ChatGPT
OpenAI's conversational AI product, launched November 2022; first LLM to reach mainstream adoption.
Think of it like
The moment LLMs became real to the world; a chatbot that felt genuinely smart.
Example
Launched publicly free (limited GPT-3.5-turbo), reached 1 million users in a week, 100 million in two months.
How it actually works
ChatGPT is GPT-3.5 or GPT-4 fine-tuned on conversation data with RLHF. The chat interface (with history) makes it feel more personal than an API. Plus subscription ($20/mo) includes GPT-4 and plugins.
For product teams
The product that validated LLM demand; set expectations for performance and price.
For engineers
RLHF applied to conversation is powerful; users prefer ChatGPT's tone over raw GPT.
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