AIMarkTechPostabout 1 hour ago
LLMs Engineer Agent Harnesses, 34 of 64 Changes Generalize
5 min read
HarnessDev, a framework from ByteDance Seed and collaborators, evaluates the runnable harness code an LLM writes, not the answer it produces. On Terminal-Bench 2.1, GPT-5 solves 35.2% of tasks in Terminus 2 but 49.6% in Codex CLI with identical weights, showing harness design is critical.
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