Invalid schema for response_format: Expected at most a specified number of enum values in total within a single schema when using structured outputs, but received an excess. Consider reducing the number of enums, or opt out of structured outputs by setting 'strict: false'.

The 400 status error in the Azure OpenAI API, specifically related to the "Invalid schema for response_format," is likely due to the following reasons:

Exceeding Enum Value Limits

The error message indicates that the schema contains more than the allowed 500 enum values within a single schema when using structured outputs. This exceeds the predefined limit, leading to the "Bad Request" response.

Structured Output Constraints

The issue is tied to the use of structured outputs, which have specific constraints, such as the maximum number of enum values allowed in the schema. This constraint is in place to maintain the integrity and performance of the API.

Schema Complexity

The complexity of the schema, particularly the number of enum values and potentially other structural elements, is triggering the validation check that results in the 400 error.