diff --git a/.changeset/busy-trains-ring.md b/.changeset/busy-trains-ring.md
new file mode 100644
index 00000000..c4b1f8d7
--- /dev/null
+++ b/.changeset/busy-trains-ring.md
@@ -0,0 +1,5 @@
+---
+'@openai/agents-realtime': patch
+---
+
+Resolved typo with usage events
diff --git a/packages/agents-realtime/src/openaiRealtimeBase.ts b/packages/agents-realtime/src/openaiRealtimeBase.ts
index f4c15b89..86014411 100644
--- a/packages/agents-realtime/src/openaiRealtimeBase.ts
+++ b/packages/agents-realtime/src/openaiRealtimeBase.ts
@@ -215,10 +215,10 @@ export abstract class OpenAIRealtimeBase
       const usage = new Usage({
         inputTokens,
         inputTokensDetails:
-          response.data.response.usage?.input_tokens_details ?? {},
+          response.data.response.usage?.input_token_details ?? {},
         outputTokens,
         outputTokensDetails:
-          response.data.response.usage?.output_tokens_details ?? {},
+          response.data.response.usage?.output_token_details ?? {},
         totalTokens,
       });
       this.emit('usage_update', usage);
@@ -230,10 +230,10 @@ export abstract class OpenAIRealtimeBase
           usage: {
             inputTokens,
             inputTokensDetails:
-              response.data.response.usage?.input_tokens_details ?? {},
+              response.data.response.usage?.input_token_details ?? {},
             outputTokens,
             outputTokensDetails:
-              response.data.response.usage?.output_tokens_details ?? {},
+              response.data.response.usage?.output_token_details ?? {},
             totalTokens,
           },
         },
@@ -665,7 +665,7 @@ export abstract class OpenAIRealtimeBase
     }
 
     if (
-      this.#tracingConfig !== null && 
+      this.#tracingConfig !== null &&
       typeof this.#tracingConfig !== 'string' &&
       typeof tracingConfig !== 'string'
     ) {
diff --git a/packages/agents-realtime/src/openaiRealtimeEvents.ts b/packages/agents-realtime/src/openaiRealtimeEvents.ts
index e3154203..0228eb31 100644
--- a/packages/agents-realtime/src/openaiRealtimeEvents.ts
+++ b/packages/agents-realtime/src/openaiRealtimeEvents.ts
@@ -35,12 +35,9 @@ export const realtimeResponse = z.object({
   usage: z
     .object({
       input_tokens: z.number().optional(),
-      input_tokens_details: z.record(z.string(), z.any()).optional().nullable(),
+      input_token_details: z.record(z.string(), z.any()).optional().nullable(),
       output_tokens: z.number().optional(),
-      output_tokens_details: z
-        .record(z.string(), z.any())
-        .optional()
-        .nullable(),
+      output_token_details: z.record(z.string(), z.any()).optional().nullable(),
     })
     .optional()
     .nullable(),