How to get logprobs from openai?

[ewvikienkr]

input

from haystack.components.generators import OpenAIGenerator

client = OpenAIGenerator(generation_kwargs={"max_tokens": 10})
response = client.run("Say hello", generation_kwargs={"logprobs": True, "top_logprobs": 2})
print(response)

Output
{'replies': ['Hello! How can I assist you today?'], 'meta': [{'model': 'gpt-3.5-turbo-0125', 'index': 0, 'finish_reason': 'stop', 'usage': {'completion_tokens': 9, 'prompt_tokens': 9, 'total_tokens': 18}}]}

As you can see logprobs nor top_logprobs are included even though they are supported parameters https://platform.openai.com/docs/api-reference/chat/create?lang=python.

Am I doing something wrong or is this actually not supported?