Evaluation Harness
Also called Eval harness
An evaluation harness is software that runs evaluation tasks against models or systems and collects results. It connects task definitions, model execution, and scoring into a repeatable testing process.
[EleutherAI]In practice · hypothetical example
A team runs the same question set and scoring rules against two model versions.
[EleutherAI]A little deeper
EleutherAI’s harness is one implementation for language-model tasks. A harness supplies testing infrastructure; its usefulness still depends on the tasks and metrics selected. [EleutherAI]
A common mix-up
An evaluation harness and an agent harness are interchangeable.
One organizes tests; the other runs an agent’s working interactions. [EleutherAI]
Which component runs a shared test suite and collects scores?
Sources & editorial notes
Evidence: supported. Primary-source support for this scoped entry; publication approved by the project owner.
- Language Model Evaluation Harness ↗ (opens in new tab)EleutherAI · Publication date unknown
Relevant section: Overview
Last editorial review: 2026-09-13 by project-owner.
First observed in this corpus: Unknown.
Revision history
Revision 2 · Created 2026-09-13 · Updated 2026-09-13
Project owner approved the current content for publication. Existing evidence scope and limitations remain applicable.