Simon Willison 12/13/2025

OpenAI are quietly adopting skills, now available in ChatGPT and Codex CLI

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The article reveals OpenAI's adoption of 'skills'—a mechanism pioneered by Anthropic—in ChatGPT and the Codex CLI. Skills are folders containing Markdown files and optional scripts that extend AI capabilities. The author details discovering a /home/oai/skills folder in ChatGPT's Code Interpreter and explores skills for handling spreadsheets, PDFs, and documents. It also covers experimental skills support in the open-source Codex CLI tool, including a practical example of creating a Datasette plugin skill.

OpenAI are quietly adopting skills, now available in ChatGPT and Codex CLI

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