Claude Sonnet 4.5 vs Grok 4.1 Fast
Head to head on 28 shared benchmarks, with price, context window, and release dates.
Benchmark scores
86evals · sort by any column, ⤢ to expand fullscreen
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| Grok 4.1 Fast xAI | 34.3% | 66.0% | 1324elo | 40.1 | 63.7% | 5.1% | 35.0% | 36.5% | 80.2% | 64.7% | 69.6% | 52.2% | 28.2% | 74.3% | 83.7% | 80.2% | 39.9% | 28.1% | 78.7% | 74.3% | 42.6% | 4.0% | 31.3% | 29.6% | 73.1% | 14.4% | 1.2% | 63.7% | - | 62.0% | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 11.8 | - | - | - | - | - | - | - | 60.8% | - | 100.0% | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 51.0% |
| Claude Sonnet 4.5 Anthropic | 37.0% | 60.8% | 1675elo | 71.4 | 72.7% | 7.2% | 87.5% | 42.7% | 83.8% | 70.7% | 80.4% | 57.0% | 53.4% | 76.5% | 79.3% | 77.6% | 59.0% | 40.6% | 84.5% | 86.0% | 64.0% | 19.0% | 32.9% | 42.8% | 73.3% | 28.8% | 22.6% | 70.5% | 0.0% | - | 0.0% | 100 | 0.0% | 0.0% | 0.0% | 5.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 15.2% | 0.0% | 0.0% | 83.9% | 0.0% | 0.0% | 0.0% | - | 0.0% | 0.0% | 0.0% | 0.0% | 0.75 | 0.75 | 0.0% | - | 0 | - | 0 | 0.0% | 0.0% | 62.9% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0.0% | 0 | 0.0% | 0.0% | 77.2% | 67.0% | 74.8% | 0.0% | 0 | 0 | 50.34 | 0 | 0.0% | 1.49 | 27.5% |
2 / 2 models
| Attribute | Claude Sonnet 4.5 Anthropic | Grok 4.1 Fast xAI |
|---|---|---|
| Description | anthropic/claude-sonnet-4.5 is an AI model. | Grok 4.1 Fast is an AI model from xAI. |
| Family | Claude | Grok |
| Params | Undisclosed (closed) | - |
| Open weights | closed | closed |
| License | Proprietary | proprietary |
| Released | 29 Sep 2025 | 19 Nov 2025 |
| Context | 1,000,000 | - |
| Input $/1M | $3.00 | - |
| Output $/1M | $15.00 | - |
| Cache read $/1M | $0.300 | - |
| Cache write $/1M | $3.750 | - |
| Speed | 0 tok/s | 0 tok/s |
| Latency | 0.00 s | 0.00 s |
| Modalities | text, image, file | text |
| Providers | anthropic, aws-bedrock, vertex-ai | - |
| Publisher | Anthropic | xAI |
| Reported scores | TaxEval v273.3% LiveBench - Math79.3% (LiveBench) LiveBench - Coding80.4% (LiveBench) LiveBench - Language76.5% (LiveBench) LiveBench - Data Analysis57.0% (LiveBench) | Infraresolutionbench80.2% (150 samples) Agent Diff Bench62.0% (179 samples) Medpt100.0% (15 samples) Hanabi11.8 (15 samples) SciCode29.6% (AA) |
FAQ
- Is Claude Sonnet 4.5 or Grok 4.1 Fast better?
- Across the 28 benchmarks both models report on Sophon, Claude Sonnet 4.5 leads on 25 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
- How do Claude Sonnet 4.5 and Grok 4.1 Fast compare on GPQA Diamond?
- Claude Sonnet 4.5 scores 72.7% and Grok 4.1 Fast scores 63.7% on GPQA Diamond.
- When were Claude Sonnet 4.5 and Grok 4.1 Fast released?
- Claude Sonnet 4.5 was released 29 Sep 2025 by Anthropic. Grok 4.1 Fast was released 19 Nov 2025 by xAI.
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