feat(llm): add Doubao (Volcengine Ark) as an LLM provider

core/llm/autodetect.ts

@@ -67,6 +67,7 @@ const PROVIDER_HANDLES_TEMPLATING: string[] = [
   "openrouter",
   "clawrouter",
   "deepseek",
+  "doubao",
   "xAI",
   "minimax",
   "groq",

core/llm/llms/Doubao.ts

@@ -0,0 +1,33 @@
+import { LLMOptions } from "../../index.js";
+
+import OpenAI from "./OpenAI.js";
+
+/**
+ * Doubao (豆包) is ByteDance's large-language-model family, served through
+ * Volcengine Ark (火山方舟).
+ *
+ * API surface: OpenAI-compatible `/chat/completions` at
+ * https://ark.cn-beijing.volces.com/api/v3/, Bearer-token auth. Unlike most
+ * OpenAI-compatible providers, Doubao requires users to deploy a model as an
+ * "endpoint" and use the endpoint ID (e.g. `ep-20240xxx-xxxxx`) as the model
+ * identifier — though shared/public endpoints also expose model-name aliases
+ * such as `doubao-1-5-pro-32k` and `doubao-seed-1-6`.
+ *
+ * Docs: https://www.volcengine.com/docs/82379
+ */
+class Doubao extends OpenAI {
+  static providerName = "doubao";
+  static defaultOptions: Partial<LLMOptions> = {
+    apiBase: "https://ark.cn-beijing.volces.com/api/v3/",
+    // Ark model IDs are date-stamped (e.g. `doubao-seed-1-6-251015`) or are
+    // Ark endpoint IDs (`ep-20240xxx-xxxxx`). We intentionally do NOT set a
+    // default `model` here: picking a specific dated ID would go stale, and
+    // users must in practice verify model availability against their own
+    // Ark deployment. Requiring an explicit `model` forces a conscious
+    // decision and avoids silent 404s from Ark.
+    useLegacyCompletionsEndpoint: false,
+  };
+  maxStopWords: number | undefined = 4;
+}
+
+export default Doubao;

core/llm/llms/OpenAI-compatible.vitest.ts

@@ -6,6 +6,7 @@ import Groq from "./Groq.js";
 import Fireworks from "./Fireworks.js";
 import Together from "./Together.js";
 import Deepseek from "./Deepseek.js";
+import Doubao from "./Doubao.js";
 import OpenRouter from "./OpenRouter.js";
 import xAI from "./xAI.js";
 import Mistral from "./Mistral.js";
@@ -370,6 +371,11 @@ createOpenAISubclassTests(Moonshot, {
   defaultApiBase: "https://api.moonshot.cn/v1/",
 });
 
+createOpenAISubclassTests(Doubao, {
+  providerName: "doubao",
+  defaultApiBase: "https://ark.cn-beijing.volces.com/api/v3/",
+});
+
 createOpenAISubclassTests(Novita, {
   providerName: "novita",
   defaultApiBase: "https://api.novita.ai/v3/openai/",

core/llm/llms/index.ts

@@ -21,6 +21,7 @@ import CometAPI from "./CometAPI";
 import DeepInfra from "./DeepInfra";
 import Deepseek from "./Deepseek";
 import Docker from "./Docker";
+import Doubao from "./Doubao";
 import Fireworks from "./Fireworks";
 import Flowise from "./Flowise";
 import FunctionNetwork from "./FunctionNetwork";
@@ -108,6 +109,7 @@ export const LLMClasses = [
   Cloudflare,
   Deepseek,
   Docker,
+  Doubao,
   Msty,
   Azure,
   WatsonX,

docs/customize/model-providers/more/doubao.mdx

@@ -0,0 +1,111 @@
+---
+title: "Doubao (豆包)"
+description: "Configure ByteDance Doubao models served via Volcengine Ark in Continue, including the doubao-seed and doubao-1.5-pro model families."
+---
+
+[Doubao (豆包)](https://www.volcengine.com/product/ark) is ByteDance's large-language-model family served through Volcengine Ark (火山方舟). The service exposes an OpenAI-compatible `/chat/completions` API and is widely used in the China region for both chat and code-assistance workloads.
+
+Continue supports Doubao as a first-class provider. Ark addresses models either by a **date-stamped model ID** (e.g. `doubao-seed-1-6-251015`, `doubao-1-5-pro-32k-250115`) or by an **endpoint ID** you provision in the Ark console (`ep-20240xxx-xxxxx`). Always verify the current model ID in the [Ark model list](https://www.volcengine.com/docs/82379/1330310) before configuring Continue — undated aliases are not guaranteed to resolve.
+
+## Configuration
+
+To use Doubao models:
+
+1. Create an API key on the [Volcengine Ark console](https://console.volcengine.com/ark/).
+2. Either deploy the model you want as an endpoint and copy its endpoint ID, or use a public model alias.
+3. Add the following configuration:
+
+<Tabs>
+  <Tab title="YAML">
+  ```yaml title="config.yaml"
+  name: My Config
+  version: 0.0.1
+  schema: v1
+
+  models:
+    - name: Doubao Seed 1.6
+      provider: doubao
+      model: doubao-seed-1-6-251015
+      apiKey: <YOUR_VOLCENGINE_ARK_API_KEY>
+  ```
+  </Tab>
+  <Tab title="JSON (Deprecated)">
+  ```json title="config.json"
+  {
+    "models": [
+      {
+        "title": "Doubao Seed 1.6",
+        "provider": "doubao",
+        "model": "doubao-seed-1-6-251015",
+        "apiKey": "<YOUR_VOLCENGINE_ARK_API_KEY>"
+      }
+    ]
+  }
+  ```
+  </Tab>
+</Tabs>
+
+## Using an endpoint ID
+
+For custom or newly released models, deploy the model as an Ark endpoint and pass the endpoint ID as the `model`:
+
+```yaml title="config.yaml"
+models:
+  - name: Doubao (custom endpoint)
+    provider: doubao
+    model: ep-20240xxx-xxxxx
+    apiKey: <YOUR_VOLCENGINE_ARK_API_KEY>
+```
+
+Endpoint IDs bypass model-name routing on the Ark gateway and give you full control over which deployment handles the request, including quota and region.
+
+## Configuration Options
+
+| Option    | Description                                          | Default                                           |
+| --------- | ---------------------------------------------------- | ------------------------------------------------- |
+| `apiKey`  | Volcengine Ark API key                               | Required                                          |
+| `apiBase` | Ark API base URL                                     | `https://ark.cn-beijing.volces.com/api/v3/`       |
+| `model`   | Ark model ID (date-stamped) or endpoint ID           | Required                                          |
+
+## Example
+
+Complete configuration with tuned completion options:
+
+<Tabs>
+  <Tab title="YAML">
+  ```yaml title="config.yaml"
+  name: My Config
+  version: 0.0.1
+  schema: v1
+
+  models:
+    - name: Doubao Seed 1.6
+      provider: doubao
+      model: doubao-seed-1-6-251015
+      apiKey: <YOUR_VOLCENGINE_ARK_API_KEY>
+      defaultCompletionOptions:
+        temperature: 0.7
+        topP: 0.95
+        maxTokens: 2048
+  ```
+  </Tab>
+  <Tab title="JSON (Deprecated)">
+  ```json title="config.json"
+  {
+    "models": [
+      {
+        "title": "Doubao Seed 1.6",
+        "provider": "doubao",
+        "model": "doubao-seed-1-6-251015",
+        "apiKey": "<YOUR_VOLCENGINE_ARK_API_KEY>",
+        "completionOptions": {
+          "temperature": 0.7,
+          "topP": 0.95,
+          "maxTokens": 2048
+        }
+      }
+    ]
+  }
+  ```
+  </Tab>
+</Tabs>

packages/openai-adapters/src/apis/Doubao.test.ts

@@ -0,0 +1,34 @@
+import { describe, expect, it } from "vitest";
+import { constructLlmApi } from "../index.js";
+import { DoubaoApi } from "./Doubao.js";
+
+describe("Doubao (ByteDance / Volcengine Ark) adapter", () => {
+  it("registers under the 'doubao' provider and returns a DoubaoApi", () => {
+    const api = constructLlmApi({
+      provider: "doubao",
+      apiKey: "test-key",
+    });
+    expect(api).toBeInstanceOf(DoubaoApi);
+  });
+
+  it("points at the Ark cn-beijing base URL by default", () => {
+    const api = new DoubaoApi({
+      provider: "doubao",
+      apiKey: "test-key",
+    });
+    // apiBase is a public field on the adapter; sanity-check it directly so
+    // a future refactor can't silently swap the default to, say, api.openai.com.
+    expect(api.apiBase).toBe("https://ark.cn-beijing.volces.com/api/v3/");
+  });
+
+  it("inherits from OpenAIApi (OpenAI-compatible Ark /chat/completions)", () => {
+    const api = new DoubaoApi({
+      provider: "doubao",
+      apiKey: "test-key",
+    });
+    // Ark is OpenAI-compatible for /chat/completions; the adapter relies on
+    // the base class, so it must not accidentally drop that relationship.
+    expect(typeof api.chatCompletionStream).toBe("function");
+    expect(typeof api.chatCompletionNonStream).toBe("function");
+  });
+});

packages/openai-adapters/src/apis/Doubao.ts

@@ -0,0 +1,26 @@
+import { DoubaoConfig } from "../types.js";
+import { OpenAIApi } from "./OpenAI.js";
+
+/**
+ * Doubao (豆包) served via Volcengine Ark.
+ *
+ * Uses the OpenAI-compatible `/chat/completions` endpoint. Unlike most
+ * OpenAI-compatible services, Doubao recommends addressing models through
+ * a deployed "endpoint ID" (e.g. `ep-20240xxx-xxxxx`), though shared model
+ * aliases such as `doubao-1-5-pro-32k` also resolve on the public tenancy.
+ *
+ * No custom FIM: Ark does not expose a public `beta/completions` or
+ * `[fill]`-prompt protocol today. If that changes we can override
+ * `fimStream` the way Moonshot and Deepseek do.
+ *
+ * Reference: https://www.volcengine.com/docs/82379
+ */
+export class DoubaoApi extends OpenAIApi {
+  apiBase: string = "https://ark.cn-beijing.volces.com/api/v3/";
+  constructor(config: DoubaoConfig) {
+    super({
+      ...config,
+      provider: "openai",
+    });
+  }
+}

packages/openai-adapters/src/index.ts

@@ -9,6 +9,7 @@ import { CohereApi } from "./apis/Cohere.js";
 import { CometAPIApi } from "./apis/CometAPI.js";
 import { ContinueProxyApi } from "./apis/ContinueProxy.js";
 import { DeepSeekApi } from "./apis/DeepSeek.js";
+import { DoubaoApi } from "./apis/Doubao.js";
 import { GeminiApi } from "./apis/Gemini.js";
 import { InceptionApi } from "./apis/Inception.js";
 import { JinaApi } from "./apis/Jina.js";
@@ -115,6 +116,8 @@ export function constructLlmApi(config: LLMConfig): BaseLlmApi | undefined {
       return new JinaApi(config);
     case "deepseek":
       return new DeepSeekApi(config);
+    case "doubao":
+      return new DoubaoApi(config);
     case "moonshot":
       return new MoonshotApi(config);
     case "relace":

packages/openai-adapters/src/types.ts

@@ -77,6 +77,11 @@ export const DeepseekConfigSchema = OpenAIConfigSchema.extend({
 });
 export type DeepseekConfig = z.infer<typeof DeepseekConfigSchema>;
 
+export const DoubaoConfigSchema = OpenAIConfigSchema.extend({
+  provider: z.literal("doubao"),
+});
+export type DoubaoConfig = z.infer<typeof DoubaoConfigSchema>;
+
 export const MiniMaxConfigSchema = OpenAIConfigSchema.extend({
   provider: z.literal("minimax"),
 });
@@ -271,6 +276,7 @@ export const LLMConfigSchema = z.discriminatedUnion("provider", [
   BedrockConfigSchema,
   MoonshotConfigSchema,
   DeepseekConfigSchema,
+  DoubaoConfigSchema,
   MiniMaxConfigSchema,
   CohereConfigSchema,
   AzureConfigSchema,