GPT-5 Codex vs Mistral Medium 3
OpenAI vs Mistral AI — benchmarks, pricing, and capabilities side by side.
- •GPT-5 Codex has the higher intelligence index (87.1 vs 58.6)
- •Mistral Medium 3 is cheaper ($0.40 vs $1.25 per 1M input)
- •GPT-5 Codex is faster
- •GPT-5 Codex has a larger context window (400K)
| GPT-5 Codex | Mistral Medium 3 | |
|---|---|---|
| Intelligence index | 87.1 | 58.6 |
| Developer | OpenAI | Mistral AI |
| Type | Multimodal | Multimodal |
| Access | API only | API only |
| Context window | 400,000 tokens | 131,072 tokens |
| Input price | $1.25 / 1M | $0.40 / 1M |
| Output price | $10.00 / 1M | $2.00 / 1M |
| Speed | 180 tok/s | 32 tok/s |
| Released | September 23, 2025 | May 7, 2025 |
| Parameters | — | — |
| Input modalities | Text, Image | Text, Image |
| Output modalities | Text | Text |
Shared benchmarks
GPT-5 Codex
Mistral Medium 3
AIME 2025
98.7
30.3
GPQA Diamond
83.7
57.8
Humanity’s Last Exam
25.6
4.3
LiveCodeBench
84
40
MMLU-Pro
86.5
76