> ## Documentation Index
> Fetch the complete documentation index at: https://docs.auriko.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# no_responses_endpoint

> HTTP 400 — Request requires the Response API but no provider supports it for this model.

## HTTP status

`400 invalid_request_error`

## Typical cause

You sent a request to `/v1/responses` for a model that isn't available via the Response API.

## Resolution

Switch to [Chat Completions](/api-reference/chat-completions) for this model, or choose a model with Response API support.