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API / RESPONSES

Responses API

For apps already on the OpenAI Responses SDK. Currently used with GPT-family models.

!

This page is the preview integration contract for individual Mengbi Router users. Examples will remain compatible when the production gateway opens.

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Responses API

For applications already using the OpenAI Responses SDK. Currently intended for GPT models.

Basic request

POST /v1/responses
bash
curl https://router-api.mengbi-ai.net/v1/responses \
  -H "Authorization: Bearer sk-mengbi-xxxxxx" \
  -H "content-type: application/json" \
  -d '{
    "model": "gpt-5.6-sol",
    "input": "Introduce yourself in one sentence"
  }'

NoteUse /v1/messages for Claude and the Gemini native format for Gemini. Sending an incompatible model to /v1/responses returns an error.

Fast mode

If the model catalog marks a model as supporting fast mode, add service_tier: fast to Chat Completions or Responses API requests. Confirm availability from the model catalog and response.

json
{
  "model": "gpt-5.6-sol",
  "input": "Analyze this requirement",
  "service_tier": "fast"
}