Claude Opus 4.8 vs Kimi K2.5
Head to head on 28 shared benchmarks, with price, context window, and release dates.
Benchmark scores
51evals · sort by any column, ⤢ to expand fullscreen
| Model | ||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Claude Opus 4.8 Anthropic | 66.7% | 67.0% | 1835elo | 80.8 | 53.9% | 47.2% | 92.0% | 48.7% | 62.2% | 80.1% | 79.3% | 78.3% | 67.4% | 81.4% | 84.3% | 89.7% | 91.8% | 53.2% | 85.8% | 69.9% | 83.4% | 54.8% | 53.5% | 75.6% | 58.3% | 60.9% | 82.7% | 94.4% | - | 15.5% | 80.4% | 14.5% | 1281elo | 40.0% | 13.4% | 22.5% | 1890elo | 56.9% | - | - | - | 10.4% | - | 69.0% | - | - | - | 69.2% | 82.7% | - | 70.9% | 63.4% |
| Kimi K2.5 Moonshot AI | 68.3% | 39.0% | 1576elo | 74.9 | 35.8% | 27.9% | 78.9% | 13.2% | 43.7% | 72.5% | 77.9% | 61.4% | 57.4% | 77.7% | 84.9% | 76.0% | 62.0% | 39.3% | 76.4% | 66.5% | 63.3% | 49.9% | 39.6% | 74.2% | 18.9% | 26.3% | 17.5% | 81.3% | 96.1 | - | - | - | - | - | - | - | - | - | 95.4 | 78.5% | 10421 | - | 87.1 | - | 73 | 67.3% | 70.8% | - | - | 69.4 | - | 56.8% |
2 / 2 models
| Attribute | Claude Opus 4.8 Anthropic | Kimi K2.5 Moonshot AI |
|---|---|---|
| Description | Claude Opus 4.8 (Adaptive Reasoning, Max Effort) is an AI model from Anthropic. | Kimi K2.5 is an AI model from Kimi. |
| Family | Claude | Kimi |
| Params | - | - |
| Open weights | - | closed |
| License | - | Modified MIT |
| Released | 28 May 2026 | 27 Jan 2026 |
| Context | 1,000,000 | 262,144 |
| Input $/1M | $5.00 | $0.60 |
| Output $/1M | $25.00 | $3.00 |
| Cache read $/1M | $0.500 | $0.100 |
| Cache write $/1M | $6.250 | - |
| Speed | 0 tok/s | 0 tok/s |
| Latency | 0.00 s | 0.00 s |
| Modalities | text, image, file | text, image |
| Providers | - | - |
| Publisher | Anthropic | Moonshot AI |
| Reported scores | 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 Opus 4.8 or Kimi K2.5 better?
- Across the 28 benchmarks both models report on Sophon, Claude Opus 4.8 leads on 26 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
- How do Claude Opus 4.8 and Kimi K2.5 compare on GPQA Diamond?
- Claude Opus 4.8 scores 92.0% and Kimi K2.5 scores 78.9% on GPQA Diamond.
- Which is cheaper, Claude Opus 4.8 or Kimi K2.5?
- Kimi K2.5 is cheaper at $3.00 per million output tokens against $25.00 for Claude Opus 4.8 - about 8.3x.
- When were Claude Opus 4.8 and Kimi K2.5 released?
- Claude Opus 4.8 was released 28 May 2026 by Anthropic. Kimi K2.5 was released 27 Jan 2026 by Moonshot AI.
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