> ## 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.

# json_mode_not_supported

> HTTP 400 — Model does not support JSON mode.

## HTTP status

`400 invalid_request_error`

## Typical cause

The request sets `response_format: { type: "json_object" }` but the selected model does not support JSON mode output.

## Resolution

Remove the `response_format` parameter or choose a model that supports JSON mode.