EleutherAI/lm-evaluation-harness

Plans to add new long-context benchmark like LongBench v2, Babilong, InfiniteBench datasets?

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#3,224 opened on Aug 8, 2025

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good first issuehelp wanted

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Description

Hi lm-eval team, I am wondering if there are plans to add LongBench v2, Babilong, InfiniteBench, and Phonebook datasets to the evaluation tasks? These are useful for long-context LLM evaluation.

Thanks!

Contributor guide

Research direction
Examine existing benchmark integrations in the lm eval framework (e.g., in `lm eval/tasks/`) to understand the pattern for adding new tasks. Then implement the specified datasets (LongBench v2, Babilong, InfiniteBench) following that pattern.
Tech stack
python
Domain
backend
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
GitPython
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
50