Cursor: Claude Fable 5.2 Tops CursorBench at 60% on Max Effort
Claude Fable 5.2 is now available in Cursor! At max effort, it's the top model on CursorBench at 60%. Fable 5.2 scores 56.9% on CursorBench at default effort, up from 49.2% for Fable 5.1.
Context
An independent coding tool maker reports the new Anthropic model as its best scoring model, a strong early signal for developers choosing a default.
Anthropic launched Claude Fable 5.2 and Claude Mythos 5.2 on Nov 9. Cursor, the AI code editor, added Fable 5.2 the same day and published results from CursorBench, its internal benchmark for coding tasks inside the editor.
Deep dive
Cursor said Claude Fable 5.2 is now available in its editor and that, at max effort, it is the top model on CursorBench with a score of 60%. At default effort, Cursor reported a score of 56.9%, up from 49.2% for Fable 5.1, a gain of 7.7 points between versions.
The chart in Cursor's post plots CursorBench 4.0 score against average cost per task. It marks Fable 5.2 at high effort, the default, at 56.9% and about $9.70 per task, and also labels other models including Gemini 4 Argon, Opus 5.5, Sonnet 5.5, Haiku 5.5, Muse Wonder, Grok 4.7 and GPT 5.6 Sol at lower scores and lower costs.
CursorBench is Cursor's own evaluation, so the numbers come from Cursor and have not been reproduced by an outside group. The result is one of the first partner evaluations published after Anthropic's Nov 9 launch, and Cursor's post drew over 100,000 views within hours of release.
What to expect next
Expect other coding tools and public leaderboards to publish their own results for Fable 5.2 and Mythos 5.2 in the coming days. The cost axis in Cursor's chart suggests price per task will shape whether teams make Fable 5.2 a default or keep it for hard problems, so watch for pricing and effort level guidance from Anthropic and Cursor, and for any update to CursorBench itself.