GPT-4o-mini vs GPT-5.1-Codex
OpenAI vs OpenAI — benchmarks, pricing, and capabilities side by side.
- •GPT-5.1-Codex has the higher intelligence index (88.2 vs 49.1)
- •GPT-4o-mini is cheaper ($0.15 vs $1.25 per 1M input)
- •GPT-5.1-Codex is faster
- •GPT-5.1-Codex has a larger context window (400K)
| GPT-4o-mini | GPT-5.1-Codex | |
|---|---|---|
| Intelligence index | 49.1 | 88.2 |
| Developer | OpenAI | OpenAI |
| Type | Multimodal | Multimodal |
| Access | API only | API only |
| Context window | 128,000 tokens | 400,000 tokens |
| Input price | $0.15 / 1M | $1.25 / 1M |
| Output price | $0.60 / 1M | $10.00 / 1M |
| Speed | 92 tok/s | 188 tok/s |
| Released | July 18, 2024 | November 13, 2025 |
| Parameters | — | — |
| Input modalities | Text, Image | Text, Image |
| Output modalities | Text | Text |
Shared benchmarks
GPT-4o-mini
GPT-5.1-Codex
AIME 2025
14.7
95.7
GPQA Diamond
40.2
86
Humanity’s Last Exam
4
23.4
LiveCodeBench
23.4
84.9
MMLU-Pro
64.8
86