OpenAI just shipped GPT-5.6 to everyone, and they did it with three different models instead of one. That is the interesting part.

Sol is the frontier model. It costs five times more than Luna per token, and it is built for the work that needs raw reasoning power over long horizons. Agentic tasks. Complex problem-solving. The kind of thing you cannot shortcut.

Terra is the everyday workhorse. It performs like GPT-5.5 but costs half as much. That matters because most teams do not actually need frontier reasoning for most of their work. Summarization, content drafting, analysis, routing. Terra handles that and leaves money in your budget.

Luna is the budget tier. One dollar per million input tokens. People building high-volume applications now have room to experiment with capabilities they could not afford a month ago.

The move is not about having better models. It is about giving teams the tool that matches the actual problem they are solving. You used to choose between maximum power and your budget. Now you can have both.

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Sources:
https://www.engadget.com/2210308/openai-rolls-out-gpt5-6-july-9/
https://www.neowin.net/news/openai-to-release-gpt-56-sol-terra-and-luna-on-july-9
https://openai.com/news/

Repost this. Thanks.