Claude Opus 4.8 vs Grok 4.1 Fast
Head to head on 24 shared benchmarks, with price, context window, and release dates.
Benchmark scores
50evals · sort by any column, ⤢ to expand fullscreen
| Model | |||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Claude Opus 4.8 Anthropic | 66.7% | 1835elo | 80.8 | 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% | 69.0% | 54.8% | 53.5% | 75.6% | 58.3% | 82.7% | 94.4% | - | - | 15.5% | 80.4% | 14.5% | 67.0% | 1281elo | 40.0% | 53.9% | 13.4% | 47.2% | 22.5% | 1890elo | - | 56.9% | - | - | 10.4% | - | - | - | 83.4% | 69.2% | 82.7% | 60.9% | 70.9% | 63.4% |
| Grok 4.1 Fast xAI | 66.0% | 1324elo | 40.1 | 63.7% | 5.1% | 36.5% | 64.7% | 69.6% | 52.2% | 28.2% | 74.3% | 83.7% | 80.2% | 60.8% | 28.1% | 78.7% | 42.6% | 4.0% | 31.3% | 29.6% | 73.1% | 14.4% | 1.2% | 63.7% | 62.0% | 34.3% | - | - | - | - | - | - | - | - | - | - | - | 11.8 | - | 35.0% | 80.2% | - | 39.9% | 100.0% | 74.3% | - | - | - | - | - | 51.0% |
2 / 2 models
| Attribute | Claude Opus 4.8 Anthropic | Grok 4.1 Fast xAI |
|---|---|---|
| Description | Claude Opus 4.8 (Adaptive Reasoning, Max Effort) is an AI model from Anthropic. | Grok 4.1 Fast is an AI model from xAI. |
| Family | Claude | Grok |
| Params | - | - |
| Open weights | - | closed |
| License | - | proprietary |
| Released | 28 May 2026 | 19 Nov 2025 |
| Context | 1,000,000 | - |
| 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 | text, image, file | 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 4.8 or Grok 4.1 Fast better?
- Across the 24 benchmarks both models report on Sophon, Claude Opus 4.8 leads on 24 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
- How do Claude Opus 4.8 and Grok 4.1 Fast compare on GPQA Diamond?
- Claude Opus 4.8 scores 92.0% and Grok 4.1 Fast scores 63.7% on GPQA Diamond.
- When were Claude Opus 4.8 and Grok 4.1 Fast released?
- Claude Opus 4.8 was released 28 May 2026 by Anthropic. Grok 4.1 Fast was released 19 Nov 2025 by xAI.
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