Discussion

• @mntruell Michael Truell on x

  We built a browser with GPT-5.2 in Cursor.  It ran uninterrupted for one week.  It's 3M+ lines of code across thousands of files.  The rendering engine is from-scratch in Rust with HTML parsing, CSS cascade, layout, text shaping, paint, and a custom JS VM.  It *kind of* works!  I…

• @patrickc Patrick Collison on x

  This work by @cursor_ai is, I think, the coolest AI breakthrough since GPT-4. (And there are plenty of candidates!) https://simonwillison.net/...

• @mntruell Michael Truell on x

  @patrickc @cursor_ai Lots more to figure out, but perhaps a glimpse at the not-too-distant future. One concrete data point: a critical, isolated component of an upcoming launch was fully written by one of these “agent grind” sessions. It finished overnight and would've taken roug…

• @ericzakariasson Eric Zakariasson on x

  this is the future of software creation btw

• @ai_for_success AshutoshShrivastava on x

  Claude Code and Opus were taking all the attention, so the Cursor team built a browser from scratch using GPT 5.2. 3M plus lines of code across thousands of files. Crazy.

• @kimmonismus @kimmonismus on x

  Holy S***: CEO of Cursor said they coordinated hundreds of GPT-5.2 agents to autonomously build a browser from scratch in 1 week “We built a browser with GPT-5.2 in Cursor. It ran uninterrupted for one week. It's 3M+ lines of code across thousands of files. The rendering engine […

• @burkov @burkov on x

  Cursor is becoming obsolete because Claude Code just does everything faster and better, so they are trying to hype “generative AI” when it's already looking lame. If you ask an agentic coding system with a runtime feedback loop to build an app whose meaning is clear, like “web

• @deryatr_ Derya Unutmaz on x

  This is unbelievable! GPT-5.2 built a browser with 3 million lines of code in one week. It's practically game over for software development, as these models will get exponentially better this year and beyond. Incredibly, first level AGI for coding was reached in 2025!

• @yuchenj_uw Yuchen Jin on x

  Many people think it was 1 agent writing 3M+ lines of code.  It's not.  It was hundreds of concurrent agents.  Key learnings from Cursor's blog: - Letting many agents self-coordinate as peers does not work - Clear roles work better: planners, workers, judges - GPT-5.2 performs be…

• @mntruell Michael Truell on x

  Watch Cursor build a 3M+ line browser in a week [video]

• @simonw Simon Willison on x

  In case anyone's interested, that vibe-coded(ish) web browser project that Cursor released the other day does actually compile now, they fixed it up and added instructions to the README. I built it on my Mac and took these screenshots: [image]

• @moskov.goodventures.org Dustin Moskovitz on bluesky

  Long predictions are falling faster all the time, but it's pretty notably that Simon only made this forecast on Jan 8, predicting something that might happen 3 years in the future.  [embedded post]

• @simonwillison.net Simon Willison on bluesky

  Having compiled and run the web browser that Cursor built in a couple of weeks using mostly a giant fleet of coding agents I'm actually very impressed by it - there are rendering glitches but the renders it produces are surprisingly usable for a few-week-old project simonwillison…