SWE-rebench's decontaminated leaderboard has a 2.2-point spread across five frontier models.

On the May 15 – July 1 window (111 problems from 65 repositories, all post-dating training cutoffs), per the announcement thread and the leaderboard itself: Fable 5 at 64.5%, Grok 4.5 at 63.8%, Opus 5 at 63.4%, GLM-5.2 at 62.9%, GPT-5.6 Sol at 62.3%. Compare that to the 95.0 Fable 5 posts on SWE-bench Verified. On genuinely unseen repos the frontier is basically a coin flip, so route on cost and latency instead of leaderboard rank. A multilingual slice covering Go, Java, Rust, and TypeScript is new but single-sourced to the announcement.