Claude Opus 4.5 vs Grok 4.1 Fast
Head to head on 29 shared benchmarks, with price, context window, and release dates.
Benchmark scores
44evals · sort by any column, ⤢ to expand fullscreen
| Model | |||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Claude Opus 4.5 Anthropic | 62.7% | 61.3% | 1683elo | 73.1 | 81.0% | 12.13 | 13.2% | 83.8% | 43.0% | 83.5% | 78.1% | 79.7% | 74.4% | 62.5% | 81.3% | 90.4% | 80.1% | 73.8% | 45.2% | 83.2% | 88.9% | 68.7% | 36.0% | 45.0% | 47.0% | 74.3% | 40.9% | 20.6% | 86.3% | - | 16.7% | 35.6% | 6.1% | 20.7% | 84.7% | - | - | 100.0% | 37.4 | 77.5% | 45.3 | 70.7% | 79.2% | 61.8 | 62.2% |
| Grok 4.1 Fast xAI | 34.3% | 66.0% | 1324elo | 40.1 | 63.7% | 11.8 | 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% | - | - | - | - | - | 60.8% | 100.0% | - | - | - | - | - | - | - | 51.0% |
2 / 2 models
| Attribute | Claude Opus 4.5 Anthropic | Grok 4.1 Fast xAI |
|---|---|---|
| Description | Claude Opus 4.5 is an AI model from Anthropic. | Grok 4.1 Fast is an AI model from xAI. |
| Family | Claude | Grok |
| Params | - | - |
| Open weights | closed | closed |
| License | proprietary | proprietary |
| Released | 24 Nov 2025 | 19 Nov 2025 |
| Context | 200,000 | - |
| Input $/1M | $5.00 | - |
| Output $/1M | $25.00 | - |
| Cache read $/1M | $0.500 | - |
| Cache write $/1M | $6.250 | - |
| Speed | 0 tok/s | 0 tok/s |
| Latency | 0.00 s | 0.00 s |
| Modalities | file, image, text | text |
| Providers | - | - |
| Publisher | Anthropic | xAI |
| Reported scores | Infraresolutionbench80.2% (150 samples) Agent Diff Bench62.0% (179 samples) Medpt100.0% (15 samples) Hanabi11.8 (15 samples) SciCode29.6% (AA) |
FAQ
- Is Claude Opus 4.5 or Grok 4.1 Fast better?
- Across the 29 benchmarks both models report on Sophon, Claude Opus 4.5 leads on 27 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
- How do Claude Opus 4.5 and Grok 4.1 Fast compare on GPQA Diamond?
- Claude Opus 4.5 scores 81.0% and Grok 4.1 Fast scores 63.7% on GPQA Diamond.
- When were Claude Opus 4.5 and Grok 4.1 Fast released?
- Claude Opus 4.5 was released 24 Nov 2025 by Anthropic. Grok 4.1 Fast was released 19 Nov 2025 by xAI.
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