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Direct Judgement Preference Optimization

Paper · 2025 · PeiFeng Wang, Austin Xu, Yilun Zhou et al.

Summary

LLM-as-judge models are usually trained with supervised finetuning on fairly small datasets and cover only narrow evaluation formats, often just pairwise comparison. As a result, they transfer poorly to other domains and tasks. The authors from Salesforce AI Research aim instead for "foundational" judges that accept flexible criteria and handle several evaluation formats. They assemble about 680K training samples covering four tasks: single rating, pairwise comparison, binary classification, and a new auxiliary task called response deduction. Using a teacher LLM's sampled outputs and ground-truth labels, they build three kinds of DPO preference pairs: CoT critique, standard judgement without a critique, and response deduction, where the judge reconstructs the evaluated response. Training combines a DPO loss with an SFT term on the preferred outputs. The resulting SFR-Judge family comes in 8B, 12B and 70B sizes. Across 13 benchmarks, SFR-Judge-70B achieves the best aggregate score, and even the 8B model surpasses GPT-4o on pairwise tasks. The judges also work well as starting points for further domain-specific finetuning.

Key points

  • Training data and pairs: 680K samples were used to form three preference-pair types.
    • CoT critique pairs are labelled by whether the judgement matches the gold label.
    • Standard judgement pairs drop the critique so the verdict tokens get a direct training signal.
    • Response deduction pairs take negatives from a weaker teacher model.
  • Evaluation suite: It covers 13 benchmarks (7 pairwise, 4 single rating, 2 classification), including safety and summarization domains, many of them unseen during training.
  • Specialization experiment: SFR-Judge-8B was further finetuned with DPO at β = 0.01.
    • It reaches 55.6% on ContextualJudgeBench, slightly above o1 (55.3%).
    • The same procedure applied to Llama-3.1-8B-Instruct gives only 45.2%.
  • Additional findings: The judges are robust on EvalBiasBench and generalize to unseen prompts and criteria. Standard judgement training also lets them skip reasoning when fast inference is needed.
  • Limitations: The work is English-only and depends on annotated judgements. Code is available at github.com/SalesforceAIResearch/sfrjudge.

Our summary of the paper, in our own words — not its text. The work belongs to its authors; read it at the links above.

 Institutions

 Fields, topics and concepts

Cite

Cite as PeiFeng Wang, Austin Xu, Yilun Zhou, Caiming Xiong and Shafiq Joty. 2025. Direct Judgement Preference Optimization. Proceedings of the 2025 Conference on Empirical Methods in Natural Language Processing.

The paper itself, not this page. BibTeX from the library's record of the work. DOI 10.18653/v1/2025.emnlp-main.103

@inproceedings{wang2025direct,
  title = {{Direct Judgement Preference Optimization}},
  author = {PeiFeng Wang, Austin Xu, Yilun Zhou, Caiming Xiong and Shafiq Joty},
  booktitle = {Proceedings of the 2025 Conference on Empirical Methods in Natural Language Processing},
  year = {2025},
  doi = {10.18653/v1/2025.emnlp-main.103},
  url = {https://doi.org/10.18653/v1/2025.emnlp-main.103}
}

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