diff --git a/packages/types/src/provider-settings.ts b/packages/types/src/provider-settings.ts
index 024293ddafc..443cbafcf16 100644
--- a/packages/types/src/provider-settings.ts
+++ b/packages/types/src/provider-settings.ts
@@ -237,6 +237,7 @@ const vertexSchema = apiModelIdProviderModelSchema.extend({
 	vertexRegion: z.string().optional(),
 	enableUrlContext: z.boolean().optional(),
 	enableGrounding: z.boolean().optional(),
+	vertex1MContext: z.boolean().optional(), // Enable 'context-1m-2025-08-07' beta for 1M context window.
 })
 
 const openAiSchema = baseProviderSettingsSchema.extend({
diff --git a/packages/types/src/providers/vertex.ts b/packages/types/src/providers/vertex.ts
index 916d72afe06..cd247efb41a 100644
--- a/packages/types/src/providers/vertex.ts
+++ b/packages/types/src/providers/vertex.ts
@@ -275,29 +275,49 @@ export const vertexModels = {
 	},
 	"claude-sonnet-4@20250514": {
 		maxTokens: 8192,
-		contextWindow: 200_000,
+		contextWindow: 200_000, // Default 200K, extendable to 1M with beta flag 'context-1m-2025-08-07'
 		supportsImages: true,
 		supportsPromptCache: true,
 		supportsNativeTools: true,
 		defaultToolProtocol: "native",
-		inputPrice: 3.0,
-		outputPrice: 15.0,
-		cacheWritesPrice: 3.75,
-		cacheReadsPrice: 0.3,
+		inputPrice: 3.0, // $3 per million input tokens (≤200K context)
+		outputPrice: 15.0, // $15 per million output tokens (≤200K context)
+		cacheWritesPrice: 3.75, // $3.75 per million tokens
+		cacheReadsPrice: 0.3, // $0.30 per million tokens
 		supportsReasoningBudget: true,
+		// Tiered pricing for extended context (requires beta flag 'context-1m-2025-08-07')
+		tiers: [
+			{
+				contextWindow: 1_000_000, // 1M tokens with beta flag
+				inputPrice: 6.0, // $6 per million input tokens (>200K context)
+				outputPrice: 22.5, // $22.50 per million output tokens (>200K context)
+				cacheWritesPrice: 7.5, // $7.50 per million tokens (>200K context)
+				cacheReadsPrice: 0.6, // $0.60 per million tokens (>200K context)
+			},
+		],
 	},
 	"claude-sonnet-4-5@20250929": {
 		maxTokens: 8192,
-		contextWindow: 200_000,
+		contextWindow: 200_000, // Default 200K, extendable to 1M with beta flag 'context-1m-2025-08-07'
 		supportsImages: true,
 		supportsPromptCache: true,
 		supportsNativeTools: true,
 		defaultToolProtocol: "native",
-		inputPrice: 3.0,
-		outputPrice: 15.0,
-		cacheWritesPrice: 3.75,
-		cacheReadsPrice: 0.3,
+		inputPrice: 3.0, // $3 per million input tokens (≤200K context)
+		outputPrice: 15.0, // $15 per million output tokens (≤200K context)
+		cacheWritesPrice: 3.75, // $3.75 per million tokens
+		cacheReadsPrice: 0.3, // $0.30 per million tokens
 		supportsReasoningBudget: true,
+		// Tiered pricing for extended context (requires beta flag 'context-1m-2025-08-07')
+		tiers: [
+			{
+				contextWindow: 1_000_000, // 1M tokens with beta flag
+				inputPrice: 6.0, // $6 per million input tokens (>200K context)
+				outputPrice: 22.5, // $22.50 per million output tokens (>200K context)
+				cacheWritesPrice: 7.5, // $7.50 per million tokens (>200K context)
+				cacheReadsPrice: 0.6, // $0.60 per million tokens (>200K context)
+			},
+		],
 	},
 	"claude-haiku-4-5@20251001": {
 		maxTokens: 8192,
@@ -517,6 +537,10 @@ export const vertexModels = {
 	},
 } as const satisfies Record<string, ModelInfo>
 
+// Vertex AI models that support 1M context window beta
+// Uses the same beta header 'context-1m-2025-08-07' as Anthropic and Bedrock
+export const VERTEX_1M_CONTEXT_MODEL_IDS = ["claude-sonnet-4@20250514", "claude-sonnet-4-5@20250929"] as const
+
 export const VERTEX_REGIONS = [
 	{ value: "global", label: "global" },
 	{ value: "us-central1", label: "us-central1" },
diff --git a/src/api/providers/__tests__/anthropic-vertex.spec.ts b/src/api/providers/__tests__/anthropic-vertex.spec.ts
index a5e97ed6f3e..0746602d7ef 100644
--- a/src/api/providers/__tests__/anthropic-vertex.spec.ts
+++ b/src/api/providers/__tests__/anthropic-vertex.spec.ts
@@ -3,6 +3,8 @@
 import { Anthropic } from "@anthropic-ai/sdk"
 import { AnthropicVertex } from "@anthropic-ai/vertex-sdk"
 
+import { VERTEX_1M_CONTEXT_MODEL_IDS } from "@roo-code/types"
+
 import { ApiStreamChunk } from "../../transform/stream"
 
 import { AnthropicVertexHandler } from "../anthropic-vertex"
@@ -159,35 +161,39 @@ describe("VertexHandler", () => {
 				outputTokens: 5,
 			})
 
-			expect(mockCreate).toHaveBeenCalledWith({
-				model: "claude-3-5-sonnet-v2@20241022",
-				max_tokens: 8192,
-				temperature: 0,
-				system: [
-					{
-						type: "text",
-						text: "You are a helpful assistant",
-						cache_control: { type: "ephemeral" },
-					},
-				],
-				messages: [
-					{
-						role: "user",
-						content: [
-							{
-								type: "text",
-								text: "Hello",
-								cache_control: { type: "ephemeral" },
-							},
-						],
-					},
-					{
-						role: "assistant",
-						content: "Hi there!",
-					},
-				],
-				stream: true,
-			})
+			expect(mockCreate).toHaveBeenCalledWith(
+				{
+					model: "claude-3-5-sonnet-v2@20241022",
+					max_tokens: 8192,
+					temperature: 0,
+					thinking: undefined,
+					system: [
+						{
+							type: "text",
+							text: "You are a helpful assistant",
+							cache_control: { type: "ephemeral" },
+						},
+					],
+					messages: [
+						{
+							role: "user",
+							content: [
+								{
+									type: "text",
+									text: "Hello",
+									cache_control: { type: "ephemeral" },
+								},
+							],
+						},
+						{
+							role: "assistant",
+							content: "Hi there!",
+						},
+					],
+					stream: true,
+				},
+				undefined,
+			)
 		})
 
 		it("should handle multiple content blocks with line breaks for Claude", async () => {
@@ -401,6 +407,7 @@ describe("VertexHandler", () => {
 						}),
 					],
 				}),
+				undefined,
 			)
 		})
 
@@ -858,6 +865,162 @@ describe("VertexHandler", () => {
 			expect(result.reasoningBudget).toBeUndefined()
 			expect(result.temperature).toBe(0)
 		})
+
+		it("should enable 1M context for Claude Sonnet 4 when beta flag is set", () => {
+			const handler = new AnthropicVertexHandler({
+				apiModelId: VERTEX_1M_CONTEXT_MODEL_IDS[0],
+				vertexProjectId: "test-project",
+				vertexRegion: "us-central1",
+				vertex1MContext: true,
+			})
+
+			const model = handler.getModel()
+			expect(model.info.contextWindow).toBe(1_000_000)
+			expect(model.info.inputPrice).toBe(6.0)
+			expect(model.info.outputPrice).toBe(22.5)
+			expect(model.betas).toContain("context-1m-2025-08-07")
+		})
+
+		it("should enable 1M context for Claude Sonnet 4.5 when beta flag is set", () => {
+			const handler = new AnthropicVertexHandler({
+				apiModelId: VERTEX_1M_CONTEXT_MODEL_IDS[1],
+				vertexProjectId: "test-project",
+				vertexRegion: "us-central1",
+				vertex1MContext: true,
+			})
+
+			const model = handler.getModel()
+			expect(model.info.contextWindow).toBe(1_000_000)
+			expect(model.info.inputPrice).toBe(6.0)
+			expect(model.info.outputPrice).toBe(22.5)
+			expect(model.betas).toContain("context-1m-2025-08-07")
+		})
+
+		it("should not enable 1M context when flag is disabled", () => {
+			const handler = new AnthropicVertexHandler({
+				apiModelId: VERTEX_1M_CONTEXT_MODEL_IDS[0],
+				vertexProjectId: "test-project",
+				vertexRegion: "us-central1",
+				vertex1MContext: false,
+			})
+
+			const model = handler.getModel()
+			expect(model.info.contextWindow).toBe(200_000)
+			expect(model.info.inputPrice).toBe(3.0)
+			expect(model.info.outputPrice).toBe(15.0)
+			expect(model.betas).toBeUndefined()
+		})
+
+		it("should not enable 1M context for non-supported models even with flag", () => {
+			const handler = new AnthropicVertexHandler({
+				apiModelId: "claude-3-5-sonnet-v2@20241022",
+				vertexProjectId: "test-project",
+				vertexRegion: "us-central1",
+				vertex1MContext: true,
+			})
+
+			const model = handler.getModel()
+			expect(model.info.contextWindow).toBe(200_000)
+			expect(model.betas).toBeUndefined()
+		})
+	})
+
+	describe("1M context beta header", () => {
+		const mockMessages: Anthropic.Messages.MessageParam[] = [
+			{
+				role: "user",
+				content: "Hello",
+			},
+		]
+
+		const systemPrompt = "You are a helpful assistant"
+
+		it("should include anthropic-beta header when 1M context is enabled", async () => {
+			const handler = new AnthropicVertexHandler({
+				apiModelId: VERTEX_1M_CONTEXT_MODEL_IDS[0],
+				vertexProjectId: "test-project",
+				vertexRegion: "us-central1",
+				vertex1MContext: true,
+			})
+
+			const mockStream = [
+				{
+					type: "message_start",
+					message: {
+						usage: {
+							input_tokens: 10,
+							output_tokens: 0,
+						},
+					},
+				},
+			]
+
+			const asyncIterator = {
+				async *[Symbol.asyncIterator]() {
+					for (const chunk of mockStream) {
+						yield chunk
+					}
+				},
+			}
+
+			const mockCreate = vitest.fn().mockResolvedValue(asyncIterator)
+			;(handler["client"].messages as any).create = mockCreate
+
+			const stream = handler.createMessage(systemPrompt, mockMessages)
+
+			for await (const _chunk of stream) {
+				// Just consume
+			}
+
+			// Verify the API was called with the beta header
+			expect(mockCreate).toHaveBeenCalledWith(
+				expect.anything(),
+				expect.objectContaining({
+					headers: { "anthropic-beta": "context-1m-2025-08-07" },
+				}),
+			)
+		})
+
+		it("should not include anthropic-beta header when 1M context is disabled", async () => {
+			const handler = new AnthropicVertexHandler({
+				apiModelId: VERTEX_1M_CONTEXT_MODEL_IDS[0],
+				vertexProjectId: "test-project",
+				vertexRegion: "us-central1",
+				vertex1MContext: false,
+			})
+
+			const mockStream = [
+				{
+					type: "message_start",
+					message: {
+						usage: {
+							input_tokens: 10,
+							output_tokens: 0,
+						},
+					},
+				},
+			]
+
+			const asyncIterator = {
+				async *[Symbol.asyncIterator]() {
+					for (const chunk of mockStream) {
+						yield chunk
+					}
+				},
+			}
+
+			const mockCreate = vitest.fn().mockResolvedValue(asyncIterator)
+			;(handler["client"].messages as any).create = mockCreate
+
+			const stream = handler.createMessage(systemPrompt, mockMessages)
+
+			for await (const _chunk of stream) {
+				// Just consume
+			}
+
+			// Verify the API was called without the beta header
+			expect(mockCreate).toHaveBeenCalledWith(expect.anything(), undefined)
+		})
 	})
 
 	describe("thinking model configuration", () => {
@@ -946,6 +1109,7 @@ describe("VertexHandler", () => {
 					thinking: { type: "enabled", budget_tokens: 4096 },
 					temperature: 1.0, // Thinking requires temperature 1.0
 				}),
+				undefined,
 			)
 		})
 	})
@@ -1032,6 +1196,7 @@ describe("VertexHandler", () => {
 					]),
 					tool_choice: { type: "auto", disable_parallel_tool_use: true },
 				}),
+				undefined,
 			)
 		})
 
@@ -1080,6 +1245,7 @@ describe("VertexHandler", () => {
 				expect.not.objectContaining({
 					tools: expect.anything(),
 				}),
+				undefined,
 			)
 		})
 
diff --git a/src/api/providers/anthropic-vertex.ts b/src/api/providers/anthropic-vertex.ts
index 6d2d93f7f55..cbfae08f41e 100644
--- a/src/api/providers/anthropic-vertex.ts
+++ b/src/api/providers/anthropic-vertex.ts
@@ -9,6 +9,7 @@ import {
 	vertexModels,
 	ANTHROPIC_DEFAULT_MAX_TOKENS,
 	TOOL_PROTOCOL,
+	VERTEX_1M_CONTEXT_MODEL_IDS,
 } from "@roo-code/types"
 
 import { ApiHandlerOptions } from "../../shared/api"
@@ -69,7 +70,7 @@ export class AnthropicVertexHandler extends BaseProvider implements SingleComple
 		messages: Anthropic.Messages.MessageParam[],
 		metadata?: ApiHandlerCreateMessageMetadata,
 	): ApiStream {
-		let { id, info, temperature, maxTokens, reasoning: thinking } = this.getModel()
+		let { id, info, temperature, maxTokens, reasoning: thinking, betas } = this.getModel()
 
 		const { supportsPromptCache } = info
 
@@ -120,7 +121,10 @@ export class AnthropicVertexHandler extends BaseProvider implements SingleComple
 			...nativeToolParams,
 		}
 
-		const stream = await this.client.messages.create(params)
+		// and prompt caching
+		const requestOptions = betas?.length ? { headers: { "anthropic-beta": betas.join(",") } } : undefined
+
+		const stream = await this.client.messages.create(params, requestOptions)
 
 		for await (const chunk of stream) {
 			switch (chunk.type) {
@@ -218,14 +222,49 @@ export class AnthropicVertexHandler extends BaseProvider implements SingleComple
 	getModel() {
 		const modelId = this.options.apiModelId
 		let id = modelId && modelId in vertexModels ? (modelId as VertexModelId) : vertexDefaultModelId
-		const info: ModelInfo = vertexModels[id]
+		let info: ModelInfo = vertexModels[id]
+
+		// Check if 1M context beta should be enabled for supported models
+		const supports1MContext = VERTEX_1M_CONTEXT_MODEL_IDS.includes(
+			id as (typeof VERTEX_1M_CONTEXT_MODEL_IDS)[number],
+		)
+		const enable1MContext = supports1MContext && this.options.vertex1MContext
+
+		// If 1M context beta is enabled, update the model info with tier pricing
+		if (enable1MContext) {
+			const tier = info.tiers?.[0]
+			if (tier) {
+				info = {
+					...info,
+					contextWindow: tier.contextWindow,
+					inputPrice: tier.inputPrice,
+					outputPrice: tier.outputPrice,
+					cacheWritesPrice: tier.cacheWritesPrice,
+					cacheReadsPrice: tier.cacheReadsPrice,
+				}
+			}
+		}
+
 		const params = getModelParams({ format: "anthropic", modelId: id, model: info, settings: this.options })
 
+		// Build betas array for request headers
+		const betas: string[] = []
+
+		// Add 1M context beta flag if enabled for supported models
+		if (enable1MContext) {
+			betas.push("context-1m-2025-08-07")
+		}
+
 		// The `:thinking` suffix indicates that the model is a "Hybrid"
 		// reasoning model and that reasoning is required to be enabled.
 		// The actual model ID honored by Anthropic's API does not have this
 		// suffix.
-		return { id: id.endsWith(":thinking") ? id.replace(":thinking", "") : id, info, ...params }
+		return {
+			id: id.endsWith(":thinking") ? id.replace(":thinking", "") : id,
+			info,
+			betas: betas.length > 0 ? betas : undefined,
+			...params,
+		}
 	}
 
 	async completePrompt(prompt: string) {
diff --git a/webview-ui/src/components/settings/providers/Vertex.tsx b/webview-ui/src/components/settings/providers/Vertex.tsx
index 57e82bad42b..db1cb23dae1 100644
--- a/webview-ui/src/components/settings/providers/Vertex.tsx
+++ b/webview-ui/src/components/settings/providers/Vertex.tsx
@@ -2,7 +2,7 @@ import { useCallback } from "react"
 import { Checkbox } from "vscrui"
 import { VSCodeLink, VSCodeTextField } from "@vscode/webview-ui-toolkit/react"
 
-import { type ProviderSettings, VERTEX_REGIONS } from "@roo-code/types"
+import { type ProviderSettings, VERTEX_REGIONS, VERTEX_1M_CONTEXT_MODEL_IDS } from "@roo-code/types"
 
 import { useAppTranslation } from "@src/i18n/TranslationContext"
 import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from "@src/components/ui"
@@ -18,6 +18,13 @@ type VertexProps = {
 export const Vertex = ({ apiConfiguration, setApiConfigurationField, simplifySettings }: VertexProps) => {
 	const { t } = useAppTranslation()
 
+	// Check if the selected model supports 1M context (Claude Sonnet 4 / 4.5)
+	const supports1MContextBeta =
+		!!apiConfiguration?.apiModelId &&
+		VERTEX_1M_CONTEXT_MODEL_IDS.includes(
+			apiConfiguration.apiModelId as (typeof VERTEX_1M_CONTEXT_MODEL_IDS)[number],
+		)
+
 	const handleInputChange = useCallback(
 		<K extends keyof ProviderSettings, E>(
 			field: K,
@@ -94,6 +101,22 @@ export const Vertex = ({ apiConfiguration, setApiConfigurationField, simplifySet
 				</Select>
 			</div>
 
+			{supports1MContextBeta && (
+				<div>
+					<Checkbox
+						data-testid="checkbox-vertex-1m-context"
+						checked={apiConfiguration?.vertex1MContext ?? false}
+						onChange={(checked: boolean) => {
+							setApiConfigurationField("vertex1MContext", checked)
+						}}>
+						{t("settings:providers.vertex1MContextBetaLabel")}
+					</Checkbox>
+					<div className="text-sm text-vscode-descriptionForeground mt-1 ml-6">
+						{t("settings:providers.vertex1MContextBetaDescription")}
+					</div>
+				</div>
+			)}
+
 			{!simplifySettings && apiConfiguration.apiModelId?.startsWith("gemini") && (
 				<div className="mt-6">
 					<Checkbox
diff --git a/webview-ui/src/i18n/locales/ca/settings.json b/webview-ui/src/i18n/locales/ca/settings.json
index b3fc4abbde2..20b1e0d510f 100644
--- a/webview-ui/src/i18n/locales/ca/settings.json
+++ b/webview-ui/src/i18n/locales/ca/settings.json
@@ -301,6 +301,8 @@
 		"anthropic1MContextBetaDescription": "Amplia la finestra de context a 1 milió de tokens per a Claude Sonnet 4",
 		"awsBedrock1MContextBetaLabel": "Activa la finestra de context d'1M (Beta)",
 		"awsBedrock1MContextBetaDescription": "Amplia la finestra de context a 1 milió de tokens per a Claude Sonnet 4",
+		"vertex1MContextBetaLabel": "Activa la finestra de context d'1M (Beta)",
+		"vertex1MContextBetaDescription": "Amplia la finestra de context a 1 milió de tokens per a Claude Sonnet 4",
 		"basetenApiKey": "Clau API de Baseten",
 		"getBasetenApiKey": "Obtenir clau API de Baseten",
 		"cerebrasApiKey": "Clau API de Cerebras",
diff --git a/webview-ui/src/i18n/locales/de/settings.json b/webview-ui/src/i18n/locales/de/settings.json
index d4f24ef3578..d68f7e7d32a 100644
--- a/webview-ui/src/i18n/locales/de/settings.json
+++ b/webview-ui/src/i18n/locales/de/settings.json
@@ -303,6 +303,8 @@
 		"anthropic1MContextBetaDescription": "Erweitert das Kontextfenster für Claude Sonnet 4 auf 1 Million Token",
 		"awsBedrock1MContextBetaLabel": "1M Kontextfenster aktivieren (Beta)",
 		"awsBedrock1MContextBetaDescription": "Erweitert das Kontextfenster für Claude Sonnet 4 auf 1 Million Token",
+		"vertex1MContextBetaLabel": "1M Kontextfenster aktivieren (Beta)",
+		"vertex1MContextBetaDescription": "Erweitert das Kontextfenster für Claude Sonnet 4 auf 1 Million Token",
 		"basetenApiKey": "Baseten API-Schlüssel",
 		"getBasetenApiKey": "Baseten API-Schlüssel erhalten",
 		"cerebrasApiKey": "Cerebras API-Schlüssel",
diff --git a/webview-ui/src/i18n/locales/en/settings.json b/webview-ui/src/i18n/locales/en/settings.json
index 56488602b44..2396bded682 100644
--- a/webview-ui/src/i18n/locales/en/settings.json
+++ b/webview-ui/src/i18n/locales/en/settings.json
@@ -310,6 +310,8 @@
 		"anthropic1MContextBetaDescription": "Extends context window to 1 million tokens for Claude Sonnet 4",
 		"awsBedrock1MContextBetaLabel": "Enable 1M context window (Beta)",
 		"awsBedrock1MContextBetaDescription": "Extends context window to 1 million tokens for Claude Sonnet 4",
+		"vertex1MContextBetaLabel": "Enable 1M context window (Beta)",
+		"vertex1MContextBetaDescription": "Extends context window to 1 million tokens for Claude Sonnet 4",
 		"basetenApiKey": "Baseten API Key",
 		"getBasetenApiKey": "Get Baseten API Key",
 		"cerebrasApiKey": "Cerebras API Key",
diff --git a/webview-ui/src/i18n/locales/es/settings.json b/webview-ui/src/i18n/locales/es/settings.json
index a0a469082f8..6c03855056f 100644
--- a/webview-ui/src/i18n/locales/es/settings.json
+++ b/webview-ui/src/i18n/locales/es/settings.json
@@ -301,6 +301,8 @@
 		"anthropic1MContextBetaDescription": "Amplía la ventana de contexto a 1 millón de tokens para Claude Sonnet 4",
 		"awsBedrock1MContextBetaLabel": "Habilitar ventana de contexto de 1M (Beta)",
 		"awsBedrock1MContextBetaDescription": "Amplía la ventana de contexto a 1 millón de tokens para Claude Sonnet 4",
+		"vertex1MContextBetaLabel": "Habilitar ventana de contexto de 1M (Beta)",
+		"vertex1MContextBetaDescription": "Amplía la ventana de contexto a 1 millón de tokens para Claude Sonnet 4",
 		"basetenApiKey": "Clave API de Baseten",
 		"getBasetenApiKey": "Obtener clave API de Baseten",
 		"cerebrasApiKey": "Clave API de Cerebras",
diff --git a/webview-ui/src/i18n/locales/fr/settings.json b/webview-ui/src/i18n/locales/fr/settings.json
index 9ab97608380..9fb20036865 100644
--- a/webview-ui/src/i18n/locales/fr/settings.json
+++ b/webview-ui/src/i18n/locales/fr/settings.json
@@ -301,6 +301,8 @@
 		"anthropic1MContextBetaDescription": "Étend la fenêtre de contexte à 1 million de tokens pour Claude Sonnet 4",
 		"awsBedrock1MContextBetaLabel": "Activer la fenêtre de contexte de 1M (Bêta)",
 		"awsBedrock1MContextBetaDescription": "Étend la fenêtre de contexte à 1 million de tokens pour Claude Sonnet 4",
+		"vertex1MContextBetaLabel": "Activer la fenêtre de contexte de 1M (Bêta)",
+		"vertex1MContextBetaDescription": "Étend la fenêtre de contexte à 1 million de tokens pour Claude Sonnet 4",
 		"basetenApiKey": "Clé API Baseten",
 		"getBasetenApiKey": "Obtenir la clé API Baseten",
 		"cerebrasApiKey": "Clé API Cerebras",
diff --git a/webview-ui/src/i18n/locales/hi/settings.json b/webview-ui/src/i18n/locales/hi/settings.json
index dedfe93a120..ee4f55d243a 100644
--- a/webview-ui/src/i18n/locales/hi/settings.json
+++ b/webview-ui/src/i18n/locales/hi/settings.json
@@ -301,6 +301,8 @@
 		"anthropic1MContextBetaDescription": "Claude Sonnet 4 के लिए संदर्भ विंडो को 1 मिलियन टोकन तक बढ़ाता है",
 		"awsBedrock1MContextBetaLabel": "1M संदर्भ विंडो सक्षम करें (बीटा)",
 		"awsBedrock1MContextBetaDescription": "Claude Sonnet 4 के लिए संदर्भ विंडो को 1 मिलियन टोकन तक बढ़ाता है",
+		"vertex1MContextBetaLabel": "1M संदर्भ विंडो सक्षम करें (बीटा)",
+		"vertex1MContextBetaDescription": "Claude Sonnet 4 के लिए संदर्भ विंडो को 1 मिलियन टोकन तक बढ़ाता है",
 		"basetenApiKey": "Baseten API कुंजी",
 		"getBasetenApiKey": "Baseten API कुंजी प्राप्त करें",
 		"cerebrasApiKey": "Cerebras API कुंजी",
diff --git a/webview-ui/src/i18n/locales/id/settings.json b/webview-ui/src/i18n/locales/id/settings.json
index f3bcd03d890..79bf7ba7bff 100644
--- a/webview-ui/src/i18n/locales/id/settings.json
+++ b/webview-ui/src/i18n/locales/id/settings.json
@@ -305,6 +305,8 @@
 		"anthropic1MContextBetaDescription": "Memperluas jendela konteks menjadi 1 juta token untuk Claude Sonnet 4",
 		"awsBedrock1MContextBetaLabel": "Aktifkan jendela konteks 1M (Beta)",
 		"awsBedrock1MContextBetaDescription": "Memperluas jendela konteks menjadi 1 juta token untuk Claude Sonnet 4",
+		"vertex1MContextBetaLabel": "Aktifkan jendela konteks 1M (Beta)",
+		"vertex1MContextBetaDescription": "Memperluas jendela konteks menjadi 1 juta token untuk Claude Sonnet 4",
 		"basetenApiKey": "Baseten API Key",
 		"getBasetenApiKey": "Dapatkan Baseten API Key",
 		"cerebrasApiKey": "Cerebras API Key",
diff --git a/webview-ui/src/i18n/locales/it/settings.json b/webview-ui/src/i18n/locales/it/settings.json
index fb9b07d6b83..a7db28f7513 100644
--- a/webview-ui/src/i18n/locales/it/settings.json
+++ b/webview-ui/src/i18n/locales/it/settings.json
@@ -301,6 +301,8 @@
 		"anthropic1MContextBetaDescription": "Estende la finestra di contesto a 1 milione di token per Claude Sonnet 4",
 		"awsBedrock1MContextBetaLabel": "Abilita finestra di contesto da 1M (Beta)",
 		"awsBedrock1MContextBetaDescription": "Estende la finestra di contesto a 1 milione di token per Claude Sonnet 4",
+		"vertex1MContextBetaLabel": "Abilita finestra di contesto da 1M (Beta)",
+		"vertex1MContextBetaDescription": "Estende la finestra di contesto a 1 milione di token per Claude Sonnet 4",
 		"basetenApiKey": "Chiave API Baseten",
 		"getBasetenApiKey": "Ottieni chiave API Baseten",
 		"cerebrasApiKey": "Chiave API Cerebras",
diff --git a/webview-ui/src/i18n/locales/ja/settings.json b/webview-ui/src/i18n/locales/ja/settings.json
index 1240a91c21f..b80892cd111 100644
--- a/webview-ui/src/i18n/locales/ja/settings.json
+++ b/webview-ui/src/i18n/locales/ja/settings.json
@@ -301,6 +301,8 @@
 		"anthropic1MContextBetaDescription": "Claude Sonnet 4のコンテキストウィンドウを100万トークンに拡張します",
 		"awsBedrock1MContextBetaLabel": "1Mコンテキストウィンドウを有効にする（ベータ版）",
 		"awsBedrock1MContextBetaDescription": "Claude Sonnet 4のコンテキストウィンドウを100万トークンに拡張します",
+		"vertex1MContextBetaLabel": "1Mコンテキストウィンドウを有効にする（ベータ版）",
+		"vertex1MContextBetaDescription": "Claude Sonnet 4のコンテキストウィンドウを100万トークンに拡張します",
 		"basetenApiKey": "Baseten APIキー",
 		"getBasetenApiKey": "Baseten APIキーを取得",
 		"cerebrasApiKey": "Cerebras APIキー",
diff --git a/webview-ui/src/i18n/locales/ko/settings.json b/webview-ui/src/i18n/locales/ko/settings.json
index 228af37219f..85ab220dfea 100644
--- a/webview-ui/src/i18n/locales/ko/settings.json
+++ b/webview-ui/src/i18n/locales/ko/settings.json
@@ -301,6 +301,8 @@
 		"anthropic1MContextBetaDescription": "Claude Sonnet 4의 컨텍스트 창을 100만 토큰으로 확장",
 		"awsBedrock1MContextBetaLabel": "1M 컨텍스트 창 활성화 (베타)",
 		"awsBedrock1MContextBetaDescription": "Claude Sonnet 4의 컨텍스트 창을 100만 토큰으로 확장",
+		"vertex1MContextBetaLabel": "1M 컨텍스트 창 활성화 (베타)",
+		"vertex1MContextBetaDescription": "Claude Sonnet 4의 컨텍스트 창을 100만 토큰으로 확장",
 		"basetenApiKey": "Baseten API 키",
 		"getBasetenApiKey": "Baseten API 키 가져오기",
 		"cerebrasApiKey": "Cerebras API 키",
diff --git a/webview-ui/src/i18n/locales/nl/settings.json b/webview-ui/src/i18n/locales/nl/settings.json
index 0948f3d6ad9..be2f2233628 100644
--- a/webview-ui/src/i18n/locales/nl/settings.json
+++ b/webview-ui/src/i18n/locales/nl/settings.json
@@ -301,6 +301,8 @@
 		"anthropic1MContextBetaDescription": "Breidt het contextvenster uit tot 1 miljoen tokens voor Claude Sonnet 4",
 		"awsBedrock1MContextBetaLabel": "1M contextvenster inschakelen (bèta)",
 		"awsBedrock1MContextBetaDescription": "Breidt het contextvenster uit tot 1 miljoen tokens voor Claude Sonnet 4",
+		"vertex1MContextBetaLabel": "1M contextvenster inschakelen (bèta)",
+		"vertex1MContextBetaDescription": "Breidt het contextvenster uit tot 1 miljoen tokens voor Claude Sonnet 4",
 		"basetenApiKey": "Baseten API-sleutel",
 		"getBasetenApiKey": "Baseten API-sleutel verkrijgen",
 		"cerebrasApiKey": "Cerebras API-sleutel",
diff --git a/webview-ui/src/i18n/locales/pl/settings.json b/webview-ui/src/i18n/locales/pl/settings.json
index 7123749061e..137bdabf3aa 100644
--- a/webview-ui/src/i18n/locales/pl/settings.json
+++ b/webview-ui/src/i18n/locales/pl/settings.json
@@ -301,6 +301,8 @@
 		"anthropic1MContextBetaDescription": "Rozszerza okno kontekstowe do 1 miliona tokenów dla Claude Sonnet 4",
 		"awsBedrock1MContextBetaLabel": "Włącz okno kontekstowe 1M (Beta)",
 		"awsBedrock1MContextBetaDescription": "Rozszerza okno kontekstowe do 1 miliona tokenów dla Claude Sonnet 4",
+		"vertex1MContextBetaLabel": "Włącz okno kontekstowe 1M (Beta)",
+		"vertex1MContextBetaDescription": "Rozszerza okno kontekstowe do 1 miliona tokenów dla Claude Sonnet 4",
 		"basetenApiKey": "Klucz API Baseten",
 		"getBasetenApiKey": "Uzyskaj klucz API Baseten",
 		"cerebrasApiKey": "Klucz API Cerebras",
diff --git a/webview-ui/src/i18n/locales/pt-BR/settings.json b/webview-ui/src/i18n/locales/pt-BR/settings.json
index 5c7c9fcc25d..ea459ffdeb0 100644
--- a/webview-ui/src/i18n/locales/pt-BR/settings.json
+++ b/webview-ui/src/i18n/locales/pt-BR/settings.json
@@ -301,6 +301,8 @@
 		"anthropic1MContextBetaDescription": "Estende a janela de contexto para 1 milhão de tokens para o Claude Sonnet 4",
 		"awsBedrock1MContextBetaLabel": "Ativar janela de contexto de 1M (Beta)",
 		"awsBedrock1MContextBetaDescription": "Estende a janela de contexto para 1 milhão de tokens para o Claude Sonnet 4",
+		"vertex1MContextBetaLabel": "Ativar janela de contexto de 1M (Beta)",
+		"vertex1MContextBetaDescription": "Estende a janela de contexto para 1 milhão de tokens para o Claude Sonnet 4",
 		"basetenApiKey": "Chave de API Baseten",
 		"getBasetenApiKey": "Obter chave de API Baseten",
 		"cerebrasApiKey": "Chave de API Cerebras",
diff --git a/webview-ui/src/i18n/locales/ru/settings.json b/webview-ui/src/i18n/locales/ru/settings.json
index bad0a234b3d..57560a9d33b 100644
--- a/webview-ui/src/i18n/locales/ru/settings.json
+++ b/webview-ui/src/i18n/locales/ru/settings.json
@@ -301,6 +301,8 @@
 		"anthropic1MContextBetaDescription": "Расширяет контекстное окно до 1 миллиона токенов для Claude Sonnet 4",
 		"awsBedrock1MContextBetaLabel": "Включить контекстное окно 1M (бета)",
 		"awsBedrock1MContextBetaDescription": "Расширяет контекстное окно до 1 миллиона токенов для Claude Sonnet 4",
+		"vertex1MContextBetaLabel": "Включить контекстное окно 1M (бета)",
+		"vertex1MContextBetaDescription": "Расширяет контекстное окно до 1 миллиона токенов для Claude Sonnet 4",
 		"basetenApiKey": "Baseten API-ключ",
 		"getBasetenApiKey": "Получить Baseten API-ключ",
 		"cerebrasApiKey": "Cerebras API-ключ",
diff --git a/webview-ui/src/i18n/locales/tr/settings.json b/webview-ui/src/i18n/locales/tr/settings.json
index 262e92948d2..bb2b1d38432 100644
--- a/webview-ui/src/i18n/locales/tr/settings.json
+++ b/webview-ui/src/i18n/locales/tr/settings.json
@@ -301,6 +301,8 @@
 		"anthropic1MContextBetaDescription": "Claude Sonnet 4 için bağlam penceresini 1 milyon token'a genişletir",
 		"awsBedrock1MContextBetaLabel": "1M bağlam penceresini etkinleştir (Beta)",
 		"awsBedrock1MContextBetaDescription": "Claude Sonnet 4 için bağlam penceresini 1 milyon token'a genişletir",
+		"vertex1MContextBetaLabel": "1M bağlam penceresini etkinleştir (Beta)",
+		"vertex1MContextBetaDescription": "Claude Sonnet 4 için bağlam penceresini 1 milyon token'a genişletir",
 		"basetenApiKey": "Baseten API Anahtarı",
 		"getBasetenApiKey": "Baseten API Anahtarı Al",
 		"cerebrasApiKey": "Cerebras API Anahtarı",
diff --git a/webview-ui/src/i18n/locales/vi/settings.json b/webview-ui/src/i18n/locales/vi/settings.json
index edb4b089134..8425d8d6ef5 100644
--- a/webview-ui/src/i18n/locales/vi/settings.json
+++ b/webview-ui/src/i18n/locales/vi/settings.json
@@ -301,6 +301,8 @@
 		"anthropic1MContextBetaDescription": "Mở rộng cửa sổ ngữ cảnh lên 1 triệu token cho Claude Sonnet 4",
 		"awsBedrock1MContextBetaLabel": "Bật cửa sổ ngữ cảnh 1M (Beta)",
 		"awsBedrock1MContextBetaDescription": "Mở rộng cửa sổ ngữ cảnh lên 1 triệu token cho Claude Sonnet 4",
+		"vertex1MContextBetaLabel": "Bật cửa sổ ngữ cảnh 1M (Beta)",
+		"vertex1MContextBetaDescription": "Mở rộng cửa sổ ngữ cảnh lên 1 triệu token cho Claude Sonnet 4",
 		"basetenApiKey": "Khóa API Baseten",
 		"getBasetenApiKey": "Lấy khóa API Baseten",
 		"cerebrasApiKey": "Khóa API Cerebras",
diff --git a/webview-ui/src/i18n/locales/zh-CN/settings.json b/webview-ui/src/i18n/locales/zh-CN/settings.json
index 269ef2fd204..327eb9f8c76 100644
--- a/webview-ui/src/i18n/locales/zh-CN/settings.json
+++ b/webview-ui/src/i18n/locales/zh-CN/settings.json
@@ -301,6 +301,8 @@
 		"anthropic1MContextBetaDescription": "为 Claude Sonnet 4 将上下文窗口扩展至 100 万个 token",
 		"awsBedrock1MContextBetaLabel": "启用 1M 上下文窗口 (Beta)",
 		"awsBedrock1MContextBetaDescription": "为 Claude Sonnet 4 将上下文窗口扩展至 100 万个 token",
+		"vertex1MContextBetaLabel": "启用 1M 上下文窗口 (Beta)",
+		"vertex1MContextBetaDescription": "为 Claude Sonnet 4 将上下文窗口扩展至 100 万个 token",
 		"basetenApiKey": "Baseten API 密钥",
 		"getBasetenApiKey": "获取 Baseten API 密钥",
 		"cerebrasApiKey": "Cerebras API 密钥",
diff --git a/webview-ui/src/i18n/locales/zh-TW/settings.json b/webview-ui/src/i18n/locales/zh-TW/settings.json
index 0ac1c7083c2..4967a7d6791 100644
--- a/webview-ui/src/i18n/locales/zh-TW/settings.json
+++ b/webview-ui/src/i18n/locales/zh-TW/settings.json
@@ -301,6 +301,8 @@
 		"anthropic1MContextBetaDescription": "為 Claude Sonnet 4 將上下文視窗擴展至 100 萬個 token",
 		"awsBedrock1MContextBetaLabel": "啟用 1M 上下文視窗 (Beta)",
 		"awsBedrock1MContextBetaDescription": "為 Claude Sonnet 4 將上下文視窗擴展至 100 萬個 token",
+		"vertex1MContextBetaLabel": "啟用 1M 上下文視窗 (Beta)",
+		"vertex1MContextBetaDescription": "為 Claude Sonnet 4 將上下文視窗擴展至 100 萬個 token",
 		"basetenApiKey": "Baseten API 金鑰",
 		"getBasetenApiKey": "取得 Baseten API 金鑰",
 		"cerebrasApiKey": "Cerebras API 金鑰",