Lukas Biewald

When I was just starting my first company and didn’t know anyone in tech, Om helped me out and asked for nothing in return. He was relentlessly positive and supportive of everything I worked on. Seeing my twitter feed, it’s incredible how many people he touched in the same way. What a great human. om.co/2026/06/24/196…

Introducing Exa Connect: connecting agents to data beyond the public web. Available today with ZoomInfo, Crunchbase, Similarweb, and many other leading data providers. exa.ai/connect

I went back and reinforced the broken parts and it’s really starting to work!

I vibe-CADed a hexapod walker entirely with claude/codex, learned the walking gait entirely in the 3d simulator, 3d printed the generated files, ordered the full BOM from amazon, assembled the thing. The fact that this is possible is amazing, but there's still some clear differences between the simulated world and reality 😀.

Introducing “Comeback City: A Love Letter to San Francisco.” Proud to call this place home.

@SFBART my two year old son is obsessed with BART and desperately wants a BART map tshirt in his size - he talks about it every night - would you ever make this?

.@SGRodriques left physics because "there were no unsolved problems left." So he built an AI scientist to cure every disease, solve aging, & map the human brain. New Gradient Dissent episode out now. @l2k

Lukas Biewald (@l2k) built Weights & Biases into the system of record for AI model training at OpenAI, Meta, NVIDIA, and 30+ other foundation model builders. He also built it on ClickHouse. Now SVP of AI at CoreWeave, Lukas is joining us at Open House for a conversation on ecosystem and technology trends. Register free: clickhouse.com/openhouse/san-…

when I find myself training models... @wandb

@BEBischof Thanks Bryan, I’m retrospect I should just call you for questions like these instead of posting on X for only you to see it 😊

@l2k Another thread here: x.com/rnaferreira/st…

OpenAI proves a surprising result on an easy to understand problem with a constructive proof involving points on a 2d plane. I feel like there should be an awesome visualization of these points but I can’t find one - has anyone made one yet?

@BEBischof Thanks!

@l2k Some discussion and an attempt here: x.com/mathandcobb/st…

@bernhardsson @generalcatalyst @Redpoint Congrats on building a fantastic product!

Today we're announcing our Series C funding: $355M at a $4.65B valuation, led by some great investors @generalcatalyst and @Redpoint. We've had insane growth in the last year, but we're still very early. So proud of the team and what we have built so far!

We raised $250M in Series C funding at a $2.2B valuation, led by a16z. Exa is a search lab organizing the web's data for agents.

vibe-cadding is simultaneously so amazing and so frustrating

I love letting my six year old daughter create crazy cursor prompts and seeing what it spits out. If you find this summary intriguing, you can try the game at otto-game-browser.netlify.app - it did an impressive job with a tough spec

What happens when you post a real Monet and say it’s AI? The coolest art social experiment I’ve seen in a while. Thank you @SHL0MS

@yanabana This is really cool! I’ve been doing a lot of CAD experiments in other domains. My experience sounds similar that the LLMs are terrible at generating it directly but can generate python code to generate good CAD files

I’ve been experimenting with having Codex generate dress patterns in CLO (fashion software) and render them on a 3D model. It found a Python API… and just skipped the UI entirely. Here’s the result after 10 hours of fully autonomous work: Still early, but kind of wild.

@ClementDelangue Always the best advice 😀

@l2k Try it!

The new Claude and OpenAI models are vastly better at physical reasoning and generating CAD files. I had them design me a mathematical chandelier and a life size hexapod walker. The assembly instructions, seem plausible, I wonder if it will work.