diff --git a/packages/console/app/src/routes/zen/util/handler.ts b/packages/console/app/src/routes/zen/util/handler.ts
index ee223498ca..4ef8b7a208 100644
--- a/packages/console/app/src/routes/zen/util/handler.ts
+++ b/packages/console/app/src/routes/zen/util/handler.ts
@@ -252,6 +252,8 @@ export async function handler(
           })
           if (isNewInference) {
             headers.set("x-zen-model", model)
+            if (opts.modelList === "lite")
+              headers.set("x-zen-billing-source", billingSource === "lite" ? "go" : "credit")
           }
           headers.delete("host")
           headers.delete("content-length")
@@ -261,6 +263,7 @@ export async function handler(
             headers.delete("x-opencode-client")
             headers.delete("x-opencode-request")
             headers.delete("x-zen-model")
+            headers.delete("x-zen-billing-source")
           }
           return headers
         })(),