GPT-5.1 vs Grok Code Fast 1
OpenAI vs xAI — benchmarks, pricing, and capabilities side by side.
- •GPT-5.1 has the higher intelligence index (89 vs 65.3)
- •Grok Code Fast 1 is cheaper ($0.00 vs $1.25 per 1M input)
| GPT-5.1 | Grok Code Fast 1 | |
|---|---|---|
| Intelligence index | 89 | 65.3 |
| Developer | OpenAI | xAI |
| Type | LLM | LLM |
| Access | API only | — |
| Context window | 400,000 tokens | — |
| Input price | $1.25 / 1M | $0.00 / 1M |
| Output price | $10.00 / 1M | $0.00 / 1M |
| Speed | 115 tok/s | — |
| Released | November 12, 2025 | August 28, 2025 |
| Parameters | — | — |
| Input modalities | Text, Image | — |
| Output modalities | Text | — |
Shared benchmarks
GPT-5.1
Grok Code Fast 1
AIME 2025
94
43.3
GPQA Diamond
88.1
72.7
Humanity’s Last Exam
26.5
7.5
LiveCodeBench
86.8
65.7
MMLU-Pro
87
79.3