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DenseOn with the LateOn: Fully Open Dense and Late-Interaction Models for Multilingual, Long-Context, and Code Search

Research Information Retrieval

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Merged summary

TL;DR - This paper introduces fully open recipes, data, code, and models for dense and late-interaction retrieval. Late interaction notably generalizes better to languages and scripts excluded from translated training data.

  • DenseOn and LateOn are 149M-parameter models trained on 665M contrastive pairs and 1.88M supervised pairs with hard negatives.
  • They achieve 56.20 and 57.22 average nDCG@10 on BEIR, respectively, setting reported size-class records.
  • Multilingual variants use 2.8B pairs spanning eight translated languages and cross-lingual examples.
  • Token-level matching helps mLateOn outperform dense retrieval in generalization to unseen languages and scripts.

Sources (1)

DenseOn with the LateOn: Fully Open Dense and Late-Interaction Models for Multilingual, Long-Context, and Code Search

arXiv cs.CL Raphaël Sourty, Antoine Chaffin, Paulo Roberto Moura Junior, Amélie Chatelain 2026-07-29 arXiv:2607.27178
Public signals Hugging Face upvotes 6
Providers: Hugging Face · Upvotes 6 OpenAlex · N/A Publisher · N/A Semantic Scholar · N/A X · N/A Fetched 2026-08-28 14:33:32.820658 UTC

TL;DR - This paper introduces fully open recipes, data, code, and models for dense and late-interaction retrieval. Late interaction notably generalizes better to languages and scripts excluded from translated training data.

  • DenseOn and LateOn are 149M-parameter models trained on 665M contrastive pairs and 1.88M supervised pairs with hard negatives.
  • They achieve 56.20 and 57.22 average nDCG@10 on BEIR, respectively, setting reported size-class records.
  • Multilingual variants use 2.8B pairs spanning eight translated languages and cross-lingual examples.
  • Token-level matching helps mLateOn outperform dense retrieval in generalization to unseen languages and scripts.
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