diff --git a/src/adapters/claude_adapter.py b/src/adapters/claude_adapter.py
index f814878..4f0734d 100644
--- a/src/adapters/claude_adapter.py
+++ b/src/adapters/claude_adapter.py
@@ -17,10 +17,14 @@ logger = logging.getLogger(__name__)
 class ClaudeAdapter(ModelAdapter):
     """Adapter for the Anthropic Claude API."""
 
-    def __init__(self, api_key: str | None = None) -> None:
-        self._client = anthropic.AsyncAnthropic(
-            api_key=api_key or settings.anthropic_api_key,
-        )
+    def __init__(self, api_key: str | None = None, base_url: str | None = None) -> None:
+        kwargs: dict[str, Any] = {
+            "api_key": api_key or settings.anthropic_api_key,
+        }
+        url = base_url or settings.anthropic_base_url
+        if url:
+            kwargs["base_url"] = url
+        self._client = anthropic.AsyncAnthropic(**kwargs)
 
     # ------------------------------------------------------------------
     # Streaming
diff --git a/src/config.py b/src/config.py
index a30bf59..ba58d0b 100644
--- a/src/config.py
+++ b/src/config.py
@@ -29,6 +29,7 @@ class Settings(BaseSettings):
 
     # --- Model providers ---
     anthropic_api_key: str = ""
+    anthropic_base_url: str = ""  # Custom base URL (for MiniMax Anthropic-compatible, etc.)
     openai_api_key: str = ""
     openai_base_url: str = ""  # Custom base URL (for MiniMax, DeepInfra, etc.)
     default_model_provider: str = "claude"