> ## 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.

# structured_output_not_supported

> HTTP 400 — Model does not support structured output.

## HTTP status

`400 invalid_request_error`

## Typical cause

The request sets `response_format: { type: "json_schema", ... }` but the selected model does not support structured output with a JSON schema.

## Resolution

Remove the structured output format, use JSON mode instead if the model supports it, or choose a model that supports structured output.