feat(blocks): default agent-family blocks to claude-sonnet-5

Propagate the Sonnet 5 flagship promotion to the block/executor/UI defaults so the default model is consistent everywhere:
- agent/router/evaluator/pi block defaultValue + agent runtime fallback
- executor AGENT/ROUTER/EVALUATOR DEFAULT_MODEL constants + pi-handler DEFAULT_MODEL
- combobox model-field default fallback
- update coupled tests (blocks, router/evaluator handlers, copilot model-suggestion validation) to the new default/recommended set

Stagehand's anthropic model pin is left on claude-sonnet-4-6 (separate tool-internal choice, not a block default).

Author: waleedlatif1

apps/sim/app/workspace/[workspaceId]/w/[workflowId]/components/panel/components/editor/components/sub-block/components/combobox/combobox.tsx

@@ -23,7 +23,7 @@ import { useWorkflowStore } from '@/stores/workflows/workflow/store'
 /**
  * Constants for ComboBox component behavior
  */
-const DEFAULT_MODEL = 'claude-sonnet-4-6'
+const DEFAULT_MODEL = 'claude-sonnet-5'
 const ZOOM_FACTOR_BASE = 0.96
 const MIN_ZOOM = 0.1
 const MAX_ZOOM = 1
@@ -238,7 +238,7 @@ export const ComboBox = memo(function ComboBox({
 
   /**
    * Determines the default option value to use.
-   * Priority: explicit defaultValue > claude-sonnet-4-6 for model field > first option
+   * Priority: explicit defaultValue > claude-sonnet-5 for model field > first option
    */
   const defaultOptionValue = useMemo(() => {
     if (defaultValue !== undefined) {
@@ -250,7 +250,7 @@ export const ComboBox = memo(function ComboBox({
       // Default not available (e.g. provider disabled) — fall through to other fallbacks
     }
 
-    // For model field, default to claude-sonnet-4-6 if available
+    // For model field, default to claude-sonnet-5 if available
     if (subBlockId === 'model') {
       const defaultModelOption = evaluatedOptions.find(
         (opt) => getOptionValue(opt) === DEFAULT_MODEL

apps/sim/blocks/blocks.test.ts

@@ -510,7 +510,7 @@ describe.concurrent('Blocks Module', () => {
         expect(modelSubBlock).toBeDefined()
         expect(modelSubBlock?.type).toBe('combobox')
         expect(modelSubBlock?.required).toBe(true)
-        expect(modelSubBlock?.defaultValue).toBe('claude-sonnet-4-6')
+        expect(modelSubBlock?.defaultValue).toBe('claude-sonnet-5')
       })
 
       it('should have LLM tool access', () => {

apps/sim/blocks/blocks/agent.ts

@@ -130,7 +130,7 @@ Return ONLY the JSON array.`,
       type: 'combobox',
       placeholder: 'Type or select a model...',
       required: true,
-      defaultValue: 'claude-sonnet-4-6',
+      defaultValue: 'claude-sonnet-5',
       options: getModelOptions,
       commandSearchable: true,
     },
@@ -503,7 +503,7 @@ Return ONLY the JSON array.`,
     ],
     config: {
       tool: (params: Record<string, any>) => {
-        const model = params.model || 'claude-sonnet-4-6'
+        const model = params.model || 'claude-sonnet-5'
         if (!model) {
           throw new Error('No model selected')
         }

apps/sim/blocks/blocks/evaluator.ts

@@ -177,7 +177,7 @@ export const EvaluatorBlock: BlockConfig<EvaluatorResponse> = {
       type: 'combobox',
       placeholder: 'Type or select a model...',
       required: true,
-      defaultValue: 'claude-sonnet-4-6',
+      defaultValue: 'claude-sonnet-5',
       options: getModelOptions,
     },
     ...getProviderCredentialSubBlocks(),

apps/sim/blocks/blocks/pi.ts

@@ -93,7 +93,7 @@ export const PiBlock: BlockConfig<PiResponse> = {
       type: 'combobox',
       placeholder: 'Type or select a model...',
       required: true,
-      defaultValue: 'claude-sonnet-4-6',
+      defaultValue: 'claude-sonnet-5',
       options: getPiModelOptions,
       commandSearchable: true,
     },

apps/sim/blocks/blocks/router.ts

@@ -171,7 +171,7 @@ export const RouterBlock: BlockConfig<RouterResponse> = {
       type: 'combobox',
       placeholder: 'Type or select a model...',
       required: true,
-      defaultValue: 'claude-sonnet-4-6',
+      defaultValue: 'claude-sonnet-5',
       options: getModelOptions,
     },
     ...getProviderCredentialSubBlocks(),
@@ -298,7 +298,7 @@ export const RouterV2Block: BlockConfig<RouterV2Response> = {
       type: 'combobox',
       placeholder: 'Type or select a model...',
       required: true,
-      defaultValue: 'claude-sonnet-4-6',
+      defaultValue: 'claude-sonnet-5',
       options: getModelOptions,
     },
     ...getProviderCredentialSubBlocks(),

apps/sim/executor/constants.ts

@@ -207,7 +207,7 @@ export const HTTP = {
 } as const
 
 export const AGENT = {
-  DEFAULT_MODEL: 'claude-sonnet-4-6',
+  DEFAULT_MODEL: 'claude-sonnet-5',
   get DEFAULT_FUNCTION_TIMEOUT() {
     return getMaxExecutionTimeout()
   },
@@ -242,13 +242,13 @@ export const MEMORY = {
 } as const
 
 export const ROUTER = {
-  DEFAULT_MODEL: 'claude-sonnet-4-6',
+  DEFAULT_MODEL: 'claude-sonnet-5',
   DEFAULT_TEMPERATURE: 0,
   INFERENCE_TEMPERATURE: 0.1,
 } as const
 
 export const EVALUATOR = {
-  DEFAULT_MODEL: 'claude-sonnet-4-6',
+  DEFAULT_MODEL: 'claude-sonnet-5',
   DEFAULT_TEMPERATURE: 0.1,
   RESPONSE_SCHEMA_NAME: 'evaluation_response',
   JSON_INDENT: 2,

apps/sim/executor/handlers/evaluator/evaluator-handler.test.ts

@@ -481,7 +481,7 @@ describe('EvaluatorBlockHandler', () => {
         json: () =>
           Promise.resolve({
             content: JSON.stringify({ score: 7 }),
-            model: 'claude-sonnet-4-6',
+            model: 'claude-sonnet-5',
             tokens: {},
             cost: 0,
             timing: {},
@@ -494,6 +494,6 @@ describe('EvaluatorBlockHandler', () => {
     const fetchCallArgs = mockFetch.mock.calls[0]
     const requestBody = JSON.parse(fetchCallArgs[1].body)
 
-    expect(requestBody.model).toBe('claude-sonnet-4-6')
+    expect(requestBody.model).toBe('claude-sonnet-5')
   })
 })

apps/sim/executor/handlers/pi/pi-handler.ts

@@ -37,7 +37,7 @@ import type {
 import type { SerializedBlock } from '@/serializer/types'
 
 const logger = createLogger('PiBlockHandler')
-const DEFAULT_MODEL = 'claude-sonnet-4-6'
+const DEFAULT_MODEL = 'claude-sonnet-5'
 
 function asOptString(value: unknown): string | undefined {
   if (typeof value !== 'string') return undefined

apps/sim/executor/handlers/router/router-handler.test.ts

@@ -238,12 +238,12 @@ describe('RouterBlockHandler', () => {
 
     await handler.execute(mockContext, mockBlock, inputs)
 
-    expect(mockGetProviderFromModel).toHaveBeenCalledWith('claude-sonnet-4-6')
+    expect(mockGetProviderFromModel).toHaveBeenCalledWith('claude-sonnet-5')
 
     const fetchCallArgs = mockFetch.mock.calls[0]
     const requestBody = JSON.parse(fetchCallArgs[1].body)
     expect(requestBody).toMatchObject({
-      model: 'claude-sonnet-4-6',
+      model: 'claude-sonnet-5',
       temperature: 0.1,
     })
   })