Excited to be back at #CascadiaJS 🙌

🎁 GPT-5 is 50% off on OpenRouter - for a week - No opt-in needed 🚀 - Discount limits to 20 RPM, standard price after that - From Sept 17th, 10 AM PST to September 24th, 10 AM PST Give OpenAI GPT-5 a try openrouter.ai/openai/gpt-5

Today we’re releasing research with Apollo Research. In controlled tests, we found behaviors consistent with scheming in frontier models—and tested a way to reduce it. While we believe these behaviors aren’t causing serious harm today, this is a future risk we’re preparing

12/12 problems solved, which would be equivalent to a 1st place performance. GPT-5's solutions were responsible for solving 11/12 of them.

I've seen lots of poor takes on here but pizza in the bay all being trash??

Seattle AI hackathon this weekend! Over $1000 in prizes and free credits from OpenAI, Thinkspace, and Neon. luma.com/yu2ccnvr

Sharing OpenAI's submissions that solved 12 out of 12 problems from the ICPC World Finals, under the same 5-hour constraint and judged concurrently and identically to championship submissions. github.com/openai/openai-…

Only ⁦Kevin Whinnery⁩ can combine practical OpenAI Developers GPT-5 tips with K-pop song recommendations at ⁦CascadiaJS 🇺🇸 🇨🇦⁩

So great to see so many (ex-)Twilio DevNet folks together at CascadiaJS 🇺🇸 🇨🇦 💖

Lovely words by Carter Rabasa about how great of a person Mikael Rogers was and the impact he had on the JavaScript we all write today ❤️

You can now get code review in the Codex CLI additionally to the @.codex code review on GitHub

It's Craig Dennis and Yorick the talking hand from AI Avenue opening CascadiaJS 🇺🇸 🇨🇦 talking about AIdentity Crisis and the feelings side around using AI and creating with AI

Pro tip: for long multi-hour tasks, many of us at OpenAI start by asking codex to write a markdown file with a plan and todos. Iterate on the plan then go!

What a start to day two of CascadiaJS 🇺🇸 🇨🇦 with Phil Nash @ #CascadiaJS talking about the experimental AI APIs in Chrome that web developers can use for browser-local AI use cases

Every time I see Adam Argyle I feel like I missed a decade of CSS innovation 25 CSS features in 25 minutes 😱 #CascadiaJS

Great write up about why we built the Responses API and what makes it different to Chat Completions

We heard you love GPT-5-Codex so now it's available in the API 🎉

OpenAI DevDay is in two weeks, then we hit the road. DevDay [Exchange] connects local developers in: São Paulo • Oct 16 London • Oct 21 Bengaluru • Nov 4 Tokyo • Nov 11 Seoul • Nov 13 Spots are limited for these intimate gatherings. Apply: events.openai.com/devdayexchange

Codex CLI v0.41 now shows usage limits and reset times ⏱️ Run /status to check. Keep the feedback feedback coming—we're still early in figuring out the best way to share compute.

Today we’re introducing GDPval, a new evaluation that measures AI on real-world, economically valuable tasks. Evals ground progress in evidence instead of speculation and help track how AI improves at the kind of work that matters most. openai.com/index/gdpval-v0