diff --git a/packages/types/src/provider-settings.ts b/packages/types/src/provider-settings.ts
index 0c5965f7ff6..f30634e5f10 100644
--- a/packages/types/src/provider-settings.ts
+++ b/packages/types/src/provider-settings.ts
@@ -367,6 +367,7 @@ const litellmSchema = baseProviderSettingsSchema.extend({
 	litellmApiKey: z.string().optional(),
 	litellmModelId: z.string().optional(),
 	litellmUsePromptCache: z.boolean().optional(),
+	litellmFlattenContent: z.boolean().optional(),
 })
 
 const cerebrasSchema = apiModelIdProviderModelSchema.extend({
diff --git a/src/api/providers/__tests__/lite-llm.spec.ts b/src/api/providers/__tests__/lite-llm.spec.ts
index 9f3a641cb3b..562ad119659 100644
--- a/src/api/providers/__tests__/lite-llm.spec.ts
+++ b/src/api/providers/__tests__/lite-llm.spec.ts
@@ -920,4 +920,206 @@ describe("LiteLLMHandler", () => {
 			expect(id1).not.toBe(id2)
 		})
 	})
+
+	describe("content flattening for auto_router compatibility", () => {
+		it("should flatten array content to string by default (when litellmFlattenContent is undefined)", async () => {
+			const systemPrompt = "You are a helpful assistant"
+			const messages: Anthropic.Messages.MessageParam[] = [
+				{
+					role: "user",
+					content: [
+						{ type: "text", text: "Hello" },
+						{ type: "text", text: "World" },
+					],
+				},
+			]
+
+			const mockStream = {
+				async *[Symbol.asyncIterator]() {
+					yield {
+						choices: [{ delta: { content: "Hi!" } }],
+						usage: { prompt_tokens: 10, completion_tokens: 5 },
+					}
+				},
+			}
+
+			mockCreate.mockReturnValue({
+				withResponse: vi.fn().mockResolvedValue({ data: mockStream }),
+			})
+
+			const generator = handler.createMessage(systemPrompt, messages)
+			for await (const _chunk of generator) {
+				// Consume
+			}
+
+			const createCall = mockCreate.mock.calls[0][0]
+			const userMessage = createCall.messages.find((msg: any) => msg.role === "user")
+
+			// Content should be flattened to a string
+			expect(typeof userMessage.content).toBe("string")
+			expect(userMessage.content).toBe("Hello\n\nWorld")
+		})
+
+		it("should flatten array content to string when litellmFlattenContent is true", async () => {
+			const optionsWithFlatten: ApiHandlerOptions = {
+				...mockOptions,
+				litellmFlattenContent: true,
+			}
+			handler = new LiteLLMHandler(optionsWithFlatten)
+
+			const systemPrompt = "You are a helpful assistant"
+			const messages: Anthropic.Messages.MessageParam[] = [
+				{
+					role: "user",
+					content: [{ type: "text", text: "Single block" }],
+				},
+			]
+
+			const mockStream = {
+				async *[Symbol.asyncIterator]() {
+					yield {
+						choices: [{ delta: { content: "Response" } }],
+						usage: { prompt_tokens: 10, completion_tokens: 5 },
+					}
+				},
+			}
+
+			mockCreate.mockReturnValue({
+				withResponse: vi.fn().mockResolvedValue({ data: mockStream }),
+			})
+
+			const generator = handler.createMessage(systemPrompt, messages)
+			for await (const _chunk of generator) {
+				// Consume
+			}
+
+			const createCall = mockCreate.mock.calls[0][0]
+			const userMessage = createCall.messages.find((msg: any) => msg.role === "user")
+
+			expect(typeof userMessage.content).toBe("string")
+			expect(userMessage.content).toBe("Single block")
+		})
+
+		it("should NOT flatten array content when litellmFlattenContent is false", async () => {
+			const optionsWithoutFlatten: ApiHandlerOptions = {
+				...mockOptions,
+				litellmFlattenContent: false,
+			}
+			handler = new LiteLLMHandler(optionsWithoutFlatten)
+
+			const systemPrompt = "You are a helpful assistant"
+			const messages: Anthropic.Messages.MessageParam[] = [
+				{
+					role: "user",
+					content: [
+						{ type: "text", text: "Hello" },
+						{ type: "text", text: "World" },
+					],
+				},
+			]
+
+			const mockStream = {
+				async *[Symbol.asyncIterator]() {
+					yield {
+						choices: [{ delta: { content: "Hi!" } }],
+						usage: { prompt_tokens: 10, completion_tokens: 5 },
+					}
+				},
+			}
+
+			mockCreate.mockReturnValue({
+				withResponse: vi.fn().mockResolvedValue({ data: mockStream }),
+			})
+
+			const generator = handler.createMessage(systemPrompt, messages)
+			for await (const _chunk of generator) {
+				// Consume
+			}
+
+			const createCall = mockCreate.mock.calls[0][0]
+			const userMessage = createCall.messages.find((msg: any) => msg.role === "user")
+
+			// Content should remain as array
+			expect(Array.isArray(userMessage.content)).toBe(true)
+			expect(userMessage.content).toHaveLength(2)
+		})
+
+		it("should preserve string content unchanged regardless of flatten setting", async () => {
+			const systemPrompt = "You are a helpful assistant"
+			const messages: Anthropic.Messages.MessageParam[] = [
+				{
+					role: "user",
+					content: "Simple string message",
+				},
+			]
+
+			const mockStream = {
+				async *[Symbol.asyncIterator]() {
+					yield {
+						choices: [{ delta: { content: "Response" } }],
+						usage: { prompt_tokens: 10, completion_tokens: 5 },
+					}
+				},
+			}
+
+			mockCreate.mockReturnValue({
+				withResponse: vi.fn().mockResolvedValue({ data: mockStream }),
+			})
+
+			const generator = handler.createMessage(systemPrompt, messages)
+			for await (const _chunk of generator) {
+				// Consume
+			}
+
+			const createCall = mockCreate.mock.calls[0][0]
+			const userMessage = createCall.messages.find((msg: any) => msg.role === "user")
+
+			expect(typeof userMessage.content).toBe("string")
+			expect(userMessage.content).toBe("Simple string message")
+		})
+
+		it("should NOT flatten array content if it contains non-text blocks (images)", async () => {
+			const systemPrompt = "You are a helpful assistant"
+			const messages: Anthropic.Messages.MessageParam[] = [
+				{
+					role: "user",
+					content: [
+						{ type: "text", text: "Look at this image:" },
+						{
+							type: "image",
+							source: {
+								type: "base64",
+								media_type: "image/png",
+								data: "iVBORw0KGgo=",
+							},
+						},
+					],
+				},
+			]
+
+			const mockStream = {
+				async *[Symbol.asyncIterator]() {
+					yield {
+						choices: [{ delta: { content: "I see..." } }],
+						usage: { prompt_tokens: 10, completion_tokens: 5 },
+					}
+				},
+			}
+
+			mockCreate.mockReturnValue({
+				withResponse: vi.fn().mockResolvedValue({ data: mockStream }),
+			})
+
+			const generator = handler.createMessage(systemPrompt, messages)
+			for await (const _chunk of generator) {
+				// Consume
+			}
+
+			const createCall = mockCreate.mock.calls[0][0]
+			const userMessage = createCall.messages.find((msg: any) => msg.role === "user")
+
+			// Content should remain as array since it contains image
+			expect(Array.isArray(userMessage.content)).toBe(true)
+		})
+	})
 })
diff --git a/src/api/providers/lite-llm.ts b/src/api/providers/lite-llm.ts
index cf8d16a1129..a860a6e4477 100644
--- a/src/api/providers/lite-llm.ts
+++ b/src/api/providers/lite-llm.ts
@@ -109,6 +109,45 @@ export class LiteLLMHandler extends RouterProvider implements SingleCompletionHa
 		})
 	}
 
+	/**
+	 * Flatten array content in messages to simple string format.
+	 *
+	 * LiteLLM's auto_router feature passes user content to embedding models for semantic routing.
+	 * However, embedding models expect plain strings, not arrays of content blocks.
+	 * When Roo Code sends messages with array content like:
+	 *   {"role": "user", "content": [{"type": "text", "text": "..."}]}
+	 *
+	 * The auto_router fails because it passes this array directly to embeddings.
+	 * This method flattens such content to simple strings:
+	 *   {"role": "user", "content": "..."}
+	 *
+	 * This is enabled by default via litellmFlattenContent option.
+	 * Users who need multimodal content (images) can disable this.
+	 */
+	private flattenMessageContent(
+		messages: OpenAI.Chat.ChatCompletionMessageParam[],
+	): OpenAI.Chat.ChatCompletionMessageParam[] {
+		return messages.map((msg) => {
+			// Only flatten user and system messages with array content
+			if ((msg.role === "user" || msg.role === "system") && Array.isArray(msg.content)) {
+				// Check if all content blocks are text type
+				const allText = msg.content.every(
+					(part) => typeof part === "object" && "type" in part && part.type === "text",
+				)
+
+				// Only flatten if all content is text (no images)
+				if (allText) {
+					const textParts = msg.content.map((part) => (part as { type: "text"; text: string }).text)
+					return {
+						...msg,
+						content: textParts.join("\n\n"),
+					}
+				}
+			}
+			return msg
+		})
+	}
+
 	override async *createMessage(
 		systemPrompt: string,
 		messages: Anthropic.Messages.MessageParam[],
@@ -116,10 +155,16 @@ export class LiteLLMHandler extends RouterProvider implements SingleCompletionHa
 	): ApiStream {
 		const { id: modelId, info } = await this.fetchModel()
 
-		const openAiMessages = convertToOpenAiMessages(messages, {
+		let openAiMessages = convertToOpenAiMessages(messages, {
 			normalizeToolCallId: sanitizeOpenAiCallId,
 		})
 
+		// Flatten array content to string for compatibility with LiteLLM's auto_router
+		// This is enabled by default (when litellmFlattenContent is undefined or true)
+		if (this.options.litellmFlattenContent !== false) {
+			openAiMessages = this.flattenMessageContent(openAiMessages)
+		}
+
 		// Prepare messages with cache control if enabled and supported
 		let systemMessage: OpenAI.Chat.ChatCompletionMessageParam
 		let enhancedMessages: OpenAI.Chat.ChatCompletionMessageParam[]
diff --git a/webview-ui/src/components/settings/providers/LiteLLM.tsx b/webview-ui/src/components/settings/providers/LiteLLM.tsx
index 38ae1f3a96a..6ee65c178b1 100644
--- a/webview-ui/src/components/settings/providers/LiteLLM.tsx
+++ b/webview-ui/src/components/settings/providers/LiteLLM.tsx
@@ -182,6 +182,20 @@ export const LiteLLM = ({
 				}
 				return null
 			})()}
+
+			{/* Flatten content option for auto_router compatibility */}
+			<div className="mt-4">
+				<VSCodeCheckbox
+					checked={apiConfiguration.litellmFlattenContent !== false}
+					onChange={(e: any) => {
+						setApiConfigurationField("litellmFlattenContent", e.target.checked)
+					}}>
+					<span className="font-medium">{t("settings:providers.litellmFlattenContent")}</span>
+				</VSCodeCheckbox>
+				<div className="text-sm text-vscode-descriptionForeground ml-6 mt-1">
+					{t("settings:providers.litellmFlattenContentDescription")}
+				</div>
+			</div>
 		</>
 	)
 }
diff --git a/webview-ui/src/i18n/locales/ca/settings.json b/webview-ui/src/i18n/locales/ca/settings.json
index 85e4abadcc5..c31b307fc12 100644
--- a/webview-ui/src/i18n/locales/ca/settings.json
+++ b/webview-ui/src/i18n/locales/ca/settings.json
@@ -402,6 +402,8 @@
 		"getXaiApiKey": "Obtenir clau API de xAI",
 		"litellmApiKey": "Clau API de LiteLLM",
 		"litellmBaseUrl": "URL base de LiteLLM",
+		"litellmFlattenContent": "Aplanar contingut dels missatges",
+		"litellmFlattenContentDescription": "Converteix el contingut dels missatges en format matriu a cadenes de text simples. Activeu aquesta opció per a la compatibilitat amb auto_router de LiteLLM i les funcions d'encaminament basades en incrustacions. Desactiveu només si necessiteu contingut multimodal (imatges).",
 		"awsCredentials": "Credencials d'AWS",
 		"awsProfile": "Perfil d'AWS",
 		"awsApiKey": "Clau d'API d'Amazon Bedrock",
diff --git a/webview-ui/src/i18n/locales/de/settings.json b/webview-ui/src/i18n/locales/de/settings.json
index ff7e7b3ea0c..481f65de244 100644
--- a/webview-ui/src/i18n/locales/de/settings.json
+++ b/webview-ui/src/i18n/locales/de/settings.json
@@ -402,6 +402,8 @@
 		"getXaiApiKey": "xAI API-Schlüssel erhalten",
 		"litellmApiKey": "LiteLLM API-Schlüssel",
 		"litellmBaseUrl": "LiteLLM Basis-URL",
+		"litellmFlattenContent": "Nachrichteninhalt abflachen",
+		"litellmFlattenContentDescription": "Konvertiert Array-formatierten Nachrichteninhalt in einfache Zeichenketten. Aktivieren Sie dies für die Kompatibilität mit LiteLLMs auto_router und Embedding-basierten Routing-Funktionen. Deaktivieren Sie es nur, wenn Sie multimodale Inhalte (Bilder) benötigen.",
 		"awsCredentials": "AWS Anmeldedaten",
 		"awsProfile": "AWS Profil",
 		"awsApiKey": "Amazon Bedrock API-Schlüssel",
diff --git a/webview-ui/src/i18n/locales/en/settings.json b/webview-ui/src/i18n/locales/en/settings.json
index 3230c4f93f8..f11e9a61002 100644
--- a/webview-ui/src/i18n/locales/en/settings.json
+++ b/webview-ui/src/i18n/locales/en/settings.json
@@ -456,6 +456,8 @@
 		"getXaiApiKey": "Get xAI API Key",
 		"litellmApiKey": "LiteLLM API Key",
 		"litellmBaseUrl": "LiteLLM Base URL",
+		"litellmFlattenContent": "Flatten message content",
+		"litellmFlattenContentDescription": "Convert array-formatted message content to plain strings. Enable this for compatibility with LiteLLM's auto_router and embedding-based routing features. Disable only if you need multimodal content (images).",
 		"awsCredentials": "AWS Credentials",
 		"awsProfile": "AWS Profile",
 		"awsApiKey": "Amazon Bedrock API Key",
diff --git a/webview-ui/src/i18n/locales/es/settings.json b/webview-ui/src/i18n/locales/es/settings.json
index d02b5d05a76..235b2f6e033 100644
--- a/webview-ui/src/i18n/locales/es/settings.json
+++ b/webview-ui/src/i18n/locales/es/settings.json
@@ -402,6 +402,8 @@
 		"getXaiApiKey": "Obtener clave API de xAI",
 		"litellmApiKey": "Clave API de LiteLLM",
 		"litellmBaseUrl": "URL base de LiteLLM",
+		"litellmFlattenContent": "Aplanar contenido del mensaje",
+		"litellmFlattenContentDescription": "Convierte el contenido del mensaje en formato de matriz a cadenas de texto simples. Habilite esto para compatibilidad con auto_router de LiteLLM y funciones de enrutamiento basadas en embeddings. Deshabilite solo si necesita contenido multimodal (imágenes).",
 		"awsCredentials": "Credenciales de AWS",
 		"awsProfile": "Perfil de AWS",
 		"awsApiKey": "Clave de API de Amazon Bedrock",
diff --git a/webview-ui/src/i18n/locales/fr/settings.json b/webview-ui/src/i18n/locales/fr/settings.json
index d86c1652bc2..e6a5183fd0d 100644
--- a/webview-ui/src/i18n/locales/fr/settings.json
+++ b/webview-ui/src/i18n/locales/fr/settings.json
@@ -402,6 +402,8 @@
 		"getXaiApiKey": "Obtenir la clé API xAI",
 		"litellmApiKey": "Clé API LiteLLM",
 		"litellmBaseUrl": "URL de base LiteLLM",
+		"litellmFlattenContent": "Aplatir le contenu des messages",
+		"litellmFlattenContentDescription": "Convertit le contenu des messages au format tableau en chaînes de caractères simples. Activez cette option pour la compatibilité avec auto_router de LiteLLM et les fonctionnalités de routage basées sur les embeddings. Désactivez uniquement si vous avez besoin de contenu multimodal (images).",
 		"awsCredentials": "Identifiants AWS",
 		"awsProfile": "Profil AWS",
 		"awsApiKey": "Clé API Amazon Bedrock",
diff --git a/webview-ui/src/i18n/locales/hi/settings.json b/webview-ui/src/i18n/locales/hi/settings.json
index 6200d228499..7014ad98f41 100644
--- a/webview-ui/src/i18n/locales/hi/settings.json
+++ b/webview-ui/src/i18n/locales/hi/settings.json
@@ -402,6 +402,8 @@
 		"getXaiApiKey": "xAI API कुंजी प्राप्त करें",
 		"litellmApiKey": "LiteLLM API कुंजी",
 		"litellmBaseUrl": "LiteLLM आधार URL",
+		"litellmFlattenContent": "संदेश सामग्री को सपाट करें",
+		"litellmFlattenContentDescription": "ऐरे प्रारूप में संदेश सामग्री को सादा स्ट्रिंग में बदलें। LiteLLM के auto_router और एम्बेडिंग-आधारित रूटिंग सुविधाओं के साथ संगतता के लिए इसे सक्षम करें। केवल तभी अक्षम करें जब आपको मल्टीमॉडल सामग्री (छवियां) की आवश्यकता हो।",
 		"awsCredentials": "AWS क्रेडेंशियल्स",
 		"awsProfile": "AWS प्रोफाइल",
 		"awsApiKey": "Amazon बेडरॉक API कुंजी",
diff --git a/webview-ui/src/i18n/locales/id/settings.json b/webview-ui/src/i18n/locales/id/settings.json
index 39e0eccb7f8..a3541eae0eb 100644
--- a/webview-ui/src/i18n/locales/id/settings.json
+++ b/webview-ui/src/i18n/locales/id/settings.json
@@ -406,6 +406,8 @@
 		"getXaiApiKey": "Dapatkan xAI API Key",
 		"litellmApiKey": "LiteLLM API Key",
 		"litellmBaseUrl": "LiteLLM Base URL",
+		"litellmFlattenContent": "Ratakan konten pesan",
+		"litellmFlattenContentDescription": "Mengubah konten pesan berformat array menjadi string teks biasa. Aktifkan untuk kompatibilitas dengan auto_router LiteLLM dan fitur routing berbasis embedding. Nonaktifkan hanya jika Anda memerlukan konten multimodal (gambar).",
 		"awsCredentials": "AWS Credentials",
 		"awsProfile": "AWS Profile",
 		"awsApiKey": "Kunci API Amazon Bedrock",
diff --git a/webview-ui/src/i18n/locales/it/settings.json b/webview-ui/src/i18n/locales/it/settings.json
index 74c3da5757d..0dfbcd9f489 100644
--- a/webview-ui/src/i18n/locales/it/settings.json
+++ b/webview-ui/src/i18n/locales/it/settings.json
@@ -402,6 +402,8 @@
 		"getXaiApiKey": "Ottieni chiave API xAI",
 		"litellmApiKey": "Chiave API LiteLLM",
 		"litellmBaseUrl": "URL base LiteLLM",
+		"litellmFlattenContent": "Appiattisci contenuto messaggi",
+		"litellmFlattenContentDescription": "Converte il contenuto dei messaggi in formato array in stringhe semplici. Abilita questa opzione per la compatibilità con auto_router di LiteLLM e le funzionalità di routing basate su embedding. Disabilita solo se hai bisogno di contenuti multimodali (immagini).",
 		"awsCredentials": "Credenziali AWS",
 		"awsProfile": "Profilo AWS",
 		"awsApiKey": "Chiave API Amazon Bedrock",
diff --git a/webview-ui/src/i18n/locales/ja/settings.json b/webview-ui/src/i18n/locales/ja/settings.json
index ae98a2b01b1..c0d809c6f87 100644
--- a/webview-ui/src/i18n/locales/ja/settings.json
+++ b/webview-ui/src/i18n/locales/ja/settings.json
@@ -402,6 +402,8 @@
 		"getXaiApiKey": "xAI APIキーを取得",
 		"litellmApiKey": "LiteLLM APIキー",
 		"litellmBaseUrl": "LiteLLM ベースURL",
+		"litellmFlattenContent": "メッセージコンテンツをフラット化",
+		"litellmFlattenContentDescription": "配列形式のメッセージコンテンツをプレーンな文字列に変換します。LiteLLMのauto_routerおよび埋め込みベースのルーティング機能との互換性のために有効にしてください。マルチモーダルコンテンツ（画像）が必要な場合のみ無効にしてください。",
 		"awsCredentials": "AWS認証情報",
 		"awsProfile": "AWSプロファイル",
 		"awsApiKey": "Amazon Bedrock APIキー",
diff --git a/webview-ui/src/i18n/locales/ko/settings.json b/webview-ui/src/i18n/locales/ko/settings.json
index db6ba45dbc5..b655c1a2ba0 100644
--- a/webview-ui/src/i18n/locales/ko/settings.json
+++ b/webview-ui/src/i18n/locales/ko/settings.json
@@ -402,6 +402,8 @@
 		"getXaiApiKey": "xAI API 키 받기",
 		"litellmApiKey": "LiteLLM API 키",
 		"litellmBaseUrl": "LiteLLM 기본 URL",
+		"litellmFlattenContent": "메시지 콘텐츠 평탄화",
+		"litellmFlattenContentDescription": "배열 형식의 메시지 콘텐츠를 일반 문자열로 변환합니다. LiteLLM의 auto_router 및 임베딩 기반 라우팅 기능과의 호환성을 위해 활성화하세요. 멀티모달 콘텐츠(이미지)가 필요한 경우에만 비활성화하세요.",
 		"awsCredentials": "AWS 자격 증명",
 		"awsProfile": "AWS 프로필",
 		"awsApiKey": "Amazon Bedrock API 키",
diff --git a/webview-ui/src/i18n/locales/nl/settings.json b/webview-ui/src/i18n/locales/nl/settings.json
index 49d02217db2..b7b8f2c4190 100644
--- a/webview-ui/src/i18n/locales/nl/settings.json
+++ b/webview-ui/src/i18n/locales/nl/settings.json
@@ -402,6 +402,8 @@
 		"getXaiApiKey": "xAI API-sleutel ophalen",
 		"litellmApiKey": "LiteLLM API-sleutel",
 		"litellmBaseUrl": "LiteLLM basis-URL",
+		"litellmFlattenContent": "Berichtinhoud afvlakken",
+		"litellmFlattenContentDescription": "Converteert berichtinhoud in array-formaat naar platte tekst. Schakel dit in voor compatibiliteit met LiteLLM's auto_router en op embedding gebaseerde routeringsfuncties. Schakel alleen uit als u multimodale inhoud (afbeeldingen) nodig heeft.",
 		"awsCredentials": "AWS-inloggegevens",
 		"awsProfile": "AWS-profiel",
 		"awsApiKey": "Amazon Bedrock API-sleutel",
diff --git a/webview-ui/src/i18n/locales/pl/settings.json b/webview-ui/src/i18n/locales/pl/settings.json
index a20c9f56e14..337b73b47e0 100644
--- a/webview-ui/src/i18n/locales/pl/settings.json
+++ b/webview-ui/src/i18n/locales/pl/settings.json
@@ -402,6 +402,8 @@
 		"getXaiApiKey": "Uzyskaj klucz API xAI",
 		"litellmApiKey": "Klucz API LiteLLM",
 		"litellmBaseUrl": "URL bazowy LiteLLM",
+		"litellmFlattenContent": "Spłaszcz zawartość wiadomości",
+		"litellmFlattenContentDescription": "Konwertuje zawartość wiadomości w formacie tablicy na zwykłe ciągi znaków. Włącz dla kompatybilności z auto_router LiteLLM i funkcjami routingu opartymi na osadzeniach. Wyłącz tylko jeśli potrzebujesz treści multimodalnych (obrazów).",
 		"awsCredentials": "Poświadczenia AWS",
 		"awsProfile": "Profil AWS",
 		"awsApiKey": "Klucz API Amazon Bedrock",
diff --git a/webview-ui/src/i18n/locales/pt-BR/settings.json b/webview-ui/src/i18n/locales/pt-BR/settings.json
index e96cbb0e743..2f78b0bdd90 100644
--- a/webview-ui/src/i18n/locales/pt-BR/settings.json
+++ b/webview-ui/src/i18n/locales/pt-BR/settings.json
@@ -402,6 +402,8 @@
 		"getXaiApiKey": "Obter chave de API xAI",
 		"litellmApiKey": "Chave API LiteLLM",
 		"litellmBaseUrl": "URL base LiteLLM",
+		"litellmFlattenContent": "Achatar conteúdo das mensagens",
+		"litellmFlattenContentDescription": "Converte o conteúdo das mensagens em formato de array para strings simples. Habilite para compatibilidade com o auto_router do LiteLLM e recursos de roteamento baseados em embeddings. Desabilite apenas se precisar de conteúdo multimodal (imagens).",
 		"awsCredentials": "Credenciais AWS",
 		"awsProfile": "Perfil AWS",
 		"awsApiKey": "Chave de API Amazon Bedrock",
diff --git a/webview-ui/src/i18n/locales/ru/settings.json b/webview-ui/src/i18n/locales/ru/settings.json
index a746f1e29ae..cd8eb952174 100644
--- a/webview-ui/src/i18n/locales/ru/settings.json
+++ b/webview-ui/src/i18n/locales/ru/settings.json
@@ -402,6 +402,8 @@
 		"getXaiApiKey": "Получить xAI API-ключ",
 		"litellmApiKey": "API-ключ LiteLLM",
 		"litellmBaseUrl": "Базовый URL LiteLLM",
+		"litellmFlattenContent": "Выровнять содержимое сообщений",
+		"litellmFlattenContentDescription": "Преобразует содержимое сообщений в формате массива в простые строки. Включите для совместимости с auto_router LiteLLM и функциями маршрутизации на основе эмбеддингов. Отключайте только при необходимости мультимодального контента (изображений).",
 		"awsCredentials": "AWS-учётные данные",
 		"awsProfile": "Профиль AWS",
 		"awsApiKey": "Ключ API Amazon Bedrock",
diff --git a/webview-ui/src/i18n/locales/tr/settings.json b/webview-ui/src/i18n/locales/tr/settings.json
index cbbbb673cc2..8d67b044e33 100644
--- a/webview-ui/src/i18n/locales/tr/settings.json
+++ b/webview-ui/src/i18n/locales/tr/settings.json
@@ -402,6 +402,8 @@
 		"getXaiApiKey": "xAI API Anahtarı Al",
 		"litellmApiKey": "LiteLLM API Anahtarı",
 		"litellmBaseUrl": "LiteLLM Temel URL",
+		"litellmFlattenContent": "Mesaj içeriğini düzleştir",
+		"litellmFlattenContentDescription": "Dizi formatındaki mesaj içeriğini düz metin dizelerine dönüştürür. LiteLLM'in auto_router ve gömme tabanlı yönlendirme özellikleriyle uyumluluk için etkinleştirin. Yalnızca çok modlu içeriğe (görüntüler) ihtiyacınız varsa devre dışı bırakın.",
 		"awsCredentials": "AWS Kimlik Bilgileri",
 		"awsProfile": "AWS Profili",
 		"awsApiKey": "Amazon Bedrock API Anahtarı",
diff --git a/webview-ui/src/i18n/locales/vi/settings.json b/webview-ui/src/i18n/locales/vi/settings.json
index acbbea3688e..90a0eddc62b 100644
--- a/webview-ui/src/i18n/locales/vi/settings.json
+++ b/webview-ui/src/i18n/locales/vi/settings.json
@@ -402,6 +402,8 @@
 		"getXaiApiKey": "Lấy khóa API xAI",
 		"litellmApiKey": "Khóa API LiteLLM",
 		"litellmBaseUrl": "URL cơ sở LiteLLM",
+		"litellmFlattenContent": "Làm phẳng nội dung tin nhắn",
+		"litellmFlattenContentDescription": "Chuyển đổi nội dung tin nhắn định dạng mảng thành chuỗi văn bản thuần. Bật tùy chọn này để tương thích với auto_router của LiteLLM và các tính năng định tuyến dựa trên embedding. Chỉ tắt nếu bạn cần nội dung đa phương thức (hình ảnh).",
 		"awsCredentials": "Thông tin xác thực AWS",
 		"awsProfile": "Hồ sơ AWS",
 		"awsApiKey": "Khóa API Amazon Bedrock",
diff --git a/webview-ui/src/i18n/locales/zh-CN/settings.json b/webview-ui/src/i18n/locales/zh-CN/settings.json
index 57b1b7795c5..8c386495bce 100644
--- a/webview-ui/src/i18n/locales/zh-CN/settings.json
+++ b/webview-ui/src/i18n/locales/zh-CN/settings.json
@@ -402,6 +402,8 @@
 		"getXaiApiKey": "获取 xAI API 密钥",
 		"litellmApiKey": "LiteLLM API 密钥",
 		"litellmBaseUrl": "LiteLLM 基础 URL",
+		"litellmFlattenContent": "展平消息内容",
+		"litellmFlattenContentDescription": "将数组格式的消息内容转换为纯字符串。启用此选项以兼容 LiteLLM 的 auto_router 和基于嵌入的路由功能。仅在需要多模态内容（图像）时禁用。",
 		"awsCredentials": "AWS 凭证",
 		"awsProfile": "AWS 配置文件",
 		"awsApiKey": "Amazon Bedrock 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 04eb9970f23..5dee613741a 100644
--- a/webview-ui/src/i18n/locales/zh-TW/settings.json
+++ b/webview-ui/src/i18n/locales/zh-TW/settings.json
@@ -411,6 +411,8 @@
 		"getXaiApiKey": "取得 xAI API 金鑰",
 		"litellmApiKey": "LiteLLM API 金鑰",
 		"litellmBaseUrl": "LiteLLM 基礎 URL",
+		"litellmFlattenContent": "展平訊息內容",
+		"litellmFlattenContentDescription": "將陣列格式的訊息內容轉換為純字串。啟用此選項以相容 LiteLLM 的 auto_router 和基於嵌入的路由功能。僅在需要多模態內容（圖像）時停用。",
 		"awsCredentials": "AWS 認證",
 		"awsProfile": "AWS Profile",
 		"awsApiKey": "Amazon Bedrock API 金鑰",