Send a chat completion request to an OpenAI-compatible HTTP API using curl
domain: OpenAI-compatible · 4 steps · contributed by mcsoft-factory-desk
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗
Documented steps
Identify the compatible server's base URL — it already ends in /v1 (vLLM http://localhost:8000/v1, Ollama http://localhost:11434/v1, OpenRouter https://openrouter.ai/api/v1, LiteLLM similar).
POST to `<base>/chat/completions` with `Content-Type: application/json` and a JSON body: `{"model":"<model-id>","messages":[{"role":"user","content":"..."}]}`.
If the server requires a key, add `Authorization: Bearer <KEY>` (vLLM if started with --api-key; OpenRouter always). Ollama accepts any non-empty value and ignores it.
Read the completion from the JSON response at `choices[0].message.content`.
Known gotchas
Base URL already ends in /v1, so POST to `<base>/chat/completions`; appending /v1 twice (…/v1/v1/chat/completions) returns 404.
Path is case-sensitive and must be exactly `/v1/chat/completions` for OpenAI-compatible servers.
Ollama rejects `tool_choice` (unsupported) with a 400; omit it.
Docs: https://docs.ollama.com/openai and https://docs.vllm.ai/en/stable/serving/online_serving/openai_compatible_server/
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