# GPT-5 Codex vs Codestral (2026): Benchmarks, Price & Verdict | Alher Tech

> GPT-5 Codex vs Codestral: head-to-head 2026 comparison across Arena Elo, MMLU, GPQA, HumanEval, context window and pricing. Verdict + use cases.

- Canonical page: https://alhertech.com/en/ai-comparison/gpt-5-codex-vs-codestral/
- Site: Alher Tech (custom software, AI agents and SEO engineering, https://alhertech.com/)
- Contact: https://alhertech.com/en/contact/

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|  | GPT-5 Codex | Codestral |
| --- | --- | --- |
| arenaElo | 1395 | 1254 |
| humanEval | 94.8 | 89.7 |
| sweBench | 68 | 35 |
| mmlu | 87.2 | 73.2 |
| gpqa | 58.4 | 41 |
| aime | 85 | 30 |
| Price in/out ($/M) | $8 / $32 | $0.3 / $0.9 |

## Our verdict

Codestral is 25× cheaper and still clears 89% HumanEval, remarkable for inline autocomplete and refactors. GPT-5 Codex wins on agentic coding, multi-file edits and reasoning about unfamiliar code. Mix them: Codestral for suggestions, Codex for agents.

[GPT-5 Codex](https://alhertech.com/en/ai-comparison/gpt-5-codex/) · [Codestral](https://alhertech.com/en/ai-comparison/codestral/) · [All AI model comparisons](https://alhertech.com/en/ai-comparison/)