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% | 1840elo | 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% | 62.0% | 1281elo | 40.0% | 53.9% | 13.4% | 47.2% | 22.5% | 1890elo | - | 56.9% | - | - | 10.4% | - | - | - | 83.4% | 69.2% | 82.7% | 55.1% | 70.9% | 63.1% |
| Grok 4.1 Fast xAI | 66.0% | 1327elo | 40.1 | 85.3% | 19.3% | 52.7% | 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% | 44.2% | 73.1% | 24.2% | 1.2% | 93.3% | 62.0% | 89.3% | - | - | - | - | - | - | - | - | - | - | - | 11.8 | - | 35.0% | 80.2% | - | 82.2% | 100.0% | 85.4% | - | - | - | - | - | 58.3% |
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) SciCode44.2% (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 85.3% 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.
Other head-to-heads
56Claude Opus 4.8 vs GPT-5.541 shared evalsClaude Fable 5 vs Claude Opus 4.840 shared evalsClaude Opus 4.8 vs Gemini 3.1 Pro Preview38 shared evalsGPT-5.2 vs Grok 4.1 Fast30 shared evalsClaude Opus 4.7 vs Claude Opus 4.830 shared evalsClaude Opus 4.8 vs Claude Sonnet 4.629 shared evalsClaude Opus 4.5 vs Grok 4.1 Fast29 shared evalsClaude Sonnet 4.5 vs Grok 4.1 Fast28 shared evalsClaude Opus 4.6 vs Claude Opus 4.828 shared evalsClaude Opus 4.8 vs GPT-5.428 shared evalsClaude Opus 4.8 vs Kimi K2.528 shared evalsClaude Opus 4.8 vs GLM 5.127 shared evalsGPT-5 Mini vs Grok 4.1 Fast26 shared evalsClaude Opus 4.8 vs GPT-5.226 shared evalsClaude Opus 4.8 vs GPT-5.4 Mini26 shared evalsDeepSeek V3.2 vs Grok 4.1 Fast26 shared evalsClaude Opus 4.8 vs Claude Sonnet 4.525 shared evalsGPT-5.5 vs Grok 4.1 Fast25 shared evalsGemini 3.1 Pro Preview vs Grok 4.1 Fast25 shared evalsClaude Opus 4.8 vs Qwen3.6 Plus25 shared evalsClaude Opus 4.6 vs Grok 4.1 Fast25 shared evalsGPT-5.4 vs Grok 4.1 Fast25 shared evalsClaude Opus 4.8 vs GPT-5 Mini24 shared evalsGPT-5 Nano vs Grok 4.1 Fast24 shared evalsClaude Opus 4.5 vs Claude Opus 4.824 shared evalsClaude 4 Sonnet vs Grok 4.1 Fast24 shared evalsGrok 4.1 Fast vs Kimi K2.524 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 evalsGLM 5.1 vs Grok 4.1 Fast23 shared evalsClaude Opus 4.8 vs GPT-5 Nano22 shared evalsClaude 4 Sonnet vs Claude Opus 4.822 shared evalsClaude Opus 4.8 vs DeepSeek V3.222 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 evalsClaude Opus 4.8 vs GLM 4.721 shared evalsGrok 4.1 Fast vs Qwen3.6 Plus21 shared evalsGPT-5 vs Grok 4.1 Fast20 shared evalsClaude Opus 4.8 vs Gemini 2.5 Pro20 shared evalsgpt-oss-120b vs Grok 4.1 Fast20 shared evalsClaude Opus 4.8 vs GPT-6 Astra19 shared evalsClaude Opus 4.8 vs gpt-oss-120b18 shared evalsClaude Opus 4.8 vs GPT-517 shared evalsGPT-4o vs Grok 4.1 Fast16 shared evalsGPT-4o-mini vs Grok 4.1 Fast15 shared evalsGPT-4.1 Mini vs Grok 4.1 Fast14 shared evalsClaude Opus 4.8 vs GPT-4o14 shared evalsGPT-4.1 Nano vs Grok 4.1 Fast14 shared evalsGPT-4.1 vs Grok 4.1 Fast13 shared evalsClaude Opus 4.8 vs GPT-4o-mini12 shared evalsClaude Opus 4.8 vs GPT-4.1 Nano12 shared evalsClaude Opus 4.8 vs GPT-4.1 Mini11 shared evalsClaude Opus 4.8 vs GPT-4.111 shared evalsGPT-6 Astra vs Grok 4.1 Fast10 shared evals
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