Cesar Fernandez

@noahzweben “a few days ago” 🔥

And a massive kudos to kenneth who built the dang thing!

This data is absolutely phenomenal - the rigor behind the questions and clear presentation of results is unmatched, illuminating issues we kind of felt but couldn't concretely pin down

Really insightful look into how @claudeai use AI. Worth a read 👇

🙏🏼

Huge. This team is on fire! @claudeai

Noooooo

@minchoi This is amazing

Holy smokes... Google Maps now has AI and 3D immersive navigation🤯

Welcome to the Dolphins, Malik Willis!

New favorite use of @claudeai: nerdy coffee consultations

That’s 11 in a row to finish the regular season 🐊 Gators finish the regular season a CRISP 25-6 (16-2 SEC) Time to finish the mission 😈

Another one

The team stays shipping

A statement from Anthropic CEO Dario Amodei: anthropic.com/news/where-sta…

More than a million people are now signing up for Claude every day. To everyone choosing to make @claudeai part of how they work and think: welcome.

@mmurph 🇺🇸

the performance is exceptional, the acceleration at this scale, beyond words!

Thanks to all of our customers who find @claudeai useful. Onward.

Now is a good time to say I'm hiring @anthropicai for the Frontier Red Team. We need Research Scientists on the biggest issues in model safety, like cyber, autonomy, and agent risks. 2026 is the year. I can promise you your life's work and the most meaningful mission.

@max_a_schwarzer @MillionInt @polynoamial Welcome to Anthropic, Max!

I've decided to leave OpenAI. I'm incredibly proud of all the work I've been part of here, from helping create the reasoning paradigm with @MillionInt, scaling up test-time compute with @polynoamial, working on RL algorithms with my fellow strawberries, shipping o1-preview (which started life as of one of my derisking runs), to post-training o1 and o3 with @ericmitchellai, @yanndubs and many others. I'm most proud of having led the post-training team here for the last year -- the team has done incredible work and shipped some really smart models, including GPT-5, 5.1, 5.2, and 5.3-Codex. OpenAI has genuinely some of the most talented researchers I have ever met, and I have learned more than I could have imagined knowing since I joined as a new grad. I want to thank @markchen90 @FidjiSimo @sama @merettm for all their support over my time here, and too many collaborators to name for the insights, ideas, and just plain fun we have had working together. After leading post-training for a year, though, I'm longing to start fresh and return to IC research work. I've been thinking about going back to technical research for quite some time, and I genuinely believe my colleagues and team here are set up to succeed going forward without me. I'm personally very excited for my next chapter -- I'm proud to be joining @AnthropicAI to get back into the weeds in RL research, and I'm looking forward supporting my friends there at this important time. Many of people I most trust and respect have joined Anthropic over the last couple of years, and I'm excited to work with them again. I have also been very impressed with Anthropic's talent, research taste and values, and I'm excited to be part of what the company does next!

i think we’re going to run it back

@hpierrejacques 🙏🏼

Well that was faster than I expected…