude Sonnet 4.5 - about 1.5x.
- When were Claude Sonnet 4.5 and GPT-5 released?
- Claude Sonnet 4.5 was released 29 Sep 2025 by Anthropic. GPT-5 was released 7 Aug 2025 by OpenAI.
Other head-to-heads
56GPT-4.1 Mini vs GPT-541 shared evalsGPT-5 vs GPT-5 Mini36 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-5 Nano31 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 evalsGPT-5 vs GPT-5 Nano28 shared evalsGPT-4.1 vs GPT-528 shared evalsClaude Sonnet 4.5 vs Gemini 3.1 Pro Preview27 shared evalsClaude Sonnet 4.5 vs DeepSeek V3.227 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 Claude Sonnet 4.525 shared evalsClaude Sonnet 4.5 vs GLM 4.725 shared evalsClaude 4 Sonnet vs GPT-525 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 evalsGemini 2.5 Pro vs GPT-524 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 evalsGPT-5 vs GPT-5.223 shared evalsClaude Opus 4.5 vs GPT-523 shared evalsClaude Sonnet 4.5 vs Qwen3.6 Plus22 shared evalsClaude Sonnet 4.5 vs GPT-4o21 shared evalsGPT-4.1 Nano vs GPT-521 shared evalsGPT-5 vs Grok 4.1 Fast20 shared evalsClaude Sonnet 4.5 vs GPT-4.119 shared evalsGemini 3.1 Pro Preview vs GPT-519 shared evalsClaude Opus 4.6 vs GPT-519 shared evalsGPT-5 vs GPT-5.419 shared evalsDeepSeek V3.2 vs GPT-519 shared evalsGPT-4o vs GPT-519 shared evalsGPT-5 vs GPT-5.518 shared evalsGPT-5 vs Kimi K2.518 shared evalsClaude Sonnet 4.5 vs GPT-4o-mini17 shared evalsClaude Opus 4.8 vs GPT-517 shared evalsClaude Opus 4.7 vs GPT-517 shared evalsGPT-5 vs gpt-oss-120b17 shared evalsGLM 4.7 vs GPT-517 shared evalsClaude Sonnet 4.5 vs GPT-4.1 Nano16 shared evalsClaude Fable 5 vs GPT-516 shared evalsGPT-4o-mini vs GPT-516 shared evalsClaude Sonnet 4.6 vs GPT-516 shared evalsGLM 5.1 vs GPT-516 shared evalsGPT-5 vs GPT-5.4 Mini16 shared evalsGPT-5 vs Qwen3.6 Plus15 shared evalsGPT-5 vs GPT-6 Astra12 shared evalsClaude Sonnet 4.5 vs GPT-6 Astra11 shared evals
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