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Seed-X: Building Strong Multilingual Translation LLM with 7B Parameters

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arxiv 2507.13618 v4 pith:5D4YCYKP submitted 2025-07-18 cs.CL cs.AI

Seed-X: Building Strong Multilingual Translation LLM with 7B Parameters

classification cs.CL cs.AI
keywords modelstranslationacrosslanguagemultilingualseed-xdiverseinstruct
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Multilingual translation stands as a challenging task for large language models (LLMs) to handle intricate language patterns and stilted translations that arise in automated translations. In this paper, we introduce Seed-X, a family of open-source LLMs comprising instruct and reasoning models, pushing the limits of translation capability with 7B parameter size. The base model is pre-trained on a diverse, high-quality dataset encompassing both monolingual and bilingual content across 28 languages, harnessing the full potential of multilingual data. The instruct model is then finetuned to translate by Chain-of-Thought (CoT) reasoning and further enhanced through reinforcement learning (RL) to achieve better generalization across diverse language pairs. Seed-X achieves performance comparable to leading closed-source models, including Gemini-2.5 and GPT-4o, across 28 languages, and significantly outperforms larger open-source models in both automatic metrics and human evaluations. We share the best practices through our optimization process, and make the parameter public available for advancing translation research and applications.

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