diff --git a/typescript/tests/model.test.mjs b/typescript/tests/model.test.mjs
index b3a75816..e4a510da 100644
--- a/typescript/tests/model.test.mjs
+++ b/typescript/tests/model.test.mjs
@@ -78,6 +78,7 @@ function makeErrorResponse(status, statusText, retryAfterSec = null) {
 
 let capturedRequests = [];
 let mockResponses = [];
+const nativeFetch = globalThis.fetch;
 
 function setupFetch(responses) {
     capturedRequests = [];
@@ -91,7 +92,7 @@ function setupFetch(responses) {
 }
 
 function teardownFetch() {
-    delete globalThis.fetch;
+    globalThis.fetch = nativeFetch;
     capturedRequests = [];
     mockResponses = [];
 }
@@ -343,6 +344,20 @@ describe("createOpenAILanguageModel (Responses API path)", () => {
 // createLanguageModel env-var routing
 // ---------------------------------------------------------------------------
 
+describe("createLanguageModel live API integration", () => {
+    test("calls the configured API when live tests are explicitly enabled", {
+        skip: process.env.TYPECHAT_LIVE_TESTS !== "1" || !process.env.OPENAI_API_KEY || !process.env.OPENAI_MODEL,
+    }, async () => {
+        const model = createLanguageModel(process.env);
+        model.timeoutMs = 30_000;
+        model.retryMaxAttempts = 0;
+        const result = await model.complete("Reply with the single word: pong");
+        assert.equal(result.success, true, result.message);
+        assert.equal(typeof result.data, "string");
+        assert.notEqual(result.data.trim(), "");
+    });
+});
+
 describe("createLanguageModel environment variable routing", () => {
     after(teardownFetch);