diff --git a/.env.example b/.env.example
index 226fb2a..b1e6836 100644
--- a/.env.example
+++ b/.env.example
@@ -12,6 +12,7 @@ OPENAI_API_KEY=
 
 # Anthropic (used when LLM_PROVIDER=anthropic)
 ANTHROPIC_API_KEY=
+# ANTHROPIC_BASE_URL=https://your-proxy.example.com  # optional; routes Anthropic API calls via a custom proxy
 # LLM_MODEL=claude-opus-4-7  # optional override; default: claude-opus-4-7
 # CHART_LLM_MODEL=claude-haiku-4-5
 
diff --git a/backend/src/analytics_agent/agent/llm.py b/backend/src/analytics_agent/agent/llm.py
index 0e1c30c..3e7c4c9 100644
--- a/backend/src/analytics_agent/agent/llm.py
+++ b/backend/src/analytics_agent/agent/llm.py
@@ -16,6 +16,8 @@ def _make_anthropic(model: str, streaming: bool) -> BaseChatModel:
     kwargs: dict = {"model_name": model, "streaming": streaming}
     if settings.anthropic_api_key:
         kwargs["api_key"] = SecretStr(settings.anthropic_api_key)
+    if settings.anthropic_base_url:
+        kwargs["anthropic_api_url"] = settings.anthropic_base_url
     return ChatAnthropic(**kwargs)  # type: ignore[call-arg]
 
 
diff --git a/backend/src/analytics_agent/config.py b/backend/src/analytics_agent/config.py
index 193a59e..24f6caf 100644
--- a/backend/src/analytics_agent/config.py
+++ b/backend/src/analytics_agent/config.py
@@ -175,6 +175,7 @@ class Settings(BaseSettings):
     llm_provider: str = "openai"
     openai_api_key: str = ""
     anthropic_api_key: str = ""
+    anthropic_base_url: str = ""
     google_api_key: str = ""
     # Bedrock — uses the standard AWS credential chain by default (env vars,
     # ~/.aws/credentials, IAM role). Set the explicit *_key_id/*_access_key