This was the response that I got from the GPT-4 API yesterday:

{'id': 'chatcmpl-7uVF5xGqR1oEzXITw3WZYsnB4Yzt8', 'object': 'chat.completion', 'created': 1693700819, 'model': 'gpt-4-0613', 'choices': [{'index': 0, 'message': {'role': 'assistant', 'content': '353538'}, 'finish_reason': 'stop'}], 'usage': {'prompt_tokens': 11, 'completion_tokens': 2, 'total_tokens': 13}}

Maybe they fine-tuned the ChatGPT version better, or fed it to an calculator.