Henry Kiss Ehrenberg @henryehrenberg · 01 Sep 2026
Claude Fable 5.1 now tops the Senior SWE-Bench leaderboard, edging out Fable 5 on the pass^3 tie-breaker (more consistently shipping quality code). Interestingly, its best effort tier is Medium. Combined with cheaper cache reads, it matches Fable 5's perf at ~50% of the cost. https://t.co/8hq0g80bEh
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