The provided input does not match the expected type. Ensure that parameters like 'prompt' are correctly formatted as strings.

The 400 status error you are encountering with the OpenAI API is likely due to several possible reasons related to the request's validity and configuration:

Invalid Request Structure

The error message indicates that the prompt parameter is not of the correct type. In the OpenAI API, the prompt should be a string, but your request is passing a more complex data structure ({'input_variables': ['augmented_query'], 'template': 'Write a creative, engaging story...', ...}) which does not match the expected string format.

Incorrect API Request Parameters

The API expects specific parameters to be in a certain format. If the parameters, such as the prompt, do not conform to the specified structure or type, it will result in a "Bad Request" error.

Validation of Request Content

The OpenAI API strictly validates the content of the request. If any part of the request, including headers or the payload, does not meet the API's requirements, it will return a 400 error. For example, issues like extra or malformed headers can trigger this error.

In your case, the specific error message suggests that the prompt field is not a string as required, leading to an invalid request.