# GPT-5.4 Codex vs GPT-5 Codex (2026): Benchmarks, Price & Verdict | Alher Tech

> GPT-5.4 Codex vs GPT-5 Codex: 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-5-4-codex-vs-gpt-5-codex/
- Site: Alher Tech (custom software, AI agents and SEO engineering, https://alhertech.com/)
- Contact: https://alhertech.com/en/contact/

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|  | GPT-5.4 Codex | GPT-5 Codex |
| --- | --- | --- |
| arenaElo | 1408 | 1395 |
| humanEval | 95.5 | 94.8 |
| sweBench | 70 | 68 |
| mmlu | 88.6 | 87.2 |
| gpqa | 60.8 | 58.4 |
| aime | 86 | 85 |
| Price in/out ($/M) | $9 / $36 | $8 / $32 |

## Our verdict

5.4 Codex gains ~0.7 HumanEval points, a 100K bigger context and ~2 extra GPQA points over 5 Codex, at ~12% more cost. For high-stakes automated PR pipelines, worth the bump. For routine autocomplete, 5 Codex still wins on price.

[GPT-5.4 Codex](https://alhertech.com/en/ai-comparison/gpt-5-4-codex/) · [GPT-5 Codex](https://alhertech.com/en/ai-comparison/gpt-5-codex/) · [All AI model comparisons](https://alhertech.com/en/ai-comparison/)