GPT-5 Codex vs Mistral Small 4
OpenAI vs Mistral AI — benchmarks, pricing, and capabilities side by side.
- •GPT-5 Codex has the higher intelligence index (87.1 vs 76.9)
- •Mistral Small 4 is cheaper ($0.15 vs $1.25 per 1M input)
- •GPT-5 Codex is faster
- •GPT-5 Codex has a larger context window (400K)
| GPT-5 Codex | Mistral Small 4 | |
|---|---|---|
| Intelligence index | 87.1 | 76.9 |
| Developer | OpenAI | Mistral AI |
| Type | Multimodal | Multimodal |
| Access | API only | Open weights |
| Context window | 400,000 tokens | 262,144 tokens |
| Input price | $1.25 / 1M | $0.15 / 1M |
| Output price | $10.00 / 1M | $0.60 / 1M |
| Speed | 180 tok/s | 145 tok/s |
| Released | September 23, 2025 | March 16, 2026 |
| Parameters | — | — |
| Input modalities | Text, Image | Text, Image |
| Output modalities | Text | Text |
Shared benchmarks
GPT-5 Codex
Mistral Small 4
GPQA Diamond
83.7
76.9
Humanity’s Last Exam
25.6
9.5