Add Gemini 3.1 Pro customtools model to Vertex AI provider (#11857)

Author: NVolcz

packages/types/src/providers/vertex.ts

@@ -35,6 +35,35 @@ export const vertexModels = {
 			},
 		],
 	},
+	"gemini-3.1-pro-preview-customtools": {
+		maxTokens: 65_536,
+		contextWindow: 1_048_576,
+		supportsImages: true,
+		supportsPromptCache: true,
+		supportsReasoningEffort: ["low", "medium", "high"],
+		reasoningEffort: "low",
+
+		supportsTemperature: true,
+		defaultTemperature: 1,
+		inputPrice: 4.0,
+		outputPrice: 18.0,
+		cacheReadsPrice: 0.4,
+		cacheWritesPrice: 4.5,
+		tiers: [
+			{
+				contextWindow: 200_000,
+				inputPrice: 2.0,
+				outputPrice: 12.0,
+				cacheReadsPrice: 0.2,
+			},
+			{
+				contextWindow: Infinity,
+				inputPrice: 4.0,
+				outputPrice: 18.0,
+				cacheReadsPrice: 0.4,
+			},
+		],
+	},
 	"gemini-3-pro-preview": {
 		maxTokens: 65_536,
 		contextWindow: 1_048_576,