Notes on Cursor 2.0 and a pelican drawn by their brand new Composer-1 coding model, which they describe as "4x faster than similarly intelligent models" https://simonwillison.net/2025/Oct/29/cursor-composer/
And it's not just Cursor... rival agentic coding IDE Windsurf announced their own custom RL-trained fast coding model today as well!
Here are notes and a pelican on Windsurf's new SWE-1.5 model https://simonwillison.net/2025/Oct/29/swe-15/
