gpt-oss-120b vs Kimi K2.5
Head to head on 19 shared benchmarks, with price, context window, and release dates.
Benchmark scores
49evals · sort by any column, ⤢ to expand fullscreen
| Model | ||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Kimi K2.5 Moonshot AI | 68.3% | 39.0% | 1576elo | 74.9 | 78.9% | 13.2% | 43.7% | 72.5% | 77.9% | 61.4% | 57.4% | 77.7% | 84.9% | 76.0% | 39.6% | 70.8% | 74.2% | 18.9% | 81.3% | - | - | 96.1 | - | - | 35.8% | 27.9% | - | 95.4 | 78.5% | 10421 | - | - | - | 62.0% | 39.3% | 76.4% | - | 87.1 | - | 66.5% | 63.3% | 49.9% | - | 73 | 67.3% | - | 69.4 | 26.3% | 17.5% | 56.8% |
| gpt-oss-120b OpenAI | 58.2% | 13.0% | 959elo | 35.8 | 67.2% | 5.9% | 58.3% | 51.0% | 60.2% | 38.8% | 50.3% | 48.6% | 68.9% | 39.2% | 36.0% | 26.0% | 71.6% | 5.3% | 45.0% | 41.8% | 66.7% | - | 38.9% | 7.6% | - | - | 57.6 | - | - | - | 70.7% | 1.62 | 1.53 | - | - | - | 80.0% | - | 77.5% | - | - | - | 97.9% | - | - | 65.6% | - | - | - | 49.6% |
2 / 2 models
| Attribute | gpt-oss-120b OpenAI | Kimi K2.5 Moonshot AI |
|---|---|---|
| Description | GPT-Oss 120b is an AI model from OpenAI, released with open weights. | Kimi K2.5 is an AI model from Kimi. |
| Family | GPT | Kimi |
| Params | - | - |
| Open weights | open | closed |
| License | apache-2.0 | Modified MIT |
| Released | 5 Aug 2025 | 27 Jan 2026 |
| Context | 131,072 | 262,144 |
| Input $/1M | $0.15 | $0.60 |
| Output $/1M | $0.60 | $3.00 |
| Cache read $/1M | $0.030 | $0.100 |
| Cache write $/1M | - | - |
| Speed | 186 tok/s | 0 tok/s |
| Latency | 0.50 s | 0.00 s |
| Modalities | text | text, image |
| Providers | - | - |
| Publisher | OpenAI | Moonshot AI |
| Reported scores | GPQA Diamond67.2% (AA) Humanity's Last Exam (HLE)5.9% (AA) LiveCodeBench70.7% (AA) MMLU-Pro77.5% (AA) SciCode36.0% (AA) | GPQA Diamond78.9% (AA) Humanity's Last Exam (HLE)13.2% (AA) IFBench43.7% (AA) SciCode39.6% (AA) τ²-bench (Tau²-bench)81.3% (AA) |
FAQ
- Is gpt-oss-120b or Kimi K2.5 better?
- Across the 19 benchmarks both models report on Sophon, Kimi K2.5 leads on 18 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
- How do gpt-oss-120b and Kimi K2.5 compare on GPQA Diamond?
- gpt-oss-120b scores 67.2% and Kimi K2.5 scores 78.9% on GPQA Diamond.
- Which is cheaper, gpt-oss-120b or Kimi K2.5?
- gpt-oss-120b is cheaper at $0.60 per million output tokens against $3.00 for Kimi K2.5 - about 5.0x.
- When were gpt-oss-120b and Kimi K2.5 released?
- gpt-oss-120b was released 5 Aug 2025 by OpenAI. Kimi K2.5 was released 27 Jan 2026 by Moonshot AI.
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