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Teaching LLMs to Update Beliefs for Efficient Long-Horizon Interaction

Research LLM Agents

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TL;DR - ABBEL trains long-horizon LLM agents to replace full interaction histories with supervised natural-language belief states. It narrows the performance gap from context compaction while reducing memory use and training requirements.

  • Belief grading rewards states that retain enough information to reconstruct recent observations.
  • On CollabBench, ABBEL recovered roughly half the gap to full-context models and trained in 50% fewer steps than ungraded summarization.
  • Domain-specific grading approached or exceeded full-context learning efficiency on Combination Lock.
  • Penalizing peak belief length reduced memory use in multi-objective QA with minimal performance loss.

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Teaching LLMs to Update Beliefs for Efficient Long-Horizon Interaction

BAIR 2026-07-26
Public signals N/A
Providers: Hugging Face · N/A OpenAlex · N/A Publisher · N/A Semantic Scholar · N/A X · N/A Fetched 2026-08-26 14:46:13.400673 UTC

TL;DR - ABBEL trains long-horizon LLM agents to replace full interaction histories with supervised natural-language belief states. It narrows the performance gap from context compaction while reducing memory use and training requirements.

  • Belief grading rewards states that retain enough information to reconstruct recent observations.
  • On CollabBench, ABBEL recovered roughly half the gap to full-context models and trained in 50% fewer steps than ungraded summarization.
  • Domain-specific grading approached or exceeded full-context learning efficiency on Combination Lock.
  • Penalizing peak belief length reduced memory use in multi-objective QA with minimal performance loss.
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