diff --git a/packages/ai/src/providers/openai-responses.ts b/packages/ai/src/providers/openai-responses.ts
index e494f325..fc0e1dcf 100644
--- a/packages/ai/src/providers/openai-responses.ts
+++ b/packages/ai/src/providers/openai-responses.ts
@@ -10,6 +10,7 @@ import type {
 	ResponseOutputMessage,
 	ResponseReasoningItem,
 } from "openai/resources/responses/responses.js";
+import { calculateCost } from "../models.js";
 import type {
 	AssistantMessage,
 	Context,
@@ -236,6 +237,8 @@ export class OpenAIResponsesLLM implements LLM<OpenAIResponsesLLMOptions> {
 				stopReason = "toolUse";
 			}
 
+			calculateCost(this.modelInfo, usage);
+
 			const output = {
 				role: "assistant",
 				content: blocks,