LMSYS Introduces Unified Radix Cache for Hybrid Model Prefix Caching
hsu_byron · x · 2026-08-11
LMSYS published a new blog post introducing Unified Radix Cache to solve the complexities of prefix caching in hybrid models. Previously, different attention mechanisms had their own cache reuse semantics, causing specialized cache classes to multiply combinatorially and duplicate tree logic.
The new architecture brings everything into a single shared tree:
- Uses a token-keyed radix topology for canonical prefix identity, with composable components for architecture-specific reuse semantics.
- Natively supports HiCache and session-aware eviction, built specifically for agentic workloads.
- Features a clean separation between the controller and tree core, making the core replaceable (including an experimental Rust implementation).
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