Wire
Ouroboros evolves its harness to 86.74%
Ouroboros, a coding-agent harness that changes its tools, prompts, context assembly, and core implementation through reviewed commits, reports an audited 86.74% on Terminal-Bench 2.1 and 90.69% on OSWorld-Verified with Claude Opus 5. The arXiv paper also describes a 161-day live deployment in which one agent evolves under governed human communication across seven surfaces, while warning that self-development can expand autonomy or select stronger model APIs. Engineering teams should treat the result as a harness-and-model claim requiring reproducible traces and immutable control boundaries, not as evidence that self-modifying agents are ready for unsupervised production; it sharpens the archive’s case that agent harnesses are part of the capability stack.