diff --git a/codex-rs/codex-api/src/endpoint/models.rs b/codex-rs/codex-api/src/endpoint/models.rs
index 5de08432f0..1d7637b2e7 100644
--- a/codex-rs/codex-api/src/endpoint/models.rs
+++ b/codex-rs/codex-api/src/endpoint/models.rs
@@ -48,8 +48,11 @@ impl<T: HttpTransport, A: AuthProvider> ModelsClient<T, A> {
 
             let separator = if req.url.contains('?') { '&' } else { '?' };
             req.url = format!("{}{}client_version={client_version}", req.url, separator);
-
-            add_auth_headers(&self.auth, req)
+            if self.auth.account_id().is_some() {
+                add_auth_headers(&self.auth, req)
+            } else {
+                req
+            }
         };
 
         let resp = run_with_request_telemetry(