feat: update Claude model to Opus 4.6 and enhance adaptive thinking support

- Changed model identifier from `claude-opus-4-5-20251101` to `claude-opus-4-6` across various files, including documentation and code references.
- Updated the SDK to support adaptive thinking for Opus 4.6, allowing the model to determine its own reasoning depth.
- Enhanced the thinking level options to include 'adaptive' and adjusted related components to reflect this change.
- Updated tests to ensure compatibility with the new model and its features.

These changes improve the model's capabilities and user experience by leveraging adaptive reasoning.

apps/server/package.json

@@ -24,7 +24,7 @@
     "test:unit": "vitest run tests/unit"
   },
   "dependencies": {
-    "@anthropic-ai/claude-agent-sdk": "0.1.76",
+    "@anthropic-ai/claude-agent-sdk": "0.2.32",
     "@automaker/dependency-resolver": "1.0.0",
     "@automaker/git-utils": "1.0.0",
     "@automaker/model-resolver": "1.0.0",

apps/server/src/lib/sdk-options.ts

@@ -253,11 +253,27 @@ function buildMcpOptions(config: CreateSdkOptionsConfig): McpOptions {
 /**
  * Build thinking options for SDK configuration.
  * Converts ThinkingLevel to maxThinkingTokens for the Claude SDK.
+ * For adaptive thinking (Opus 4.6), omits maxThinkingTokens to let the model
+ * decide its own reasoning depth.
  *
  * @param thinkingLevel - The thinking level to convert
- * @returns Object with maxThinkingTokens if thinking is enabled
+ * @returns Object with maxThinkingTokens if thinking is enabled with a budget
  */
 function buildThinkingOptions(thinkingLevel?: ThinkingLevel): Partial<Options> {
+  if (!thinkingLevel || thinkingLevel === 'none') {
+    return {};
+  }
+
+  // Adaptive thinking (Opus 4.6): don't set maxThinkingTokens
+  // The model will use adaptive thinking by default
+  if (thinkingLevel === 'adaptive') {
+    logger.debug(
+      `buildThinkingOptions: thinkingLevel="adaptive" -> no maxThinkingTokens (model decides)`
+    );
+    return {};
+  }
+
+  // Manual budget-based thinking for Haiku/Sonnet
   const maxThinkingTokens = getThinkingTokenBudget(thinkingLevel);
   logger.debug(
     `buildThinkingOptions: thinkingLevel="${thinkingLevel}" -> maxThinkingTokens=${maxThinkingTokens}`

apps/server/src/providers/claude-provider.ts

@@ -219,8 +219,11 @@ export class ClaudeProvider extends BaseProvider {
     // claudeCompatibleProvider takes precedence over claudeApiProfile
     const providerConfig = claudeCompatibleProvider || claudeApiProfile;
 
-    // Convert thinking level to token budget
-    const maxThinkingTokens = getThinkingTokenBudget(thinkingLevel);
+    // Build thinking configuration
+    // Adaptive thinking (Opus 4.6): don't set maxThinkingTokens, model uses adaptive by default
+    // Manual thinking (Haiku/Sonnet): use budget_tokens
+    const maxThinkingTokens =
+      thinkingLevel === 'adaptive' ? undefined : getThinkingTokenBudget(thinkingLevel);
 
     // Build Claude SDK options
     const sdkOptions: Options = {
@@ -349,13 +352,13 @@ export class ClaudeProvider extends BaseProvider {
   getAvailableModels(): ModelDefinition[] {
     const models = [
       {
-        id: 'claude-opus-4-5-20251101',
-        name: 'Claude Opus 4.5',
-        modelString: 'claude-opus-4-5-20251101',
+        id: 'claude-opus-4-6',
+        name: 'Claude Opus 4.6',
+        modelString: 'claude-opus-4-6',
         provider: 'anthropic',
-        description: 'Most capable Claude model',
+        description: 'Most capable Claude model with adaptive thinking',
         contextWindow: 200000,
-        maxOutputTokens: 16000,
+        maxOutputTokens: 128000,
         supportsVision: true,
         supportsTools: true,
         tier: 'premium' as const,

apps/server/src/providers/provider-factory.ts

@@ -103,7 +103,7 @@ export class ProviderFactory {
   /**
    * Get the appropriate provider for a given model ID
    *
-   * @param modelId Model identifier (e.g., "claude-opus-4-5-20251101", "cursor-gpt-4o", "cursor-auto")
+   * @param modelId Model identifier (e.g., "claude-opus-4-6", "cursor-gpt-4o", "cursor-auto")
    * @param options Optional settings
    * @param options.throwOnDisconnected Throw error if provider is disconnected (default: true)
    * @returns Provider instance for the model

apps/server/tests/unit/lib/model-resolver.test.ts

@@ -35,7 +35,7 @@ describe('model-resolver.ts', () => {
 
     it("should resolve 'opus' alias to full model string", () => {
       const result = resolveModelString('opus');
-      expect(result).toBe('claude-opus-4-5-20251101');
+      expect(result).toBe('claude-opus-4-6');
       expect(consoleSpy.log).toHaveBeenCalledWith(
         expect.stringContaining('Migrated legacy ID: "opus" -> "claude-opus"')
       );
@@ -117,7 +117,7 @@ describe('model-resolver.ts', () => {
   describe('getEffectiveModel', () => {
     it('should prioritize explicit model over session and default', () => {
       const result = getEffectiveModel('opus', 'haiku', 'gpt-5.2');
-      expect(result).toBe('claude-opus-4-5-20251101');
+      expect(result).toBe('claude-opus-4-6');
     });
 
     it('should use session model when explicit is not provided', () => {

apps/server/tests/unit/lib/sdk-options.test.ts

@@ -491,5 +491,29 @@ describe('sdk-options.ts', () => {
         expect(options.maxThinkingTokens).toBeUndefined();
       });
     });
+
+    describe('adaptive thinking for Opus 4.6', () => {
+      it('should not set maxThinkingTokens for adaptive thinking (model decides)', async () => {
+        const { createAutoModeOptions } = await import('@/lib/sdk-options.js');
+
+        const options = createAutoModeOptions({
+          cwd: '/test/path',
+          thinkingLevel: 'adaptive',
+        });
+
+        expect(options.maxThinkingTokens).toBeUndefined();
+      });
+
+      it('should not include maxThinkingTokens when thinkingLevel is "none"', async () => {
+        const { createAutoModeOptions } = await import('@/lib/sdk-options.js');
+
+        const options = createAutoModeOptions({
+          cwd: '/test/path',
+          thinkingLevel: 'none',
+        });
+
+        expect(options.maxThinkingTokens).toBeUndefined();
+      });
+    });
   });
 });

apps/server/tests/unit/providers/claude-provider.test.ts

@@ -39,7 +39,7 @@ describe('claude-provider.ts', () => {
 
       const generator = provider.executeQuery({
         prompt: 'Hello',
-        model: 'claude-opus-4-5-20251101',
+        model: 'claude-opus-4-6',
         cwd: '/test',
       });
 
@@ -59,7 +59,7 @@ describe('claude-provider.ts', () => {
 
       const generator = provider.executeQuery({
         prompt: 'Test prompt',
-        model: 'claude-opus-4-5-20251101',
+        model: 'claude-opus-4-6',
         cwd: '/test/dir',
         systemPrompt: 'You are helpful',
         maxTurns: 10,
@@ -71,7 +71,7 @@ describe('claude-provider.ts', () => {
       expect(sdk.query).toHaveBeenCalledWith({
         prompt: 'Test prompt',
         options: expect.objectContaining({
-          model: 'claude-opus-4-5-20251101',
+          model: 'claude-opus-4-6',
           systemPrompt: 'You are helpful',
           maxTurns: 10,
           cwd: '/test/dir',
@@ -91,7 +91,7 @@ describe('claude-provider.ts', () => {
 
       const generator = provider.executeQuery({
         prompt: 'Test',
-        model: 'claude-opus-4-5-20251101',
+        model: 'claude-opus-4-6',
         cwd: '/test',
       });
 
@@ -116,7 +116,7 @@ describe('claude-provider.ts', () => {
 
       const generator = provider.executeQuery({
         prompt: 'Test',
-        model: 'claude-opus-4-5-20251101',
+        model: 'claude-opus-4-6',
         cwd: '/test',
         abortController,
       });
@@ -145,7 +145,7 @@ describe('claude-provider.ts', () => {
 
       const generator = provider.executeQuery({
         prompt: 'Current message',
-        model: 'claude-opus-4-5-20251101',
+        model: 'claude-opus-4-6',
         cwd: '/test',
         conversationHistory,
         sdkSessionId: 'test-session-id',
@@ -176,7 +176,7 @@ describe('claude-provider.ts', () => {
 
       const generator = provider.executeQuery({
         prompt: arrayPrompt as any,
-        model: 'claude-opus-4-5-20251101',
+        model: 'claude-opus-4-6',
         cwd: '/test',
       });
 
@@ -196,7 +196,7 @@ describe('claude-provider.ts', () => {
 
       const generator = provider.executeQuery({
         prompt: 'Test',
-        model: 'claude-opus-4-5-20251101',
+        model: 'claude-opus-4-6',
         cwd: '/test',
       });
 
@@ -222,7 +222,7 @@ describe('claude-provider.ts', () => {
 
       const generator = provider.executeQuery({
         prompt: 'Test',
-        model: 'claude-opus-4-5-20251101',
+        model: 'claude-opus-4-6',
         cwd: '/test',
       });
 
@@ -286,7 +286,7 @@ describe('claude-provider.ts', () => {
 
       const generator = provider.executeQuery({
         prompt: 'Test',
-        model: 'claude-opus-4-5-20251101',
+        model: 'claude-opus-4-6',
         cwd: '/test',
       });
 
@@ -313,7 +313,7 @@ describe('claude-provider.ts', () => {
 
       const generator = provider.executeQuery({
         prompt: 'Test',
-        model: 'claude-opus-4-5-20251101',
+        model: 'claude-opus-4-6',
         cwd: '/test',
       });
 
@@ -341,7 +341,7 @@ describe('claude-provider.ts', () => {
 
       const generator = provider.executeQuery({
         prompt: 'Test',
-        model: 'claude-opus-4-5-20251101',
+        model: 'claude-opus-4-6',
         cwd: '/test',
       });
 
@@ -366,12 +366,12 @@ describe('claude-provider.ts', () => {
       expect(models).toHaveLength(4);
     });
 
-    it('should include Claude Opus 4.5', () => {
+    it('should include Claude Opus 4.6', () => {
       const models = provider.getAvailableModels();
 
-      const opus = models.find((m) => m.id === 'claude-opus-4-5-20251101');
+      const opus = models.find((m) => m.id === 'claude-opus-4-6');
       expect(opus).toBeDefined();
-      expect(opus?.name).toBe('Claude Opus 4.5');
+      expect(opus?.name).toBe('Claude Opus 4.6');
       expect(opus?.provider).toBe('anthropic');
     });
 
@@ -400,7 +400,7 @@ describe('claude-provider.ts', () => {
     it('should mark Opus as default', () => {
       const models = provider.getAvailableModels();
 
-      const opus = models.find((m) => m.id === 'claude-opus-4-5-20251101');
+      const opus = models.find((m) => m.id === 'claude-opus-4-6');
       expect(opus?.default).toBe(true);
     });
 

apps/server/tests/unit/providers/provider-factory.test.ts

@@ -54,8 +54,8 @@ describe('provider-factory.ts', () => {
 
   describe('getProviderForModel', () => {
     describe('Claude models (claude-* prefix)', () => {
-      it('should return ClaudeProvider for claude-opus-4-5-20251101', () => {
-        const provider = ProviderFactory.getProviderForModel('claude-opus-4-5-20251101');
+      it('should return ClaudeProvider for claude-opus-4-6', () => {
+        const provider = ProviderFactory.getProviderForModel('claude-opus-4-6');
         expect(provider).toBeInstanceOf(ClaudeProvider);
       });
 
@@ -70,7 +70,7 @@ describe('provider-factory.ts', () => {
       });
 
       it('should be case-insensitive for claude models', () => {
-        const provider = ProviderFactory.getProviderForModel('CLAUDE-OPUS-4-5-20251101');
+        const provider = ProviderFactory.getProviderForModel('CLAUDE-OPUS-4-6');
         expect(provider).toBeInstanceOf(ClaudeProvider);
       });
     });

apps/ui/docs/AGENT_ARCHITECTURE.md

@@ -199,7 +199,7 @@ The agent is configured with:
 
 ```javascript
 {
-  model: "claude-opus-4-5-20251101",
+  model: "claude-opus-4-6",
   maxTurns: 20,
   cwd: workingDirectory,
   allowedTools: [

apps/ui/src/components/views/board-view/dialogs/add-feature-dialog.tsx

@@ -264,7 +264,21 @@ export function AddFeatureDialog({
   }, [planningMode]);
 
   const handleModelChange = (entry: PhaseModelEntry) => {
-    setModelEntry(entry);
+    // Normalize thinking level when switching between adaptive and non-adaptive models
+    const isNewModelAdaptive =
+      entry.model === 'claude-opus' ||
+      (typeof entry.model === 'string' && entry.model.includes('opus-4-6'));
+    const currentLevel = entry.thinkingLevel || 'none';
+
+    if (isNewModelAdaptive && currentLevel !== 'none' && currentLevel !== 'adaptive') {
+      // Switching TO Opus 4.6 with a manual level -> auto-switch to 'adaptive'
+      setModelEntry({ ...entry, thinkingLevel: 'adaptive' });
+    } else if (!isNewModelAdaptive && currentLevel === 'adaptive') {
+      // Switching FROM Opus 4.6 with adaptive -> auto-switch to 'high'
+      setModelEntry({ ...entry, thinkingLevel: 'high' });
+    } else {
+      setModelEntry(entry);
+    }
   };
 
   const buildFeatureData = (): FeatureData | null => {

apps/ui/src/components/views/board-view/shared/model-constants.ts

@@ -167,7 +167,14 @@ export const ALL_MODELS: ModelOption[] = [
   ...COPILOT_MODELS,
 ];
 
-export const THINKING_LEVELS: ThinkingLevel[] = ['none', 'low', 'medium', 'high', 'ultrathink'];
+export const THINKING_LEVELS: ThinkingLevel[] = [
+  'none',
+  'low',
+  'medium',
+  'high',
+  'ultrathink',
+  'adaptive',
+];
 
 export const THINKING_LEVEL_LABELS: Record<ThinkingLevel, string> = {
   none: 'None',
@@ -175,6 +182,7 @@ export const THINKING_LEVEL_LABELS: Record<ThinkingLevel, string> = {
   medium: 'Med',
   high: 'High',
   ultrathink: 'Ultra',
+  adaptive: 'Adaptive',
 };
 
 /**

apps/ui/src/components/views/board-view/shared/thinking-level-selector.tsx

@@ -2,19 +2,25 @@ import { Label } from '@/components/ui/label';
 import { Brain } from 'lucide-react';
 import { cn } from '@/lib/utils';
 import { ThinkingLevel } from '@/store/app-store';
-import { THINKING_LEVELS, THINKING_LEVEL_LABELS } from './model-constants';
+import { THINKING_LEVEL_LABELS } from './model-constants';
+import { getThinkingLevelsForModel } from '@automaker/types';
 
 interface ThinkingLevelSelectorProps {
   selectedLevel: ThinkingLevel;
   onLevelSelect: (level: ThinkingLevel) => void;
   testIdPrefix?: string;
+  /** Optional model ID to filter available thinking levels (e.g., Opus 4.6 only shows None/Adaptive) */
+  model?: string;
 }
 
 export function ThinkingLevelSelector({
   selectedLevel,
   onLevelSelect,
   testIdPrefix = 'thinking-level',
+  model,
 }: ThinkingLevelSelectorProps) {
+  const levels = model ? getThinkingLevelsForModel(model) : getThinkingLevelsForModel('');
+
   return (
     <div className="space-y-2 pt-2 border-t border-border">
       <Label className="flex items-center gap-2 text-sm">
@@ -22,7 +28,7 @@ export function ThinkingLevelSelector({
         Thinking Level
       </Label>
       <div className="flex gap-2 flex-wrap">
-        {THINKING_LEVELS.map((level) => (
+        {levels.map((level) => (
           <button
             key={level}
             type="button"
@@ -40,7 +46,9 @@ export function ThinkingLevelSelector({
         ))}
       </div>
       <p className="text-xs text-muted-foreground">
-        Higher levels give more time to reason through complex problems.
+        {model && getThinkingLevelsForModel(model).includes('adaptive')
+          ? 'Adaptive thinking lets the model decide how much reasoning to use.'
+          : 'Higher levels give more time to reason through complex problems.'}
       </p>
     </div>
   );

apps/ui/src/components/views/settings-view/model-defaults/phase-model-selector.tsx

@@ -21,6 +21,7 @@ import {
   isGroupSelected,
   getSelectedVariant,
   codexModelHasThinking,
+  getThinkingLevelsForModel,
 } from '@automaker/types';
 import {
   CLAUDE_MODELS,
@@ -28,7 +29,6 @@ import {
   OPENCODE_MODELS,
   GEMINI_MODELS,
   COPILOT_MODELS,
-  THINKING_LEVELS,
   THINKING_LEVEL_LABELS,
   REASONING_EFFORT_LEVELS,
   REASONING_EFFORT_LABELS,
@@ -1296,7 +1296,9 @@ export function PhaseModelSelector({
               <div className="px-2 py-1 text-xs font-medium text-muted-foreground">
                 Thinking Level
               </div>
-              {THINKING_LEVELS.map((level) => (
+              {getThinkingLevelsForModel(
+                model.mapsToClaudeModel === 'opus' ? 'claude-opus' : ''
+              ).map((level) => (
                 <button
                   key={level}
                   onClick={() => {
@@ -1322,6 +1324,7 @@ export function PhaseModelSelector({
                       {level === 'medium' && 'Moderate reasoning (10k tokens)'}
                       {level === 'high' && 'Deep reasoning (16k tokens)'}
                       {level === 'ultrathink' && 'Maximum reasoning (32k tokens)'}
+                      {level === 'adaptive' && 'Model decides reasoning depth'}
                     </span>
                   </div>
                   {isSelected && currentThinking === level && (
@@ -1402,7 +1405,9 @@ export function PhaseModelSelector({
               <div className="px-2 py-1.5 text-xs font-medium text-muted-foreground border-b border-border/50 mb-1">
                 Thinking Level
               </div>
-              {THINKING_LEVELS.map((level) => (
+              {getThinkingLevelsForModel(
+                model.mapsToClaudeModel === 'opus' ? 'claude-opus' : ''
+              ).map((level) => (
                 <button
                   key={level}
                   onClick={() => {
@@ -1428,6 +1433,7 @@ export function PhaseModelSelector({
                       {level === 'medium' && 'Moderate reasoning (10k tokens)'}
                       {level === 'high' && 'Deep reasoning (16k tokens)'}
                       {level === 'ultrathink' && 'Maximum reasoning (32k tokens)'}
+                      {level === 'adaptive' && 'Model decides reasoning depth'}
                     </span>
                   </div>
                   {isSelected && currentThinking === level && (
@@ -1564,7 +1570,7 @@ export function PhaseModelSelector({
               <div className="px-2 py-1 text-xs font-medium text-muted-foreground">
                 Thinking Level
               </div>
-              {THINKING_LEVELS.map((level) => (
+              {getThinkingLevelsForModel(model.id).map((level) => (
                 <button
                   key={level}
                   onClick={() => {
@@ -1589,6 +1595,7 @@ export function PhaseModelSelector({
                       {level === 'medium' && 'Moderate reasoning (10k tokens)'}
                       {level === 'high' && 'Deep reasoning (16k tokens)'}
                       {level === 'ultrathink' && 'Maximum reasoning (32k tokens)'}
+                      {level === 'adaptive' && 'Model decides reasoning depth'}
                     </span>
                   </div>
                   {isSelected && currentThinking === level && (
@@ -1685,7 +1692,7 @@ export function PhaseModelSelector({
               <div className="px-2 py-1.5 text-xs font-medium text-muted-foreground border-b border-border/50 mb-1">
                 Thinking Level
               </div>
-              {THINKING_LEVELS.map((level) => (
+              {getThinkingLevelsForModel(model.id).map((level) => (
                 <button
                   key={level}
                   onClick={() => {
@@ -1710,6 +1717,7 @@ export function PhaseModelSelector({
                       {level === 'medium' && 'Moderate reasoning (10k tokens)'}
                       {level === 'high' && 'Deep reasoning (16k tokens)'}
                       {level === 'ultrathink' && 'Maximum reasoning (32k tokens)'}
+                      {level === 'adaptive' && 'Model decides reasoning depth'}
                     </span>
                   </div>
                   {isSelected && currentThinking === level && (

apps/ui/src/lib/agent-context-parser.ts

@@ -27,13 +27,14 @@ export interface AgentTaskInfo {
 /**
  * Default model used by the feature executor
  */
-export const DEFAULT_MODEL = 'claude-opus-4-5-20251101';
+export const DEFAULT_MODEL = 'claude-opus-4-6';
 
 /**
  * Formats a model name for display
  */
 export function formatModelName(model: string): string {
   // Claude models
+  if (model.includes('opus-4-6')) return 'Opus 4.6';
   if (model.includes('opus')) return 'Opus 4.5';
   if (model.includes('sonnet')) return 'Sonnet 4.5';
   if (model.includes('haiku')) return 'Haiku 4.5';