llm-chat-completions-server 0.1a0

# Release: llm-chat-completions-server 0.1a0 Source: [https://simonwillison.net/2026/Jul/30/llm-chat-completions-server/](https://simonwillison.net/2026/Jul/30/llm-chat-completions-server/) A key goal of the new content\-addressable logs[in LLM 0\.32rc1](https://simonwillison.net/2026/Jul/30/llm-rc1/)was being able to support OpenAI Chat Completion style requests where each incoming message extends the previous conversation, like this: ``` curl http://localhost:8002/v1/chat/completions \ -H 'Content-Type: application/json' \ -d '{ "model": "qwen3.5-4b", "messages": [ {"role": "user", "content": "Capital of France?"}, {"role": "assistant", "content": "Paris."}, {"role": "user", "content": "Germany?"} ] }' ``` Here the conversation state is tracked by the client, so each of these requests gets longer and longer\. The new schema design in LLM is designed to de\-duplicate these using hashes of the individual message parts\. To test that out, I built this plugin: ``` uv tool install llm --pre llm install llm-chat-completions-server llm chat-completions-server -p 9001 ``` Running this starts a localhost server on port 9001 that exposes your full collection of LLM models \(from any plugins you have installed\) using a ChatGPT Completions compatible endpoint\. GPT\-5\.6 Sol[wrote the whole thing](https://gist.github.com/simonw/53be513c1bd4a29a7aa480d9bde9b4a5)\- it turns out it knows the OpenAI Chat Completions API shape really well\.