GPT-5.1-Codex vs GPT-5 Codex
OpenAI vs OpenAI — benchmarks, pricing, and capabilities side by side.
- •GPT-5.1-Codex has the higher intelligence index (88.2 vs 87.1)
- •GPT-5.1-Codex is faster
| GPT-5.1-Codex | GPT-5 Codex | |
|---|---|---|
| Intelligence index | 88.2 | 87.1 |
| Developer | OpenAI | OpenAI |
| Type | Multimodal | Multimodal |
| Access | API only | API only |
| Context window | 400,000 tokens | 400,000 tokens |
| Input price | $1.25 / 1M | $1.25 / 1M |
| Output price | $10.00 / 1M | $10.00 / 1M |
| Speed | 188 tok/s | 180 tok/s |
| Released | November 13, 2025 | September 23, 2025 |
| Parameters | — | — |
| Input modalities | Text, Image | Text, Image |
| Output modalities | Text | Text |
Shared benchmarks
GPT-5.1-Codex
GPT-5 Codex
AIME 2025
95.7
98.7
GPQA Diamond
86
83.7
Humanity’s Last Exam
23.4
25.6
LiveCodeBench
84.9
84
MMLU-Pro
86
86.5