> ## 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.

# streaming_not_supported

> HTTP 400 — Model does not support streaming.

## HTTP status

`400 invalid_request_error`

## Typical cause

The request sets `stream: true` but the selected model does not support streaming responses.

## Resolution

Set `stream: false` or choose a model that supports streaming. Some models, such as `gpt-5.5-pro` and `o3-pro`, never stream and respond only via the [Response API](/response-api/overview).