diff --git a/CHANGELOG.md b/CHANGELOG.md
index 789c67dd50..77f835f5ce 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,6 +16,7 @@ Docs: https://docs.openclaw.ai
 - Agents: include runtime shell in agent envelopes. (#1835) Thanks @Takhoffman.
 - Agents: auto-select `zai/glm-4.6v` for image understanding when ZAI is primary provider. (#10267) Thanks @liuy.
 - Paths: add `OPENCLAW_HOME` for overriding the home directory used by internal path resolution. (#12091) Thanks @sebslight.
+- Onboarding: add Custom API Endpoint flow for OpenAI and Anthropic-compatible endpoints. (#11106) Thanks @MackDing.
 
 ### Fixes
 
diff --git a/docs/cli/onboard.md b/docs/cli/onboard.md
index 9179865975..1fa2e5766d 100644
--- a/docs/cli/onboard.md
+++ b/docs/cli/onboard.md
@@ -12,6 +12,7 @@ Interactive onboarding wizard (local or remote Gateway setup).
 ## Related guides
 
 - CLI onboarding hub: [Onboarding Wizard (CLI)](/start/wizard)
+- Onboarding overview: [Onboarding Overview](/start/onboarding-overview)
 - CLI onboarding reference: [CLI Onboarding Reference](/start/wizard-cli-reference)
 - CLI automation: [CLI Automation](/start/wizard-cli-automation)
 - macOS onboarding: [Onboarding (macOS App)](/start/onboarding)
@@ -30,6 +31,8 @@ Flow notes:
 - `quickstart`: minimal prompts, auto-generates a gateway token.
 - `manual`: full prompts for port/bind/auth (alias of `advanced`).
 - Fastest first chat: `openclaw dashboard` (Control UI, no channel setup).
+- Custom API Endpoint: connect any OpenAI or Anthropic compatible endpoint,
+  including hosted providers not listed. Use Unknown to auto-detect.
 
 ## Common follow-up commands
 
diff --git a/docs/docs.json b/docs/docs.json
index d44137c4e1..93c55b2920 100644
--- a/docs/docs.json
+++ b/docs/docs.json
@@ -802,7 +802,12 @@
               },
               {
                 "group": "First steps",
-                "pages": ["start/getting-started", "start/wizard", "start/onboarding"]
+                "pages": [
+                  "start/getting-started",
+                  "start/onboarding-overview",
+                  "start/wizard",
+                  "start/onboarding"
+                ]
               },
               {
                 "group": "Guides",
diff --git a/docs/start/onboarding-overview.md b/docs/start/onboarding-overview.md
new file mode 100644
index 0000000000..dd91333880
--- /dev/null
+++ b/docs/start/onboarding-overview.md
@@ -0,0 +1,51 @@
+---
+summary: "Overview of OpenClaw onboarding options and flows"
+read_when:
+  - Choosing an onboarding path
+  - Setting up a new environment
+title: "Onboarding Overview"
+sidebarTitle: "Onboarding Overview"
+---
+
+# Onboarding Overview
+
+OpenClaw supports multiple onboarding paths depending on where the Gateway runs
+and how you prefer to configure providers.
+
+## Choose your onboarding path
+
+- **CLI wizard** for macOS, Linux, and Windows (via WSL2).
+- **macOS app** for a guided first run on Apple silicon or Intel Macs.
+
+## CLI onboarding wizard
+
+Run the wizard in a terminal:
+
+```bash
+openclaw onboard
+```
+
+Use the CLI wizard when you want full control of the Gateway, workspace,
+channels, and skills. Docs:
+
+- [Onboarding Wizard (CLI)](/start/wizard)
+- [`openclaw onboard` command](/cli/onboard)
+
+## macOS app onboarding
+
+Use the OpenClaw app when you want a fully guided setup on macOS. Docs:
+
+- [Onboarding (macOS App)](/start/onboarding)
+
+## Custom API Endpoint
+
+If you need an endpoint that is not listed, including hosted providers that
+expose standard OpenAI or Anthropic APIs, choose **Custom API Endpoint** in the
+CLI wizard. You will be asked to:
+
+- Pick OpenAI-compatible, Anthropic-compatible, or **Unknown** (auto-detect).
+- Enter a base URL and API key (if required by the provider).
+- Provide a model ID and optional alias.
+- Choose an Endpoint ID so multiple custom endpoints can coexist.
+
+For detailed steps, follow the CLI onboarding docs above.
diff --git a/docs/start/onboarding.md b/docs/start/onboarding.md
index be8710a4dc..ab9289b8a1 100644
--- a/docs/start/onboarding.md
+++ b/docs/start/onboarding.md
@@ -12,6 +12,7 @@ sidebarTitle: "Onboarding: macOS App"
 This doc describes the **current** first‑run onboarding flow. The goal is a
 smooth “day 0” experience: pick where the Gateway runs, connect auth, run the
 wizard, and let the agent bootstrap itself.
+For a general overview of onboarding paths, see [Onboarding Overview](/start/onboarding-overview).
 
 <Steps>
 <Step title="Approve macOS warning">
diff --git a/docs/start/wizard.md b/docs/start/wizard.md
index c8e3f874b8..31adb175aa 100644
--- a/docs/start/wizard.md
+++ b/docs/start/wizard.md
@@ -62,7 +62,8 @@ The wizard starts with **QuickStart** (defaults) vs **Advanced** (full control).
 
 **Local mode (default)** walks you through these steps:
 
-1. **Model/Auth** — Anthropic API key (recommended), OAuth, OpenAI, or other providers. Pick a default model.
+1. **Model/Auth** — Anthropic API key (recommended), OpenAI, or Custom API Endpoint
+   (OpenAI-compatible, Anthropic-compatible, or Unknown auto-detect). Pick a default model.
 2. **Workspace** — Location for agent files (default `~/.openclaw/workspace`). Seeds bootstrap files.
 3. **Gateway** — Port, bind address, auth mode, Tailscale exposure.
 4. **Channels** — WhatsApp, Telegram, Discord, Google Chat, Mattermost, Signal, BlueBubbles, or iMessage.
@@ -104,5 +105,6 @@ RPC API, and a full list of config fields the wizard writes, see the
 ## Related docs
 
 - CLI command reference: [`openclaw onboard`](/cli/onboard)
+- Onboarding overview: [Onboarding Overview](/start/onboarding-overview)
 - macOS app onboarding: [Onboarding](/start/onboarding)
 - Agent first-run ritual: [Agent Bootstrapping](/start/bootstrapping)
diff --git a/src/commands/auth-choice-options.ts b/src/commands/auth-choice-options.ts
index 3840aecc31..6c710521f8 100644
--- a/src/commands/auth-choice-options.ts
+++ b/src/commands/auth-choice-options.ts
@@ -25,7 +25,8 @@ export type AuthChoiceGroupId =
   | "qwen"
   | "together"
   | "qianfan"
-  | "xai";
+  | "xai"
+  | "custom";
 
 export type AuthChoiceGroup = {
   value: AuthChoiceGroupId;
@@ -148,6 +149,12 @@ const AUTH_CHOICE_GROUP_DEFS: {
     hint: "Account ID + Gateway ID + API key",
     choices: ["cloudflare-ai-gateway-api-key"],
   },
+  {
+    value: "custom",
+    label: "Custom API Endpoint",
+    hint: "Any OpenAI or Anthropic compatible endpoint",
+    choices: ["custom-api-key"],
+  },
 ];
 
 export function buildAuthChoiceOptions(params: {
@@ -252,6 +259,8 @@ export function buildAuthChoiceOptions(params: {
     label: "MiniMax M2.1 Lightning",
     hint: "Faster, higher output cost",
   });
+  options.push({ value: "custom-api-key", label: "Custom API Endpoint" });
+
   if (params.includeSkip) {
     options.push({ value: "skip", label: "Skip for now" });
   }
diff --git a/src/commands/auth-choice-prompt.ts b/src/commands/auth-choice-prompt.ts
index 3fbacdfdb4..8eef15e079 100644
--- a/src/commands/auth-choice-prompt.ts
+++ b/src/commands/auth-choice-prompt.ts
@@ -42,6 +42,10 @@ export async function promptAuthChoiceGrouped(params: {
       continue;
     }
 
+    if (group.options.length === 1) {
+      return group.options[0].value;
+    }
+
     const methodSelection = await params.prompter.select({
       message: `${group.label} auth method`,
       options: [...group.options, { value: BACK_VALUE, label: "Back" }],
diff --git a/src/commands/auth-choice.preferred-provider.ts b/src/commands/auth-choice.preferred-provider.ts
index c9820c46f8..87066bf401 100644
--- a/src/commands/auth-choice.preferred-provider.ts
+++ b/src/commands/auth-choice.preferred-provider.ts
@@ -35,6 +35,7 @@ const PREFERRED_PROVIDER_BY_AUTH_CHOICE: Partial<Record<AuthChoice, string>> = {
   "qwen-portal": "qwen-portal",
   "minimax-portal": "minimax-portal",
   "qianfan-api-key": "qianfan",
+  "custom-api-key": "custom",
 };
 
 export function resolvePreferredProviderForAuthChoice(choice: AuthChoice): string | undefined {
diff --git a/src/commands/configure.gateway-auth.ts b/src/commands/configure.gateway-auth.ts
index c15ad9316d..0296c51292 100644
--- a/src/commands/configure.gateway-auth.ts
+++ b/src/commands/configure.gateway-auth.ts
@@ -11,6 +11,7 @@ import {
   promptDefaultModel,
   promptModelAllowlist,
 } from "./model-picker.js";
+import { promptCustomApiConfig } from "./onboard-custom.js";
 
 type GatewayAuthChoice = "token" | "password";
 
@@ -53,7 +54,10 @@ export async function promptAuthConfig(
   });
 
   let next = cfg;
-  if (authChoice !== "skip") {
+  if (authChoice === "custom-api-key") {
+    const customResult = await promptCustomApiConfig({ prompter, runtime, config: next });
+    next = customResult.config;
+  } else if (authChoice !== "skip") {
     const applied = await applyAuthChoice({
       authChoice,
       config: next,
@@ -78,16 +82,18 @@ export async function promptAuthConfig(
   const anthropicOAuth =
     authChoice === "setup-token" || authChoice === "token" || authChoice === "oauth";
 
-  const allowlistSelection = await promptModelAllowlist({
-    config: next,
-    prompter,
-    allowedKeys: anthropicOAuth ? ANTHROPIC_OAUTH_MODEL_KEYS : undefined,
-    initialSelections: anthropicOAuth ? ["anthropic/claude-opus-4-6"] : undefined,
-    message: anthropicOAuth ? "Anthropic OAuth models" : undefined,
-  });
-  if (allowlistSelection.models) {
-    next = applyModelAllowlist(next, allowlistSelection.models);
-    next = applyModelFallbacksFromSelection(next, allowlistSelection.models);
+  if (authChoice !== "custom-api-key") {
+    const allowlistSelection = await promptModelAllowlist({
+      config: next,
+      prompter,
+      allowedKeys: anthropicOAuth ? ANTHROPIC_OAUTH_MODEL_KEYS : undefined,
+      initialSelections: anthropicOAuth ? ["anthropic/claude-opus-4-6"] : undefined,
+      message: anthropicOAuth ? "Anthropic OAuth models" : undefined,
+    });
+    if (allowlistSelection.models) {
+      next = applyModelAllowlist(next, allowlistSelection.models);
+      next = applyModelFallbacksFromSelection(next, allowlistSelection.models);
+    }
   }
 
   return next;
diff --git a/src/commands/onboard-custom.test.ts b/src/commands/onboard-custom.test.ts
new file mode 100644
index 0000000000..16c07c287c
--- /dev/null
+++ b/src/commands/onboard-custom.test.ts
@@ -0,0 +1,270 @@
+import { afterEach, describe, expect, it, vi } from "vitest";
+import { defaultRuntime } from "../runtime.js";
+import { promptCustomApiConfig } from "./onboard-custom.js";
+
+// Mock dependencies
+vi.mock("./model-picker.js", () => ({
+  applyPrimaryModel: vi.fn((cfg) => cfg),
+}));
+
+describe("promptCustomApiConfig", () => {
+  afterEach(() => {
+    vi.unstubAllGlobals();
+    vi.useRealTimers();
+  });
+
+  it("handles openai flow and saves alias", async () => {
+    const prompter = {
+      text: vi
+        .fn()
+        .mockResolvedValueOnce("http://localhost:11434/v1") // Base URL
+        .mockResolvedValueOnce("") // API Key
+        .mockResolvedValueOnce("llama3") // Model ID
+        .mockResolvedValueOnce("custom") // Endpoint ID
+        .mockResolvedValueOnce("local"), // Alias
+      progress: vi.fn(() => ({
+        update: vi.fn(),
+        stop: vi.fn(),
+      })),
+      select: vi.fn().mockResolvedValueOnce("openai"), // Compatibility
+      confirm: vi.fn(),
+      note: vi.fn(),
+    };
+
+    vi.stubGlobal(
+      "fetch",
+      vi.fn().mockResolvedValueOnce({
+        ok: true,
+        json: async () => ({}),
+      }),
+    );
+
+    const result = await promptCustomApiConfig({
+      prompter: prompter as unknown as Parameters<typeof promptCustomApiConfig>[0]["prompter"],
+      runtime: { ...defaultRuntime, log: vi.fn() },
+      config: {},
+    });
+
+    expect(prompter.text).toHaveBeenCalledTimes(5);
+    expect(prompter.select).toHaveBeenCalledTimes(1);
+    expect(result.config.models?.providers?.custom?.api).toBe("openai-completions");
+    expect(result.config.agents?.defaults?.models?.["custom/llama3"]?.alias).toBe("local");
+  });
+
+  it("retries when verification fails", async () => {
+    const prompter = {
+      text: vi
+        .fn()
+        .mockResolvedValueOnce("http://localhost:11434/v1") // Base URL
+        .mockResolvedValueOnce("") // API Key
+        .mockResolvedValueOnce("bad-model") // Model ID
+        .mockResolvedValueOnce("good-model") // Model ID retry
+        .mockResolvedValueOnce("custom") // Endpoint ID
+        .mockResolvedValueOnce(""), // Alias
+      progress: vi.fn(() => ({
+        update: vi.fn(),
+        stop: vi.fn(),
+      })),
+      select: vi
+        .fn()
+        .mockResolvedValueOnce("openai") // Compatibility
+        .mockResolvedValueOnce("model"), // Retry choice
+      confirm: vi.fn(),
+      note: vi.fn(),
+    };
+
+    vi.stubGlobal(
+      "fetch",
+      vi
+        .fn()
+        .mockResolvedValueOnce({ ok: false, status: 400, json: async () => ({}) })
+        .mockResolvedValueOnce({ ok: true, json: async () => ({}) }),
+    );
+
+    await promptCustomApiConfig({
+      prompter: prompter as unknown as Parameters<typeof promptCustomApiConfig>[0]["prompter"],
+      runtime: { ...defaultRuntime, log: vi.fn() },
+      config: {},
+    });
+
+    expect(prompter.text).toHaveBeenCalledTimes(6);
+    expect(prompter.select).toHaveBeenCalledTimes(2);
+  });
+
+  it("detects openai compatibility when unknown", async () => {
+    const prompter = {
+      text: vi
+        .fn()
+        .mockResolvedValueOnce("https://example.com/v1") // Base URL
+        .mockResolvedValueOnce("test-key") // API Key
+        .mockResolvedValueOnce("detected-model") // Model ID
+        .mockResolvedValueOnce("custom") // Endpoint ID
+        .mockResolvedValueOnce("alias"), // Alias
+      progress: vi.fn(() => ({
+        update: vi.fn(),
+        stop: vi.fn(),
+      })),
+      select: vi.fn().mockResolvedValueOnce("unknown"),
+      confirm: vi.fn(),
+      note: vi.fn(),
+    };
+
+    vi.stubGlobal(
+      "fetch",
+      vi.fn().mockResolvedValueOnce({
+        ok: true,
+        json: async () => ({}),
+      }),
+    );
+
+    const result = await promptCustomApiConfig({
+      prompter: prompter as unknown as Parameters<typeof promptCustomApiConfig>[0]["prompter"],
+      runtime: { ...defaultRuntime, log: vi.fn() },
+      config: {},
+    });
+
+    expect(prompter.text).toHaveBeenCalledTimes(5);
+    expect(prompter.select).toHaveBeenCalledTimes(1);
+    expect(result.config.models?.providers?.custom?.api).toBe("openai-completions");
+  });
+
+  it("re-prompts base url when unknown detection fails", async () => {
+    const prompter = {
+      text: vi
+        .fn()
+        .mockResolvedValueOnce("https://bad.example.com/v1") // Base URL #1
+        .mockResolvedValueOnce("bad-key") // API Key #1
+        .mockResolvedValueOnce("bad-model") // Model ID #1
+        .mockResolvedValueOnce("https://ok.example.com/v1") // Base URL #2
+        .mockResolvedValueOnce("ok-key") // API Key #2
+        .mockResolvedValueOnce("custom") // Endpoint ID
+        .mockResolvedValueOnce(""), // Alias
+      progress: vi.fn(() => ({
+        update: vi.fn(),
+        stop: vi.fn(),
+      })),
+      select: vi.fn().mockResolvedValueOnce("unknown").mockResolvedValueOnce("baseUrl"),
+      confirm: vi.fn(),
+      note: vi.fn(),
+    };
+
+    vi.stubGlobal(
+      "fetch",
+      vi
+        .fn()
+        .mockResolvedValueOnce({ ok: false, status: 404, json: async () => ({}) })
+        .mockResolvedValueOnce({ ok: false, status: 404, json: async () => ({}) })
+        .mockResolvedValueOnce({ ok: true, json: async () => ({}) }),
+    );
+
+    await promptCustomApiConfig({
+      prompter: prompter as unknown as Parameters<typeof promptCustomApiConfig>[0]["prompter"],
+      runtime: { ...defaultRuntime, log: vi.fn() },
+      config: {},
+    });
+
+    expect(prompter.note).toHaveBeenCalledWith(
+      expect.stringContaining("did not respond"),
+      "Endpoint detection",
+    );
+  });
+
+  it("renames provider id when baseUrl differs", async () => {
+    const prompter = {
+      text: vi
+        .fn()
+        .mockResolvedValueOnce("http://localhost:11434/v1") // Base URL
+        .mockResolvedValueOnce("") // API Key
+        .mockResolvedValueOnce("llama3") // Model ID
+        .mockResolvedValueOnce("custom") // Endpoint ID
+        .mockResolvedValueOnce(""), // Alias
+      progress: vi.fn(() => ({
+        update: vi.fn(),
+        stop: vi.fn(),
+      })),
+      select: vi.fn().mockResolvedValueOnce("openai"),
+      confirm: vi.fn(),
+      note: vi.fn(),
+    };
+
+    vi.stubGlobal(
+      "fetch",
+      vi.fn().mockResolvedValueOnce({
+        ok: true,
+        json: async () => ({}),
+      }),
+    );
+
+    const result = await promptCustomApiConfig({
+      prompter: prompter as unknown as Parameters<typeof promptCustomApiConfig>[0]["prompter"],
+      runtime: { ...defaultRuntime, log: vi.fn() },
+      config: {
+        models: {
+          providers: {
+            custom: {
+              baseUrl: "http://old.example.com/v1",
+              api: "openai-completions",
+              models: [
+                {
+                  id: "old-model",
+                  name: "Old",
+                  contextWindow: 1,
+                  maxTokens: 1,
+                  input: ["text"],
+                  cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0 },
+                  reasoning: false,
+                },
+              ],
+            },
+          },
+        },
+      },
+    });
+
+    expect(result.providerId).toBe("custom-2");
+    expect(result.config.models?.providers?.custom).toBeDefined();
+    expect(result.config.models?.providers?.["custom-2"]).toBeDefined();
+  });
+
+  it("aborts verification after timeout", async () => {
+    vi.useFakeTimers();
+    const prompter = {
+      text: vi
+        .fn()
+        .mockResolvedValueOnce("http://localhost:11434/v1") // Base URL
+        .mockResolvedValueOnce("") // API Key
+        .mockResolvedValueOnce("slow-model") // Model ID
+        .mockResolvedValueOnce("fast-model") // Model ID retry
+        .mockResolvedValueOnce("custom") // Endpoint ID
+        .mockResolvedValueOnce(""), // Alias
+      progress: vi.fn(() => ({
+        update: vi.fn(),
+        stop: vi.fn(),
+      })),
+      select: vi.fn().mockResolvedValueOnce("openai").mockResolvedValueOnce("model"),
+      confirm: vi.fn(),
+      note: vi.fn(),
+    };
+
+    const fetchMock = vi
+      .fn()
+      .mockImplementationOnce((_url: string, init?: { signal?: AbortSignal }) => {
+        return new Promise((_resolve, reject) => {
+          init?.signal?.addEventListener("abort", () => reject(new Error("AbortError")));
+        });
+      })
+      .mockResolvedValueOnce({ ok: true, json: async () => ({}) });
+    vi.stubGlobal("fetch", fetchMock);
+
+    const promise = promptCustomApiConfig({
+      prompter: prompter as unknown as Parameters<typeof promptCustomApiConfig>[0]["prompter"],
+      runtime: { ...defaultRuntime, log: vi.fn() },
+      config: {},
+    });
+
+    await vi.advanceTimersByTimeAsync(10000);
+    await promise;
+
+    expect(prompter.text).toHaveBeenCalledTimes(6);
+  });
+});
diff --git a/src/commands/onboard-custom.ts b/src/commands/onboard-custom.ts
new file mode 100644
index 0000000000..c0d4645434
--- /dev/null
+++ b/src/commands/onboard-custom.ts
@@ -0,0 +1,476 @@
+import type { OpenClawConfig } from "../config/config.js";
+import type { ModelProviderConfig } from "../config/types.models.js";
+import type { RuntimeEnv } from "../runtime.js";
+import type { WizardPrompter } from "../wizard/prompts.js";
+import { DEFAULT_PROVIDER } from "../agents/defaults.js";
+import { buildModelAliasIndex, modelKey } from "../agents/model-selection.js";
+import { fetchWithTimeout } from "../utils/fetch-timeout.js";
+import { applyPrimaryModel } from "./model-picker.js";
+import { normalizeAlias } from "./models/shared.js";
+
+const DEFAULT_OLLAMA_BASE_URL = "http://127.0.0.1:11434/v1";
+const DEFAULT_CONTEXT_WINDOW = 4096;
+const DEFAULT_MAX_TOKENS = 4096;
+const VERIFY_TIMEOUT_MS = 10000;
+
+type CustomApiCompatibility = "openai" | "anthropic";
+type CustomApiCompatibilityChoice = CustomApiCompatibility | "unknown";
+type CustomApiResult = {
+  config: OpenClawConfig;
+  providerId?: string;
+  modelId?: string;
+};
+
+const COMPATIBILITY_OPTIONS: Array<{
+  value: CustomApiCompatibilityChoice;
+  label: string;
+  hint: string;
+  api?: "openai-completions" | "anthropic-messages";
+}> = [
+  {
+    value: "openai",
+    label: "OpenAI-compatible",
+    hint: "Uses /chat/completions",
+    api: "openai-completions",
+  },
+  {
+    value: "anthropic",
+    label: "Anthropic-compatible",
+    hint: "Uses /messages",
+    api: "anthropic-messages",
+  },
+  {
+    value: "unknown",
+    label: "Unknown (detect automatically)",
+    hint: "Probes OpenAI then Anthropic endpoints",
+  },
+];
+
+function normalizeEndpointId(raw: string): string {
+  const trimmed = raw.trim().toLowerCase();
+  if (!trimmed) {
+    return "";
+  }
+  return trimmed.replace(/[^a-z0-9-]+/g, "-").replace(/^-+|-+$/g, "");
+}
+
+function buildEndpointIdFromUrl(baseUrl: string): string {
+  try {
+    const url = new URL(baseUrl);
+    const host = url.hostname.replace(/[^a-z0-9]+/gi, "-").toLowerCase();
+    const port = url.port ? `-${url.port}` : "";
+    const candidate = `custom-${host}${port}`;
+    return normalizeEndpointId(candidate) || "custom";
+  } catch {
+    return "custom";
+  }
+}
+
+function resolveUniqueEndpointId(params: {
+  requestedId: string;
+  baseUrl: string;
+  providers: Record<string, ModelProviderConfig | undefined>;
+}) {
+  const normalized = normalizeEndpointId(params.requestedId) || "custom";
+  const existing = params.providers[normalized];
+  if (!existing?.baseUrl || existing.baseUrl === params.baseUrl) {
+    return { providerId: normalized, renamed: false };
+  }
+  let suffix = 2;
+  let candidate = `${normalized}-${suffix}`;
+  while (params.providers[candidate]) {
+    suffix += 1;
+    candidate = `${normalized}-${suffix}`;
+  }
+  return { providerId: candidate, renamed: true };
+}
+
+function resolveAliasError(params: {
+  raw: string;
+  cfg: OpenClawConfig;
+  modelRef: string;
+}): string | undefined {
+  const trimmed = params.raw.trim();
+  if (!trimmed) {
+    return undefined;
+  }
+  let normalized: string;
+  try {
+    normalized = normalizeAlias(trimmed);
+  } catch (err) {
+    return err instanceof Error ? err.message : "Alias is invalid.";
+  }
+  const aliasIndex = buildModelAliasIndex({
+    cfg: params.cfg,
+    defaultProvider: DEFAULT_PROVIDER,
+  });
+  const aliasKey = normalized.toLowerCase();
+  const existing = aliasIndex.byAlias.get(aliasKey);
+  if (!existing) {
+    return undefined;
+  }
+  const existingKey = modelKey(existing.ref.provider, existing.ref.model);
+  if (existingKey === params.modelRef) {
+    return undefined;
+  }
+  return `Alias ${normalized} already points to ${existingKey}.`;
+}
+
+function buildOpenAiHeaders(apiKey: string) {
+  const headers: Record<string, string> = {};
+  if (apiKey) {
+    headers.Authorization = `Bearer ${apiKey}`;
+  }
+  return headers;
+}
+
+function buildAnthropicHeaders(apiKey: string) {
+  const headers: Record<string, string> = {
+    "anthropic-version": "2023-06-01",
+  };
+  if (apiKey) {
+    headers["x-api-key"] = apiKey;
+  }
+  return headers;
+}
+
+function formatVerificationError(error: unknown): string {
+  if (!error) {
+    return "unknown error";
+  }
+  if (error instanceof Error) {
+    return error.message;
+  }
+  if (typeof error === "string") {
+    return error;
+  }
+  try {
+    return JSON.stringify(error);
+  } catch {
+    return "unknown error";
+  }
+}
+
+type VerificationResult = {
+  ok: boolean;
+  status?: number;
+  error?: unknown;
+};
+
+async function requestOpenAiVerification(params: {
+  baseUrl: string;
+  apiKey: string;
+  modelId: string;
+}): Promise<VerificationResult> {
+  const endpoint = new URL(
+    "chat/completions",
+    params.baseUrl.endsWith("/") ? params.baseUrl : `${params.baseUrl}/`,
+  ).href;
+  try {
+    const res = await fetchWithTimeout(
+      endpoint,
+      {
+        method: "POST",
+        headers: {
+          "Content-Type": "application/json",
+          ...buildOpenAiHeaders(params.apiKey),
+        },
+        body: JSON.stringify({
+          model: params.modelId,
+          messages: [{ role: "user", content: "Hi" }],
+          max_tokens: 5,
+        }),
+      },
+      VERIFY_TIMEOUT_MS,
+    );
+    return { ok: res.ok, status: res.status };
+  } catch (error) {
+    return { ok: false, error };
+  }
+}
+
+async function requestAnthropicVerification(params: {
+  baseUrl: string;
+  apiKey: string;
+  modelId: string;
+}): Promise<VerificationResult> {
+  const endpoint = new URL(
+    "messages",
+    params.baseUrl.endsWith("/") ? params.baseUrl : `${params.baseUrl}/`,
+  ).href;
+  try {
+    const res = await fetchWithTimeout(
+      endpoint,
+      {
+        method: "POST",
+        headers: {
+          "Content-Type": "application/json",
+          ...buildAnthropicHeaders(params.apiKey),
+        },
+        body: JSON.stringify({
+          model: params.modelId,
+          max_tokens: 16,
+          messages: [{ role: "user", content: "Hi" }],
+        }),
+      },
+      VERIFY_TIMEOUT_MS,
+    );
+    return { ok: res.ok, status: res.status };
+  } catch (error) {
+    return { ok: false, error };
+  }
+}
+
+async function promptBaseUrlAndKey(params: {
+  prompter: WizardPrompter;
+  initialBaseUrl?: string;
+}): Promise<{ baseUrl: string; apiKey: string }> {
+  const baseUrlInput = await params.prompter.text({
+    message: "API Base URL",
+    initialValue: params.initialBaseUrl ?? DEFAULT_OLLAMA_BASE_URL,
+    placeholder: "https://api.example.com/v1",
+    validate: (val) => {
+      try {
+        new URL(val);
+        return undefined;
+      } catch {
+        return "Please enter a valid URL (e.g. http://...)";
+      }
+    },
+  });
+  const apiKeyInput = await params.prompter.text({
+    message: "API Key (leave blank if not required)",
+    placeholder: "sk-...",
+    initialValue: "",
+  });
+  return { baseUrl: baseUrlInput.trim(), apiKey: apiKeyInput.trim() };
+}
+
+export async function promptCustomApiConfig(params: {
+  prompter: WizardPrompter;
+  runtime: RuntimeEnv;
+  config: OpenClawConfig;
+}): Promise<CustomApiResult> {
+  const { prompter, runtime, config } = params;
+
+  const baseInput = await promptBaseUrlAndKey({ prompter });
+  let baseUrl = baseInput.baseUrl;
+  let apiKey = baseInput.apiKey;
+
+  const compatibilityChoice = await prompter.select({
+    message: "Endpoint compatibility",
+    options: COMPATIBILITY_OPTIONS.map((option) => ({
+      value: option.value,
+      label: option.label,
+      hint: option.hint,
+    })),
+  });
+
+  let modelId = (
+    await prompter.text({
+      message: "Model ID",
+      placeholder: "e.g. llama3, claude-3-7-sonnet",
+      validate: (val) => (val.trim() ? undefined : "Model ID is required"),
+    })
+  ).trim();
+
+  let compatibility: CustomApiCompatibility | null =
+    compatibilityChoice === "unknown" ? null : compatibilityChoice;
+  let providerApi =
+    COMPATIBILITY_OPTIONS.find((entry) => entry.value === compatibility)?.api ??
+    "openai-completions";
+
+  while (true) {
+    let verifiedFromProbe = false;
+    if (!compatibility) {
+      const probeSpinner = prompter.progress("Detecting endpoint type...");
+      const openaiProbe = await requestOpenAiVerification({ baseUrl, apiKey, modelId });
+      if (openaiProbe.ok) {
+        probeSpinner.stop("Detected OpenAI-compatible endpoint.");
+        compatibility = "openai";
+        providerApi = "openai-completions";
+        verifiedFromProbe = true;
+      } else {
+        const anthropicProbe = await requestAnthropicVerification({ baseUrl, apiKey, modelId });
+        if (anthropicProbe.ok) {
+          probeSpinner.stop("Detected Anthropic-compatible endpoint.");
+          compatibility = "anthropic";
+          providerApi = "anthropic-messages";
+          verifiedFromProbe = true;
+        } else {
+          probeSpinner.stop("Could not detect endpoint type.");
+          await prompter.note(
+            "This endpoint did not respond to OpenAI or Anthropic style requests.",
+            "Endpoint detection",
+          );
+          const retryChoice = await prompter.select({
+            message: "What would you like to change?",
+            options: [
+              { value: "baseUrl", label: "Change base URL" },
+              { value: "model", label: "Change model" },
+              { value: "both", label: "Change base URL and model" },
+            ],
+          });
+          if (retryChoice === "baseUrl" || retryChoice === "both") {
+            const retryInput = await promptBaseUrlAndKey({
+              prompter,
+              initialBaseUrl: baseUrl,
+            });
+            baseUrl = retryInput.baseUrl;
+            apiKey = retryInput.apiKey;
+          }
+          if (retryChoice === "model" || retryChoice === "both") {
+            modelId = (
+              await prompter.text({
+                message: "Model ID",
+                placeholder: "e.g. llama3, claude-3-7-sonnet",
+                validate: (val) => (val.trim() ? undefined : "Model ID is required"),
+              })
+            ).trim();
+          }
+          continue;
+        }
+      }
+    }
+
+    if (verifiedFromProbe) {
+      break;
+    }
+
+    const verifySpinner = prompter.progress("Verifying...");
+    const result =
+      compatibility === "anthropic"
+        ? await requestAnthropicVerification({ baseUrl, apiKey, modelId })
+        : await requestOpenAiVerification({ baseUrl, apiKey, modelId });
+    if (result.ok) {
+      verifySpinner.stop("Verification successful.");
+      break;
+    }
+    if (result.status !== undefined) {
+      verifySpinner.stop(`Verification failed: status ${result.status}`);
+    } else {
+      verifySpinner.stop(`Verification failed: ${formatVerificationError(result.error)}`);
+    }
+    const retryChoice = await prompter.select({
+      message: "What would you like to change?",
+      options: [
+        { value: "baseUrl", label: "Change base URL" },
+        { value: "model", label: "Change model" },
+        { value: "both", label: "Change base URL and model" },
+      ],
+    });
+    if (retryChoice === "baseUrl" || retryChoice === "both") {
+      const retryInput = await promptBaseUrlAndKey({
+        prompter,
+        initialBaseUrl: baseUrl,
+      });
+      baseUrl = retryInput.baseUrl;
+      apiKey = retryInput.apiKey;
+    }
+    if (retryChoice === "model" || retryChoice === "both") {
+      modelId = (
+        await prompter.text({
+          message: "Model ID",
+          placeholder: "e.g. llama3, claude-3-7-sonnet",
+          validate: (val) => (val.trim() ? undefined : "Model ID is required"),
+        })
+      ).trim();
+    }
+    if (compatibilityChoice === "unknown") {
+      compatibility = null;
+    }
+  }
+
+  const providers = config.models?.providers ?? {};
+  const suggestedId = buildEndpointIdFromUrl(baseUrl);
+  const providerIdInput = await prompter.text({
+    message: "Endpoint ID",
+    initialValue: suggestedId,
+    placeholder: "custom",
+    validate: (value) => {
+      const normalized = normalizeEndpointId(value);
+      if (!normalized) {
+        return "Endpoint ID is required.";
+      }
+      return undefined;
+    },
+  });
+  const providerIdResult = resolveUniqueEndpointId({
+    requestedId: providerIdInput,
+    baseUrl,
+    providers,
+  });
+  if (providerIdResult.renamed) {
+    await prompter.note(
+      `Endpoint ID "${providerIdInput}" already exists for a different base URL. Using "${providerIdResult.providerId}".`,
+      "Endpoint ID",
+    );
+  }
+  const providerId = providerIdResult.providerId;
+
+  const modelRef = modelKey(providerId, modelId);
+  const aliasInput = await prompter.text({
+    message: "Model alias (optional)",
+    placeholder: "e.g. local, ollama",
+    initialValue: "",
+    validate: (value) => resolveAliasError({ raw: value, cfg: config, modelRef }),
+  });
+  const alias = aliasInput.trim();
+
+  const existingProvider = providers[providerId];
+  const existingModels = Array.isArray(existingProvider?.models) ? existingProvider.models : [];
+  const hasModel = existingModels.some((model) => model.id === modelId);
+  const nextModel = {
+    id: modelId,
+    name: `${modelId} (Custom API)`,
+    contextWindow: DEFAULT_CONTEXT_WINDOW,
+    maxTokens: DEFAULT_MAX_TOKENS,
+    input: ["text"] as ["text"],
+    cost: { input: 0, output: 0, cacheRead: 0, cacheWrite: 0 },
+    reasoning: false,
+  };
+  const mergedModels = hasModel ? existingModels : [...existingModels, nextModel];
+  const { apiKey: existingApiKey, ...existingProviderRest } = existingProvider ?? {};
+  const normalizedApiKey = apiKey.trim() || (existingApiKey ? existingApiKey.trim() : undefined);
+
+  let newConfig: OpenClawConfig = {
+    ...config,
+    models: {
+      ...config.models,
+      mode: config.models?.mode ?? "merge",
+      providers: {
+        ...providers,
+        [providerId]: {
+          ...existingProviderRest,
+          baseUrl,
+          api: providerApi,
+          ...(normalizedApiKey ? { apiKey: normalizedApiKey } : {}),
+          models: mergedModels.length > 0 ? mergedModels : [nextModel],
+        },
+      },
+    },
+  };
+
+  newConfig = applyPrimaryModel(newConfig, modelRef);
+  if (alias) {
+    newConfig = {
+      ...newConfig,
+      agents: {
+        ...newConfig.agents,
+        defaults: {
+          ...newConfig.agents?.defaults,
+          models: {
+            ...newConfig.agents?.defaults?.models,
+            [modelRef]: {
+              ...newConfig.agents?.defaults?.models?.[modelRef],
+              alias,
+            },
+          },
+        },
+      },
+    };
+  }
+
+  runtime.log(`Configured custom provider: ${providerId}/${modelId}`);
+  return { config: newConfig, providerId, modelId };
+}
diff --git a/src/commands/onboard-types.ts b/src/commands/onboard-types.ts
index 9405795837..f24fd3079c 100644
--- a/src/commands/onboard-types.ts
+++ b/src/commands/onboard-types.ts
@@ -38,7 +38,27 @@ export type AuthChoice =
   | "qwen-portal"
   | "xai-api-key"
   | "qianfan-api-key"
+  | "custom-api-key"
   | "skip";
+export type AuthChoiceGroupId =
+  | "openai"
+  | "anthropic"
+  | "google"
+  | "copilot"
+  | "openrouter"
+  | "ai-gateway"
+  | "cloudflare-ai-gateway"
+  | "moonshot"
+  | "zai"
+  | "xiaomi"
+  | "opencode-zen"
+  | "minimax"
+  | "synthetic"
+  | "venice"
+  | "qwen"
+  | "qianfan"
+  | "xai"
+  | "custom";
 export type GatewayAuthChoice = "token" | "password";
 export type ResetScope = "config" | "config+creds+sessions" | "full";
 export type GatewayBind = "loopback" | "lan" | "auto" | "custom" | "tailnet";
diff --git a/src/wizard/onboarding.ts b/src/wizard/onboarding.ts
index e5cab60f6f..91f1e967fe 100644
--- a/src/wizard/onboarding.ts
+++ b/src/wizard/onboarding.ts
@@ -18,6 +18,7 @@ import {
 } from "../commands/auth-choice.js";
 import { applyPrimaryModel, promptDefaultModel } from "../commands/model-picker.js";
 import { setupChannels } from "../commands/onboard-channels.js";
+import { promptCustomApiConfig } from "../commands/onboard-custom.js";
 import {
   applyWizardMetadata,
   DEFAULT_WORKSPACE,
@@ -378,26 +379,38 @@ export async function runOnboardingWizard(
       includeSkip: true,
     }));
 
-  const authResult = await applyAuthChoice({
-    authChoice,
-    config: nextConfig,
-    prompter,
-    runtime,
-    setDefaultModel: true,
-    opts: {
-      tokenProvider: opts.tokenProvider,
-      token: opts.authChoice === "apiKey" && opts.token ? opts.token : undefined,
-    },
-  });
-  nextConfig = authResult.config;
+  let customPreferredProvider: string | undefined;
+  if (authChoice === "custom-api-key") {
+    const customResult = await promptCustomApiConfig({
+      prompter,
+      runtime,
+      config: nextConfig,
+    });
+    nextConfig = customResult.config;
+    customPreferredProvider = customResult.providerId;
+  } else {
+    const authResult = await applyAuthChoice({
+      authChoice,
+      config: nextConfig,
+      prompter,
+      runtime,
+      setDefaultModel: true,
+      opts: {
+        tokenProvider: opts.tokenProvider,
+        token: opts.authChoice === "apiKey" && opts.token ? opts.token : undefined,
+      },
+    });
+    nextConfig = authResult.config;
+  }
 
-  if (authChoiceFromPrompt) {
+  if (authChoiceFromPrompt && authChoice !== "custom-api-key") {
     const modelSelection = await promptDefaultModel({
       config: nextConfig,
       prompter,
       allowKeep: true,
       ignoreAllowlist: true,
-      preferredProvider: resolvePreferredProviderForAuthChoice(authChoice),
+      preferredProvider:
+        customPreferredProvider ?? resolvePreferredProviderForAuthChoice(authChoice),
     });
     if (modelSelection.model) {
       nextConfig = applyPrimaryModel(nextConfig, modelSelection.model);