AI ResearchAug 19, 2026, 5:54 PM

Beyond Teacher Likelihood: Group-Calibrated On-Policy Distillation for Long-Context Reasoning

30-second summary

Researchers introduce Group-Calibrated On-Policy Distillation ( practices) to fix errors in long-context reasoning during model training.

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Key takeaways
  • practices addresses the mismatch between local token guidance and global task success.
  • practices uses task-specific verifiers to provide graded rewards for response-level completion.
  • The method improves performance in evidence-aggregation tasks across long input ranges.
Full story

Current on-policy distillation methods often fail when handling long-context tasks because they rely on token-level guidance from a teacher model. This approach can lead the student model to prioritize locally plausible text Base while ignoring global constraints or evidence spread across a large input iter.

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Glossary
On-policy distillation
A training method where a student model learns from its own generated responses using guidance from a larger teacher model.
The process of training a model based on the distribution of its own outputs.
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