From 0e56afc76413a3539bedcab1631e2c01ebc76875 Mon Sep 17 00:00:00 2001
From: Niklas Volcz <niklas.volcz@gmail.com>
Date: Thu, 5 Mar 2026 23:21:12 +0100
Subject: [PATCH] Add Gemini 3.1 Pro customtools model to Vertex AI provider
 (#11857)

---
 packages/types/src/providers/vertex.ts | 29 ++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/packages/types/src/providers/vertex.ts b/packages/types/src/providers/vertex.ts
index f82341ace1..033c6b2e0d 100644
--- a/packages/types/src/providers/vertex.ts
+++ b/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,