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AI evaluation and generalization

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Evolved harnesses generalize beyond their original benchmarks

IN CONTEXTAI evaluation and generalization1 viewpoints
2026-07-04

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Evolved harnesses generalize beyond their original benchmarks

A harness evolved on Terminal-Bench-2 transferred without further evolution to SWE-bench-verified, indicating it encodes general engineering experience in harness components rather than benchmark-specific optimization.

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Supporting evidence

Harness Engineering for Self-Improvement

Original excerpt

On Terminal-Bench-2, AHE achieved better than human-designed harness (OpenCode, Terminus-2, Codex) except for Hard tier and a few other self-evolve baselines (ACE, TF-GRPO). The same frozen harness, without further evolving, transfers to SWE-bench-verified, indicating that the evolved harness is able to encode engineering experience into harness components rather than doing benchmark-specific optimization.

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