diff --git a/packages/types/src/providers/vertex.ts b/packages/types/src/providers/vertex.ts
index b1291d2f59..f82341ace1 100644
--- a/packages/types/src/providers/vertex.ts
+++ b/packages/types/src/providers/vertex.ts
@@ -292,7 +292,7 @@ export const vertexModels = {
 			},
 		],
 	},
-	"claude-sonnet-4-6@20260114": {
+	"claude-sonnet-4-6": {
 		maxTokens: 8192,
 		contextWindow: 200_000, // Default 200K, extendable to 1M with beta flag 'context-1m-2025-08-07'
 		supportsImages: true,
@@ -541,7 +541,7 @@ export const vertexModels = {
 export const VERTEX_1M_CONTEXT_MODEL_IDS = [
 	"claude-sonnet-4@20250514",
 	"claude-sonnet-4-5@20250929",
-	"claude-sonnet-4-6@20260114",
+	"claude-sonnet-4-6",
 	"claude-opus-4-6",
 ] as const
 
diff --git a/src/api/providers/__tests__/anthropic-vertex.spec.ts b/src/api/providers/__tests__/anthropic-vertex.spec.ts
index dc284ab754..f1ada38a63 100644
--- a/src/api/providers/__tests__/anthropic-vertex.spec.ts
+++ b/src/api/providers/__tests__/anthropic-vertex.spec.ts
@@ -901,7 +901,7 @@ describe("VertexHandler", () => {
 
 		it("should enable 1M context for Claude Sonnet 4.6 when beta flag is set", () => {
 			const handler = new AnthropicVertexHandler({
-				apiModelId: "claude-sonnet-4-6@20260114",
+				apiModelId: "claude-sonnet-4-6",
 				vertexProjectId: "test-project",
 				vertexRegion: "us-central1",
 				vertex1MContext: true,