OpenAI: KV Cache is the largest and fastest-growing data structure in agentic inference

BenBajarin · x · 2026-08-26

OpenAI shared insights on agentic inference infrastructure at Hot Chips. They argue that the KV cache is the primary bottleneck and data structure challenge. They believe that moving large KV states is not a long-term solution, noting that disaggregated prefill is merely a workaround for GPUs to build large batches for efficient sampling.

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