GPT-5.5 vs Grok 4.1 Fast
Head to head on 25 shared benchmarks, with price, context window, and release dates.
Benchmark scores
59evals · sort by any column, ⤢ to expand fullscreen
| Model | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| GPT-5.5 OpenAI | 68.4% | 1844elo | 78.2 | 93.5% | 45.8% | 75.9% | 84.7% | 82.5% | 81.1% | 73.0% | 87.7% | 96.3% | 87.7% | 92.8% | 49.1% | 86.9% | 88.6% | 68.8% | 50.0% | 51.5% | 55.8% | 75.0% | 60.6% | 69.8% | 93.9% | - | - | 86.2% | 54.2% | 12.9% | 36.2% | 83.0% | 90.0% | 100.0% | 1315elo | 34.0% | 51.8% | 5.7% | 51.7% | 44.8% | 24.9% | 1769elo | 15.1% | - | 51.8% | - | - | 2.1% | - | - | 78.7% | 45.3% | 100.0% | 4.2 | 58.6% | 75.7% | 83.4% | 57.4% | 68.1% | 64.5% |
| 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% | 85.4% | 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% | - | - | - | - | - | - | - | - | - | 58.3% |
2 / 2 models
| Attribute | GPT-5.5 OpenAI | Grok 4.1 Fast xAI |
|---|---|---|
| Description | GPT-5.5 is an AI model from OpenAI. | Grok 4.1 Fast is an AI model from xAI. |
| Family | GPT | Grok |
| Params | - | - |
| Open weights | closed | closed |
| License | proprietary | proprietary |
| Released | 23 Apr 2026 | 19 Nov 2025 |
| Context | 1,050,000 | - |
| Input $/1M | $5.00 | - |
| Output $/1M | $30.00 | - |
| Cache read $/1M | $0.500 | - |
| Cache write $/1M | - | - |
| Speed | 0 tok/s | 0 tok/s |
| Latency | 0.00 s | 0.00 s |
| Modalities | file, image, text | text |
| Providers | - | - |
| Publisher | OpenAI | xAI |
| Reported scores | GPQA Diamond93.5% (AA) Humanity's Last Exam (HLE)45.8% (AA) IFBench75.9% (AA) SciCode55.8% (AA) τ²-bench (Tau²-bench)93.9% (AA) | Infraresolutionbench80.2% (150 samples) Agent Diff Bench62.0% (179 samples) Medpt100.0% (15 samples) Hanabi11.8 (15 samples) SciCode44.2% (AA) |
FAQ
- Is GPT-5.5 or Grok 4.1 Fast better?
- Across the 25 benchmarks both models report on Sophon, GPT-5.5 leads on 25 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
- How do GPT-5.5 and Grok 4.1 Fast compare on GPQA Diamond?
- GPT-5.5 scores 93.5% and Grok 4.1 Fast scores 85.3% on GPQA Diamond.
- When were GPT-5.5 and Grok 4.1 Fast released?
- GPT-5.5 was released 23 Apr 2026 by OpenAI. Grok 4.1 Fast was released 19 Nov 2025 by xAI.
Other head-to-heads
56Gemini 3.1 Pro Preview vs GPT-5.541 shared evalsClaude Opus 4.8 vs GPT-5.541 shared evalsClaude Fable 5 vs GPT-5.539 shared evalsClaude Opus 4.7 vs GPT-5.532 shared evalsGLM 5.1 vs GPT-5.531 shared evalsClaude Sonnet 4.6 vs GPT-5.530 shared evalsGPT-5.2 vs Grok 4.1 Fast30 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 GPT-5.528 shared evalsGPT-5.4 vs GPT-5.528 shared evalsGPT-5.5 vs Kimi K2.528 shared evalsGPT-5.2 vs GPT-5.527 shared evalsClaude Sonnet 4.5 vs GPT-5.526 shared evalsGPT-5 Mini vs Grok 4.1 Fast26 shared evalsGPT-5.4 Mini vs GPT-5.526 shared evalsDeepSeek V3.2 vs Grok 4.1 Fast26 shared evalsGPT-5 Mini vs GPT-5.525 shared evalsClaude Opus 4.5 vs GPT-5.525 shared evalsGPT-5.5 vs Qwen3.6 Plus25 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 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 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 evalsGPT-5 Nano vs GPT-5.523 shared evalsClaude 4 Sonnet vs GPT-5.523 shared evalsDeepSeek V3.2 vs GPT-5.523 shared evalsClaude Fable 5 vs Grok 4.1 Fast23 shared evalsGLM 5.1 vs Grok 4.1 Fast23 shared evalsGemini 2.5 Pro vs GPT-5.522 shared evalsGLM 4.7 vs GPT-5.522 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 evalsGrok 4.1 Fast vs Qwen3.6 Plus21 shared evalsGPT-5 vs Grok 4.1 Fast20 shared evalsgpt-oss-120b vs Grok 4.1 Fast20 shared evalsGPT-5.5 vs GPT-6 Astra19 shared evalsGPT-5.5 vs gpt-oss-120b19 shared evalsGPT-5 vs GPT-5.518 shared evalsGPT-4o vs Grok 4.1 Fast16 shared evalsGPT-4o vs GPT-5.515 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 Mini vs GPT-5.513 shared evalsGPT-4o-mini vs GPT-5.513 shared evalsGPT-4.1 Nano vs GPT-5.513 shared evalsGPT-4.1 vs Grok 4.1 Fast13 shared evalsGPT-4.1 vs GPT-5.512 shared evalsGPT-6 Astra vs Grok 4.1 Fast10 shared evals
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