Claude Fable 5.1 Tops Senior SWE-Bench Leaderboard

Alex Ratner, co-founder and CEO of Snorkel AI and affiliate assistant professor at UW who originated the Snorkel project at Stanford, retweeted a post by @henryehrenberg. The post states that Claude Fable 5.1 now tops the Senior SWE-Bench leaderboard, edging out Fable 5 on the pass^3 tie-breaker for more consistency. The packet contains no independent sources or first-party announcements confirming the leaderboard result.