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Claude Fable 5 results are in! It's the new Senior SWE-bench leader at 27.9%, 3 pts above Opus 4.8 (the previous #1).
Fable 5 excels at open-ended feature tasks, improving 35% over Opus 4.8. It's also more expensive: 8x more output tokens than GPT-5.5 on avg. And we observed
