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Monday, October 12, 2026Sources checked

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API & Codex

OpenAI DevDay 2026 live blog

Simon Willison

OpenAI DevDay 2026 live blog

Picture: Simon Willison

I’m at OpenAI DevDay today, in Fort Mason, San Francisco. Same as last year I’ll be live blogging the keynote and some other notes during the day. OpenAI gave me a free ticket and a seat in the “creator” area for the keynote. 09:27 I'm in the room for the keynote, which starts in half an hour. This year I vibe-coded a system for more easily adding photos to my live blog. I intended to do that using Codex Cloud (I built it on my phone on the way to the venue) but ran into problems with that and switched to Claude Code for web instead. 10:01 Sam Altman is on stage, welcoming us to DevDay. He promises "our best DevDay yet".

This report was first published by Simon Willison. What you see here is a brief excerpt. The full text is theirs.

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