diff --git a/packages/playwright-core/src/server/trace/viewer/traceViewer.ts b/packages/playwright-core/src/server/trace/viewer/traceViewer.ts
index 3f322e7125..d3ab2f9b51 100644
--- a/packages/playwright-core/src/server/trace/viewer/traceViewer.ts
+++ b/packages/playwright-core/src/server/trace/viewer/traceViewer.ts
@@ -143,12 +143,12 @@ export async function installRootRedirect(server: HttpServer, traceUrls: string[
     response.statusCode = 302;
     response.setHeader('Location', urlPath);
 
-    if (process.env.OPENAI_API_KEY)
-      response.appendHeader('Set-Cookie', `openai_api_key=${process.env.OPENAI_API_KEY}`);
+    if (process.env.EXPERIMENTAL_OPENAI_API_KEY)
+      response.appendHeader('Set-Cookie', `openai_api_key=${process.env.EXPERIMENTAL_OPENAI_API_KEY}`);
     if (process.env.OPENAI_BASE_URL)
       response.appendHeader('Set-Cookie', `openai_base_url=${process.env.OPENAI_BASE_URL}`);
-    if (process.env.ANTHROPIC_API_KEY)
-      response.appendHeader('Set-Cookie', `anthropic_api_key=${process.env.ANTHROPIC_API_KEY}`);
+    if (process.env.EXPERIMENTAL_ANTHROPIC_API_KEY)
+      response.appendHeader('Set-Cookie', `anthropic_api_key=${process.env.EXPERIMENTAL_ANTHROPIC_API_KEY}`);
     if (process.env.ANTHROPIC_BASE_URL)
       response.appendHeader('Set-Cookie', `anthropic_base_url=${process.env.ANTHROPIC_BASE_URL}`);
 
diff --git a/tests/playwright-test/ui-mode-llm.spec.ts b/tests/playwright-test/ui-mode-llm.spec.ts
index 8c7b0447ec..9ae61f83c7 100644
--- a/tests/playwright-test/ui-mode-llm.spec.ts
+++ b/tests/playwright-test/ui-mode-llm.spec.ts
@@ -44,7 +44,7 @@ test('openai', async ({ runUITest, server }) => {
       });
     `,
   }, {
-    OPENAI_API_KEY: 'fake-key',
+    EXPERIMENTAL_OPENAI_API_KEY: 'fake-key',
     OPENAI_BASE_URL: server.PREFIX,
   });
 
@@ -84,7 +84,7 @@ test('anthropic', async ({ runUITest, server }) => {
       });
     `,
   }, {
-    ANTHROPIC_API_KEY: 'fake-key',
+    EXPERIMENTAL_ANTHROPIC_API_KEY: 'fake-key',
     ANTHROPIC_BASE_URL: server.PREFIX,
   });