Simon Willison 4/23/2026

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

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This article discusses the release of GPT-5.5, available in OpenAI Codex and rolling out to ChatGPT subscribers. It covers the omission of the API release due to safety requirements, the controversy around agent harnesses like OpenClaw integrating with subscription APIs, and OpenAI's support for such integrations. The author details creating an LLM plugin called 'llm-openai-via-codex' that leverages the Codex subscription to run prompts, reverse-engineering authentication from the openai/codex repo. The article is tech-focused, covering AI models, APIs, and software development.

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

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