Add support for customizing the model file path

lib/ruby_llm/configuration.rb

@@ -29,6 +29,8 @@ class Configuration
                   :gpustack_api_base,
                   :gpustack_api_key,
                   :mistral_api_key,
+                  # Model configuration
+                  :model_file_path,
                   # Default models
                   :default_model,
                   :default_embedding_model,
@@ -55,6 +57,8 @@ def initialize
       @retry_interval_randomness = 0.5
       @http_proxy = nil
 
+      @model_file_path = File.expand_path('models.json', __dir__)
+
       # Default models
       @default_model = 'gpt-4.1-nano'
       @default_embedding_model = 'text-embedding-3-small'

lib/ruby_llm/models.rb

@@ -22,7 +22,7 @@ def provider_for(model)
       end
 
       def models_file
-        File.expand_path('models.json', __dir__)
+        RubyLLM.config.model_file_path
       end
 
       def refresh!

spec/ruby_llm/models_spec.rb

@@ -11,6 +11,22 @@
     described_class.instance_variable_set(:@instance, nil)
   end
 
+  describe 'models file' do
+    it 'uses the bundled model file by default' do
+      expect(described_class.models_file).to eq(
+        File.expand_path(File.join(__dir__, '..', '..', 'lib', 'ruby_llm', 'models.json'))
+      )
+    end
+
+    it 'supports customization' do
+      RubyLLM.config.model_file_path = File.join(Dir.tmpdir, 'foobar.json')
+
+      expect(described_class.models_file).to eq(
+        File.join(Dir.tmpdir, 'foobar.json')
+      )
+    end
+  end
+
   describe 'filtering and chaining' do
     it 'filters models by provider' do
       openai_models = RubyLLM.models.by_provider('openai')

spec/spec_helper.rb

@@ -144,6 +144,8 @@
       config.retry_interval = 1
       config.retry_backoff_factor = 3
       config.retry_interval_randomness = 0.5
+
+      config.model_file_path = File.expand_path(File.join(__dir__, '..', 'lib', 'ruby_llm', 'models.json'))
     end
   end
 end