diff --git a/src/vs/platform/extensions/common/extensionsApiProposals.ts b/src/vs/platform/extensions/common/extensionsApiProposals.ts
index 4cc3d85620b..52179154197 100644
--- a/src/vs/platform/extensions/common/extensionsApiProposals.ts
+++ b/src/vs/platform/extensions/common/extensionsApiProposals.ts
@@ -255,6 +255,9 @@ const _allApiProposals = {
 	languageModelCapabilities: {
 		proposal: 'https://raw.githubusercontent.com/microsoft/vscode/main/src/vscode-dts/vscode.proposed.languageModelCapabilities.d.ts',
 	},
+	languageModelProxy: {
+		proposal: 'https://raw.githubusercontent.com/microsoft/vscode/main/src/vscode-dts/vscode.proposed.languageModelProxy.d.ts',
+	},
 	languageModelSystem: {
 		proposal: 'https://raw.githubusercontent.com/microsoft/vscode/main/src/vscode-dts/vscode.proposed.languageModelSystem.d.ts',
 	},
diff --git a/src/vs/workbench/api/common/extHost.api.impl.ts b/src/vs/workbench/api/common/extHost.api.impl.ts
index f72d478be71..463fe9c7201 100644
--- a/src/vs/workbench/api/common/extHost.api.impl.ts
+++ b/src/vs/workbench/api/common/extHost.api.impl.ts
@@ -1552,6 +1552,14 @@ export function createApiFactoryAndRegisterActors(accessor: ServicesAccessor): I
 			registerLanguageModelChatProvider: (vendor, provider) => {
 				return extHostLanguageModels.registerLanguageModelChatProvider(extension, vendor, provider);
 			},
+			getModelProxy: () => {
+				checkProposedApiEnabled(extension, 'languageModelProxy');
+				return extHostLanguageModels.getModelProxy(extension);
+			},
+			registerLanguageModelProxyProvider: (provider) => {
+				checkProposedApiEnabled(extension, 'chatParticipantPrivate');
+				return extHostLanguageModels.registerLanguageModelProxyProvider(extension, provider);
+			},
 			// --- embeddings
 			get embeddingModels() {
 				checkProposedApiEnabled(extension, 'embeddings');
diff --git a/src/vs/workbench/api/common/extHostLanguageModels.ts b/src/vs/workbench/api/common/extHostLanguageModels.ts
index dce627ed19a..0342f7285bd 100644
--- a/src/vs/workbench/api/common/extHostLanguageModels.ts
+++ b/src/vs/workbench/api/common/extHostLanguageModels.ts
@@ -121,6 +121,7 @@ export class ExtHostLanguageModels implements ExtHostLanguageModelsShape {
 	private readonly _modelAccessList = new ExtensionIdentifierMap<ExtensionIdentifierSet>();
 	private readonly _pendingRequest = new Map<number, { languageModelId: string; res: LanguageModelResponse }>();
 	private readonly _ignoredFileProviders = new Map<number, vscode.LanguageModelIgnoredFileProvider>();
+	private _languageModelProxyProvider: vscode.LanguageModelProxyProvider | undefined;
 
 	constructor(
 		@IExtHostRpcService extHostRpc: IExtHostRpcService,
@@ -607,6 +608,27 @@ export class ExtHostLanguageModels implements ExtHostLanguageModelsShape {
 		return this._proxy.$fileIsIgnored(uri, token);
 	}
 
+	async getModelProxy(extension: IExtensionDescription): Promise<vscode.LanguageModelProxyInfo | undefined> {
+		checkProposedApiEnabled(extension, 'languageModelProxy');
+
+		if (!this._languageModelProxyProvider) {
+			this._logService.warn('[LanguageModelProxy] No LanguageModelProxyProvider registered');
+			return undefined;
+		}
+
+		const requestingExtensionId = ExtensionIdentifier.toKey(extension.identifier);
+		try {
+			const result = await Promise.resolve(this._languageModelProxyProvider.provideModelProxy(requestingExtensionId, CancellationToken.None));
+			if (result) {
+				return result;
+			}
+		} catch (err) {
+			this._logService.error(`[LanguageModelProxy] Provider ${ExtensionIdentifier.toKey(extension.identifier)} failed`, err);
+		}
+
+		return undefined;
+	}
+
 	async $isFileIgnored(handle: number, uri: UriComponents, token: CancellationToken): Promise<boolean> {
 		const provider = this._ignoredFileProviders.get(handle);
 		if (!provider) {
@@ -627,4 +649,15 @@ export class ExtHostLanguageModels implements ExtHostLanguageModelsShape {
 			this._ignoredFileProviders.delete(handle);
 		});
 	}
+
+	registerLanguageModelProxyProvider(extension: IExtensionDescription, provider: vscode.LanguageModelProxyProvider): vscode.Disposable {
+		checkProposedApiEnabled(extension, 'chatParticipantPrivate');
+
+		this._languageModelProxyProvider = provider;
+		return toDisposable(() => {
+			if (this._languageModelProxyProvider === provider) {
+				this._languageModelProxyProvider = undefined;
+			}
+		});
+	}
 }
diff --git a/src/vscode-dts/vscode.proposed.chatParticipantPrivate.d.ts b/src/vscode-dts/vscode.proposed.chatParticipantPrivate.d.ts
index b8f290ec476..9f90021eeba 100644
--- a/src/vscode-dts/vscode.proposed.chatParticipantPrivate.d.ts
+++ b/src/vscode-dts/vscode.proposed.chatParticipantPrivate.d.ts
@@ -285,4 +285,16 @@ declare module 'vscode' {
 	}
 
 	// #endregion
+
+	// #region LanguageModelProxyProvider
+
+	export interface LanguageModelProxyProvider {
+		provideModelProxy(forExtensionId: string, token: CancellationToken): ProviderResult<LanguageModelProxyInfo>;
+	}
+
+	export namespace lm {
+		export function registerLanguageModelProxyProvider(provider: LanguageModelProxyProvider): Disposable;
+	}
+
+	// #endregion
 }
diff --git a/src/vscode-dts/vscode.proposed.languageModelProxy.d.ts b/src/vscode-dts/vscode.proposed.languageModelProxy.d.ts
new file mode 100644
index 00000000000..32fcc0b0181
--- /dev/null
+++ b/src/vscode-dts/vscode.proposed.languageModelProxy.d.ts
@@ -0,0 +1,20 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+declare module 'vscode' {
+	export interface LanguageModelProxyInfo {
+		readonly uri: Uri;
+		readonly key: string;
+	}
+
+	export namespace lm {
+		/**
+		 * Returns undefined if
+		 * - The user is not logged in, or isn't the right SKU, with expected model access
+		 * - The server fails to start for some reason
+		 */
+		export function getModelProxy(): Thenable<LanguageModelProxyInfo | undefined>;
+	}
+}