feat: enable reasoning support for Grok models

Author: claude

packages/models/src/models/xai.ts

@@ -195,6 +195,8 @@ export const xaiModels = [
 				vision: true,
 				tools: true,
 				jsonOutput: true,
+				reasoning: true,
+				reasoningOutput: "omit",
 			},
 		],
 	},
@@ -259,6 +261,8 @@ export const xaiModels = [
 				vision: true,
 				tools: true,
 				jsonOutput: true,
+				reasoning: true,
+				reasoningOutput: "omit",
 			},
 		],
 	},