ResearchResearch paperEvaluation & Benchmarks · Agents & Tool Use2 sources · Oct 8, 2026

SWE-Duel: Towards a Self-Scaling Arena for Coding Agents

We introduce SWE-Duel, an arena in which two coding agents evaluate each other over mirrored Red-Blue turns.

Key points

  • Static coding benchmarks are fixed at release.
  • Over time their tasks leak into training data, and stronger agents eventually saturate them.
  • We argue that a benchmark should instead aim to be self-scaling: its tasks and oracles are created at evaluation time, so no content exists in advance to leak, and its difficulty is set by the participating agents rather than fixed at release.
  • The resulting pull request is admitted only if (1) it passes the feature tests and the repository's existing tests while failing exactly the bug tests, and (2) a fresh session of the same agent can repair the bug blind, which rules out unsolvable tasks.

Sources (2)

Extractive summary: sentences quoted from the sources.

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