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OpenAI DevDay 2026 live blog Simon Willison’s Weblog Subscribe OpenAI DevDay 2026 live blog 29th September 2026 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. More recent articles 2026 in LLMs (so far) - 27th September 2026 Claude Opus 5.5, GPT-6 Sol, GPT-6 Luna, and a new price war - 22nd September 2026 This is OpenAI DevDay 2026 live blog by Simon Willison, posted on 29th September 2026. ai 2,255 openai 468 generative-ai 1,999 llms 1,966 coding-agents 253 live-blog 6 Previous: 2026 in LLMs (so far) Monthly briefing Sponsor me for $10/month and get a curated email digest of the month's most important LLM developments. Pay me to send you less! Sponsor & subscribe Disclosures Colophon © 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026