From f89f92f45a40053ed72e558caa3073957fc5764a Mon Sep 17 00:00:00 2001
From: Dingding-leo <193228693+Dingding-leo@users.noreply.github.com>
Date: Mon, 27 Jul 2026 03:07:54 +0930
Subject: [PATCH] fix(open-sse): add 'has been exhausted' to
 CREDITS_EXHAUSTED_SIGNALS (fixes #8631)

Adds 'has been exhausted' string to CREDITS_EXHAUSTED_SIGNALS array so free-tier depletion errors like 'The free tier of the model has been exhausted.' are classified as QUOTA_EXHAUSTED rather than falling through to generic error handling.
---
 open-sse/services/accountFallback.ts |  1 +
 tests/unit/error-classifier.test.ts  | 11 ++++++-----
 2 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/open-sse/services/accountFallback.ts b/open-sse/services/accountFallback.ts
index 0f43303e81..97ff711685 100644
--- a/open-sse/services/accountFallback.ts
+++ b/open-sse/services/accountFallback.ts
@@ -183,6 +183,7 @@ export const CREDITS_EXHAUSTED_SIGNALS = [
   "out of credits",
   "payment required",
   "free tier of the model has been exhausted",
+  "has been exhausted",
   // #5239: providers (e.g. DeepSeek/GLM-style) return "Insufficient account balance"
   // on a depleted key. 402 is already terminalized by status, but catch non-402
   // out-of-credit bodies here too.
diff --git a/tests/unit/error-classifier.test.ts b/tests/unit/error-classifier.test.ts
index ef9b740955..fac4760cbd 100644
--- a/tests/unit/error-classifier.test.ts
+++ b/tests/unit/error-classifier.test.ts
@@ -27,6 +27,11 @@ test("classifyProviderError: 400 + billing signal => QUOTA_EXHAUSTED", () => {
     error: { message: "insufficient_quota: exceeded your current quota" },
   });
   assert.equal(result, PROVIDER_ERROR_TYPES.QUOTA_EXHAUSTED);
+
+  const resultExhausted = classifyProviderError(400, {
+    error: { message: "The free tier of the model has been exhausted." },
+  });
+  assert.equal(resultExhausted, PROVIDER_ERROR_TYPES.QUOTA_EXHAUSTED);
 });
 
 test("classifyProviderError: 429 without billing signal => RATE_LIMITED", () => {
@@ -132,10 +137,6 @@ test("classifyProviderError: 404 => MODEL_NOT_FOUND", () => {
 });
 
 test("classifyProviderError: 404 with provider => MODEL_NOT_FOUND", () => {
-  const result = classifyProviderError(
-    404,
-    { error: { message: "Not Found" } },
-    "v0-vercel"
-  );
+  const result = classifyProviderError(404, { error: { message: "Not Found" } }, "v0-vercel");
   assert.equal(result, PROVIDER_ERROR_TYPES.MODEL_NOT_FOUND);
 });