Claude Sonnet 4.5 vs Kimi K2.5
Head to head on 28 shared benchmarks, with price, context window, and release dates.
Benchmark scores
91evals · sort by any column, ⤢ to expand fullscreen
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| Kimi K2.5 Moonshot AI | 96.1 | 68.3% | 1576elo | 74.9 | 27.9% | 78.9% | 13.2% | 43.7% | 78.5% | 72.5% | 77.9% | 61.4% | 57.4% | 77.7% | 84.9% | 76.0% | 39.3% | 76.4% | 66.5% | 63.3% | 49.9% | 39.6% | 67.3% | 70.8% | 74.2% | 18.9% | 17.5% | 81.3% | - | - | - | - | - | - | - | - | - | - | 39.0% | - | - | - | - | 35.8% | - | - | - | - | - | - | - | - | 95.4 | - | 10421 | - | - | - | - | - | - | 62.0% | - | - | 87.1 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 73 | - | - | - | - | - | 69.4 | - | 26.3% | - | - | 56.8% |
| Claude Sonnet 4.5 Anthropic | 100 | 60.8% | 1675elo | 71.4 | 15.2% | 72.7% | 7.2% | 42.7% | 83.8% | 70.7% | 80.4% | 57.0% | 53.4% | 76.5% | 79.3% | 77.6% | 40.6% | 84.5% | 64.0% | 62.9% | 32.9% | 42.8% | 67.0% | 74.8% | 73.3% | 28.8% | 22.6% | 70.5% | 0.0% | 0.0% | 37.0% | 0.0% | 0.0% | 0.0% | 5.0% | 0.0% | 0.0% | 0.0% | - | 0.0% | 0.0% | 0.0% | 0.0% | - | 0.0% | 0.0% | 83.9% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | - | 87.5% | - | 0.0% | 0.0% | 59.0% | 0.75 | 0.75 | 0.0% | - | 0 | 0 | - | 86.0% | 0.0% | 0.0% | 0.0% | 0.0% | 19.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0 | 0.0% | 0.0% | - | 77.2% | 0.0% | 0 | 0 | 50.34 | - | 0 | - | 0.0% | 1.49 | 27.5% |
2 / 2 models
| Attribute | Claude Sonnet 4.5 Anthropic | Kimi K2.5 Moonshot AI |
|---|---|---|
| Description | anthropic/claude-sonnet-4.5 is an AI model. | Kimi K2.5 is an AI model from Kimi. |
| Family | Claude | Kimi |
| Params | Undisclosed (closed) | - |
| Open weights | closed | closed |
| License | Proprietary | Modified MIT |
| Released | 29 Sep 2025 | 27 Jan 2026 |
| Context | 1,000,000 | 262,144 |
| Input $/1M | $3.00 | $0.60 |
| Output $/1M | $15.00 | $3.00 |
| Cache read $/1M | $0.300 | $0.100 |
| Cache write $/1M | $3.750 | - |
| Speed | 0 tok/s | 0 tok/s |
| Latency | 0.00 s | 0.00 s |
| Modalities | text, image, file | text, image |
| Providers | anthropic, aws-bedrock, vertex-ai | - |
| Publisher | Anthropic | Moonshot AI |
| Reported scores | TaxEval v273.3% LiveBench - Math79.3% (LiveBench) LiveBench - Coding80.4% (LiveBench) LiveBench - Language76.5% (LiveBench) LiveBench - Data Analysis57.0% (LiveBench) | 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 Claude Sonnet 4.5 or Kimi K2.5 better?
- Across the 28 benchmarks both models report on Sophon, Kimi K2.5 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 Kimi K2.5 compare on GPQA Diamond?
- Claude Sonnet 4.5 scores 72.7% and Kimi K2.5 scores 78.9% on GPQA Diamond.
- Which is cheaper, Claude Sonnet 4.5 or Kimi K2.5?
- Kimi K2.5 is cheaper at $3.00 per million output tokens against $15.00 for Claude Sonnet 4.5 - about 5.0x.
- When were Claude Sonnet 4.5 and Kimi K2.5 released?
- Claude Sonnet 4.5 was released 29 Sep 2025 by Anthropic. Kimi K2.5 was released 27 Jan 2026 by Moonshot AI.
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