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.

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#api design #llm #distributed systems
LLM APIs are a Synchronization Problem

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