GLM 5.1 vs Grok 4.1 Fast
Head to head on 23 shared benchmarks, with price, context window, and release dates.
Benchmark scores
44evals · sort by any column, ⤢ to expand fullscreen
| Model | |||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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% | 4.0% | 44.2% | 73.1% | 24.2% | 1.2% | 93.3% | 62.0% | 89.3% | - | - | - | - | - | - | - | - | 11.8 | 35.0% | 80.2% | 82.2% | 100.0% | 42.6% | 31.3% | - | - | - | - | 58.3% |
| GLM 5.1 Zai | 64.5% | 1592elo | 73.5 | 86.8% | 30.1% | 76.3% | 72.7% | 75.4% | 63.2% | 68.5% | 71.8% | 84.9% | 72.5% | 67.0% | 41.6% | 72.3% | 85.4% | 22.2% | 44.8% | 71.2% | 43.2% | 31.5% | 97.7% | - | - | 20.8% | 35.9% | 1.13 | 35.0% | 44.8% | 33.5% | 34.7% | 15.1% | - | - | - | - | - | - | - | 34.6% | 5.24 | 69.8 | 52.5% | 55.0% |
2 / 2 models
| Attribute | GLM 5.1 Zai | Grok 4.1 Fast xAI |
|---|---|---|
| Description | GLM-5.1 is an AI model from Zai, released with open weights. | Grok 4.1 Fast is an AI model from xAI. |
| Family | Glm | Grok |
| Params | - | - |
| Open weights | open | closed |
| License | mit | proprietary |
| Released | 7 Apr 2026 | 19 Nov 2025 |
| Context | 204,800 | - |
| Input $/1M | $1.28 | - |
| Output $/1M | $4.07 | - |
| Cache read $/1M | $0.179 | - |
| Cache write $/1M | - | - |
| Speed | 0 tok/s | 0 tok/s |
| Latency | 0.00 s | 0.00 s |
| Modalities | text | text |
| Providers | - | - |
| Publisher | Zai | xAI |
| Reported scores | IFBench76.3% (AA) τ²-bench (Tau²-bench)97.7% (AA) Terminal-Bench (Hard)43.2% (AA) Vals Index52.5% Vibe Code Bench v1.131.5% | Infraresolutionbench80.2% (150 samples) Agent Diff Bench62.0% (179 samples) Medpt100.0% (15 samples) Hanabi11.8 (15 samples) SciCode44.2% (AA) |
FAQ
- Is GLM 5.1 or Grok 4.1 Fast better?
- Across the 23 benchmarks both models report on Sophon, GLM 5.1 leads on 17 of them. Which one is "better" depends on the benchmark - the table above shows every shared score.
- How do GLM 5.1 and Grok 4.1 Fast compare on GPQA Diamond?
- GLM 5.1 scores 86.8% and Grok 4.1 Fast scores 85.3% on GPQA Diamond.
- When were GLM 5.1 and Grok 4.1 Fast released?
- GLM 5.1 was released 7 Apr 2026 by Zai. Grok 4.1 Fast was released 19 Nov 2025 by xAI.
Other head-to-heads
56Gemini 3.1 Pro Preview vs GLM 5.132 shared evalsGLM 5.1 vs GPT-5.531 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 4.7 vs GLM 5.128 shared evalsClaude Opus 4.8 vs GLM 5.127 shared evalsClaude Opus 4.6 vs GLM 5.127 shared evalsGPT-5 Mini vs Grok 4.1 Fast26 shared evalsGLM 5.1 vs GPT-5.426 shared evalsGLM 5.1 vs Kimi K2.526 shared evalsDeepSeek V3.2 vs Grok 4.1 Fast26 shared evalsGLM 5.1 vs GPT-5 Mini25 shared evalsGPT-5.5 vs Grok 4.1 Fast25 shared evalsGemini 3.1 Pro Preview vs Grok 4.1 Fast25 shared evalsGLM 5.1 vs GPT-5.225 shared evalsClaude Fable 5 vs GLM 5.125 shared evalsClaude Opus 4.6 vs Grok 4.1 Fast25 shared evalsGPT-5.4 vs Grok 4.1 Fast25 shared evalsClaude Sonnet 4.6 vs GLM 5.125 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 evalsDeepSeek V3.2 vs GLM 5.124 shared evalsGLM 5.1 vs GPT-5.4 Mini24 shared evalsClaude Opus 4.7 vs Grok 4.1 Fast24 shared evalsGLM 4.7 vs Grok 4.1 Fast24 shared evalsClaude Sonnet 4.5 vs GLM 5.123 shared evalsClaude Opus 4.5 vs GLM 5.123 shared evalsClaude Fable 5 vs Grok 4.1 Fast23 shared evalsGLM 5.1 vs Qwen3.6 Plus23 shared evalsClaude Sonnet 4.6 vs Grok 4.1 Fast22 shared evalsGLM 4.7 vs GLM 5.122 shared evalsGemini 2.5 Pro vs Grok 4.1 Fast22 shared evalsGPT-5.4 Mini vs Grok 4.1 Fast22 shared evalsGLM 5.1 vs GPT-5 Nano21 shared evalsGrok 4.1 Fast vs Qwen3.6 Plus21 shared evalsGPT-5 vs Grok 4.1 Fast20 shared evalsClaude 4 Sonnet vs GLM 5.120 shared evalsgpt-oss-120b vs Grok 4.1 Fast20 shared evalsGemini 2.5 Pro vs GLM 5.119 shared evalsGLM 5.1 vs gpt-oss-120b19 shared evalsGLM 5.1 vs GPT-516 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 evalsGLM 5.1 vs GPT-6 Astra14 shared evalsGLM 5.1 vs GPT-4o14 shared evalsGPT-4.1 Nano vs Grok 4.1 Fast14 shared evalsGPT-4.1 vs Grok 4.1 Fast13 shared evalsGLM 5.1 vs GPT-4o-mini12 shared evalsGLM 5.1 vs GPT-4.1 Nano12 shared evalsGLM 5.1 vs GPT-4.1 Mini11 shared evalsGLM 5.1 vs GPT-4.111 shared evalsGPT-6 Astra vs Grok 4.1 Fast10 shared evals
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