Passing tests is not enough: structural scoring picks 1,024 agent trajectories and lifts SWE-Bench Verified pass@1 to 27.6%
Supervised fine-tuning of coding agents no longer has to select only on whether the final patch passes the test suite: ranking trajectories by structure and keeping the top 1,024 raised pass@1 on SWE-Bench Verified from 24.8% for a random subset to 27.6%.