diff --git a/src/shared/key-management/google-ai/checker.ts b/src/shared/key-management/google-ai/checker.ts
index 9f7b609..3f442cf 100644
--- a/src/shared/key-management/google-ai/checker.ts
+++ b/src/shared/key-management/google-ai/checker.ts
@@ -12,6 +12,9 @@ const LIST_MODELS_URL =
   "https://generativelanguage.googleapis.com/v1beta/models";
 const GENERATE_CONTENT_URL =
   "https://generativelanguage.googleapis.com/v1beta/models/gemini-2.0-flash:generateContent?key=%KEY%";
+const PRO_MODEL_ID = "gemini-2.5-pro-preview-05-06";
+const GENERATE_PRO_CONTENT_URL =
+  `https://generativelanguage.googleapis.com/v1beta/models/${PRO_MODEL_ID}:generateContent?key=%KEY%`;
 
 type ListModelsResponse = {
   models: {
@@ -46,12 +49,27 @@ export class GoogleAIKeyChecker extends KeyCheckerBase<GoogleAIKey> {
 
   protected async testKeyOrFail(key: GoogleAIKey) {
     const provisionedModels = await this.getProvisionedModels(key);
+
+    // Always test flash model access (existing behaviour)
     await this.testGenerateContent(key);
 
-    const updates = { modelFamilies: provisionedModels };
+    // If key claims to support gemini-pro, perform a second layer test with a pro model.
+    let effectiveFamilies = [...provisionedModels];
+    if (effectiveFamilies.includes("gemini-pro")) {
+      const proAccessible = await this.canAccessModel(
+        key,
+        GENERATE_PRO_CONTENT_URL
+      );
+      if (!proAccessible) {
+        // Remove pro access if invocation fails
+        effectiveFamilies = effectiveFamilies.filter((f) => f !== "gemini-pro");
+      }
+    }
+
+    const updates = { modelFamilies: effectiveFamilies };
     this.updateKey(key.hash, updates);
     this.log.info(
-      { key: key.hash, models: key.modelFamilies, ids: key.modelIds.length },
+      { key: key.hash, models: effectiveFamilies, ids: key.modelIds?.length },
       "Checked key."
     );
   }
@@ -94,6 +112,28 @@ export class GoogleAIKeyChecker extends KeyCheckerBase<GoogleAIKey> {
     );
   }
 
+  private async canAccessModel(
+    key: GoogleAIKey,
+    modelGenerateUrlTemplate: string
+  ): Promise<boolean> {
+    const payload = {
+      contents: [{ parts: { text: "hi" }, role: "user" }],
+      tools: [],
+      safetySettings: [],
+      generationConfig: { maxOutputTokens: 1 },
+    };
+    try {
+      await axios.post(
+        modelGenerateUrlTemplate.replace("%KEY%", key.key),
+        payload,
+        { validateStatus: (status) => status === 200 }
+      );
+      return true;
+    } catch {
+      return false;
+    }
+  }
+
   protected handleAxiosError(key: GoogleAIKey, error: AxiosError): void {
     if (error.response && GoogleAIKeyChecker.errorIsGoogleAIError(error)) {
       const httpStatus = error.response.status;
@@ -103,12 +143,12 @@ export class GoogleAIKeyChecker extends KeyCheckerBase<GoogleAIKey> {
         case 400: {
           const keyDeadMsgs = [
             /please enable billing/i,
-            /API key not valid/i,
-            /API key expired/i,
-            /pass a valid API/i,
+            /api key not valid/i,
+            /api key expired/i,
+            /pass a valid api/i,
           ];
           const text = JSON.stringify(error.response.data.error);
-          if (text.match(keyDeadMsgs.join("|"))) {
+          if (keyDeadMsgs.some((r) => r.test(text))) {
             this.log.warn(
               { key: key.hash, error: text },
               "Key check returned a non-transient 400 error. Disabling key."
@@ -133,7 +173,7 @@ export class GoogleAIKeyChecker extends KeyCheckerBase<GoogleAIKey> {
             /GenerateContentRequestsPerMinutePerProjectPerRegion/i,
             /"quota_limit_value":"0"/i,
           ];
-          if (keyDeadMsgs.some(r => r.test(text))) {
+          if (keyDeadMsgs.some((r) => r.test(text))) {
             this.log.warn(
               { key: key.hash, error: text },
               "Key check returned a non-transient 429 error. Disabling key."