Unfortunately this is not reliable, many Non-GPT models happily claim to be GPT-4 e.g.
> I'm ChatGPT, a virtual assistant powered by artificial intelligence, specifically designed by OpenAI based on the GPT-4 model. I can help answer questions, provide explanations, generate text based on prompts, and assist with a wide range of topics. Whether you need help with information, learning something new, solving problems, or just looking for a chat, I'm here to assist!
Yes, that's it.
The training data and the system prompt but yes.