We achieved gold medal level performance on this year's IMO! Our model thinks and writes proofs in clear, plain‑English - no formal code required. Unlike the narrower systems used in past competitions, our model is built to reason broadly, far beyond contest problems.

We're launching a new way to use ChatGPT to promote learning through more engaging step-by-step responses. Excited for people to try Study Mode!

Our open models are here. Both of them. openai.com/open-models

Open AI, courtesy of OpenAI.

Our open-weight reasoning models are out, and they're great! Run them on your desktop and try them in the Codex CLI: `codex --oss`

Just the small things: The Retry button just got smarter in ChatGPT. Request some common edits, or make any change without cluttering the conversation.

GPT-5 is here. Rolling out to everyone starting today. openai.com/gpt-5/

"there will no longer be an excuse for ugly internal applications"

yep. recommend using the default options which work better: - `codex` - or `codex -s workspace-write -a on-request`

📣 We shipped major improvements to the Codex CLI today GPT-5, with usage included in your ChatGPT Plan (no API key needed) Upgraded prompt, harness, approvals & sandboxing logic... you name it Get the latest: 1. `npm install -g @openai/codex` -> v0.16+ 2. `codex login`

gippity 5 has entered the chat

was fun playing a small part in improving gpt 5’s design and front end chops!

Codex CLI + GPT-5:

Lots of excitement about GPT-5 in Codex CLI via your ChatGPT plan. Some details: 1. Yes, if you sign in with ChatGPT, usage is included via your paid plan! 2. Still determining exact rate limits, but the goal is to be generous: -- Pro users should basically not hit limits

working with reah miyara has been a highlight at OpenAI - super high impact role in the model behavior team!

GPT-5 is astonishingly good at frontend development. Here’s a gallery of dozens of beautiful demo applications, each generated entirely in a single GPT-5 prompt, without writing any code by hand! ✨

Codex CLI now works with your ChatGPT login, with generous GPT-5 use included in the plus and pro plans. $ brew install codex $ codex It's that simple.

The AGENTS.md microsite is live! Think of it as a README for agents: a simple, open format for guiding coding agents. It’s been awesome to work alongside peers from Amp — Research Preview, Cursor, Jules, Factory, and Roo Code to bring this to life!

So fun working on this with Romain Huet and the OpenAI team! We launched AGENTS.md support in Jules back in June, and have gotten great feedback about it. Nice to see that the URL now maps to something useful. :P

.Romain Huet and team cooked on this one!