ByteDance Seed's HarnessDev: Only 34 of 64 Harness Changes Generalize
Read original source →marktechpost.com
HarnessDev tests whether LLMs can build and evolve their own agent harnesses, finding self-built harnesses transfer poorly across models. GPT-5 solves 35.2% of Terminal-Bench 2.1 tasks in Terminus 2 but 49.6% in Codex CLI with identical weights.
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