Today, we're releasing OpenAI o3/o4-mini. The eval numbers are SOTA (2700 Elo is among the top 200 competition coders) But what I'm most excited about is the stuff we can't benchmark. I expect o3/o4-mini will aid scientists in their research and I'm excited to see what they do!

Meet Codex CLI—an open-source local coding agent that turns natural language into working code. Tell Codex CLI what to build, fix, or explain, then watch it bring your ideas to life.

We launched o3 and o4-mini today! Reasoning models are so much more powerful once they learn how to use tools end-to-end. Some of the biggest lifts are coming in multimodal domains like visual perception (see how it solves a maze in our blogpost: openai.com/index/thinking… 🤯)

today we are introducing codex. it is a software engineering agent that runs in the cloud and does tasks for you, like writing a new feature of fixing a bug. you can run many tasks in parallel.

livestream tomorrow at 10a PT!

ChatGPT 🤝 Deep research 🤝 Operator Livestream in 3 hours.

1/N I’m excited to share that our latest OpenAI experimental reasoning LLM has achieved a longstanding grand challenge in AI: gold medal-level performance on the world’s most prestigious math competition—the International Math Olympiad (IMO).

we achieved gold medal level performance on the 2025 IMO competition with a general-purpose reasoning system! to emphasize, this is an LLM doing math and not a specific formal math system; it is part of our main push towards general intelligence. when we first started openai,

Today is an episode I wanted to do for a while—a chat with the OpenAI’s power duo: its Chief Scientist Jakub Pachocki and Technical Fellow Szymon Sidor (and also my friends!).

we have a lot of new stuff for you over the next few days! something big-but-small today. and then a big upgrade later this week.

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

LIVE5TREAM THURSDAY 10AM PT

our livestream tomorrow at 10 am PDT will be longer than usual, around an hour. we have a lot to show and hope you can find the the time to watch!

Here at OpenAI we've cracked pretraining, then reasoning, and now we're experimenting with a new set of techniques that maximally leverage their interaction. GPT-5 is just the first step in this direction, and we're incredibly excited to see where scaling this up will lead us!

Claim: gpt-5-pro can prove new interesting mathematics. Proof: I took a convex optimization paper with a clean open problem in it and asked gpt-5-pro to work on it. It proved a better bound than what is in the paper, and I checked the proof it's correct. Details below.

💥 I’m starting something new inside OpenAI! It’s called OpenAI for Science, and the goal is to build the next great scientific instrument: an AI-powered platform that accelerates scientific discovery.

Now in preview: ChatGPT Pulse This is a new experience where ChatGPT can proactively deliver personalized daily updates from your chats, feedback, and connected apps like your calendar. Rolling out to Pro users on mobile today.

💥 We're hiring our first research scientists for OpenAI for Science! As a reminder, our goal is to build the next great scientific instrument: an AI-powered platform that accelerates scientific discovery.

Excited to release new repo: nanochat! (it's among the most unhinged I've written). Unlike my earlier similar repo nanoGPT which only covered pretraining, nanochat is a minimal, from scratch, full-stack training/inference pipeline of a simple ChatGPT clone in a single,

GPT-5.1 is out! It's a nice upgrade. I particularly like the improvements in instruction following, and the adaptive thinking. The intelligence and style improvements are good too.