ResearchResearch paperEvaluation & Benchmarks · Safety & Alignment · Efficiency & Inference1 source · Oct 16, 2026

SWE-Bench Pro V2: A Cleaner, Harder-to-Game Coding Benchmark

SWE-Bench Pro is a widely used benchmark of long-horizon software engineering tasks for coding agents.

Key points

  • As agents improve, they reach task issues earlier agents never touched and interact with the evaluation environment in ways the original harness did not anticipate.
  • We present SWE-Bench Pro V2, a revised public split built to keep the benchmark accurate as capabilities advance.
  • Agentic audits, expert adjudication and blind re-implementation repaired or retired 480 of the 731 tasks: 23 contracted engineers spent 404 hours, each working in a language they write professionally, and every revised instruction was verified by a second engineer solving the task from the text alone.
  • We release the benchmark and distill lessons for maintaining agent benchmarks over time.

Sources (1)

  • [1]SWE-Bench Pro V2: A Cleaner, Harder-to-Game Coding Benchmark
    arXiv (AI, ML, NLP, CV, robotics, multi-agent) · Oct 16, 08:26 PM
    SWE-Bench Pro is a widely used benchmark of long-horizon software engineering tasks for coding agents.
    As agents improve, they reach task issues earlier agents never touched and interact with the evaluation environment in ways the original harness did not anticipate.

Extractive summary: sentences quoted from the sources.

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