The AI family tree
Think of it like this: OpenAI is the company, ChatGPT is the product line of AIs, and GPT-5.6 Luna is a specific model. The same way Apple is the company, the iPhone is the product line, and the iPhone 16 Pro Max is a specific model.
The company
makes many things
The product line
a whole family of AIs
A specific model
the exact one you pick
OpenAI
ChatGPT
the AI product line
GPT-5
GPT-5.6 Luna
Anthropic
Claude
the AI product line
Claude Sonnet 4.5
Claude Fable 5
Google
Gemini
the AI product line
Gemini 3 Flash
Gemini 3 Pro
For comparison
Apple
iPhone
the AI product line
iPhone 16
iPhone 16 Pro Max
The takeaway:“GPT-5.6 Luna” is to ChatGPT what the “iPhone 16 Pro Max” is to the iPhone — one specific model inside a much bigger family made by one company.
Model names shown are illustrative examples of each product line.