Harnesses may be widening LM capability without creating true generalization

a1zhang · x · 2026-07-23

The post argues that the harness around an LM can reduce the burden of generalization: instead of relying only on the model’s internal mechanisms to “grok everything,” the setup can make the model see at test time the same kinds of things it saw during evaluation.

A reply pushes back on the stronger claim that harnesses help generalization in the compositional sense. The counterpoint is that harnesses likely expand the class of tasks LMs can solve, especially in code-like settings, but that success may come from scaffolding rather than true generalization.

Related event: Researchers Debate: Does LLM Generalization Come from the Model or the Harness?(8 posts)→

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