Grok 4.1 Fast vs Kimi K2.5
Head to head on 24 shared benchmarks, with price, context window, and release dates.
Benchmark scores
45evals · sort by any column, ⤢ to expand fullscreen
| Model | ||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Kimi K2.5 Moonshot AI | 68.3% | 1576elo | 74.9 | 78.9% | 13.2% | 43.7% | 78.5% | 72.5% | 77.9% | 61.4% | 57.4% | 77.7% | 84.9% | 76.0% | 62.0% | 39.3% | 76.4% | 66.5% | 49.9% | 39.6% | 74.2% | 18.9% | 17.5% | 81.3% | - | - | 96.1 | 39.0% | 35.8% | 27.9% | - | 95.4 | - | 10421 | - | - | 87.1 | - | 63.3% | - | 73 | 67.3% | 70.8% | 69.4 | 26.3% | 56.8% |
| Grok 4.1 Fast xAI | 66.0% | 1324elo | 40.1 | 63.7% | 5.1% | 36.5% | 80.2% | 64.7% | 69.6% | 52.2% | 28.2% | 74.3% | 83.7% | 80.2% | 60.8% | 28.1% | 78.7% | 42.6% | 31.3% | 29.6% | 73.1% | 14.4% | 1.2% | 63.7% | 62.0% | 34.3% | - | - | - | - | 11.8 | - | 35.0% | - | 39.9% | 100.0% | - | 74.3% | - | 4.0% | - | - | - | - | - | 51.0% |
2 / 2 models
| Attribute | Grok 4.1 Fast xAI | Kimi K2.5 Moonshot AI |
|---|---|---|
| Description | Grok 4.1 Fast is an AI model from xAI. | Kimi K2.5 is an AI model from Kimi. |
| Family | Grok | Kimi |
| Params | - | - |
| Open weights | closed | closed |
| License | proprietary | Modified MIT |
| Released | 19 Nov 2025 | 27 Jan 2026 |
| Context | - | 262,144 |
| Input $/1M | - | $0.60 |
| Output $/1M | - | $3.00 |
| Cache read $/1M | - | $0.100 |
| Cache write $/1M | - | - |
| Speed | 0 tok/s | 0 tok/s |
| Latency | 0.00 s | 0.00 s |
| Modalities | text | text, image |
| Providers | - | - |
| Publisher | xAI | Moonshot AI |
| Reported scores | Infraresolutionbench80.2% (150 samples) Agent Diff Bench62.0% (179 samples) Medpt100.0% (15 samples) Hanabi11.8 (15 samples) SciCode29.6% (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 Grok 4.1 Fast or Kimi K2.5 better?
- Across the 24 benchmarks both models report on Sophon, Kimi K2.5 leads on 21 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
- How do Grok 4.1 Fast and Kimi K2.5 compare on GPQA Diamond?
- Grok 4.1 Fast scores 63.7% and Kimi K2.5 scores 78.9% on GPQA Diamond.
- When were Grok 4.1 Fast and Kimi K2.5 released?
- Grok 4.1 Fast was released 19 Nov 2025 by xAI. Kimi K2.5 was released 27 Jan 2026 by Moonshot AI.
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