The format for model names is: gpt-4-gizmo-*, which the system will automatically recognize. For instance, for this GPT: https://chat.openai.com/g/g-bo0FiWLY7-researchgpt, the model name should be entered as: gpt-4-gizmo-g-bo0FiWLY7.
{"id":"chatcmpl-123","object":"chat.completion","created":1677652288,"choices":[{"index":0,"message":{"role":"assistant","content":"\n\nHello there, how may I assist you today?"},"finish_reason":"stop"}],"usage":{"prompt_tokens":9,"completion_tokens":12,"total_tokens":21}}