diff --git a/lib/ruby_llm/configuration.rb b/lib/ruby_llm/configuration.rb
index 34a842c2f..ed9847975 100644
--- a/lib/ruby_llm/configuration.rb
+++ b/lib/ruby_llm/configuration.rb
@@ -19,6 +19,7 @@ class Configuration
                   :bedrock_region,
                   :bedrock_session_token,
                   :openrouter_api_key,
+                  :openrouter_api_base,
                   :ollama_api_base,
                   :gpustack_api_base,
                   :gpustack_api_key,
diff --git a/lib/ruby_llm/providers/openrouter.rb b/lib/ruby_llm/providers/openrouter.rb
index e8056b027..64104ab49 100644
--- a/lib/ruby_llm/providers/openrouter.rb
+++ b/lib/ruby_llm/providers/openrouter.rb
@@ -7,7 +7,7 @@ class OpenRouter < OpenAI
       include OpenRouter::Models
 
       def api_base
-        'https://openrouter.ai/api/v1'
+        @config.openrouter_api_base || 'https://openrouter.ai/api/v1'
       end
 
       def headers