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)

Author: waleedlatif1

apps/sim/providers/anthropic/core.ts

@@ -84,13 +84,15 @@ const THINKING_BUDGET_TOKENS: Record<string, number> = {
 
 /**
  * Checks if a model supports adaptive thinking (thinking.type: "adaptive").
+ * Sonnet 5 supports ONLY adaptive thinking (manual budget_tokens returns a 400 error).
  * Opus 4.8 and Opus 4.7 support ONLY adaptive thinking (no extended thinking / budget_tokens).
  * Opus 4.6 and Sonnet 4.6 support both extended and adaptive thinking — use adaptive.
  * Opus 4.5 supports effort but NOT adaptive thinking — it uses budget_tokens with type: "enabled".
  */
 function supportsAdaptiveThinking(modelId: string): boolean {
   const normalizedModel = modelId.toLowerCase()
   return (
+    normalizedModel.includes('sonnet-5') ||
     normalizedModel.includes('opus-4-8') ||
     normalizedModel.includes('opus-4.8') ||
     normalizedModel.includes('opus-4-7') ||
@@ -105,7 +107,7 @@ function supportsAdaptiveThinking(modelId: string): boolean {
 /**
  * Builds the thinking configuration for the Anthropic API based on model capabilities and level.
  *
- * - Opus 4.8, Opus 4.7: Uses adaptive thinking only (no extended thinking support)
+ * - Sonnet 5, Opus 4.8, Opus 4.7: Uses adaptive thinking only (no extended thinking support)
  * - Opus 4.6, Sonnet 4.6: Uses adaptive thinking with effort parameter
  * - Other models: Uses budget_tokens-based extended thinking
  *

apps/sim/providers/models.ts

@@ -661,14 +661,34 @@ export const PROVIDER_DEFINITIONS: Record<string, ProviderDefinition> = {
     fileAttachment: { maxBytes: 50 * 1024 * 1024, strategy: 'remote-url' },
     name: 'Anthropic',
     description: "Anthropic's Claude models",
-    defaultModel: 'claude-sonnet-4-6',
+    defaultModel: 'claude-sonnet-5',
     modelPatterns: [/^claude/],
     icon: AnthropicIcon,
     color: '#D97757',
     capabilities: {
       toolUsageControl: true,
     },
     models: [
+      {
+        id: 'claude-sonnet-5',
+        pricing: {
+          input: 2.0,
+          cachedInput: 0.2,
+          output: 10.0,
+          updatedAt: '2026-06-30',
+        },
+        capabilities: {
+          nativeStructuredOutputs: true,
+          maxOutputTokens: 128000,
+          thinking: {
+            levels: ['low', 'medium', 'high', 'xhigh', 'max'],
+            default: 'high',
+          },
+        },
+        contextWindow: 1000000,
+        releaseDate: '2026-06-30',
+        recommended: true,
+      },
       {
         id: 'claude-opus-4-8',
         pricing: {
@@ -747,7 +767,6 @@ export const PROVIDER_DEFINITIONS: Record<string, ProviderDefinition> = {
         },
         contextWindow: 1000000,
         releaseDate: '2026-02-17',
-        recommended: true,
       },
       {
         id: 'claude-opus-4-5',