diff --git a/src/shared/tokenization/tokenizer.ts b/src/shared/tokenization/tokenizer.ts
index d831102..b3b2457 100644
--- a/src/shared/tokenization/tokenizer.ts
+++ b/src/shared/tokenization/tokenizer.ts
@@ -31,7 +31,7 @@ export async function init() {
 type OpenAIChatTokenCountRequest = {
   prompt: OpenAIChatMessage[];
   completion?: never;
-  service: "openai";
+  service: "openai" | "openai-responses";
 };
 
 type AnthropicChatTokenCountRequest = {