---
title: "Discussion on \"GPT-5.5-Codex vs 5.3: A 200-Task Bench Result\" | Hashnode"
description: "Discussion on \"GPT-5.5-Codex vs 5.3: A 200-Task Bench Result\". On a 200-task bench split across a TypeScript SaaS and a Python ML pipeline, GPT-5.5-Codex closed 81% of tasks unattended versus 67% for GPT-5.3-Codex, and burned 38% fewer reasoning tokens on the multi-step ones. But on trivial single-file edits it ..."
url: "https://hashnode.com/posts/2026-04-30-gpt-5-5-codex-vs-5-3-comparison/69f36e0f2df0f62fae23c7b1"
---

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# [GPT-5.5-Codex vs 5.3: A 200-Task Bench Result](https://plzai.hashnode.dev/2026-04-30-gpt-5-5-codex-vs-5-3-comparison?utm_source=hashnode&utm_medium=feed)

On a 200-task bench split across a TypeScript SaaS and a Python ML pipeline, GPT-5.5-Codex closed 81% of tasks unattended versus 67% for GPT-5.3-Codex, and burned 38% fewer reasoning tokens on the multi-step ones. But on trivial single-file edits it ...

Apr 30 · 7 min read · plzai.hashnode.dev  
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