The Two Towers for Estonian-Centric and Finno-Ugric Machine Translation

Mark Fishel, Lisa Yankovskaya


Abstract
We present two open-weight translation models for Estonian and its low-resource "relatives" in the Finno-Ugric language family. The training data includes 12 languages paired with Estonian as well as 23 more Finno-Ugric languages and varieties, ranging from mid-resource examples with tens of thousands of speakers to extremely low-resource critically endangered languages with less than a hundred speakers. The translation models use Unbabel Tower+ 2B and 9B as their starting point. We compare their performance on two benchmarks to DeepL and GPT-5.2 and show that in most cases we surpass the quality of DeepL and match or nearly match the quality of GPT-5.2’s output with just a fraction of the parameters. Among other contributions we also restore the paragraph structure of a massive synthetic multiparallel corpus for Estonian translation and use it in training the models. The resulting models, training scripts and training data are released openly (to be made public upon de-anonymization).
Anthology ID:
2026.eamt-1.32
Volume:
Proceedings of the 26th Annual Conference of the European Association for Machine Translation (Volume 1)
Month:
June
Year:
2026
Address:
Tilburg, The Netherlands
Editors:
Dimitar Shterionov, Eva Vanmassenhove, Mirella De Sisto, Fred Blain, Javad Pourmostafa Roshan Sharami, Lisa Lepp, Chiara Manna, Argentina Anna Rescigno, Alina Karakanta, Ayla Rigouts Terryn, Manuel Lardelli, Natalia Resende, Elena Murgolo, Janiça Hackenbuchner, Anna Zaretskaya, Miquel Esplà-Gomis, Thierry Etchegoyhen, Dagmar Gromann, Rachel Bawden, Barry Haddow, Sara Szoc, Mikel Forcada, Helena Moniz
Venue:
EAMT
SIG:
Publisher:
European Association for Machine Translation
Note:
Pages:
515–527
Language:
URL:
https://aclanthology.org/2026.eamt-1.32/
DOI:
Bibkey:
Cite (ACL):
Mark Fishel and Lisa Yankovskaya. 2026. The Two Towers for Estonian-Centric and Finno-Ugric Machine Translation. In Proceedings of the 26th Annual Conference of the European Association for Machine Translation (Volume 1), pages 515–527, Tilburg, The Netherlands. European Association for Machine Translation.
Cite (Informal):
The Two Towers for Estonian-Centric and Finno-Ugric Machine Translation (Fishel & Yankovskaya, EAMT 2026)
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PDF:
https://aclanthology.org/2026.eamt-1.32.pdf