diff --git a/src/services/api/client.ts b/src/services/api/client.ts
index 8c1feb69..d5bae862 100644
--- a/src/services/api/client.ts
+++ b/src/services/api/client.ts
@@ -303,11 +303,13 @@ export async function getAnthropicClient({
     authToken: isClaudeAISubscriber()
       ? getClaudeAIOAuthTokens()?.accessToken
       : undefined,
-    // Set baseURL from OAuth config when using staging OAuth
-    ...(process.env.USER_TYPE === 'ant' &&
-    isEnvTruthy(process.env.USE_STAGING_OAUTH)
-      ? { baseURL: getOauthConfig().BASE_API_URL }
-      : {}),
+    // Set baseURL from environment variable if provided
+    ...(process.env.ANTHROPIC_BASE_URL
+      ? { baseURL: process.env.ANTHROPIC_BASE_URL }
+      : process.env.USER_TYPE === 'ant' &&
+        isEnvTruthy(process.env.USE_STAGING_OAUTH)
+        ? { baseURL: getOauthConfig().BASE_API_URL }
+        : {}),
     ...ARGS,
     ...(isDebugToStdErr() && { logger: createStderrLogger() }),
   }