feat(anthropic): langchain-anthropic support custom create anthropic client

docs/core_docs/docs/integrations/chat/anthropic.ipynb

@@ -931,6 +931,36 @@
     "For more on how prompt caching works, see [Anthropic's docs](https://docs.anthropic.com/en/docs/build-with-claude/prompt-caching#how-prompt-caching-works)."
    ]
   },
+  {
+   "cell_type": "markdown",
+   "id": "f8dece4e",
+   "metadata": {},
+   "source": [
+    "## Custom clients\n",
+    "\n",
+    "Anthropic models [may be hosted on cloud services such as Google Vertex](https://docs.anthropic.com/en/api/claude-on-vertex-ai) that rely on a different underlying client with the same interface as the primary Anthropic client. You can access these services by providing a `createClient` method that returns an initialized instance of an Anthropic client. Here's an example:"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "00ec6d41",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import { AnthropicVertex } from \"@anthropic-ai/vertex-sdk\";\n",
+    "\n",
+    "const customClient = new AnthropicVertex();\n",
+    "\n",
+    "const modelWithCustomClient = new ChatAnthropic({\n",
+    "  modelName: \"claude-3-sonnet-20240229\",\n",
+    "  maxRetries: 0,\n",
+    "  createClient: () => customClient,\n",
+    "});\n",
+    "\n",
+    "await modelWithCustomClient.invoke([{ role: \"user\", content: \"Hello!\" }]);"
+   ]
+  },
   {
    "cell_type": "markdown",
    "id": "3a5bb5ca-c3ae-4a58-be67-2cd18574b9a3",

docs/core_docs/package.json

@@ -30,6 +30,7 @@
     "validate": "yarn notebook_validate"
   },
   "dependencies": {
+    "@anthropic-ai/vertex-sdk": "^0.4.1",
     "@docusaurus/core": "2.4.3",
     "@docusaurus/preset-classic": "2.4.3",
     "@docusaurus/remark-plugin-npm2yarn": "2.4.3",

libs/langchain-anthropic/package.json

@@ -42,6 +42,7 @@
     "zod-to-json-schema": "^3.22.4"
   },
   "devDependencies": {
+    "@anthropic-ai/vertex-sdk": "^0.4.1",
     "@jest/globals": "^29.5.0",
     "@langchain/scripts": ">=0.1.0 <0.2.0",
     "@langchain/standard-tests": "0.0.0",

libs/langchain-anthropic/src/chat_models.ts

@@ -145,6 +145,14 @@ export interface AnthropicInput {
    * @default true
    */
   streamUsage?: boolean;
+
+  /**
+   * Optional method that returns an initialized underlying Anthropic client.
+   * Useful for accessing Anthropic models hosted on other cloud services
+   * such as Google Vertex.
+   */
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  createClient?: (options: ClientOptions) => any;
 }
 
 /**
@@ -611,6 +619,13 @@ export class ChatAnthropicMessages<
 
   streamUsage = true;
 
+  /**
+   * Optional method that returns an initialized underlying Anthropic client.
+   * Useful for accessing Anthropic models hosted on other cloud services
+   * such as Google Vertex.
+   */
+  createClient: (options: ClientOptions) => Anthropic;
+
   constructor(fields?: AnthropicInput & BaseChatModelParams) {
     super(fields ?? {});
 
@@ -644,6 +659,10 @@ export class ChatAnthropicMessages<
 
     this.streaming = fields?.streaming ?? false;
     this.streamUsage = fields?.streamUsage ?? this.streamUsage;
+
+    this.createClient =
+      fields?.createClient ??
+      ((options: ClientOptions) => new Anthropic(options));
   }
 
   getLsParams(options: this["ParsedCallOptions"]): LangSmithParams {
@@ -908,7 +927,7 @@ export class ChatAnthropicMessages<
   ): Promise<Stream<AnthropicMessageStreamEvent>> {
     if (!this.streamingClient) {
       const options_ = this.apiUrl ? { baseURL: this.apiUrl } : undefined;
-      this.streamingClient = new Anthropic({
+      this.streamingClient = this.createClient({
         ...this.clientOptions,
         ...options_,
         apiKey: this.apiKey,
@@ -938,7 +957,7 @@ export class ChatAnthropicMessages<
       if (!this.apiKey) {
         throw new Error("Missing Anthropic API key.");
       }
-      this.batchClient = new Anthropic({
+      this.batchClient = this.createClient({
         ...this.clientOptions,
         ...options,
         apiKey: this.apiKey,

libs/langchain-anthropic/src/tests/chat_models.int.test.ts

@@ -16,6 +16,7 @@ import {
 } from "@langchain/core/prompts";
 import { CallbackManager } from "@langchain/core/callbacks/manager";
 import { concat } from "@langchain/core/utils/stream";
+import { AnthropicVertex } from "@anthropic-ai/vertex-sdk";
 import { ChatAnthropic } from "../chat_models.js";
 
 test("Test ChatAnthropic", async () => {
@@ -735,3 +736,16 @@ test.skip("tool caching", async () => {
     0
   );
 });
+
+test.skip("Test ChatAnthropic with custom client", async () => {
+  const client = new AnthropicVertex();
+  const chat = new ChatAnthropic({
+    modelName: "claude-3-sonnet-20240229",
+    maxRetries: 0,
+    createClient: () => client,
+  });
+  const message = new HumanMessage("Hello!");
+  const res = await chat.invoke([message]);
+  // console.log({ res });
+  expect(res.response_metadata.usage).toBeDefined();
+});

yarn.lock

@@ -211,6 +211,21 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@anthropic-ai/sdk@npm:>=0.14 <1":
+  version: 0.27.0
+  resolution: "@anthropic-ai/sdk@npm:0.27.0"
+  dependencies:
+    "@types/node": ^18.11.18
+    "@types/node-fetch": ^2.6.4
+    abort-controller: ^3.0.0
+    agentkeepalive: ^4.2.1
+    form-data-encoder: 1.7.2
+    formdata-node: ^4.3.2
+    node-fetch: ^2.6.7
+  checksum: 5cb980769a38a660fa607d9985f4cdae7aabc49053b94fe892f6c3b30f2714c32c6e86c6cf94c8bce9ceea6eed2cd5bac2e1d9d58c9aad0da43681f0a060263d
+  languageName: node
+  linkType: hard
+
 "@anthropic-ai/sdk@npm:^0.25.2":
   version: 0.25.2
   resolution: "@anthropic-ai/sdk@npm:0.25.2"
@@ -226,6 +241,16 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@anthropic-ai/vertex-sdk@npm:^0.4.1":
+  version: 0.4.1
+  resolution: "@anthropic-ai/vertex-sdk@npm:0.4.1"
+  dependencies:
+    "@anthropic-ai/sdk": ">=0.14 <1"
+    google-auth-library: ^9.4.2
+  checksum: 3983c6f1b0e0aa2ce6896a0269177d1374343ba86169a30ad6cc0d9beef40ddcf410159baaa3f0942afbf62930951d067a870aa5c5e0624fe2c47981dc8d8c55
+  languageName: node
+  linkType: hard
+
 "@apache-arrow/ts@npm:^12.0.0":
   version: 12.0.0
   resolution: "@apache-arrow/ts@npm:12.0.0"
@@ -10852,6 +10877,7 @@ __metadata:
   resolution: "@langchain/anthropic@workspace:libs/langchain-anthropic"
   dependencies:
     "@anthropic-ai/sdk": ^0.25.2
+    "@anthropic-ai/vertex-sdk": ^0.4.1
     "@jest/globals": ^29.5.0
     "@langchain/core": ">=0.2.21 <0.3.0"
     "@langchain/scripts": ">=0.1.0 <0.2.0"
@@ -23262,6 +23288,7 @@ __metadata:
   version: 0.0.0-use.local
   resolution: "core_docs@workspace:docs/core_docs"
   dependencies:
+    "@anthropic-ai/vertex-sdk": ^0.4.1
     "@babel/eslint-parser": ^7.18.2
     "@docusaurus/core": 2.4.3
     "@docusaurus/preset-classic": 2.4.3
@@ -28678,6 +28705,20 @@ __metadata:
   languageName: node
   linkType: hard
 
+"google-auth-library@npm:^9.4.2":
+  version: 9.14.0
+  resolution: "google-auth-library@npm:9.14.0"
+  dependencies:
+    base64-js: ^1.3.0
+    ecdsa-sig-formatter: ^1.0.11
+    gaxios: ^6.1.1
+    gcp-metadata: ^6.1.0
+    gtoken: ^7.0.0
+    jws: ^4.0.0
+  checksum: ff2a66e84726b3a25711a64583d86cf9e0c0df857d538ce8127822d220e81e1e7d0defcedecb2be7fc407c104bb7d5ca26a4f201bde871c8d09ef72cc83603f8
+  languageName: node
+  linkType: hard
+
 "google-gax@npm:^4.0.3":
   version: 4.3.3
   resolution: "google-gax@npm:4.3.3"