# WMT24++: Expanding the Language Coverage of WMT24 to 55 Languages & Dialects

arXiv: https://arxiv.org/abs/2502.12404 · HTML: https://mlsanity.com/paper/2502.12404/

## Key facts

- Cited by 79 papers in the map (data through 14 Oct 2026).
- First posted on arXiv 18 Feb 2025.

## Built on by (most cited first, 30 of 79)

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- [Expanding the WMT24++ Benchmark with Rumantsch Grischun, Sursilvan, Sutsilvan, Surmiran, Puter, and Vallader](https://mlsanity.com/paper/2509.03148/) (2025)
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- [GRRM: Group Relative Reward Modeling for Machine Translation](https://mlsanity.com/paper/2602.14028/) (2026)

## Abstract (arXiv)

As large language models (LLM) become more and more capable in languages other than English, it is important to collect benchmark datasets in order to evaluate their multilingual performance, including on tasks like machine translation (MT). In this work, we extend the WMT24 dataset to cover 55 languages by collecting new human-written references and post-edits for 46 new languages and dialects in addition to post-edits of the references in 8 out of 9 languages in the original WMT24 dataset. The dataset covers four domains: literary, news, social, and speech. We benchmark a variety of MT providers and LLMs on the collected dataset using automatic metrics and find that LLMs are the best-performing MT systems in all 55 languages. These results should be confirmed using a human-based evaluation, which we leave for future work.