Simon Willison 4/23/2026

A pelican for GPT-5.5 via the semi-official Codex backdoor API

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This article covers the release of GPT-5.5, available in OpenAI Codex and rolling out to paid ChatGPT subscribers. It discusses the ongoing tension between AI agent harnesses like OpenClaw and API providers, highlighting OpenAI's support for integrating Codex with subscriptions. The author reverse-engineered the Codex repo to create 'llm-openai-via-codex', a plugin for LLM that uses existing Codex subscriptions to run prompts. The article includes technical details on installation and usage, focusing on AI model access, API workarounds, and open-source tooling in the AI/tech space.

A pelican for GPT-5.5 via the semi-official Codex backdoor API

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