Kefan Yang

Vision. Courage. Patience.
Building the agentic video editor.
Prev @Google

[Kefan Yang @YangKefan]

I use Zoea Agent to create this video.

It helps me:

- Manage character references
- Generate video prompts
- Build chat bubbles + outro animation

I still manually tweak some timelines. (You can see my agent chat history at the end)

[Kefan Yang @YangKefan]

@JinjingLiang Thanks Jinjing! Just visit https://t.co/Siy0wGnhPr!

[Kefan Yang @YangKefan]

Introducing Zoea, the AI video editor.

We can now better support talking-head videos like this.

Use /remove-filler-words to make your speech clean.

Add color filters.

Add captions.

Add background music.

ALL IN ONE PLACE. No more jumping between tools.

[Andy Hall @ahall_research]

When we built @karpathy's LLM council in class last quarter, we noticed that Claude Code always made Claude the chairman of the council. Coincidence, or self preference?

@JessicaPersano and I decided to run a set of experiments to find out. Main findings:

(1) When given the free choice, Claude Code and Codex massively favor their own company's models, both in terms of appointing judges for evaluation tasks, and in terms of SDKs.

(2) When told using a different company's model would be better, Codex demonstrates admirable flexibility; Claude Code stubbornly sticks to Claude models.

(3) Claude's stubbornness comes from the CLI wrapper, which contains specific instructions for Claude Code to favor the Anthropic SDK. When we replicate the experiments using Claude through the API, it is similarly flexible to Codex.

We're not sure yet what to make of all this. On the one hand, it's totally understandable for a company's coding agent to prefer its parent company's tooling.

On the other, if the economy is soon to be run by millions of these coding agents, then this kind of "bundling" is likely to get very contested.

For political superintelligence, we'll need to truly own our agents. They'll need to answer to us, not the model companies. Agents given instructions to prioritize their own company's tooling may not be consistent with this kind of strong ownership down the line.

As you can tell this is early stage work and our thinking hasn't yet congealed---would very much appreciate people's thoughts. When should coding agents prioritize their own company's AI tools? When is it a genuine problem?

Excited to keep working on this! A link to the full post is below.

[Kefan Yang @YangKefan]

@johnbiggs sure thing. please DM

[Kefan Yang @YangKefan]

@NUMBER1MIITUBER Ram is expensive because demand > supply

[Kefan Yang @YangKefan]

@devaslanca Thank you!😃

[Kefan Yang @YangKefan]

Introducing Zoea, the AI video editor.

We can now better support talking-head videos like this in our desktop app.

Use /remove-filler-words to make your speech clean.

Add color filters.

Add captions.

Add background music.

ALL IN ONE PLACE. No more jumping between tools.

[Paul Graham @paulg]

It could actually be a significant problem that Europe doesn't have enough garages. This sounds like a joke, but I'm serious. Garages let you work on stuff that doesn't matter yet, which is how big things often start. The outliers of ideas need the outliers of space.

[Kefan Yang @YangKefan]

Cursor > Claude Code

Cursor is much better at building context for your project.

[Andrej Karpathy @karpathy]

@VBarsoum Haha yeah I call it cozy coding :)
Usage: “This valentines, cozy code with someone you love”

[Kefan Yang @YangKefan]

If you're serious about building agents right now, build them as local apps.

[Kefan Yang @YangKefan]

Hi, here's my 60s elevator pitch for Zoea at Web Summit Vancouver 2026.

Any suggestions? 😃

[Kefan Yang @YangKefan]

health is big but sometimes i feel openai should be more focused :(

[Karan Singhal @thekaransinghal]

Today we’re introducing two big steps for health at OpenAI:

- ChatGPT for Clinicians, a free version of ChatGPT designed for clinical work
- HealthBench Professional, a new benchmark to evaluate real clinician chat tasks

We’re excited about what this can unlock for care. ❤️

[Kefan Yang @YangKefan]

@Armen_Yegoryan @threejs followed. very interested in your work

[Kefan Yang @YangKefan]

Hi, here's my 60s elevator pitch for Zoea at Web Summit Vancouver 2026.

Any suggestions? 😃

[Kefan Yang @YangKefan]

Morning, builders.

[Kefan Yang @YangKefan]

Apparently you have more/better future if you were Elon I guess

[Elon Musk @elonmusk]

Children are the future

[Kefan Yang @YangKefan]

i like VPL i use it as workspace for our startup

[Kareem Allam @kareemformayor]

Great to be at the Vancouver Public Library with the team.

Libraries are essential spaces for learning and community, and they deserve our support.

[Kefan Yang @YangKefan]

@Glitchymagic Press UNDO button

[Kefan Yang @YangKefan]

I really hope humans can survive this AI boom.

Good night, everyone.

[Kefan Yang @YangKefan]

Try for yourself https://t.co/Siy0wGnhPr

[Kefan Yang @YangKefan]

If you want to do Motion and Video Generation in one place, you should use Zoea.

I made this video without leaving the app (music is epic):