diff --git a/packages/types/src/providers/vertex.ts b/packages/types/src/providers/vertex.ts
index f03d0b5805..bdef22a6a1 100644
--- a/packages/types/src/providers/vertex.ts
+++ b/packages/types/src/providers/vertex.ts
@@ -165,7 +165,7 @@ export const vertexModels = {
 	},
 	"claude-sonnet-4@20250514": {
 		maxTokens: 8192,
-		contextWindow: 200_000,
+		contextWindow: 1_000_000,
 		supportsImages: true,
 		supportsComputerUse: true,
 		supportsPromptCache: true,
@@ -177,7 +177,7 @@ export const vertexModels = {
 	},
 	"claude-sonnet-4-5@20250929": {
 		maxTokens: 8192,
-		contextWindow: 200_000,
+		contextWindow: 1_000_000,
 		supportsImages: true,
 		supportsComputerUse: true,
 		supportsPromptCache: true,