Invalid input: expected a non-empty array but received an empty array. Ensure to provide an array with at least one element.

The "400 Bad Request" error in the OpenAI API can be triggered by several reasons, here are some of the key causes:

Invalid or Expired API Keys

An incorrect or expired API key can lead to a 400 error. This is because the API key is essential for authenticating your requests, and any issues with it will result in the server not understanding your request.

Incorrect Request Syntax or Configuration

The request may contain invalid syntax or configuration. For example, if the messages array is empty or does not contain the required content field, it will result in a 400 error. The API expects the messages array to have at least one object with a non-empty content field.

Middleware and Library Issues

Incorrect configuration of libraries like Axios can also cause this error. This includes issues with the base URL, headers (especially the Authorization field), or other request parameters.

Rate Limiting and Throttling

Exceeding the rate limits imposed by OpenAI can result in a 400 error. If your application makes too many requests within a given time frame, the API will reject further requests until the rate limit resets.

Model-Specific Errors

Sometimes, the error can be specific to the model you are using. For example, attempting to specify dimensions for a model that does not support it can lead to a 400 error.

Data Type Mismatch

Passing the wrong data type in your request can also trigger this error. For instance, passing a string when an object is expected, or vice versa, will result in a "Bad Request" error.