Benchmark Almanac

SWE-bench Verified Extended

Not in model cards

Agents resolve real GitHub issues by editing codebases, scored by repository tests. Mercor adds 50 new expert-written tasks to the 500 public ones and reports both scores.

Held-out extension of swe-bench-verified. Mercor shows the original and extended score for each model. The month is approximate. The Wayback Machine first saved the earliest extended pages on 2026-08-15.

Made by Mercor Released Aug 2026 Fixing real repositories Public tasks plus a private test set
Level
Expert Specialists with years of training, often over hours of work
Scored
Checked automatically A program checks the result against an answer key, unit tests or the expected final state.
Answers
Code A program or patch run against tests.

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We read the headline results of 479 launch posts from 51 labs, and none of them list this benchmark.

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