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Frontier reasoning models answer with an outdated value when the facts change mid-conversation, and the authors traced the cause to attention drift rather than to missing memory

AspireAI community · arXiv
When preferences, goals or facts change, an LLM agent has to use the current state while earlier versions of the same variable sit in its context, and models often answer with the stale value. This paper names that failure stale binding and introduces Controlled In-Context Memory, a benchmark for tracking updated information across conversations and agent logs, finding that even frontier reasoning models fail to recover the current state. The interesting part is the mechanism: in open-source models the updated value is still recoverable by probing, which points to a failure to select available information rather than to information loss, and component tests in Qwen and Pythia identify attention drift, where attention favors several old values over the current one when scores are close. A one-layer transformer analysis shows why, and redirecting attention toward the current value without any further training corrects most old-value errors across model families while preserving nearly all initially correct answers. The honest caveat is that the intervention is per-input and the work does not yet translate into a training recipe.
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