diff --git a/packages/api/src/endpoints/google/llm.spec.ts b/packages/api/src/endpoints/google/llm.spec.ts
index a078842543..0a65ab7a80 100644
--- a/packages/api/src/endpoints/google/llm.spec.ts
+++ b/packages/api/src/endpoints/google/llm.spec.ts
@@ -949,6 +949,43 @@ describe('getGoogleConfig', () => {
       expect(config).toMatchObject({ includeThoughts: true });
     });
 
+    it('should use thinkingLevel for Gemma 4 models', () => {
+      const credentials = {
+        [AuthKeys.GOOGLE_API_KEY]: 'test-api-key',
+      };
+
+      const result = getGoogleConfig(credentials, {
+        modelOptions: {
+          model: 'gemma-4-31b-it',
+          thinking: true,
+          thinkingLevel: ThinkingLevel.high,
+        },
+      });
+
+      expect((result.llmConfig as Record<string, unknown>).thinkingConfig).toMatchObject({
+        includeThoughts: true,
+        thinkingLevel: 'HIGH',
+      });
+    });
+
+    it('should ignore thinkingBudget for Gemma 4 models', () => {
+      const credentials = {
+        [AuthKeys.GOOGLE_API_KEY]: 'test-api-key',
+      };
+
+      const result = getGoogleConfig(credentials, {
+        modelOptions: {
+          model: 'gemma-4-31b-it',
+          thinking: true,
+          thinkingBudget: 5000,
+        },
+      });
+
+      const config = (result.llmConfig as Record<string, unknown>).thinkingConfig;
+      expect(config).not.toHaveProperty('thinkingBudget');
+      expect(config).toMatchObject({ includeThoughts: true });
+    });
+
     it('should NOT classify gemini-2.9-flash as Gemini 3+', () => {
       const credentials = {
         [AuthKeys.GOOGLE_API_KEY]: 'test-api-key',
diff --git a/packages/api/src/endpoints/google/llm.ts b/packages/api/src/endpoints/google/llm.ts
index 880f3ef5d6..98802dcd15 100644
--- a/packages/api/src/endpoints/google/llm.ts
+++ b/packages/api/src/endpoints/google/llm.ts
@@ -398,18 +398,18 @@ export function getGoogleConfig(
   const modelName = (modelOptions?.model ?? '') as string;
 
   /**
-   * Gemini 3+ uses a qualitative `thinkingLevel` ('minimal'|'low'|'medium'|'high')
-   * instead of the numeric `thinkingBudget` used by Gemini 2.5 and earlier.
+   * Gemini 3+ and Gemma 4+ use a qualitative `thinkingLevel` ('minimal'|'low'|'medium'|'high')
+   * instead of the numeric `thinkingBudget` used by earlier models.
    * When `thinking` is enabled (default: true), we always send `thinkingConfig`
-   * with `includeThoughts: true`. The `thinkingBudget` param is ignored for Gemini 3+.
+   * with `includeThoughts: true`. The `thinkingBudget` param is ignored for these models.
    *
    * For Vertex AI, top-level `includeThoughts` is still required because
    * `@librechat/agents/langchain/google-common`'s `formatGenerationConfig` reads it separately
    * from `thinkingConfig` — they serve different purposes in the request pipeline.
    */
-  const isGemini3Plus = /gemini-([3-9]|\d{2,})/i.test(modelName);
+  const supportsThinkingLevel = /gemini-([3-9]|\d{2,})|gemma-([4-9]|\d{2,})/i.test(modelName);
 
-  if (isGemini3Plus && thinking) {
+  if (supportsThinkingLevel && thinking) {
     const thinkingConfig: GoogleThinkingConfig = {
       includeThoughts: true,
     };
@@ -423,7 +423,7 @@ export function getGoogleConfig(
       (llmConfig as { thinkingConfig?: GoogleThinkingConfig }).thinkingConfig = thinkingConfig;
       (llmConfig as VertexAIClientOptions).includeThoughts = true;
     }
-  } else if (!isGemini3Plus) {
+  } else if (!supportsThinkingLevel) {
     const shouldEnableThinking =
       thinking && thinkingBudget != null && (thinkingBudget > 0 || thinkingBudget === -1);