GPT-5.1 vs Grok 4
OpenAI vs xAI — benchmarks, pricing, and capabilities side by side.
- •GPT-5.1 has the higher intelligence index (89 vs 78.2)
- •GPT-5.1 is cheaper ($1.25 vs $3.00 per 1M input)
- •GPT-5.1 is faster
- •GPT-5.1 has a larger context window (400K)
| GPT-5.1 | Grok 4 | |
|---|---|---|
| Intelligence index | 89 | 78.2 |
| Developer | OpenAI | xAI |
| Type | LLM | LLM |
| Access | API only | API only |
| Context window | 400,000 tokens | 256,000 tokens |
| Input price | $1.25 / 1M | $3.00 / 1M |
| Output price | $10.00 / 1M | $15.00 / 1M |
| Speed | 115 tok/s | 100 tok/s |
| Released | November 12, 2025 | July 9, 2025 |
| Parameters | — | — |
| Input modalities | Text, Image | Text, Image |
| Output modalities | Text | Text |
Shared benchmarks
GPT-5.1
Grok 4
AIME 2025
94
91.7
GPQA Diamond
88.1
87.5
Humanity’s Last Exam
26.5
40
LiveCodeBench
86.8
79
MMLU-Pro
87
86.6