Responses

/v1/responses is the OpenAI Responses API compatible entrypoint for Codex CLI and Responses protocol clients.

Interface

Item	Value
Method	POST
Path	/v1/responses, /v1/responses/*
Content-Type	application/json
Authentication	Authorization: Bearer YOUR_API_KEY

Request Parameters

Parameter	Type	Required	Description
model	string	Yes	Requested model.
input	string or array	Yes	Responses API input.
stream	boolean	No	Whether to stream the response.
instructions	string	No	System-level instructions.
reasoning	object	No	Reasoning configuration, applied by model capability.
tools	array	No	Tool definitions, depending on upstream and compatibility support.

Request Example

curl https://llmapi.site/v1/responses \
  -H 'Authorization: Bearer YOUR_API_KEY' \
  -H 'Content-Type: application/json' \
  -d '{
    "model": "gpt-5.1",
    "input": "Write a concise release note.",
    "stream": false
  }'

Response Example

{
  "id": "resp_123",
  "object": "response",
  "status": "completed",
  "model": "gpt-5.1",
  "output": []
}

WebSocket Compatibility Entry

GET /v1/responses is an OpenAI Responses WebSocket compatibility entry for specific clients.

Compatible Paths

/responses without /v1 and the Codex-specific /backend-api/codex/responses are also registered. See Aliases.