diff --git a/src/providers/OpenRouterProvider.js b/src/providers/OpenRouterProvider.js
index fca13c4..9c6383d 100644
--- a/src/providers/OpenRouterProvider.js
+++ b/src/providers/OpenRouterProvider.js
@@ -50,6 +50,7 @@ class OpenRouterProvider {
             reasoning: {
                 effort: 'medium'
             },
+            cache_control: { type: "ephemeral" },
             include: ["reasoning.encrypted_content"],
             stream: true,
             ...(effectiveSessionId ? { session_id: effectiveSessionId } : {}),