Byron Hsu
@hsu_byron
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ML system @xAI | @lmsysorg @liger_kernel @flyteorg @theASF
Joined November 2017
We are using SGLang at really large scale RL, and it’s been working great :)
xAI may be one of the single biggest contributors to open-source inference just by serving everything with SGLang
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xAI may be one of the single biggest contributors to open-source inference just by serving everything with SGLang
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Grok-code-fast-1 is now out and available for everyone to use 🚀🏎️💨 When I joined the coding team, the team was just 3 people and we very quickly built a model which was SOTA on SWEBench. But as things go, in the real world benchmarks matter less. Over the last few months we
Introducing Grok Code Fast 1, a speedy and economical reasoning model that excels at agentic coding. Now available for free on GitHub Copilot, Cursor, Cline, Kilo Code, Roo Code, opencode, and Windsurf. https://t.co/3tMbmLbxOP
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Only at xAI
Kudos to our crew 👏 "we've got a truly marvelous group of people, which this margin is too narrow to tag them all" fun side note: happy to witness two launches in a week😆 photoed in @SpaceX launch site, Starbase.
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We are hiring brilliant engineers to work on pretraining! Join us to tackle pretraining data, design cutting-edge data recipes, and build next-gen data infra. If you’re driven to accelerate human discovery and ready to change the world, apply now to join our galactic mission!
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Hardcore engineers 🏋️♂️
If you know kube, Linux, file systems, process scheduling, tcp/ip, ibverbs - reach out. we might have just the place for you dms open
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Sounds like there's a lot of alpha in just hiring the best. I wonder if anyone knows a place that does that?
The guy in need of the job was telling me he made it to final interview rounds with multiple Fortune 500 tech companies and in each one, the final interviewer was not the would be manager, CEO, or people he’d work with, but a white HR lady in California.
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At xAI, we are managing traffic at an unprecedented scale. Our team is small, dedicated, and highly skilled. In this role, you will own a critical part of our production serving infrastructure, collaborating closely with the research inference team to ensure it is elastic,
hi, @xai is hiring for k8s/traffic people on our supercomputing team -- you get to work with a lean and fast-moving team while shipping massive impact to many users worldwide. this is the most fun i've had at any company! please apply/DM and share. https://t.co/Mk4DvAzXrt
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Many people wonder what is the benefit of training video gen models. Video gen by itself doesn’t necessarily seem to provide as much raw intelligence to users as modern LLMs. However, in the long term, video gen models will be used as neural simulations of the universe within
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We are actively hiring for multimodal understanding and generation. Join us to build the future AI interfaces! https://t.co/qzULWOZQEq
https://t.co/DKdeK9LEAt
https://t.co/z0j11Q98FA
job-boards.greenhouse.io
San Francisco & Palo Alto, CA
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We are hiring on pretraining as well. If you are passionate about improving training efficiency, pretraining data quality and training infra. Please apply here: https://t.co/fKK8lGPd2P
https://t.co/3xVTBc5uOg
https://t.co/yJS5rmdQX6
job-boards.greenhouse.io
San Francisco & Palo Alto, CA
We are actively hiring for multimodal understanding and generation. Join us to build the future AI interfaces! https://t.co/qzULWOZQEq
https://t.co/DKdeK9LEAt
https://t.co/z0j11Q98FA
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Scaling CLIP on English-only data is outdated now… 🌍We built CLIP data curation pipeline for 300+ languages 🇬🇧We train MetaCLIP 2 without compromising English-task performance (it actually improves! 🥳It’s time to drop the language filter! 📝 https://t.co/pQuwzH053M [1/5] 🧵
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🎉 Thrilled to share that our paper “Verbalized Representation Learning for Interpretable Few‑Shot Generalization” has been accepted to #ICCV2025! 🚀 Check out the details:
📣 New Paper: Verbalized Representation Learning (VRL) VRL bridges prompt engineering and representation learning to enable automatic interpretable feature extraction — all without gradient descent! 🔥 +29% over SOTA 📊 95% less data https://t.co/3LtGnWCxSk
@uclanlp (1/n)
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3 countries where Grok iOS App is now #1 Hong Kong 🇭🇰, Japan 🇯🇵, Taiwan 🇹🇼 Thank You Asia!
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🧠🧠🧠
The Grok 4 livestream will begin soon. Stay tuned.
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xAI partners with @Polymarket to blend market predictions with X data and Grok’s analysis. Hardcore truth engine - see what shapes the world. This is just the start of our partnership with @Polymarket. More to come. 🚀
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We are incredibly grateful to @nvidia @NVIDIAAIDev for the generous donation of a DGX B200 to SGLang, in addition to a previous donation of DGX H100! SGLang cannot move such fast without NVIDIA’s support.❤️ We also thank our data center partner InnoMatrix for hosting the
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