diff --git a/packages/core/src/core/openaiContentGenerator.ts b/packages/core/src/core/openaiContentGenerator.ts
index 2def0fa5..9d1e1229 100644
--- a/packages/core/src/core/openaiContentGenerator.ts
+++ b/packages/core/src/core/openaiContentGenerator.ts
@@ -300,6 +300,7 @@ export class OpenAIContentGenerator implements ContentGenerator {
         messages,
         ...samplingParams,
         stream: true,
+        stream_options: { include_usage: true },
       };
 
       if (request.config?.tools) {