diff --git a/aider/args.py b/aider/args.py
index 852b42ee2..c083f21a1 100644
--- a/aider/args.py
+++ b/aider/args.py
@@ -66,6 +66,14 @@ def get_parser(default_config_files, git_root):
         const=sonnet_model,
         help=f"Use {sonnet_model} model for the main chat",
     )
+    haiku_model = "claude-3-5-haiku-20241022"
+    group.add_argument(
+        "--haiku",
+        action="store_const",
+        dest="model",
+        const=haiku_model,
+        help=f"Use {haiku_model} model for the main chat",
+    )
     gpt_4_model = "gpt-4-0613"
     group.add_argument(
         "--4",