fix: change default model for new sessions to sonnet-4.6

components/ambient-api-server/plugins/agents/model.go

@@ -16,7 +16,7 @@ type Agent struct {
 	Prompt               *string `json:"prompt"                 gorm:"type:text"`
 	RepoUrl              *string `json:"repo_url"`
 	WorkflowId           *string `json:"workflow_id"`
-	LlmModel             string  `json:"llm_model"              gorm:"default:'sonnet'"`
+	LlmModel             string  `json:"llm_model"              gorm:"default:'claude-sonnet-4-6'"`
 	LlmTemperature       float64 `json:"llm_temperature"        gorm:"default:0.7"`
 	LlmMaxTokens         int32   `json:"llm_max_tokens"         gorm:"default:4000"`
 	BotAccountName       *string `json:"bot_account_name"`
@@ -41,7 +41,7 @@ func (l AgentList) Index() AgentIndex {
 func (d *Agent) BeforeCreate(tx *gorm.DB) error {
 	d.ID = api.NewID()
 	if d.LlmModel == "" {
-		d.LlmModel = "sonnet"
+		d.LlmModel = "claude-sonnet-4-6"
 	}
 	if d.LlmTemperature == 0 {
 		d.LlmTemperature = 0.7

components/ambient-api-server/plugins/sessions/integration_test.go

@@ -612,7 +612,7 @@ func TestSessionLlmDefaults(t *testing.T) {
 	Expect(resp.StatusCode).To(Equal(http.StatusCreated))
 
 	Expect(created.LlmModel).NotTo(BeNil(), "llm_model should be defaulted")
-	Expect(*created.LlmModel).To(Equal("sonnet"))
+	Expect(*created.LlmModel).To(Equal("claude-sonnet-4-6"))
 	Expect(created.LlmTemperature).NotTo(BeNil(), "llm_temperature should be defaulted")
 	Expect(*created.LlmTemperature).To(BeNumerically("~", 0.7, 0.001))
 	Expect(created.LlmMaxTokens).NotTo(BeNil(), "llm_max_tokens should be defaulted")
@@ -621,7 +621,7 @@ func TestSessionLlmDefaults(t *testing.T) {
 	fetched, resp, err := client.DefaultAPI.ApiAmbientV1SessionsIdGet(ctx, *created.Id).Execute()
 	Expect(err).NotTo(HaveOccurred())
 	Expect(resp.StatusCode).To(Equal(http.StatusOK))
-	Expect(*fetched.LlmModel).To(Equal("sonnet"))
+	Expect(*fetched.LlmModel).To(Equal("claude-sonnet-4-6"))
 	Expect(*fetched.LlmTemperature).To(BeNumerically("~", 0.7, 0.001))
 	Expect(*fetched.LlmMaxTokens).To(Equal(int32(4000)))
 }

components/ambient-api-server/plugins/sessions/model.go

@@ -58,7 +58,7 @@ func (d *Session) BeforeCreate(tx *gorm.DB) error {
 	d.KubeCrName = &d.ID
 
 	if d.LlmModel == nil || *d.LlmModel == "" {
-		defaultModel := "sonnet"
+		defaultModel := "claude-sonnet-4-6"
 		d.LlmModel = &defaultModel
 	}
 	if d.LlmTemperature == nil {

components/backend/handlers/models_test.go

@@ -37,16 +37,17 @@ var _ = Describe("Models Handler", Label(test_constants.LabelUnit, test_constant
 
 	validManifestObj := types.ModelManifest{
 		Version:      2,
-		DefaultModel: "claude-sonnet-4-5",
+		DefaultModel: "claude-sonnet-4-6",
 		ProviderDefaults: map[string]string{
-			"anthropic": "claude-sonnet-4-5",
+			"anthropic": "claude-sonnet-4-6",
 			"google":    "gemini-2.5-flash",
 		},
 		Models: []types.ModelEntry{
 			{ID: "claude-sonnet-4-5", Label: "Claude Sonnet 4.5", VertexID: "claude-sonnet-4-5@20250929", Provider: "anthropic", Available: true, FeatureGated: false},
 			{ID: "claude-opus-4-6", Label: "Claude Opus 4.6", VertexID: "claude-opus-4-6@default", Provider: "anthropic", Available: true, FeatureGated: true},
 			{ID: "claude-opus-4-5", Label: "Claude Opus 4.5", VertexID: "claude-opus-4-5@20251101", Provider: "anthropic", Available: true, FeatureGated: false},
 			{ID: "claude-haiku-4-5", Label: "Claude Haiku 4.5", VertexID: "claude-haiku-4-5@20251001", Provider: "anthropic", Available: true, FeatureGated: false},
+			{ID: "claude-sonnet-4-6", Label: "Claude Sonnet 4.6", VertexID: "claude-sonnet-4-6@default", Provider: "anthropic", Available: true, FeatureGated: false},
 			{ID: "gemini-2.5-flash", Label: "Gemini 2.5 Flash", VertexID: "gemini-2.5-flash", Provider: "google", Available: true, FeatureGated: false},
 			{ID: "gemini-2.5-pro", Label: "Gemini 2.5 Pro", VertexID: "gemini-2.5-pro", Provider: "google", Available: true, FeatureGated: true},
 		},
@@ -136,9 +137,9 @@ var _ = Describe("Models Handler", Label(test_constants.LabelUnit, test_constant
 			var resp types.ListModelsResponse
 			err := json.Unmarshal(httpTestUtils.GetResponseRecorder().Body.Bytes(), &resp)
 			Expect(err).NotTo(HaveOccurred())
-			// With no Unleash configured, IsModelEnabled returns true, so all 6 models pass
-			Expect(resp.Models).To(HaveLen(6))
-			Expect(resp.DefaultModel).To(Equal("claude-sonnet-4-5"))
+			// With no Unleash configured, IsModelEnabled returns true, so all 7 models pass
+			Expect(resp.Models).To(HaveLen(7))
+			Expect(resp.DefaultModel).To(Equal("claude-sonnet-4-6"))
 		})
 
 		It("should include model when workspace override is true", func() {
@@ -230,9 +231,9 @@ var _ = Describe("Models Handler", Label(test_constants.LabelUnit, test_constant
 			err := json.Unmarshal(httpTestUtils.GetResponseRecorder().Body.Bytes(), &resp)
 			Expect(err).NotTo(HaveOccurred())
 
-			// opus-4-6 excluded by override; the other 5 should still be present
-			// (default model + 4 non-default models via Unleash fallback which returns true when not configured)
-			Expect(resp.Models).To(HaveLen(5))
+			// opus-4-6 excluded by override; the other 6 should still be present
+			// (default model + 5 non-default models via Unleash fallback which returns true when not configured)
+			Expect(resp.Models).To(HaveLen(6))
 			ids := make([]string, len(resp.Models))
 			for i, m := range resp.Models {
 				ids[i] = m.ID
@@ -262,7 +263,7 @@ var _ = Describe("Models Handler", Label(test_constants.LabelUnit, test_constant
 
 			var foundDefault bool
 			for _, m := range resp.Models {
-				if m.ID == "claude-sonnet-4-5" && m.IsDefault {
+				if m.ID == "claude-sonnet-4-6" && m.IsDefault {
 					foundDefault = true
 					break
 				}
@@ -292,7 +293,7 @@ var _ = Describe("Models Handler", Label(test_constants.LabelUnit, test_constant
 			var resp types.ListModelsResponse
 			err = json.Unmarshal(httpTestUtils.GetResponseRecorder().Body.Bytes(), &resp)
 			Expect(err).NotTo(HaveOccurred())
-			Expect(resp.Models).To(HaveLen(5))
+			Expect(resp.Models).To(HaveLen(6))
 
 			for _, m := range resp.Models {
 				Expect(m.ID).NotTo(Equal("claude-opus-4-6"))
@@ -335,9 +336,9 @@ var _ = Describe("Models Handler", Label(test_constants.LabelUnit, test_constant
 			var resp types.ListModelsResponse
 			err := json.Unmarshal(httpTestUtils.GetResponseRecorder().Body.Bytes(), &resp)
 			Expect(err).NotTo(HaveOccurred())
-			// Cached manifest has 6 models and they go through flag filtering
-			Expect(resp.Models).To(HaveLen(6))
-			Expect(resp.DefaultModel).To(Equal("claude-sonnet-4-5"))
+			// Cached manifest has 7 models and they go through flag filtering
+			Expect(resp.Models).To(HaveLen(7))
+			Expect(resp.DefaultModel).To(Equal("claude-sonnet-4-6"))
 		})
 
 		It("should return 503 when JSON is malformed and no cache", func() {
@@ -376,8 +377,8 @@ var _ = Describe("Models Handler", Label(test_constants.LabelUnit, test_constant
 			for _, m := range resp.Models {
 				Expect(m.Provider).To(Equal("anthropic"), "All models should be anthropic")
 			}
-			Expect(resp.Models).To(HaveLen(4))
-			Expect(resp.DefaultModel).To(Equal("claude-sonnet-4-5"))
+			Expect(resp.Models).To(HaveLen(5))
+			Expect(resp.DefaultModel).To(Equal("claude-sonnet-4-6"))
 		})
 
 		It("should return only google models when provider=google", func() {
@@ -420,7 +421,7 @@ var _ = Describe("Models Handler", Label(test_constants.LabelUnit, test_constant
 			var resp types.ListModelsResponse
 			err := json.Unmarshal(httpTestUtils.GetResponseRecorder().Body.Bytes(), &resp)
 			Expect(err).NotTo(HaveOccurred())
-			Expect(resp.Models).To(HaveLen(6))
+			Expect(resp.Models).To(HaveLen(7))
 		})
 	})
 
@@ -459,10 +460,10 @@ var _ = Describe("Models Handler", Label(test_constants.LabelUnit, test_constant
 			manifest, err := LoadManifest(path)
 			Expect(err).NotTo(HaveOccurred())
 			Expect(manifest.Version).To(Equal(2))
-			Expect(manifest.DefaultModel).To(Equal("claude-sonnet-4-5"))
+			Expect(manifest.DefaultModel).To(Equal("claude-sonnet-4-6"))
 			Expect(manifest.ProviderDefaults).To(HaveLen(2))
 			Expect(manifest.ProviderDefaults["google"]).To(Equal("gemini-2.5-flash"))
-			Expect(manifest.Models).To(HaveLen(6))
+			Expect(manifest.Models).To(HaveLen(7))
 		})
 
 		It("should return error when file is missing", func() {
@@ -492,7 +493,7 @@ var _ = Describe("Models Handler", Label(test_constants.LabelUnit, test_constant
 			writeManifestFile(validManifest)
 			setupK8sWithOverrides()
 
-			result := isModelAvailable(context.Background(), K8sClient, "claude-sonnet-4-5", "", "test-ns")
+			result := isModelAvailable(context.Background(), K8sClient, "claude-sonnet-4-6", "", "test-ns")
 			Expect(result).To(BeTrue())
 		})
 

components/backend/handlers/sessions.go

@@ -682,7 +682,7 @@ func CreateSession(c *gin.Context) {
 
 	// Set defaults for LLM settings if not provided
 	llmSettings := types.LLMSettings{
-		Model:       "claude-sonnet-4-5",
+		Model:       "claude-sonnet-4-6",
 		Temperature: 0.7,
 		MaxTokens:   4000,
 	}

components/frontend/src/app/projects/[name]/sessions/[sessionName]/components/__tests__/new-session-view.test.tsx

@@ -4,11 +4,11 @@ import { NewSessionView } from '../new-session-view';
 
 vi.mock('../runner-model-selector', () => ({
   RunnerModelSelector: ({ onSelect }: { onSelect: (r: string, m: string) => void }) => (
-    <button data-testid="runner-model-selector" onClick={() => onSelect('claude-agent-sdk', 'claude-sonnet-4-5')}>
-      claude-agent-sdk · Claude Sonnet 4.5
+    <button data-testid="runner-model-selector" onClick={() => onSelect('claude-agent-sdk', 'claude-sonnet-4-6')}>
+      claude-agent-sdk · Claude Sonnet 4.6
     </button>
   ),
-  getDefaultModel: () => 'claude-sonnet-4-5',
+  getDefaultModel: () => 'claude-sonnet-4-6',
 }));
 
 vi.mock('@/services/queries/use-runner-types', () => ({
@@ -27,10 +27,10 @@ vi.mock('@/services/queries/use-models', () => ({
   useModels: () => ({
     data: {
       models: [
-        { id: 'claude-sonnet-4-5', label: 'Claude Sonnet 4.5', provider: 'anthropic', isDefault: true },
-        { id: 'claude-sonnet-4-6', label: 'Claude Sonnet 4.6', provider: 'anthropic', isDefault: false },
+        { id: 'claude-sonnet-4-5', label: 'Claude Sonnet 4.5', provider: 'anthropic', isDefault: false },
+        { id: 'claude-sonnet-4-6', label: 'Claude Sonnet 4.6', provider: 'anthropic', isDefault: true },
       ],
-      defaultModel: 'claude-sonnet-4-5',
+      defaultModel: 'claude-sonnet-4-6',
     },
     isLoading: false,
   }),
@@ -98,7 +98,7 @@ describe('NewSessionView', () => {
       expect.objectContaining({
         prompt: 'Build a REST API',
         runner: 'claude-agent-sdk',
-        model: 'claude-sonnet-4-5',
+        model: 'claude-sonnet-4-6',
       })
     );
   });

components/frontend/src/app/projects/[name]/sessions/[sessionName]/components/__tests__/runner-model-selector.test.tsx

@@ -26,12 +26,12 @@ const mockRunnerTypes: RunnerType[] = [
 const mockAnthropicModels: ListModelsResponse = {
   models: [
     { id: 'claude-haiku-4-5', label: 'Claude Haiku 4.5', provider: 'anthropic', isDefault: false },
-    { id: 'claude-sonnet-4-5', label: 'Claude Sonnet 4.5', provider: 'anthropic', isDefault: true },
-    { id: 'claude-sonnet-4-6', label: 'Claude Sonnet 4.6', provider: 'anthropic', isDefault: false },
+    { id: 'claude-sonnet-4-5', label: 'Claude Sonnet 4.5', provider: 'anthropic', isDefault: false },
+    { id: 'claude-sonnet-4-6', label: 'Claude Sonnet 4.6', provider: 'anthropic', isDefault: true },
     { id: 'claude-opus-4-5', label: 'Claude Opus 4.5', provider: 'anthropic', isDefault: false },
     { id: 'claude-opus-4-6', label: 'Claude Opus 4.6', provider: 'anthropic', isDefault: false },
   ],
-  defaultModel: 'claude-sonnet-4-5',
+  defaultModel: 'claude-sonnet-4-6',
 };
 
 const mockUseRunnerTypes = vi.fn(() => ({ data: mockRunnerTypes }));
@@ -49,7 +49,7 @@ describe('RunnerModelSelector', () => {
   const defaultProps = {
     projectName: 'test-project',
     selectedRunner: 'claude-code',
-    selectedModel: 'claude-sonnet-4-5',
+    selectedModel: 'claude-sonnet-4-6',
     onSelect: vi.fn(),
   };
 
@@ -63,7 +63,7 @@ describe('RunnerModelSelector', () => {
     render(<RunnerModelSelector {...defaultProps} />);
     const button = screen.getByRole('button');
     expect(button.textContent).toContain('Claude Code');
-    expect(button.textContent).toContain('Claude Sonnet 4.5');
+    expect(button.textContent).toContain('Claude Sonnet 4.6');
   });
 
   it('renders trigger button with unknown runner fallback', () => {

components/manifests/base/core/models.json

@@ -1,8 +1,8 @@
 {
   "version": 2,
-  "defaultModel": "claude-sonnet-4-5",
+  "defaultModel": "claude-sonnet-4-6",
   "providerDefaults": {
-    "anthropic": "claude-sonnet-4-5",
+    "anthropic": "claude-sonnet-4-6",
     "google": "gemini-2.5-flash"
   },
   "models": [
@@ -44,7 +44,7 @@
       "vertexId": "claude-sonnet-4-6@default",
       "provider": "anthropic",
       "available": true,
-      "featureGated": true
+      "featureGated": false
     },
     {
       "id": "gemini-2.5-flash",

components/manifests/base/crds/agenticsessions-crd.yaml

@@ -63,7 +63,7 @@ spec:
                 properties:
                   model:
                     type: string
-                    default: "claude-3-7-sonnet-latest"
+                    default: "claude-sonnet-4-6"
                   temperature:
                     type: number
                     default: 0.7

components/runners/ambient-runner/ambient_runner/bridges/claude/auth.py

@@ -72,8 +72,8 @@ async def setup_sdk_authentication(context: RunnerContext) -> tuple[str, bool, s
     model = context.get_env("LLM_MODEL")
 
     # Default model differs: Vertex AI uses @date suffixes, Anthropic API does not
-    DEFAULT_MODEL = "claude-sonnet-4-5"
-    DEFAULT_VERTEX_MODEL = "claude-sonnet-4-5@20250929"
+    DEFAULT_MODEL = "claude-sonnet-4-6"
+    DEFAULT_VERTEX_MODEL = "claude-sonnet-4-6@default"
 
     if api_key and not use_vertex:
         os.environ["ANTHROPIC_API_KEY"] = api_key

components/runners/ambient-runner/tests/test_claude_auth.py

@@ -155,7 +155,7 @@ async def test_default_model_when_none_specified(self, monkeypatch):
         monkeypatch.delenv("ANTHROPIC_API_KEY", raising=False)
         ctx = _make_context(ANTHROPIC_API_KEY="sk-key")
         _, _, model = await setup_sdk_authentication(ctx)
-        assert model == "claude-sonnet-4-5"
+        assert model == "claude-sonnet-4-6"
         assert "@" not in model  # no Vertex date suffix for API key auth
 
     @pytest.mark.asyncio