Thanks for reporting. Can you share a bit more information, please, including going to About Cursor and copying the information there? Please try updating and restarting Cursor as a first step.
One more step that might help: can you go to Help → Toggle Developer Tools → Console and see if there is a clear error when you press Submit?
I have this error in the console when I click (while opus 4.6 is selected)
ERR CloudAgentRepository: createAgent requires selected model: Error: CloudAgentRepository: createAgent requires selected model
at R6d.createAgent (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:59736:18178)
at FgS.createAgent (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:60747:52098)
at vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:58046:136033
at J20.withDelegate (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:58046:135669)
at J20.createAgent (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:58046:136015)
at vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:59731:23405
at vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:59725:2478
at p (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:55362:43140)
at Jcp.test.t. (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:748:14984)
at z3o (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:44311:139736)
at vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:44311:145255
at gg (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:44311:16009)
at m9 (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:44311:141120)
at pNn (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:44312:31127)
at vkc (vscode-file://vscode-app/Applications/Cursor.app/Contents/Resources/app/out/vs/workbench/workbench.desktop.main.js:44312:30914) Error: CloudAgentRepository: createAgent requires selected model
at R6d.createAgent (workbench.desktop.main.js:59736:18178)
at FgS.createAgent (workbench.desktop.main.js:60747:52098)
at workbench.desktop.main.js:58046:136033
at J20.withDelegate (workbench.desktop.main.js:58046:135669)
at J20.createAgent (workbench.desktop.main.js:58046:136015)
at workbench.desktop.main.js:59731:23405
at workbench.desktop.main.js:59725:2478
at p (workbench.desktop.main.js:55362:43140)
at Jcp.test.t. (workbench.desktop.main.js:748:14984)
at z3o (workbench.desktop.main.js:44311:139736)
at workbench.desktop.main.js:44311:145255
at gg (workbench.desktop.main.js:44311:16009)
at m9 (workbench.desktop.main.js:44311:141120)
at pNn (workbench.desktop.main.js:44312:31127)
at vkc (workbench.desktop.main.js:44312:30914)
error @ workbench.desktop.main.js:65
error @ workbench.desktop.main.js:65
error @ workbench.desktop.main.js:58046
handleUnexpectedError @ workbench.desktop.main.js:58043
(anonymous) @ workbench.desktop.main.js:58043
onUnexpectedError @ workbench.desktop.main.js:33
Sc @ workbench.desktop.main.js:28
(anonymous) @ workbench.desktop.main.js:58043
Thank you very much for the additional detail. This helps narrow it down. It is a known bug, and a fix has been identified, but it has not yet been released. Will keep you updated!
In the meantime, I think I may have a workaround for you. Can you try toggling through the model picker? E.g., Switch to a different model, select it, and then switch back to your desired model. I believe this will circumvent the ui state bug.