diff --git a/src/features/providers/sheets/forms/BaseProviderForm.tsx b/src/features/providers/sheets/forms/BaseProviderForm.tsx
index b025e70..03dd197 100644
--- a/src/features/providers/sheets/forms/BaseProviderForm.tsx
+++ b/src/features/providers/sheets/forms/BaseProviderForm.tsx
@@ -123,6 +123,7 @@ function buildInitialForm(
             apiKey: entry.apiKey,
             proxyUrl: entry.proxyUrl ?? '',
             headersText: headersObjectToText(entry.headers),
+            authIndex: entry.authIndex,
           }))
         : [emptyApiKeyEntry()],
     };
diff --git a/src/features/providers/sheets/forms/useConnectivityTest.ts b/src/features/providers/sheets/forms/useConnectivityTest.ts
index b09a150..291044e 100644
--- a/src/features/providers/sheets/forms/useConnectivityTest.ts
+++ b/src/features/providers/sheets/forms/useConnectivityTest.ts
@@ -126,7 +126,12 @@ export function useConnectivityTest(
     () =>
       (apiKeyEntries ?? []).map(
         (entry) =>
-          `${entry.apiKey ?? ''}||${entry.proxyUrl ?? ''}||${entry.headersText ?? ''}`
+          [
+            entry.apiKey ?? '',
+            entry.authIndex ?? '',
+            entry.proxyUrl ?? '',
+            entry.headersText ?? '',
+          ].join('||')
       ),
     [apiKeyEntries]
   );
@@ -199,7 +204,8 @@ export function useConnectivityTest(
       }
       const entry = apiKeyEntries?.[idx];
       const entryKey = (entry?.apiKey ?? '').trim();
-      const resolvedAuthIndex = (authIndex ?? '').trim() || undefined;
+      const resolvedAuthIndex =
+        (entry?.authIndex ?? '').trim() || (authIndex ?? '').trim() || undefined;
       if (!entryKey && !resolvedAuthIndex) {
         updateOpenaiStatus(idx, {
           state: 'error',
diff --git a/src/features/providers/sheets/forms/useModelDiscovery.ts b/src/features/providers/sheets/forms/useModelDiscovery.ts
index 4d9d98d..e752065 100644
--- a/src/features/providers/sheets/forms/useModelDiscovery.ts
+++ b/src/features/providers/sheets/forms/useModelDiscovery.ts
@@ -110,9 +110,11 @@ export function useModelDiscovery(
         );
       } else if (brand === 'openaiCompatibility') {
         const firstEntry = (apiKeyEntries ?? []).find((e) =>
-          (e.apiKey ?? '').trim()
+          (e.apiKey ?? '').trim() || (e.authIndex ?? '').trim()
         );
         const entryKey = (firstEntry?.apiKey ?? '').trim();
+        const entryAuthIndex =
+          (firstEntry?.authIndex ?? '').trim() || resolvedAuthIndex;
         const entryHeaders = parseHeadersText(firstEntry?.headersText ?? '');
         const headers = { ...baseHeaders, ...entryHeaders };
         try {
@@ -120,7 +122,7 @@ export function useModelDiscovery(
             baseUrl,
             entryKey,
             headers,
-            resolvedAuthIndex
+            entryAuthIndex
           );
         } catch (firstErr) {
           // Some OpenAI-compatible endpoints expose /models without auth, or
@@ -165,9 +167,16 @@ export function useModelDiscovery(
       .map((h) => `${h.key}:${h.value}`)
       .join('|');
     const entriesSig = (apiKeyEntries ?? [])
-      .map((e) => `${e.apiKey ?? ''}::${e.headersText ?? ''}`)
+      .map((e) => `${e.apiKey ?? ''}::${e.authIndex ?? ''}::${e.headersText ?? ''}`)
       .join('|');
-    return `${baseUrl}||${apiKey ?? ''}||${fallbackApiKey ?? ''}||${authIndex ?? ''}||${headerSig}||${entriesSig}`;
+    return [
+      baseUrl,
+      apiKey ?? '',
+      fallbackApiKey ?? '',
+      authIndex ?? '',
+      headerSig,
+      entriesSig,
+    ].join('||');
   }, [apiKey, apiKeyEntries, authIndex, baseUrl, fallbackApiKey, formHeaders]);
 
   const lastSignatureRef = useRef(inputSignature);
diff --git a/src/features/providers/types.ts b/src/features/providers/types.ts
index 69b1ac4..44f3d75 100644
--- a/src/features/providers/types.ts
+++ b/src/features/providers/types.ts
@@ -78,7 +78,8 @@ export interface ProviderSnapshot {
 }
 
 /**
- * 通用 Sheet 表单值(Gemini/Codex/Claude/Vertex/OpenAI 共用基础字段,各自启用 advanced 区)
+ * 通用 Sheet 表单值。
+ * Gemini/Codex/Claude/Vertex/OpenAI 共用基础字段,各自启用 advanced 区。
  */
 export interface ModelEntryInput {
   name: string;
@@ -91,6 +92,7 @@ export interface ApiKeyEntryInput {
   apiKey: string;
   proxyUrl: string;
   headersText: string;
+  authIndex?: string;
 }
 
 export interface CloakInput {
diff --git a/src/features/providers/useProviderWorkbench.ts b/src/features/providers/useProviderWorkbench.ts
index a0b8336..8863ab8 100644
--- a/src/features/providers/useProviderWorkbench.ts
+++ b/src/features/providers/useProviderWorkbench.ts
@@ -180,6 +180,7 @@ const buildOpenAIConfig = (
         headers: Object.keys(parseHeadersText(entry.headersText)).length
           ? parseHeadersText(entry.headersText)
           : undefined,
+        authIndex: entry.authIndex?.trim() || undefined,
       }))
       .filter((entry) => entry.apiKey) ?? [];