diff --git a/conf/openrouter_models.json b/conf/openrouter_models.json
index 46fabd2..e3b929d 100644
--- a/conf/openrouter_models.json
+++ b/conf/openrouter_models.json
@@ -24,6 +24,23 @@
     }
   },
   "models": [
+    {
+      "model_name": "anthropic/claude-opus-4.5",
+      "aliases": [
+        "opus",
+        "opus4.5",
+        "claude-opus"
+      ],
+      "context_window": 200000,
+      "max_output_tokens": 64000,
+      "supports_extended_thinking": false,
+      "supports_json_mode": false,
+      "supports_function_calling": false,
+      "supports_images": true,
+      "max_image_size_mb": 5.0,
+      "description": "Claude Opus 4.5 - Anthropic's frontier reasoning model for complex software engineering and agentic workflows",
+      "intelligence_score": 18
+    },
     {
       "model_name": "anthropic/claude-sonnet-4.5",
       "aliases": [
@@ -43,8 +60,7 @@
     {
       "model_name": "anthropic/claude-opus-4.1",
       "aliases": [
-        "opus",
-        "claude-opus"
+        "opus4.1"
       ],
       "context_window": 200000,
       "max_output_tokens": 64000,
@@ -53,7 +69,7 @@
       "supports_function_calling": false,
       "supports_images": true,
       "max_image_size_mb": 5.0,
-      "description": "Claude Opus 4.1 - Our most capable and intelligent model yet",
+      "description": "Claude Opus 4.1 - Last generation flagship model with strong coding and reasoning",
       "intelligence_score": 14
     },
     {
diff --git a/tests/test_openrouter_provider.py b/tests/test_openrouter_provider.py
index 092872a..846df94 100644
--- a/tests/test_openrouter_provider.py
+++ b/tests/test_openrouter_provider.py
@@ -79,7 +79,9 @@ class TestOpenRouterProvider:
         provider = OpenRouterProvider(api_key="test-key")
 
         # Test alias resolution
-        assert provider._resolve_model_name("opus") == "anthropic/claude-opus-4.1"
+        assert provider._resolve_model_name("opus") == "anthropic/claude-opus-4.5"
+        assert provider._resolve_model_name("opus4.5") == "anthropic/claude-opus-4.5"
+        assert provider._resolve_model_name("opus4.1") == "anthropic/claude-opus-4.1"
         assert provider._resolve_model_name("sonnet") == "anthropic/claude-sonnet-4.5"
         assert provider._resolve_model_name("sonnet4.1") == "anthropic/claude-sonnet-4.1"
         assert provider._resolve_model_name("o3") == "openai/o3"
@@ -96,7 +98,7 @@ class TestOpenRouterProvider:
         assert provider._resolve_model_name("r1") == "deepseek/deepseek-r1-0528"
 
         # Test case-insensitive
-        assert provider._resolve_model_name("OPUS") == "anthropic/claude-opus-4.1"
+        assert provider._resolve_model_name("OPUS") == "anthropic/claude-opus-4.5"
         assert provider._resolve_model_name("SONNET") == "anthropic/claude-sonnet-4.5"
         assert provider._resolve_model_name("O3") == "openai/o3"
         assert provider._resolve_model_name("Mistral") == "mistralai/mistral-large-2411"
@@ -305,17 +307,32 @@ class TestOpenRouterRegistry:
 
         registry = OpenRouterModelRegistry()
 
-        # Test known model
+        # Test known model (opus alias now points to 4.5)
         caps = registry.get_capabilities("opus")
         assert caps is not None
-        assert caps.model_name == "anthropic/claude-opus-4.1"
+        assert caps.model_name == "anthropic/claude-opus-4.5"
         assert caps.context_window == 200000  # Claude's context window
 
-        # Test using full model name
+        # Test using full model name for 4.5
+        caps = registry.get_capabilities("anthropic/claude-opus-4.5")
+        assert caps is not None
+        assert caps.model_name == "anthropic/claude-opus-4.5"
+
+        # Test opus4.5 alias
+        caps = registry.get_capabilities("opus4.5")
+        assert caps is not None
+        assert caps.model_name == "anthropic/claude-opus-4.5"
+
+        # Test using full model name for 4.1
         caps = registry.get_capabilities("anthropic/claude-opus-4.1")
         assert caps is not None
         assert caps.model_name == "anthropic/claude-opus-4.1"
 
+        # Test opus4.1 alias still works
+        caps = registry.get_capabilities("opus4.1")
+        assert caps is not None
+        assert caps.model_name == "anthropic/claude-opus-4.1"
+
         # Test unknown model
         caps = registry.get_capabilities("non-existent-model")
         assert caps is None
diff --git a/tests/test_openrouter_registry.py b/tests/test_openrouter_registry.py
index e1738e5..1194106 100644
--- a/tests/test_openrouter_registry.py
+++ b/tests/test_openrouter_registry.py
@@ -88,8 +88,11 @@ class TestOpenRouterModelRegistry:
 
         # Test various aliases
         test_cases = [
-            ("opus", "anthropic/claude-opus-4.1"),
-            ("OPUS", "anthropic/claude-opus-4.1"),  # Case insensitive
+            ("opus", "anthropic/claude-opus-4.5"),  # opus now points to 4.5
+            ("OPUS", "anthropic/claude-opus-4.5"),  # Case insensitive
+            ("claude-opus", "anthropic/claude-opus-4.5"),
+            ("opus4.5", "anthropic/claude-opus-4.5"),
+            ("opus4.1", "anthropic/claude-opus-4.1"),  # 4.1 still accessible
             ("sonnet", "anthropic/claude-sonnet-4.5"),
             ("o3", "openai/o3"),
             ("deepseek", "deepseek/deepseek-r1-0528"),
@@ -131,9 +134,10 @@ class TestOpenRouterModelRegistry:
         assert config is not None
 
         # Registry now returns ModelCapabilities objects directly
+        # opus alias now points to 4.5
         assert config.provider == ProviderType.OPENROUTER
-        assert config.model_name == "anthropic/claude-opus-4.1"
-        assert config.friendly_name == "OpenRouter (anthropic/claude-opus-4.1)"
+        assert config.model_name == "anthropic/claude-opus-4.5"
+        assert config.friendly_name == "OpenRouter (anthropic/claude-opus-4.5)"
         assert config.context_window == 200000
         assert not config.supports_extended_thinking