Fix model picker clearing reasoning effort and fast mode options

cursoragent · cursoragent · commit 569dd7bcabb4 · 2026-03-24T18:20:28.000Z
Preserve existing modelSelection.options when the user switches models
within the same provider. Previously, onProviderModelSelect constructed
a new ModelSelection with only provider and model, silently dropping
any configured reasoning effort or fast mode settings.
diff --git a/apps/web/src/components/ChatView.tsx b/apps/web/src/components/ChatView.tsx
@@ -3135,10 +3135,14 @@ export default function ChatView({ threadId }: ChatViewProps) {
         return;
       }
       const resolvedModel = resolveAppModelSelection(provider, customModelsByProvider, model);
+      const existingOptions = composerDraft.modelSelection?.options;
+      const preserveOptions =
+        existingOptions !== undefined && composerDraft.modelSelection?.provider === provider;
       const nextModelSelection: ModelSelection = {
         provider,
         model: resolvedModel,
-      };
+        ...(preserveOptions ? { options: existingOptions } : {}),
+      } as ModelSelection;
       setComposerDraftModelSelection(activeThread.id, nextModelSelection);
       setStickyComposerModelSelection(nextModelSelection);
       scheduleComposerFocus();
@@ -3150,6 +3154,7 @@ export default function ChatView({ threadId }: ChatViewProps) {
       setComposerDraftModelSelection,
       setStickyComposerModelSelection,
       customModelsByProvider,
+      composerDraft.modelSelection,
     ],
   );
   const setPromptFromTraits = useCallback(
