Issue as described in topic. Switched assistants to GPT-4o, no longer receiving valid JSON when function calls are required. This breaks my assistant flow completely.
The only change made from the last stable version was the model (gpt-4-turbo to gpt-4o)
4o does not have a response_format parameter. https://platform.openai.com/docs/api-reference/chat/create#chat-create-response_format
You have to instruct it to produce the JSON given a schema and cross your fingers.
Was this issue ever solved? I am failing to get a JSON response from an assistant.