GPT-5.1-Codex vs o4-mini
OpenAI vs OpenAI — benchmarks, pricing, and capabilities side by side.
- •GPT-5.1-Codex has the higher intelligence index (88.2 vs 78.4)
- •o4-mini is cheaper ($1.10 vs $1.25 per 1M input)
- •GPT-5.1-Codex is faster
- •GPT-5.1-Codex has a larger context window (400K)
| GPT-5.1-Codex | o4-mini | |
|---|---|---|
| Intelligence index | 88.2 | 78.4 |
| Developer | OpenAI | OpenAI |
| Type | Multimodal | Multimodal |
| Access | API only | API only |
| Context window | 400,000 tokens | 200,000 tokens |
| Input price | $1.25 / 1M | $1.10 / 1M |
| Output price | $10.00 / 1M | $4.40 / 1M |
| Speed | 188 tok/s | 115 tok/s |
| Released | November 13, 2025 | April 16, 2025 |
| Parameters | — | — |
| Input modalities | Text, Image | Text, Image |
| Output modalities | Text | Text |
Shared benchmarks
GPT-5.1-Codex
o4-mini
AIME 2025
95.7
92.7
GPQA Diamond
86
81.4
Humanity’s Last Exam
23.4
14.7
LiveCodeBench
84.9
85.9
MMLU-Pro
86
83.2