GPT-5 Nano vs Kimi K2.5
Head to head on 22 shared benchmarks, with price, context window, and release dates.
Benchmark scores
64evals · sort by any column, ⤢ to expand fullscreen
| Model | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Kimi K2.5 Moonshot AI | 1579elo | 74.9 | 27.9% | 87.9% | 30.7% | 70.2% | 72.5% | 77.9% | 61.4% | 57.4% | 77.7% | 84.9% | 76.0% | 39.3% | 76.4% | 66.5% | 49.9% | 49.0% | 70.8% | 74.2% | 34.8% | 95.9% | - | - | 96.1 | - | - | - | 68.3% | 35.0% | - | 35.8% | - | - | - | 95.4 | 78.5% | 10421 | - | - | - | - | - | 62.0% | - | 87.1 | - | - | - | 63.3% | - | - | - | 73 | 67.3% | 69.4 | - | 26.3% | - | - | 17.5% | - | - | - | 59.8% |
| GPT-5 Nano OpenAI | 705elo | 28 | 8.3% | 67.6% | 9.5% | 67.6% | 52.8% | 62.4% | 43.4% | 55.7% | 46.8% | 68.4% | 40.3% | 30.4% | 72.9% | 53.6% | 30.4% | 36.6% | 34.8% | 67.4% | 12.1% | 36.5% | 0.0% | 83.7% | - | 0.25 | 0.21 | 6.7% | - | - | 10.0% | - | 78.2% | 1.18 | 100.0% | - | - | - | 78.9% | 1.38 | 1.38 | 100.0% | 100.0% | - | 26.7% | - | 78.0% | 100.0% | 0.0% | - | 0.0% | 12.0% | 1.72 | - | - | - | 29.7% | - | 20.41 | -6.67 | - | 82.0% | 82.0% | 40.0% | 48.9% |
2 / 2 models
| Attribute | GPT-5 Nano OpenAI | Kimi K2.5 Moonshot AI |
|---|---|---|
| Description | GPT-5 nano is an AI model from OpenAI. | Kimi K2.5 is an AI model from Kimi. |
| Family | GPT | Kimi |
| Params | - | - |
| Open weights | closed | open |
| License | proprietary | Modified MIT |
| Released | 7 Aug 2025 | 27 Jan 2026 |
| Context | 400,000 | 262,144 |
| Input $/1M | $0.05 | $0.60 |
| Output $/1M | $0.40 | $2.75 |
| Cache read $/1M | $0.005 | $0.070 |
| Cache write $/1M | - | - |
| Speed | 0 tok/s | 0 tok/s |
| Latency | 0.00 s | 0.00 s |
| Modalities | text, image, file | text, image |
| Providers | - | - |
| Publisher | OpenAI | Moonshot AI |
| Reported scores | GPQA Diamond87.9% (AA) Humanity's Last Exam (HLE)30.7% (AA) IFBench70.2% (AA) SciCode49.0% (AA) τ²-bench (Tau²-bench)95.9% (AA) |
FAQ
- Is GPT-5 Nano or Kimi K2.5 better?
- Across the 22 benchmarks both models report on Sophon, Kimi K2.5 leads on 22 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
- How do GPT-5 Nano and Kimi K2.5 compare on GPQA Diamond?
- GPT-5 Nano scores 67.6% and Kimi K2.5 scores 87.9% on GPQA Diamond.
- Which is cheaper, GPT-5 Nano or Kimi K2.5?
- GPT-5 Nano is cheaper at $0.40 per million output tokens against $2.75 for Kimi K2.5 - about 6.9x.
- When were GPT-5 Nano and Kimi K2.5 released?
- GPT-5 Nano was released 7 Aug 2025 by OpenAI. Kimi K2.5 was released 27 Jan 2026 by Moonshot AI.
Other head-to-heads
56GPT-5 Mini vs GPT-5 Nano38 shared evalsClaude Sonnet 4.5 vs GPT-5 Nano31 shared evalsClaude Opus 4.6 vs Kimi K2.531 shared evalsGemini 3.1 Pro Preview vs Kimi K2.530 shared evalsGPT-5.2 vs Kimi K2.529 shared evalsKimi K2.5 vs Qwen3.6 Plus29 shared evalsClaude Sonnet 4.5 vs Kimi K2.528 shared evalsGPT-5 vs GPT-5 Nano28 shared evalsGPT-5.5 vs Kimi K2.528 shared evalsClaude Opus 4.8 vs Kimi K2.528 shared evalsGPT-5.4 vs Kimi K2.528 shared evalsClaude Opus 4.7 vs Kimi K2.528 shared evalsClaude Sonnet 4.6 vs Kimi K2.527 shared evalsGPT-4.1 Mini vs GPT-5 Nano26 shared evalsGPT-5 Nano vs GPT-5.226 shared evalsClaude Opus 4.5 vs GPT-5 Nano26 shared evalsClaude Opus 4.5 vs Kimi K2.526 shared evalsClaude Fable 5 vs Kimi K2.526 shared evalsGLM 5.1 vs Kimi K2.526 shared evalsGPT-5 Mini vs Kimi K2.525 shared evalsClaude 4 Sonnet vs GPT-5 Nano25 shared evalsDeepSeek V3.2 vs Kimi K2.525 shared evalsGPT-5.4 Mini vs Kimi K2.525 shared evalsGemini 2.5 Pro vs GPT-5 Nano24 shared evalsGPT-5 Nano vs Grok 4.1 Fast24 shared evalsGrok 4.1 Fast vs Kimi K2.524 shared evalsGPT-5 Nano vs GPT-5.523 shared evalsClaude Opus 4.6 vs GPT-5 Nano23 shared evalsGLM 4.7 vs GPT-5 Nano23 shared evalsClaude 4 Sonnet vs Kimi K2.523 shared evalsGemini 3.1 Pro Preview vs GPT-5 Nano22 shared evalsClaude Opus 4.8 vs GPT-5 Nano22 shared evalsGPT-5 Nano vs GPT-5.422 shared evalsClaude Opus 4.7 vs GPT-5 Nano22 shared evalsDeepSeek V3.2 vs GPT-5 Nano22 shared evalsGPT-4.1 Nano vs GPT-5 Nano22 shared evalsGPT-5 Nano vs gpt-oss-120b22 shared evalsClaude Fable 5 vs GPT-5 Nano21 shared evalsGLM 5.1 vs GPT-5 Nano21 shared evalsGemini 2.5 Pro vs Kimi K2.521 shared evalsGPT-4.1 vs GPT-5 Nano20 shared evalsClaude Sonnet 4.6 vs GPT-5 Nano20 shared evalsGPT-5.4 Mini vs GPT-5 Nano20 shared evalsGLM 4.7 vs Kimi K2.520 shared evalsGPT-5 Nano vs Qwen3.6 Plus19 shared evalsgpt-oss-120b vs Kimi K2.519 shared evalsGPT-5 vs Kimi K2.518 shared evalsGPT-4o vs GPT-5 Nano18 shared evalsGPT-4o-mini vs GPT-5 Nano16 shared evalsGPT-4o vs Kimi K2.515 shared evalsGPT-6 Astra vs Kimi K2.513 shared evalsGPT-4.1 Mini vs Kimi K2.512 shared evalsGPT-4.1 vs Kimi K2.512 shared evalsGPT-4o-mini vs Kimi K2.512 shared evalsGPT-4.1 Nano vs Kimi K2.512 shared evalsGPT-5 Nano vs GPT-6 Astra10 shared evals
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