diff --git a/lib/hooks/use-scene-generator.ts b/lib/hooks/use-scene-generator.ts
index ee6ad2c04..432fc8e24 100644
--- a/lib/hooks/use-scene-generator.ts
+++ b/lib/hooks/use-scene-generator.ts
@@ -403,6 +403,25 @@ export function useSceneGenerator(options: UseSceneGeneratorOptions = {}) {
         if (!abortRef.current && !pausedByFailureOrAbort) {
           store.getState().setGenerationStatus('completed');
           store.getState().setGeneratingOutlines([]);
+
+          // Persist course to server disk so the classroom opens in other browsers
+          try {
+            const finalState = store.getState();
+            const finalStage = finalState.stage;
+            const finalScenes = finalState.scenes;
+            if (finalStage && finalScenes.length > 0) {
+              await fetch('/api/classroom', {
+                method: 'POST',
+                headers: { 'Content-Type': 'application/json' },
+                body: JSON.stringify({ stage: finalStage, scenes: finalScenes }),
+              });
+              log.info('Classroom persisted to server disk:', finalStage.id);
+            }
+          } catch (persistErr) {
+            // Non-fatal — generation is complete, disk write failure should not block the user
+            log.warn('Failed to persist classroom to server disk:', persistErr);
+          }
+
           options.onComplete?.();
         }
       } catch (err: unknown) {