Armin Ronacher 11/22/2025

LLM APIs are a Synchronization Problem

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The article argues that current LLM provider APIs are a flawed abstraction, framing them as a distributed state synchronization problem. It contrasts the local state of a model (tokens in RAM, KV cache on GPU) with the abstractions of completion APIs, exploring the mismatch between the model's internal working state and the API surface exposed to developers.

LLM APIs are a Synchronization Problem

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