[adampeterhiggins]

Summary

Switching models inside an existing thread left no marker, unlike forking the chat onto another provider, which leaves a divider in the new thread. The transcript now shows the model the conversation was on and the model the next message uses.

The divider appears as soon as the composer selection differs, and it stays in the history above the message that uses the new model. A provider switch that already shows a context handoff keeps that handoff. Changing only effort or another option on the same model does not add a divider.

Test plan

• In a started thread, change the model in the composer and confirm a "Model changed" divider appears before sending
• Send the next message and confirm the divider stays above that message after reload
• Change the model back before sending and confirm the divider disappears
• Change only effort on the same model and confirm no divider
• Switch providers in a way that already shows a context handoff and confirm there is not a second divider
• Repeat the model change on mobile

Grok 4.7 in Cursor via T3 Code.

Made with Cursor