> ## 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.

# tools_with_structured_output_not_supported

> HTTP 400 — Model does not support tools with structured output.

## HTTP status

`400 invalid_request_error`

## Typical cause

The request combines `tools` with `response_format` (`json_object` or `json_schema`), but the selected model does not support using both together.

## Resolution

Remove `response_format` from the request, or choose a model that supports tools with structured output (e.g., GPT-4o, Claude 4.5+).