diff --git a/aider/args.py b/aider/args.py
index 2091a39cd..2b18fb6a0 100644
--- a/aider/args.py
+++ b/aider/args.py
@@ -117,12 +117,6 @@ def get_parser(default_config_files, git_root):
         const=deepseek_model,
         help=f"Use {deepseek_model} model for the main chat",
     )
-    group.add_argument(
-        "--deepseek-beta",
-        action="store_true",
-        help="Uses DeepSeek Coder via the beta API endpoint",
-        default=False,
-    )
 
     ##########
     group = parser.add_argument_group("Model Settings")
diff --git a/aider/main.py b/aider/main.py
index 911f09ed7..de50dbc70 100644
--- a/aider/main.py
+++ b/aider/main.py
@@ -461,10 +461,6 @@ def main(argv=None, input=None, output=None, force_git_root=None, return_coder=F
         if os.environ.get("ANTHROPIC_API_KEY"):
             args.model = "claude-3-5-sonnet-20240620"
 
-    if args.deepseek_beta:
-        args.model = "deepseek/deepseek-coder"
-        os.environ["DEEPSEEK_API_BASE"] = "https://api.deepseek.com/beta"
-
     main_model = models.Model(args.model, weak_model=args.weak_model)
 
     lint_cmds = parse_lint_cmds(args.lint_cmd, io)
diff --git a/aider/sendchat.py b/aider/sendchat.py
index 06505910c..29ba668ce 100644
--- a/aider/sendchat.py
+++ b/aider/sendchat.py
@@ -1,6 +1,5 @@
 import hashlib
 import json
-import os
 
 import backoff
 
@@ -59,11 +58,6 @@ def send_completion(
         stream=stream,
     )
 
-    if model_name.startswith("deepseek/"):
-        if "DEEPSEEK_API_BASE" in os.environ:
-            kwargs["base_url"] = os.environ["DEEPSEEK_API_BASE"]
-        elif getattr(kwargs.get('extra_headers', {}), 'deepseek_beta', False):
-            kwargs["base_url"] = "https://api.deepseek.com/v1"
     if functions is not None:
         kwargs["functions"] = functions
     if extra_headers is not None: