GPT-5.1-Codex-Mini vs GPT-5 Codex
OpenAI vs OpenAI — benchmarks, pricing, and capabilities side by side.
- •GPT-5 Codex has the higher intelligence index (87.1 vs 84.7)
- •GPT-5.1-Codex-Mini is cheaper ($0.25 vs $1.25 per 1M input)
- •GPT-5 Codex is faster
| GPT-5.1-Codex-Mini | GPT-5 Codex | |
|---|---|---|
| Intelligence index | 84.7 | 87.1 |
| Developer | OpenAI | OpenAI |
| Type | Multimodal | Multimodal |
| Access | API only | API only |
| Context window | 400,000 tokens | 400,000 tokens |
| Input price | $0.25 / 1M | $1.25 / 1M |
| Output price | $2.00 / 1M | $10.00 / 1M |
| Speed | 175 tok/s | 180 tok/s |
| Released | November 13, 2025 | September 23, 2025 |
| Parameters | — | — |
| Input modalities | Image, Text | Text, Image |
| Output modalities | Text | Text |
Shared benchmarks
GPT-5.1-Codex-Mini
GPT-5 Codex
AIME 2025
91.7
98.7
GPQA Diamond
81.3
83.7
Humanity’s Last Exam
16.9
25.6
LiveCodeBench
83.6
84
MMLU-Pro
82
86.5