feat(agent): add claude-fable-5 to 1M context window support

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

Author: ErlichLiu

apps/electron/src/main/lib/agent-orchestrator.ts

@@ -442,17 +442,18 @@ const DEFAULT_MODEL_ID = 'claude-sonnet-4-6'
 
 /**
  * 判断模型是否支持 1M context window beta（context-1m-2025-08-07）
- * 当前支持：Claude Sonnet 4 / 4.5 / 4.6、Opus 4.6 / 4.7 / 4.8、DeepSeek V4 系列、
+ * 当前支持：Claude Sonnet 4 / 4.5 / 4.6、Opus 4.6 / 4.7 / 4.8、Fable 5、DeepSeek V4 系列、
  * 小米 MiMo V2.5 / V2.5 Pro / V2 Pro
  * 参考：https://docs.anthropic.com/en/docs/build-with-claude/context-windows
  */
 function supports1MContext(modelId: string): boolean {
   const m = modelId.toLowerCase()
   if (m.includes('haiku')) return false
-  // Claude: Sonnet 4+ 与 Opus 4.6+ 都支持
+  // Claude: Sonnet 4+ 与 Opus 4.6+、Fable 5 都支持
   if (m.includes('claude')) {
     if (m.includes('sonnet-4')) return true
     if (m.includes('opus-4-6') || m.includes('opus-4-7') || m.includes('opus-4-8')) return true
+    if (m.includes('fable-5')) return true
     return false
   }
   // DeepSeek V4 系列（deepseek-v4-pro、deepseek-v4-flash）

apps/electron/src/renderer/hooks/useGlobalAgentListeners.ts

@@ -110,12 +110,13 @@ function inferContextWindow(model?: string): number | undefined {
   const m = model.toLowerCase()
   // Claude Haiku 为 200k
   if (m.includes('claude-haiku')) return 200_000
-  // Claude Sonnet 4.6、Opus 4.6 / 4.7 / 4.8、DeepSeek V4 系列均为 1M 上下文
+  // Claude Sonnet 4.6、Opus 4.6 / 4.7 / 4.8、Fable 5、DeepSeek V4 系列均为 1M 上下文
   if (
     m.includes('claude-sonnet-4-6') ||
     m.includes('claude-opus-4-6') ||
     m.includes('claude-opus-4-7') ||
-    m.includes('claude-opus-4-8')
+    m.includes('claude-opus-4-8') ||
+    m.includes('claude-fable-5')
   ) return 1_000_000
   if (m.includes('deepseek-v4')) return 1_000_000
   // MiniMax M3 为 1M 上下文