fix: use correct Claude API model IDs (without date suffix)

The official API model IDs are 'claude-opus-4-6' and 'claude-sonnet-4-6'
without date suffixes. The previous '-20260301' suffix caused model not
found errors. Verified working with actual Claude Agent SDK query.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: Ethan Park

lib/constants/claudeModels.ts

@@ -1,6 +1,6 @@
 export type ClaudeModelId =
-  | 'claude-opus-4-6-20260301'
-  | 'claude-sonnet-4-6-20260301'
+  | 'claude-opus-4-6'
+  | 'claude-sonnet-4-6'
   | 'claude-haiku-4-5-20251001';
 
 export interface ClaudeModelDefinition {
@@ -17,22 +17,23 @@ export interface ClaudeModelDefinition {
 
 export const CLAUDE_MODEL_DEFINITIONS: ClaudeModelDefinition[] = [
   {
-    id: 'claude-opus-4-6-20260301',
+    id: 'claude-opus-4-6',
     name: 'Claude Opus 4.6',
-    description: 'Newest Opus release with the strongest reasoning skills',
+    description: 'The most intelligent model for building agents and coding',
     supportsImages: true,
     aliases: [
-      'claude-opus-4-6-20260301',
       'claude-opus-4-6',
       'claude-opus-4.6',
       'claude-opus-4',
       'claude-opus',
-      'opus-4-6-20260301',
       'opus-4-6',
       'opus-4.6',
       'opus-4',
       'opus',
       // Legacy aliases
+      'claude-opus-4-5-20251101',
+      'claude-opus-4-5',
+      'claude-opus-4.5',
       'claude-opus-4-1-20250805',
       'claude-opus-4-1',
       'claude-opus-4.1',
@@ -42,17 +43,15 @@ export const CLAUDE_MODEL_DEFINITIONS: ClaudeModelDefinition[] = [
     ],
   },
   {
-    id: 'claude-sonnet-4-6-20260301',
+    id: 'claude-sonnet-4-6',
     name: 'Claude Sonnet 4.6',
-    description: 'Balanced Sonnet tier with a large context window',
+    description: 'The best combination of speed and intelligence',
     supportsImages: true,
     aliases: [
-      'claude-sonnet-4-6-20260301',
       'claude-sonnet-4-6',
       'claude-sonnet-4.6',
       'claude-sonnet-4',
       'claude-sonnet',
-      'sonnet-4-6-20260301',
       'sonnet-4-6',
       'sonnet-4.6',
       'sonnet-4',
@@ -70,7 +69,7 @@ export const CLAUDE_MODEL_DEFINITIONS: ClaudeModelDefinition[] = [
   {
     id: 'claude-haiku-4-5-20251001',
     name: 'Claude Haiku 4.5',
-    description: 'Fastest Haiku tier for lightweight tasks',
+    description: 'The fastest model with near-frontier intelligence',
     supportsImages: true,
     aliases: [
       'claude-haiku-4-5-20251001',
@@ -91,7 +90,7 @@ export const CLAUDE_MODEL_DEFINITIONS: ClaudeModelDefinition[] = [
   },
 ];
 
-export const CLAUDE_DEFAULT_MODEL: ClaudeModelId = 'claude-sonnet-4-6-20260301';
+export const CLAUDE_DEFAULT_MODEL: ClaudeModelId = 'claude-sonnet-4-6';
 
 const CLAUDE_MODEL_ALIAS_MAP: Record<string, ClaudeModelId> = CLAUDE_MODEL_DEFINITIONS.reduce(
   (map, definition) => {

lib/services/cli/claude.ts

@@ -556,7 +556,7 @@ function resolveModelId(model?: string | null): string {
  * @param projectId - Project ID
  * @param projectPath - Project directory path
  * @param instruction - Command to pass to AI
- * @param model - Claude model to use (default: claude-sonnet-4-6-20260301)
+ * @param model - Claude model to use (default: claude-sonnet-4-6)
  * @param sessionId - Previous session ID (maintains conversation context)
  * @param requestId - (Optional) User request tracking ID
  */
@@ -1150,7 +1150,7 @@ export async function executeClaude(
  * @param projectId - Project ID
  * @param projectPath - Project directory path
  * @param initialPrompt - Initial prompt
- * @param model - Claude model to use (default: claude-sonnet-4-6-20260301)
+ * @param model - Claude model to use (default: claude-sonnet-4-6)
  * @param requestId - (Optional) User request tracking ID
  */
 export async function initializeNextJsProject(
@@ -1180,7 +1180,7 @@ Set up the basic project structure and implement the requested features.
  * @param projectId - Project ID
  * @param projectPath - Project directory path
  * @param instruction - Change request command
- * @param model - Claude model to use (default: claude-sonnet-4-6-20260301)
+ * @param model - Claude model to use (default: claude-sonnet-4-6)
  * @param sessionId - Session ID
  * @param requestId - (Optional) User request tracking ID
  */

prisma/schema.prisma

@@ -37,7 +37,7 @@ model Project {
 
   // CLI Preferences
   preferredCli  String? @map("preferred_cli") // claude, cursor, codex, gemini, qwen
-  selectedModel String? @map("selected_model") // claude model id (claude-opus-4-6-20260301 | claude-sonnet-4-6-20260301 | claude-haiku-4-5-20251001)
+  selectedModel String? @map("selected_model") // claude model id (claude-opus-4-6 | claude-sonnet-4-6 | claude-haiku-4-5-20251001)
   fallbackEnabled Boolean @default(false) @map("fallback_enabled")
 
   // Settings (JSON)