James Xu

mlsys @xAI

[James Xu @jamesxu]

@veggie_eric eric it was a good effort 👍

[James Xu @jamesxu]

@yanlin_duan 🐘

[James Xu @jamesxu]

@fluorane deepseek v5

[James Xu @jamesxu]

@evanzwangg rocket bro 🚀

[James Xu @jamesxu]

@daniel_c0deb0t 👨‍🍳

[James Xu @jamesxu]

@gen_intuition this is insane 🚀 super cool work

[Elon Musk @elonmusk]

Grok 4.5, based on our 1.5T V9 foundation model, with Cursor data added in supplemental training, is now in private beta at SpaceX & Tesla. Early evals show performance close to, perhaps exceeding Opus.

RL is continuing to significantly improve the model, and the Grok Build harness gets better every day.

Nice work by all those involved!

Completely trained from scratch new models will be released by @SpaceX every month this year.

[James Xu @jamesxu]

@leonbi100 🚀

[James Xu @jamesxu]

@murage_kibicho is dosovitskiy nominative determinism 🤔

[James Xu @jamesxu]

@maxwell54650346 🚀

[James Xu @jamesxu]

@lmsysorg @modal brrrrr

[James Xu @jamesxu]

@animeshbohara 🐐

[James Xu @jamesxu]

@msarthak29 @njkumarr

[James Xu @jamesxu]

@fluorane 🤔 1⃣🍲

[James Xu @jamesxu]

@Randxie29 goat

[James Xu @jamesxu]

@devindkim 🐐🧠

[James Xu @jamesxu]

@finn_hulse hello

[James Xu @jamesxu]

@EthanHe_42 pleasure working with you and best of luck with whatever is next!

[Andrej Karpathy @karpathy]

Personal update: I've joined Anthropic. I think the next few years at the frontier of LLMs will be especially formative. I am very excited to join the team here and get back to R&D. I remain deeply passionate about education and plan to resume my work on it in time.

[James Xu @jamesxu]

@hsu_byron @ChengWan17 inference 🐐🐐