TLPO: Token-Level Policy Optimization for Mitigating Language Confusion in Large Language Models

📰 ArXiv cs.AI

Learn to mitigate language confusion in large language models using token-level policy optimization, improving multilingual response generation

advanced Published 30 Apr 2026
Action Steps
  1. Implement token-level policy optimization using TLPO to mitigate language confusion in LLMs
  2. Fine-tune LLMs at the token level to improve language consistency
  3. Evaluate the performance of TLPO against sequence-level fine-tuning methods like DPO, ORPO, and GRPO
  4. Apply TLPO to real-world multilingual applications to assess its effectiveness
  5. Compare the results of TLPO with other mitigation approaches to identify the most effective method
Who Needs to Know This

NLP engineers and researchers working on large language models can benefit from this technique to improve model performance and consistency in multilingual settings

Key Insight

💡 Token-level policy optimization can improve language consistency in LLMs without degrading general model capabilities

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🚀 Mitigate language confusion in LLMs with token-level policy optimization! 🤖

Key Takeaways

Learn to mitigate language confusion in large language models using token-level policy optimization, improving multilingual response generation

Full Article

Title: TLPO: Token-Level Policy Optimization for Mitigating Language Confusion in Large Language Models

Abstract:
arXiv:2604.26553v1 Announce Type: cross Abstract: Large language models (LLMs) demonstrate strong multilingual capabilities, yet often fail to consistently generate responses in the intended language, exhibiting a phenomenon known as language confusion. Prior mitigation approaches based on sequence-level fine-tuning, such as DPO, ORPO, and GRPO, operate at the level of entire responses and can lead to unintended degradation of general model capabilities, motivating the need for more fine-grained
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