Chat Completions

Reviewed by Proof · Updated

Definition

Chat completions is the luv13 endpoint that takes a list of messages and returns the model's next reply.

Key takeaways

  • The endpoint is POST https://api.luv13.ai/v1/chat/completions.
  • It uses the OpenAI chat completions format, so OpenAI SDKs and tools can call it once their base URL points at luv13.
  • The request luv13.ai/docs shows has two fields: model (an id from GET /v1/models, such as luv13/glm-5.3-flash) and messages.
  • It needs an API key. Without a valid one it returns HTTP 401 with "type": "invalid_auth".
  • Every model costs $0.33 per 1M tokens, input the same as output.

The request

Send JSON with your API key in the Authorization: Bearer header.

FieldWhat it is
modelThe model id, exactly as GET /v1/models lists it. See Model IDs.
messagesThe conversation, as a list of messages with a role and content.

Optional fields are covered on Request Parameters.

Example

This is the first request shown on luv13.ai/docs:

curl https://api.luv13.ai/v1/chat/completions \
  -H "Authorization: Bearer $LUV13_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model": "luv13/glm-5.3-flash", "messages": [{"role": "user", "content": "ping"}]}'

Without a valid key, the same request returns HTTP 401 and this body (checked live on 2026-09-30):

{"error":{"code":401,"message":"unauthorized","type":"invalid_auth"}}

The response

A successful reply comes back in the OpenAI chat completions format. For how that format is laid out, see Using the OpenAI SDKs.

To keep a conversation going, see Conversation History. If something goes wrong, see Errors and Status Codes.