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Language Model Evaluation Harness

EleutherAI / lm-evaluation-harness

A framework for evaluating language models on benchmark tasks with configurable prompts, metrics and local or API-based model backends.

Evaluation & Benchmarks

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About Language Model Evaluation Harness

Comparing model checkpoints requires consistent task definitions, prompts and scoring across inference backends.

Who it’s for

  • Researchers evaluating language-model checkpoints
  • Teams comparing local and hosted models

When to consider it

Consider Language Model Evaluation Harness when you need reusable benchmark tasks and configurable evaluation runs across model backends.

Tradeoffs & limitations

  • MIT licensed. Model backends are optional extras and must be installed separately; the base package does not include Transformers or PyTorch.

SOTA overview · Documentation-based assessment · Sources & review method

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Sources & review method

Documentation-based assessment · Oct 30, 2026 · Prepared with AI assistance; not a hands-on benchmark.

Checked by SOTA · AI-assisted documentation review. Selection advice is our assessment; verify current requirements for your deployment.

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Import history & original evidence

Language Model Evaluation Harness official repository

Scope: Product overview · Imported Oct 30, 2026 · MIT

A framework for evaluating language models on benchmark tasks with configurable prompts, metrics and local or API-based model backends.

Based on official pages and announcements checked on 2026-10-30. No hands-on test, performance benchmark or popularity ranking is claimed.