GPT-5 Nano vs gpt-oss-120b
Head to head on 22 shared benchmarks, with price, context window, and release dates.
Benchmark scores
58evals · sort by any column, ⤢ to expand fullscreen
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| gpt-oss-120b OpenAI | 66.7% | 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% | - | - | - | 58.2% | 13.0% | - | - | - | - | - | 57.6 | - | - | - | - | - | 80.0% | - | - | - | - | - | - | 97.9% | - | 65.6% | - | - | - | - | - | - | 49.6% |
| GPT-5 Nano OpenAI | 27.3% | 703elo | 28 | 42.8% | 4.0% | 32.5% | 52.8% | 62.4% | 43.4% | 55.7% | 46.8% | 68.4% | 40.3% | 47.0% | 1.38 | 1.38 | 55.6% | 29.1% | 34.8% | 67.4% | 6.8% | 25.7% | 0.0% | - | - | - | 0.25 | 0.21 | 6.7% | - | - | 10.0% | 78.2% | 8.3% | 1.18 | 100.0% | - | 100.0% | 100.0% | 26.7% | 30.4% | 72.9% | - | 53.6% | 100.0% | 0.0% | 0.0% | 12.0% | 30.4% | - | 1.72 | - | 29.7% | 20.41 | -6.67 | 82.0% | 82.0% | 40.0% | 43.7% |
2 / 2 models
| Attribute | GPT-5 Nano OpenAI | gpt-oss-120b OpenAI |
|---|---|---|
| Description | GPT-5 nano is an AI model from OpenAI. | GPT-Oss 120b is an AI model from OpenAI, released with open weights. |
| Family | GPT | GPT |
| Params | - | - |
| Open weights | closed | open |
| License | proprietary | apache-2.0 |
| Released | 7 Aug 2025 | 5 Aug 2025 |
| Context | 400,000 | 131,072 |
| Input $/1M | $0.05 | $0.15 |
| Output $/1M | $0.40 | $0.60 |
| Cache read $/1M | $0.005 | $0.030 |
| Cache write $/1M | - | - |
| Speed | 0 tok/s | 186 tok/s |
| Latency | 0.00 s | 0.50 s |
| Modalities | text, image, file | text |
| Providers | - | - |
| Publisher | OpenAI | OpenAI |
| Reported scores | GPQA Diamond67.2% (AA) Humanity's Last Exam (HLE)5.9% (AA) LiveCodeBench70.7% (AA) MMLU-Pro77.5% (AA) SciCode36.0% (AA) |
FAQ
- Is GPT-5 Nano or gpt-oss-120b better?
- Across the 22 benchmarks both models report on Sophon, gpt-oss-120b leads on 15 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
- How do GPT-5 Nano and gpt-oss-120b compare on GPQA Diamond?
- GPT-5 Nano scores 42.8% and gpt-oss-120b scores 67.2% on GPQA Diamond.
- Which is cheaper, GPT-5 Nano or gpt-oss-120b?
- GPT-5 Nano is cheaper at $0.40 per million output tokens against $0.60 for gpt-oss-120b - about 1.5x.
- When were GPT-5 Nano and gpt-oss-120b released?
- GPT-5 Nano was released 7 Aug 2025 by OpenAI. gpt-oss-120b was released 5 Aug 2025 by OpenAI.
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