Open-source openJiuwen harness boosts SWE-bench scores via runtime adaptation
omarsar0 · x · 2026-09-02
openJiuwen is an open-source agent harness designed to fix the static nature of current coding agent setups.
Key Features:
- Rail-based composition: Allows developers to assemble single agents, sub-agents, and swarm flows over a shared execution substrate.
- Runtime adaptation: Uses evidence from semantic diagnostics, execution outcomes, and progress to reshape context and control during the run.
Performance:
- Achieved 82.6% on SWE-bench Verified and 87.19% on Terminal-Bench 2.1, outperforming the strongest official leaderboard entries by over 3 points.
The gains are attributed to the harness's dynamic capabilities rather than the underlying model policy.
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