Change the model

Click the model name in the chat box (for example Claude Opus 5.5). A window opens.

• The ones you used last are at the top.
• Type to search every model you have, including your own models and model groups.
• Click one, or use the arrow keys and press Enter.

Switching starts a fresh chat on the new model, in the same project. The old chat is kept in Recents. If it was still answering, it carries on in the background.

Only for one message

Want a second opinion without leaving the chat? Type @ in the chat box and pick a model. Only that message goes to it. See The chat box.

Changing the one a new chat starts with

Go to Model settings and choose it under Default model. See Model settings.

How hard it thinks

Press the brain button next to the model name. A small window opens, How hard it thinks, with a slider and one button for each level, such as Low, Medium, High and Max (some models have fewer, and some have none, in which case there is no brain button). Higher means a slower, more careful answer. Like changing the model, changing this starts a fresh chat.