Claude Sonnet 4.5 vs gpt-oss-120b
Head to head on 23 shared benchmarks, with price, context window, and release dates.
Benchmark scores
90evals · sort by any column, ⤢ to expand fullscreen
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| gpt-oss-120b OpenAI | 93.4% | 58.2% | 961elo | 35.8 | 78.2% | 19.6% | 69.0% | 51.0% | 60.2% | 38.8% | 50.3% | 48.6% | 68.9% | 39.2% | 87.8% | 1.62 | 1.53 | 80.8% | 34.0% | 26.0% | 71.6% | 23.5% | 65.8% | - | - | 41.8% | - | - | - | - | - | 38.9% | 7.6% | - | - | - | 11.0% | - | - | - | - | - | - | - | - | - | - | - | 57.6 | - | - | - | - | - | - | - | - | - | - | - | 80.0% | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 97.9% | - | - | - | - | - | - | - | - | - | 65.6% | - | - | - | - | 54.1% |
| Claude Sonnet 4.5 Anthropic | 88.0% | 60.8% | 1678elo | 71.4 | 83.4% | 17.8% | 57.3% | 70.7% | 80.4% | 57.0% | 53.4% | 76.5% | 79.3% | 77.6% | 71.4% | 0.75 | 0.75 | 87.5% | 45.7% | 74.8% | 73.3% | 35.6% | 78.1% | 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% | 15.2% | 0.0% | 0.0% | 83.9% | 0.0% | 0.0% | 0.0% | - | 0.0% | 0.0% | 87.5% | 83.8% | 0.0% | 0.0% | 0.0% | 0 | 40.6% | 84.5% | 0 | - | 64.0% | 0.0% | 0.0% | 62.9% | 0.0% | 0.0% | 19.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 32.9% | 0.0% | - | 0 | 0.0% | 0.0% | 77.2% | 67.0% | 0.0% | 0 | 0 | 50.34 | - | 0 | 22.6% | 0.0% | 1.49 | 29.2% |
2 / 2 models
| Attribute | Claude Sonnet 4.5 Anthropic | gpt-oss-120b OpenAI |
|---|---|---|
| Description | anthropic/claude-sonnet-4.5 is an AI model. | GPT-Oss 120b is an AI model from OpenAI, released with open weights. |
| Family | Claude | GPT |
| Params | Undisclosed (closed) | - |
| Open weights | closed | open |
| License | proprietary | apache-2.0 |
| Released | 29 Sep 2025 | 5 Aug 2025 |
| Context | 1,000,000 | 131,072 |
| Input $/1M | $3.00 | $0.15 |
| Output $/1M | $15.00 | $0.59 |
| Cache read $/1M | $0.300 | $0.075 |
| Cache write $/1M | $3.750 | - |
| Speed | 0 tok/s | 194 tok/s |
| Latency | 0.00 s | 0.53 s |
| Modalities | text, image, file | text |
| Providers | anthropic, aws-bedrock, vertex-ai | - |
| 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) | GPQA Diamond78.2% (AA) Humanity's Last Exam (HLE)19.6% (AA) LiveCodeBench87.8% (AA) MMLU-Pro80.8% (AA) SciCode34.0% (AA) |
FAQ
- Is Claude Sonnet 4.5 or gpt-oss-120b better?
- Across the 23 benchmarks both models report on Sophon, Claude Sonnet 4.5 leads on 17 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-oss-120b compare on GPQA Diamond?
- Claude Sonnet 4.5 scores 83.4% and gpt-oss-120b scores 78.2% on GPQA Diamond.
- Which is cheaper, Claude Sonnet 4.5 or gpt-oss-120b?
- gpt-oss-120b is cheaper at $0.59 per million output tokens against $15.00 for Claude Sonnet 4.5 - about 25.2x.
- When were Claude Sonnet 4.5 and gpt-oss-120b released?
- Claude Sonnet 4.5 was released 29 Sep 2025 by Anthropic. gpt-oss-120b was released 5 Aug 2025 by OpenAI.
Other head-to-heads
56Claude 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 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 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 evalsGPT-5 Mini vs gpt-oss-120b25 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 Sonnet 4.5 vs GLM 5.123 shared evalsClaude Sonnet 4.5 vs GPT-5.4 Mini23 shared evalsDeepSeek V3.2 vs gpt-oss-120b23 shared evalsClaude Sonnet 4.5 vs Qwen3.6 Plus22 shared evalsGPT-5 Nano vs gpt-oss-120b22 shared evalsGPT-5.2 vs gpt-oss-120b22 shared evalsClaude Sonnet 4.5 vs GPT-4o21 shared evalsClaude Opus 4.5 vs gpt-oss-120b21 shared evalsClaude 4 Sonnet vs gpt-oss-120b21 shared evalsgpt-oss-120b vs Grok 4.1 Fast20 shared evalsGLM 4.7 vs gpt-oss-120b20 shared evalsClaude Sonnet 4.5 vs GPT-4.119 shared evalsGPT-5.5 vs gpt-oss-120b19 shared evalsClaude Opus 4.6 vs gpt-oss-120b19 shared evalsgpt-oss-120b vs Kimi K2.519 shared evalsGLM 5.1 vs gpt-oss-120b19 shared evalsGemini 2.5 Pro vs gpt-oss-120b19 shared evalsGemini 3.1 Pro Preview vs gpt-oss-120b18 shared evalsClaude Opus 4.8 vs gpt-oss-120b18 shared evalsClaude Fable 5 vs gpt-oss-120b18 shared evalsGPT-5.4 vs gpt-oss-120b18 shared evalsClaude Sonnet 4.6 vs gpt-oss-120b18 shared evalsClaude Opus 4.7 vs gpt-oss-120b18 shared evalsClaude Sonnet 4.5 vs GPT-4o-mini17 shared evalsGPT-5 vs gpt-oss-120b17 shared evalsGPT-4o vs gpt-oss-120b17 shared evalsGPT-5.4 Mini vs gpt-oss-120b17 shared evalsClaude Sonnet 4.5 vs GPT-4.1 Nano16 shared evalsGPT-4.1 vs gpt-oss-120b16 shared evalsgpt-oss-120b vs Qwen3.6 Plus16 shared evalsGPT-4.1 Mini vs gpt-oss-120b15 shared evalsGPT-4o-mini vs gpt-oss-120b15 shared evalsGPT-4.1 Nano vs gpt-oss-120b14 shared evalsClaude Sonnet 4.5 vs GPT-6 Astra11 shared evalsGPT-6 Astra vs gpt-oss-120b6 shared evals
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