Models

Summer gives you three ways to choose which model does the work:

• Auto — Summer picks for you. The default for new chats, available on every plan.
• MAX — Summer picks from the frontier models, billed at the API pricing of whatever it selects. Paid plans only.
• A specific model — you pick one yourself from the model selector.

​

The selector is the list

The model selector in the chat composer is the source of truth for what you can pick right now. It is rendered from the live model catalog, so it is current in a way a documentation page cannot be. Open it and you will see every model, grouped by provider, with its context window and any cost warning attached. Models are added and retired regularly. Anything named on this page is a snapshot of a moving list; the selector is not.

​

What each plan can pick

Auto is not the only thing a free account can use. The two concrete models are selectable on purpose, for people who would rather name their model than hand the choice to Auto’s routing. Models your plan does not cover still appear in the selector, muted and marked with a lock. Picking one opens the upgrade prompt rather than switching your chat.

​

Which providers are in the selector

On a paid plan you can pick directly from every provider represented in the selector: Individual model names and versions live in the selector — hover one to see its description, context window, and any cost warning. Some frontier models will burn a $20 plan quickly; those carry a “Higher cost” marker and an estimate of how many messages your balance has left at that model’s rate.