Invalid type for 'max_tokens': expected a supported value, but received null.

The error you are encountering, "Invalid type for 'max_tokens': expected an unsupported value, but got null instead," is likely due to the following reasons:

Missing Parameter

The max_tokens parameter is required for the OpenAI API requests, but in your case, it seems this parameter is not being provided or is set to null, which is not acceptable.

Parameter Compatibility

There might be a misunderstanding or mismatch between the API parameters used. For example, different models (like GPT-4 vs o1 series) have different requirements regarding max_tokens and max_completion_tokens, and using the wrong parameter can result in errors.

Invalid Request Format

The API expects max_tokens to be a positive integer, and any other value, including null, will result in an error. This could be due to an incorrect data type or an unintended null value being passed in the request.