diff --git a/aider/args.py b/aider/args.py
index 554931fa8..2a55b4d28 100644
--- a/aider/args.py
+++ b/aider/args.py
@@ -46,7 +46,7 @@ def get_parser(default_config_files, git_root):
         const=opus_model,
         help=f"Use {opus_model} model for the main chat",
     )
-    sonnet_model = "claude-3-5-sonnet-20241022"
+    sonnet_model = "anthropic/claude-3-7-sonnet-20250219"
     group.add_argument(
         "--sonnet",
         action="store_const",
diff --git a/aider/models.py b/aider/models.py
index 4f4ed499b..870b6777b 100644
--- a/aider/models.py
+++ b/aider/models.py
@@ -76,7 +76,7 @@ ANTHROPIC_MODELS = [ln.strip() for ln in ANTHROPIC_MODELS.splitlines() if ln.str
 # Mapping of model aliases to their canonical names
 MODEL_ALIASES = {
     # Claude models
-    "sonnet": "claude-3-5-sonnet-20241022",
+    "sonnet": "anthropic/claude-3-7-sonnet-20250219",
     "haiku": "claude-3-5-haiku-20241022",
     "opus": "claude-3-opus-20240229",
     # GPT models