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llama.cpp OpenAI compatible server: serve a local model

Start llama serve to give your apps an OpenAI-style endpoint and a built-in web UI.

Who it is forA developer whose app uses the OpenAI SDK and who wants to test against a free local model.

The problemPaying for API calls during development adds up.

The outcomeA local OpenAI-compatible server your existing code can point at.

What you need first

  • macOS, Linux or Windows
  • Enough RAM or VRAM for the chosen GGUF model

Steps

  1. Install llama.cpp
  2. Run llama serve -hf ggml-org/Qwen3.5-0.8B-GGUF
  3. Open the built-in web UI to test
  4. Point your OpenAI client base URL at the local server

Prompt for your agent

Start `llama serve -hf ggml-org/Qwen3.5-0.8B-GGUF`, then send one chat completion from <app> to it. Confirm the response came from the local server, not a cloud API.

Caveat. Small models like the 0.8B example are fast but much weaker than hosted frontier models.

Use this in your AI agent

Ask your agent

Using the Deduped MCP, get the setup steps for ggml-org/llama.cpp and "Serve a local model behind an OpenAI-compatible API"

Add Deduped to Claude Code once

claude mcp add --transport http deduped https://dedupedai.com/mcp

Cursor, ChatGPT, others

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