OpenAI quietly adopted Anthropic's "skills" mechanism in ChatGPT and Codex; ChatGPT's skills include creating and modifying spreadsheets, docx files, and PDFs (Simon Willison/Simon Willison's Weblog)

Simon Willison / Simon Willison's Weblog: OpenAI quietly adopted Anthropic's “skills” mechanism in ChatGPT and Codex; ChatGPT's skills include creating and modifying spreadsheets, docx files, and PDFs  —  One of the things that most excited me about Anthropic's new Skills mechanism back in October is how easy it looked for other platforms to implement.

Dec 12, 2025 - 22:00
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OpenAI quietly adopted Anthropic's "skills" mechanism in ChatGPT and Codex; ChatGPT's skills include creating and modifying spreadsheets, docx files, and PDFs (Simon Willison/Simon Willison's Weblog)

Simon Willison / Simon Willison's Weblog:
OpenAI quietly adopted Anthropic's “skills” mechanism in ChatGPT and Codex; ChatGPT's skills include creating and modifying spreadsheets, docx files, and PDFs  —  One of the things that most excited me about Anthropic's new Skills mechanism back in October is how easy it looked for other platforms to implement.

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