feat: add Grok 4.1 model support (#1185)

Co-authored-by: Claude <[email protected]>

Author: steebchen

packages/models/src/models/xai.ts

@@ -241,4 +241,46 @@ export const xaiModels = [
 			},
 		],
 	},
+	{
+		id: "grok-4-1-fast-reasoning",
+		name: "Grok 4.1 Fast Reasoning",
+		family: "xai",
+		providers: [
+			{
+				providerId: "xai",
+				modelName: "grok-4-1-fast-reasoning",
+				inputPrice: 3.0 / 1e6,
+				outputPrice: 15.0 / 1e6,
+				requestPrice: 0,
+				imageInputPrice: undefined,
+				contextSize: 256000,
+				maxOutput: undefined,
+				streaming: true,
+				vision: true,
+				tools: true,
+				jsonOutput: true,
+			},
+		],
+	},
+	{
+		id: "grok-4-1-fast-non-reasoning",
+		name: "Grok 4.1 Fast Non-Reasoning",
+		family: "xai",
+		providers: [
+			{
+				providerId: "xai",
+				modelName: "grok-4-1-fast-non-reasoning",
+				inputPrice: 3.0 / 1e6,
+				outputPrice: 15.0 / 1e6,
+				requestPrice: 0,
+				imageInputPrice: undefined,
+				contextSize: 2_000_000,
+				maxOutput: undefined,
+				streaming: true,
+				vision: true,
+				tools: true,
+				jsonOutput: true,
+			},
+		],
+	},
 ] as const satisfies ModelDefinition[];