# Codex CLI vs GPT-5.5 (2026): Benchmarks, Price & Verdict | Alher Tech

> Codex CLI vs GPT-5.5: 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/codex-cli-vs-gpt-5-5/
- Site: Alher Tech (custom software, AI agents and SEO engineering, https://alhertech.com/)
- Contact: https://alhertech.com/en/contact/

---

|  | Codex CLI | GPT-5.5 |
| --- | --- | --- |
| arenaElo | 1408 | 1432 |
| humanEval | 95.5 | 94.2 |
| sweBench | 70 | 66 |
| mmlu | 88.6 | 93 |
| gpqa | 60.8 | 68.7 |
| aime | 86 | 92 |
| Price in/out ($/M) | $9 / $36 | $12 / $48 |

## Our verdict

Use Codex CLI to write the SaaS (backend, billing, auth, tests). Use GPT-5.5 inside the SaaS to power voice, vision and tool-calling features your B2B clients actually charge for. Most Alher Tech enterprise deliveries run this exact split.

[Codex CLI](https://alhertech.com/en/ai-comparison/codex-cli/) · [GPT-5.5](https://alhertech.com/en/ai-comparison/gpt-5-5/) · [All AI model comparisons](https://alhertech.com/en/ai-comparison/)