diff --git a/aider/models.py b/aider/models.py
index fe92e8aa5..f78376948 100644
--- a/aider/models.py
+++ b/aider/models.py
@@ -248,7 +248,7 @@ class ModelInfoManager:
             html = response.text
             import re
             if re.search(rf'The model\s*.*{re.escape(url_part)}.* is not available', html, re.IGNORECASE):
-                print(f"Error: Model '{url_part}' is not available")
+                print(f"\033[91mError: Model '{url_part}' is not available\033[0m")
                 sys.exit(1)
             text = re.sub(r'<[^>]+>', ' ', html)
             context_match = re.search(r"([\d,]+)\s*context", text)