feat(providers): add Claude Sonnet 5 model (#5291)

* feat(providers): add Claude Sonnet 5 model

- Add claude-sonnet-5 (1M context, 128k output, adaptive thinking with low/medium/high/xhigh/max effort) as the new flagship Anthropic Sonnet
- Use introductory pricing ($2/$10 per MTok, $0.20 cached) in effect through Aug 31 2026
- Promote to recommended and set as Anthropic defaultModel; demote claude-sonnet-4-6
- Route claude-sonnet-5 through adaptive thinking in anthropic/core.ts (manual budget_tokens returns a 400)

* fix(providers): expose temperature capability on claude-sonnet-5

Sonnet 5 accepts the temperature parameter (0-1, per Anthropic API docs), and it replaces claude-sonnet-4-6 as the default/recommended Anthropic model. Omitting the capability silently dropped temperature control for workflows on the default model. The request builder already strips temperature whenever thinking is active, so this only takes effect when thinking is disabled — where temperature is valid.

* 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,
     })
   })