diff --git a/litellm/proxy/client/cli/commands/auto_sign_in.py b/litellm/proxy/client/cli/commands/auto_sign_in.py
index aca26989057..ea769a4a717 100644
--- a/litellm/proxy/client/cli/commands/auto_sign_in.py
+++ b/litellm/proxy/client/cli/commands/auto_sign_in.py
@@ -28,8 +28,11 @@ def _runs_in_ci(environ: Mapping[str, str]) -> bool:
     return environ.get("CI", "").strip().lower() not in {"", "0", "false"}
 
 
-def _open_browser_off_stdout(url: str) -> bool:
-    return subprocess.run((sys.executable, "-I", "-m", "webbrowser", url), stdout=2, check=False).returncode == 0
+_OPEN_URL_IN_BROWSER: Final = "import sys, webbrowser; webbrowser.open(sys.argv[1])"
+
+
+def open_browser_off_stdout(url: str) -> None:
+    subprocess.run((sys.executable, "-I", "-c", _OPEN_URL_IN_BROWSER, url), stdout=2, check=False)
 
 
 def pkce_browser_sign_in(
@@ -37,7 +40,7 @@ def pkce_browser_sign_in(
     echo: Callable[[str], None],
     find_browser: Callable[[], webbrowser.BaseBrowser] = webbrowser.get,
     environ: Mapping[str, str] = os.environ,
-    open_browser: Callable[[str], object] = _open_browser_off_stdout,
+    open_browser: Callable[[str], object] = open_browser_off_stdout,
 ) -> PkceCredential | PkceFailure:
     if _runs_in_ci(environ):
         return PkceFailure("the CI environment variable is set, so lite does not open a browser")
diff --git a/tests/unit/proxy/client/cli/test_auto_sign_in.py b/tests/unit/proxy/client/cli/test_auto_sign_in.py
index 36bb5a31d3b..949a0321f75 100644
--- a/tests/unit/proxy/client/cli/test_auto_sign_in.py
+++ b/tests/unit/proxy/client/cli/test_auto_sign_in.py
@@ -10,7 +10,7 @@ from click.testing import CliRunner, Result
 
 from litellm.proxy.client.cli import cli
 from litellm.proxy.client.cli.commands.auth import CliTokenData, get_stored_api_key, save_token
-from litellm.proxy.client.cli.commands.auto_sign_in import pkce_browser_sign_in
+from litellm.proxy.client.cli.commands.auto_sign_in import open_browser_off_stdout, pkce_browser_sign_in
 from litellm.proxy.client.cli.commands.pkce_login import PkceCredential, PkceFailure, pkce_token_record
 
 BASE_URL: Final = "https://proxy.example.com"
@@ -215,6 +215,19 @@ def test_a_browser_the_user_picked_starts_the_sign_in_and_names_how_long_it_wait
     ]
 
 
+def test_the_browser_launcher_keeps_stdout_clean_and_never_rings_the_terminal_bell(
+    capfd: pytest.CaptureFixture[str], monkeypatch: pytest.MonkeyPatch, tmp_path: Path
+):
+    chatty_browser = tmp_path / "chatty-browser"
+    chatty_browser.write_text('#!/bin/sh\necho "Opening in existing browser session."\n')
+    chatty_browser.chmod(0o755)
+    monkeypatch.setenv("BROWSER", str(chatty_browser))
+
+    open_browser_off_stdout(f"{BASE_URL}/v1/cli/authorize?state=fake")
+
+    assert capfd.readouterr() == ("", "Opening in existing browser session.\n")
+
+
 @pytest.mark.parametrize(
     ("command", "method", "path", "body"),
     [