Claude Fable 5.1 is now available in Cursor!
It's the most capable model we’ve run on CursorBench 3.2, scoring 73.4% at max effort.
We found it especially skilled at verifying its own work, allowing it to take on difficult coding tasks from start to finish.
agent harness — The scaffolding around a model that turns it into a working agent — the loop, the tools it can call, and the rules for when to stop.
Why it matters
A second agent harnessThe scaffolding around a model that turns it into a working agent — the loop, the tools it can call, and the rules for when to stop.Full definition → confirms the coding gain with its own measurement, and the model is selectable in Cursor now, so you can test the claim against your own repository.
