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 | 66.7% | 58.2% | 959elo | 35.8 | 67.2% | 5.9% | 58.3% | 51.0% | 60.2% | 38.8% | 50.3% | 48.6% | 68.9% | 39.2% | 70.7% | 1.62 | 1.53 | 77.5% | 36.0% | 26.0% | 71.6% | 5.3% | 45.0% | - | - | 41.8% | - | - | - | - | - | 38.9% | 7.6% | - | - | - | 13.0% | - | - | - | - | - | - | - | - | - | - | - | 57.6 | - | - | - | - | - | - | - | - | - | - | - | 80.0% | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 97.9% | - | - | - | - | - | - | - | - | - | 65.6% | - | - | - | - | 49.6% |
| Claude Sonnet 4.5 Anthropic | 37.0% | 60.8% | 1675elo | 71.4 | 72.7% | 7.2% | 42.7% | 70.7% | 80.4% | 57.0% | 53.4% | 76.5% | 79.3% | 77.6% | 59.0% | 0.75 | 0.75 | 86.0% | 42.8% | 74.8% | 73.3% | 28.8% | 70.5% | 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 | 27.5% |
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 | $0.60 |
| Cache read $/1M | $0.300 | $0.030 |
| Cache write $/1M | $3.750 | - |
| Speed | 0 tok/s | 186 tok/s |
| Latency | 0.00 s | 0.50 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 Diamond67.2% (AA) Humanity's Last Exam (HLE)5.9% (AA) LiveCodeBench70.7% (AA) MMLU-Pro77.5% (AA) SciCode36.0% (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 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-oss-120b compare on GPQA Diamond?
- Claude Sonnet 4.5 scores 72.7% and gpt-oss-120b scores 67.2% on GPQA Diamond.
- Which is cheaper, Claude Sonnet 4.5 or gpt-oss-120b?
- gpt-oss-120b is cheaper at $0.60 per million output tokens against $15.00 for Claude Sonnet 4.5 - about 25.0x.
- 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.
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