Andrew Sima

harvard ‘24

[Alex Sima @sima_alexx]

Claude Code and Codex wasted days of my time so I ragequit. built Bullet as a passion project, a really fast coding agent.

[Alex Sima @sima_alexx]

Taking the leap is hard, but there's joy in the unknown.

@AdiKulkarni6 and I spent senior year pivoting through 4 ideas (including an AI hedge fund). Now we're building @davidhfdata — synthetic market data for superhuman AI trading.

Excited to join @ycombinator S26!

[Alex Barashkov @alex_barashkov]

Introducing Aval - a new open source format for interactive video on the web. It has a built-in state machine, frame accurate transitions, and packed alpha transparency.

This is probably the craziest thing I’ve ever built with Codex.

I’d been dreaming about this technology for years. Before AI, building it would have taken months of work. I could never justify that investment for a noncommercial open source project. Then, a little over a year ago, Airbnb created Lava for almost exactly the same purpose. That gave me hope. But Lava was never released as open source.

So I decided to build my own, with AI.

Aval comes with a compiler and a web renderer. Together, they give you:
• a deterministic state graph - named states, authored triggers, and routing where the latest trigger wins.
• frame accurate routes with transitions that begin on authored content frames using portals, finishes, cuts, and reversals.
• small file size and low CPU overhead, perfect for small icons designed and animated in Blender.
• seekless loops so the decoder timeline keeps moving forward across loop seams instead of seeking.
• packed alpha transparency. transparent prerendered motion composited with WebGL2.
• a web native runtime: decoding with WebCodecs and rendering with WebGL2.
• progressive fallback: Host-owned fallback markup remains available for unsupported and reduced motion contexts.

Now it exists, it’s open source, and it’s available today as a technical preview.

I’ll be polishing it further over the next few days.

[eva @evayzh]

if you like watching videos on 2x speed you might like watching GPT-sol do things with CUA

here's GPT- Sol making a cannon in Blender (but this video is NOT sped up)

make CUA fast again

[Bill Chen @realchillben]

feel the agi

[ganii @gahhnie]

the chinese are puffing shit i couldnt even fathom

[Sam Altman @sama]

here is a little hint: 🎁

[Andrew Sima @a_sima_007]

the dlsys course from cmu is chef’s kiss 🤌 highly recommend. no wonder cmu kids so cracked

[OpenAI @OpenAI]

10am PT.

[OpenAI @OpenAI]

4o image generation has arrived.

It's beginning to roll out today in ChatGPT and Sora to all Plus, Pro, Team, and Free users.

[Andrew Sima @a_sima_007]

Anyone ever built a project using Shopify Polaris? Tried their design library and found it literally unusable

[Andrew Sima @a_sima_007]

@itsandrewgao deeper lore is the place next to it

[Andrew Sima @a_sima_007]

Anyone need better image segmentation? I built this prompt to image segmentation labelling tool, think it'd be useful for ML devs and researchers. Check it out at https://t.co/zCAu2P2hOB

[Andrew Sima @a_sima_007]

Just finished watching the JJK movie. Proud to say that Nanami is still a gigachad, thank god the animators always do my boy a solid

[Andrew Sima @a_sima_007]

Pretty cool that you can get terraform from GCP, probably a result of https://t.co/moMSWG6Isa. AWS needs to add a button that does this too