# LongBench

LongBench is an AI benchmark; this page records what it measures and traces its data, grader, and scores to primary sources.

Evaluates bilingual long-context understanding across single- and multi-document question answering, summarization, few-shot learning, and code.

## Details

- Address: Online, Global
- Website: [longbench.github.io/](<https://longbench.github.io/>)
- Tags: Helpful, Science
- Category: Memory
- Status: Active
- Data licence: MIT
- Data access: open
- Grader: mixed
- Organization: THUDM
- Released: 2023-08
- Paper: [arxiv.org/abs/2308.14508](<https://arxiv.org/abs/2308.14508>)
- Leaderboard: [longbench.github.io/](<https://longbench.github.io/>)
- Repository: [github.com/THUDM/LongBench](<https://github.com/THUDM/LongBench>)
- Task count: 21
- Top-score provenance: unknown
- ABI family: No

## Questions

### Where is LongBench?

LongBench is at Online, Global.

### How do I contact LongBench?

To contact LongBench, visit https://longbench.github.io/.

## Source

From [Benchmark primary sources](https://aibenchmarkindex.com/about), license CC0-1.0, checked 2026-10-15.

Last updated October 15, 2026.

## Links

- This benchmark on the [web page](<https://aibenchmarkindex.com/global/online/longbench>)
- [Memory in Online](<https://aibenchmarkindex.com/global/online/category/memory.md>)
- [More benchmarks in Online](<https://aibenchmarkindex.com/global/online.md>)

> **Check before you compare.** Benchmark methods and leaderboards change. Follow the cited primary source before using a result in a decision.