MEMO: Memory as a Model

MEMO (Memory as a Model), a modular framework designed to integrate new, domain-specific knowledge into Large Language Models (LLMs) without the need for expensive retraining. By encoding information into a dedicated, smaller MEMORY model while keeping the primary EXECUTIVE model frozen, the system avoids catastrophic forgetting and remains compatible with proprietary, closed-source models. The process involves a five-step data synthesis pipeline that converts raw documents into a structured question-answer dataset of "reflections" that capture complex, cross-document relationships. At inference, the EXECUTIVE model retrieves information through a structured multi-turn protocol, decomposing difficult queries into targeted sub-questions. Empirical results across multiple benchmarks demonstrate that MEMO is more robust to retrieval noise than standard methods and achieves superior performance by leveraging internalized parametric knowledge. Furthermore, the framework supports continual knowledge integration through model merging, allowing new data to be added efficiently while maintaining a retrieval cost that is independent of the overall corpus size.