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% | 1579elo | 74.9 | 87.9% | 30.7% | 70.2% | 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% | 49.0% | 74.2% | 34.8% | 17.5% | 95.9% | - | - | 96.1 | 35.0% | 35.8% | 27.9% | - | 95.4 | - | 10421 | - | - | 87.1 | - | 63.3% | - | 73 | 67.3% | 70.8% | 69.4 | 26.3% | 59.8% |
| Grok 4.1 Fast xAI | 66.0% | 1327elo | 40.1 | 85.3% | 19.3% | 52.7% | 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% | 44.2% | 73.1% | 24.2% | 1.2% | 93.3% | 62.0% | 89.3% | - | - | - | - | 11.8 | - | 35.0% | - | 82.2% | 100.0% | - | 85.4% | - | 4.0% | - | - | - | - | - | 58.3% |
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 | open |
| License | proprietary | Modified MIT |
| Released | 19 Nov 2025 | 27 Jan 2026 |
| Context | - | 262,144 |
| Input $/1M | - | $0.60 |
| Output $/1M | - | $2.75 |
| Cache read $/1M | - | $0.150 |
| 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) SciCode44.2% (AA) | 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 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 85.3% and Kimi K2.5 scores 87.9% 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.
Other head-to-heads
56Claude Opus 4.6 vs Kimi K2.531 shared evalsGemini 3.1 Pro Preview vs Kimi K2.530 shared evalsGPT-5.2 vs Grok 4.1 Fast30 shared evalsGPT-5.2 vs Kimi K2.529 shared evalsClaude Opus 4.5 vs Grok 4.1 Fast29 shared evalsKimi K2.5 vs Qwen3.6 Plus29 shared evalsClaude Sonnet 4.5 vs Kimi K2.528 shared evalsClaude Sonnet 4.5 vs Grok 4.1 Fast28 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-5 Mini vs Grok 4.1 Fast26 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 evalsDeepSeek V3.2 vs Grok 4.1 Fast26 shared evalsGPT-5 Mini vs Kimi K2.525 shared evalsGPT-5.5 vs Grok 4.1 Fast25 shared evalsGemini 3.1 Pro Preview vs Grok 4.1 Fast25 shared evalsClaude Opus 4.6 vs Grok 4.1 Fast25 shared evalsGPT-5.4 vs Grok 4.1 Fast25 shared evalsDeepSeek V3.2 vs Kimi K2.525 shared evalsGPT-5.4 Mini vs Kimi K2.525 shared evalsGPT-5 Nano vs Grok 4.1 Fast24 shared evalsClaude Opus 4.8 vs Grok 4.1 Fast24 shared evalsClaude 4 Sonnet vs Grok 4.1 Fast24 shared evalsClaude Opus 4.7 vs Grok 4.1 Fast24 shared evalsGLM 4.7 vs Grok 4.1 Fast24 shared evalsClaude Fable 5 vs Grok 4.1 Fast23 shared evalsClaude 4 Sonnet vs Kimi K2.523 shared evalsGLM 5.1 vs Grok 4.1 Fast23 shared evalsGPT-5 Nano vs Kimi K2.522 shared evalsClaude Sonnet 4.6 vs Grok 4.1 Fast22 shared evalsGemini 2.5 Pro vs Grok 4.1 Fast22 shared evalsGPT-5.4 Mini vs Grok 4.1 Fast22 shared evalsGemini 2.5 Pro vs Kimi K2.521 shared evalsGrok 4.1 Fast vs Qwen3.6 Plus21 shared evalsGPT-5 vs Grok 4.1 Fast20 shared evalsGLM 4.7 vs Kimi K2.520 shared evalsgpt-oss-120b vs Grok 4.1 Fast20 shared evalsgpt-oss-120b vs Kimi K2.519 shared evalsGPT-5 vs Kimi K2.518 shared evalsGPT-4o vs Grok 4.1 Fast16 shared evalsGPT-4o vs Kimi K2.515 shared evalsGPT-4o-mini vs Grok 4.1 Fast15 shared evalsGPT-4.1 Mini vs Grok 4.1 Fast14 shared evalsGPT-4.1 Nano vs Grok 4.1 Fast14 shared evalsGPT-4.1 vs Grok 4.1 Fast13 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-6 Astra vs Grok 4.1 Fast10 shared evals
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