Unlocking the Working Memory of Large Language Models for Latent Reasoning
Researchers propose Reasoning in Memory (RiM), a technique that decouples internal reasoning from token generation by using fixed memory blocks instead of autoregressive intermediate steps. This addresses a fundamental inefficiency in current LLM inference: scaling test-time compute forces models to externalize all reasoning as tokens, conflating thought with output. By enabling latent computation within reserved token slots, RiM could unlock more efficient scaling of reasoning without bloating sequence length or generation cost, potentially reshaping how practitioners approach chain-of-thought and similar inference-time strategies.
Modelwire context
ExplainerThe core bet RiM makes is that the token stream is the wrong medium for intermediate computation, not just an inefficient one. Treating reserved memory slots as a scratchpad that never surfaces to the output layer is a structural departure from how chain-of-thought and its variants work, where the reasoning trace and the answer occupy the same sequence.
This sits in a cluster of inference-efficiency and model-transparency research that Modelwire has been tracking closely. The LLMSurgeon piece from the same day approaches LLMs as systems whose internal behavior can be forensically analyzed from outputs alone, and RiM is essentially the inverse concern: keeping certain internal computations from ever becoming outputs at all. Neither paper is directly building on the other, but together they highlight a growing research interest in the gap between what models compute and what they surface. The SchGen coverage from this week is largely disconnected from this thread.
The critical test is whether RiM's latency and quality gains hold on multi-step reasoning benchmarks (MATH-500 or GPQA) under third-party replication, since fixed memory block approaches have historically shown degradation on problems requiring dynamic reasoning depth.
Coverage we drew on
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MentionsReasoning in Memory (RiM) · Large Language Models
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