diff --git a/src/providers/google-vertex-ai/chatComplete.ts b/src/providers/google-vertex-ai/chatComplete.ts
index 2b412a497..6b69825c4 100644
--- a/src/providers/google-vertex-ai/chatComplete.ts
+++ b/src/providers/google-vertex-ai/chatComplete.ts
@@ -434,6 +434,7 @@ export const GoogleChatCompleteResponseTransform: (
       promptTokenCount = 0,
       candidatesTokenCount = 0,
       totalTokenCount = 0,
+      thoughtsTokenCount = 0,
     } = response.usageMetadata;
 
     return {
@@ -499,6 +500,9 @@ export const GoogleChatCompleteResponseTransform: (
         prompt_tokens: promptTokenCount,
         completion_tokens: candidatesTokenCount,
         total_tokens: totalTokenCount,
+        completion_tokens_details: {
+          reasoning_tokens: thoughtsTokenCount,
+        },
       },
     };
   }
@@ -589,6 +593,9 @@ export const GoogleChatCompleteStreamChunkTransform: (
       prompt_tokens: parsedChunk.usageMetadata.promptTokenCount,
       completion_tokens: parsedChunk.usageMetadata.candidatesTokenCount,
       total_tokens: parsedChunk.usageMetadata.totalTokenCount,
+      completion_tokens_details: {
+        reasoning_tokens: parsedChunk.usageMetadata.thoughtsTokenCount ?? 0,
+      },
     };
   }
 
diff --git a/src/providers/google-vertex-ai/transformGenerationConfig.ts b/src/providers/google-vertex-ai/transformGenerationConfig.ts
index 7d15142a1..0abf56abb 100644
--- a/src/providers/google-vertex-ai/transformGenerationConfig.ts
+++ b/src/providers/google-vertex-ai/transformGenerationConfig.ts
@@ -52,7 +52,8 @@ export function transformGenerationConfig(params: Params) {
 
   if (params?.thinking) {
     const thinkingConfig: Record<string, any> = {};
-    thinkingConfig['include_thoughts'] = true;
+    thinkingConfig['include_thoughts'] =
+      params.thinking.type && params.thinking.type === 'enabled' ? true : false;
     thinkingConfig['thinking_budget'] = params.thinking.budget_tokens;
     generationConfig['thinking_config'] = thinkingConfig;
   }
diff --git a/src/providers/google-vertex-ai/types.ts b/src/providers/google-vertex-ai/types.ts
index c0b6d6345..b8ec4fd43 100644
--- a/src/providers/google-vertex-ai/types.ts
+++ b/src/providers/google-vertex-ai/types.ts
@@ -65,6 +65,7 @@ export interface GoogleGenerateContentResponse {
     promptTokenCount: number;
     candidatesTokenCount: number;
     totalTokenCount: number;
+    thoughtsTokenCount?: number;
   };
 }
 
diff --git a/src/providers/google/chatComplete.ts b/src/providers/google/chatComplete.ts
index 1e2b67f8b..fad7f86d7 100644
--- a/src/providers/google/chatComplete.ts
+++ b/src/providers/google/chatComplete.ts
@@ -73,7 +73,8 @@ const transformGenerationConfig = (params: Params) => {
   }
   if (params?.thinking) {
     const thinkingConfig: Record<string, any> = {};
-    thinkingConfig['include_thoughts'] = true;
+    thinkingConfig['include_thoughts'] =
+      params.thinking.type && params.thinking.type === 'enabled' ? true : false;
     thinkingConfig['thinking_budget'] = params.thinking.budget_tokens;
     generationConfig['thinking_config'] = thinkingConfig;
   }
@@ -479,6 +480,7 @@ interface GoogleGenerateContentResponse {
     promptTokenCount: number;
     candidatesTokenCount: number;
     totalTokenCount: number;
+    thoughtsTokenCount: number;
   };
 }
 
@@ -579,6 +581,9 @@ export const GoogleChatCompleteResponseTransform: (
         prompt_tokens: response.usageMetadata.promptTokenCount,
         completion_tokens: response.usageMetadata.candidatesTokenCount,
         total_tokens: response.usageMetadata.totalTokenCount,
+        completion_tokens_details: {
+          reasoning_tokens: response.usageMetadata.thoughtsTokenCount ?? 0,
+        },
       },
     };
   }
@@ -624,6 +629,9 @@ export const GoogleChatCompleteStreamChunkTransform: (
       prompt_tokens: parsedChunk.usageMetadata.promptTokenCount,
       completion_tokens: parsedChunk.usageMetadata.candidatesTokenCount,
       total_tokens: parsedChunk.usageMetadata.totalTokenCount,
+      completion_tokens_details: {
+        reasoning_tokens: parsedChunk.usageMetadata.thoughtsTokenCount ?? 0,
+      },
     };
   }