GPT-1: Hello. I am a large language model developed by OpenAI called GPT.

GPT-2: Hello. I am a large language model developed by OpenAI called GPT-2.

GPT-3: Hello. How may I assist you today?

GPT-3.5: Hello! How can I assist you today?

GPT-3.5-Turbo: Hello! How are you?

GPT-3.5-Turbo-Instruct: Greetings. How may I be of assistance to you today?

GPT-4: Hello there! How are you?

Alpha - GPT-4 (All Tools) Confidential: Hi! How are you?