diff --git a/CHANGELOG.md b/CHANGELOG.md
index c095a17d62..93384f8bfa 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -22,6 +22,7 @@
 - **feat(providers):** add Augment (Auggie CLI) as a local no-auth provider. (thanks @chamdanilukman)
 - **feat(providers):** add ModelScope as an OpenAI-compatible (API-key) provider. (thanks @tn5052)
 - **feat(providers):** add Qiniu as an OpenAI-compatible (API-key) provider. (thanks @JackChiang233)
+- **feat(providers):** add b.ai as an OpenAI-compatible (API-key) provider. (thanks @DEYLNN)
 
 ### 🔧 Bug Fixes
 
diff --git a/open-sse/config/providers/index.ts b/open-sse/config/providers/index.ts
index 17eb23d21b..25ec4911c1 100644
--- a/open-sse/config/providers/index.ts
+++ b/open-sse/config/providers/index.ts
@@ -41,6 +41,7 @@ import { yiProvider } from "./registry/yi/index.ts";
 import { deepseekProvider } from "./registry/deepseek/index.ts";
 import { deepseek_webProvider } from "./registry/deepseek/web/index.ts";
 import { dgridProvider } from "./registry/dgrid/index.ts";
+import { baiProvider } from "./registry/bai/index.ts";
 import { qiniuProvider } from "./registry/qiniu/index.ts";
 import { kimi_coding_apikeyProvider } from "./registry/kimi/coding-apikey/index.ts";
 import { kimi_codingProvider } from "./registry/kimi/coding/index.ts";
@@ -216,6 +217,7 @@ export const REGISTRY: Record<string, RegistryEntry> = {
   deepseek: deepseekProvider,
   "deepseek-web": deepseek_webProvider,
   dgrid: dgridProvider,
+  bai: baiProvider,
   qiniu: qiniuProvider,
   "kimi-coding-apikey": kimi_coding_apikeyProvider,
   "kimi-coding": kimi_codingProvider,
diff --git a/open-sse/config/providers/registry/bai/index.ts b/open-sse/config/providers/registry/bai/index.ts
new file mode 100644
index 0000000000..574362693c
--- /dev/null
+++ b/open-sse/config/providers/registry/bai/index.ts
@@ -0,0 +1,14 @@
+import type { RegistryEntry } from "../../shared.ts";
+
+export const baiProvider: RegistryEntry = {
+  id: "bai",
+  alias: "bai",
+  format: "openai",
+  executor: "default",
+  baseUrl: "https://api.b.ai/v1/chat/completions",
+  authType: "apikey",
+  authHeader: "bearer",
+  modelsUrl: "https://api.b.ai/v1/models",
+  models: [],
+  passthroughModels: true,
+};
diff --git a/src/app/api/providers/[id]/models/discovery/providerSets.ts b/src/app/api/providers/[id]/models/discovery/providerSets.ts
index 338a036386..4bf76ecb19 100644
--- a/src/app/api/providers/[id]/models/discovery/providerSets.ts
+++ b/src/app/api/providers/[id]/models/discovery/providerSets.ts
@@ -56,6 +56,10 @@ export const NAMED_OPENAI_STYLE_PROVIDERS = new Set([
   // DGrid is an OpenAI-compatible gateway whose default seed is the free auto-router;
   // the full model catalog is discovered live from https://api.dgrid.ai/v1/models.
   "dgrid",
+  // b.ai is an OpenAI-compatible LLM gateway with no static seed — it proxies many
+  // upstream models (GPT, Claude, Gemini, MiniMax, Kimi, GLM...) behind one key, so the
+  // full catalog is discovered live from https://api.b.ai/v1/models.
+  "bai",
   // Qiniu (七牛云 AI inference) is an OpenAI-compatible gateway with no static seed —
   // it proxies many upstream models (DeepSeek, Claude, Kimi...) behind one key, so the
   // full catalog is discovered live from https://api.qnaigc.com/v1/models.
diff --git a/src/shared/constants/config.ts b/src/shared/constants/config.ts
index 96d13b9482..6271c744bc 100644
--- a/src/shared/constants/config.ts
+++ b/src/shared/constants/config.ts
@@ -5,6 +5,7 @@ export const PROVIDER_ENDPOINTS = {
   agentrouter: "https://agentrouter.org/v1/chat/completions",
   openrouter: "https://openrouter.ai/api/v1/chat/completions",
   dgrid: "https://api.dgrid.ai/v1/chat/completions",
+  bai: "https://api.b.ai/v1/chat/completions",
   qiniu: "https://api.qnaigc.com/v1/chat/completions",
   glm: "https://api.z.ai/api/anthropic/v1/messages",
   glmt: "https://api.z.ai/api/anthropic/v1/messages",
diff --git a/src/shared/constants/providers/apikey/gateways.ts b/src/shared/constants/providers/apikey/gateways.ts
index 27e1d38fb7..27ef167735 100644
--- a/src/shared/constants/providers/apikey/gateways.ts
+++ b/src/shared/constants/providers/apikey/gateways.ts
@@ -407,6 +407,19 @@ export const APIKEY_PROVIDERS_GATEWAYS = {
     authHint: "Bearer API key for the TheB.AI OpenAI-compatible gateway.",
     passthroughModels: true,
   },
+  bai: {
+    id: "bai",
+    alias: "bai",
+    name: "b.ai",
+    icon: "hub",
+    color: "#6366F1",
+    textIcon: "BA",
+    website: "https://b.ai",
+    authHint:
+      "Bearer API key for the b.ai OpenAI-compatible LLM gateway (distinct from TheB.AI). " +
+      "Create a key at https://docs.b.ai, then use https://api.b.ai/v1 as the OpenAI-compatible base URL.",
+    passthroughModels: true,
+  },
   fenayai: {
     id: "fenayai",
     alias: "fenayai",
diff --git a/tests/snapshots/provider/translate-path.json b/tests/snapshots/provider/translate-path.json
index f22206dc0c..2ddaed3633 100644
--- a/tests/snapshots/provider/translate-path.json
+++ b/tests/snapshots/provider/translate-path.json
@@ -312,6 +312,29 @@
       "stream": "auggie://cli/stdio"
     }
   },
+  "bai": {
+    "format": "openai",
+    "headers": {
+      "apiKey": {
+        "Accept": "text/event-stream",
+        "Authorization": "Bearer <TOK>",
+        "Content-Type": "application/json"
+      },
+      "nonStream": {
+        "Authorization": "Bearer <TOK>",
+        "Content-Type": "application/json"
+      },
+      "oauth": {
+        "Accept": "text/event-stream",
+        "Authorization": "Bearer <TOK>",
+        "Content-Type": "application/json"
+      }
+    },
+    "url": {
+      "nonStream": "https://api.b.ai/v1/chat/completions",
+      "stream": "https://api.b.ai/v1/chat/completions"
+    }
+  },
   "baichuan": {
     "format": "openai",
     "headers": {
diff --git a/tests/unit/bai-provider.test.ts b/tests/unit/bai-provider.test.ts
new file mode 100644
index 0000000000..3669d53998
--- /dev/null
+++ b/tests/unit/bai-provider.test.ts
@@ -0,0 +1,159 @@
+import test from "node:test";
+import assert from "node:assert/strict";
+import fs from "node:fs";
+import os from "node:os";
+import path from "node:path";
+
+const { APIKEY_PROVIDERS } = await import("../../src/shared/constants/providers.ts");
+const { PROVIDER_ENDPOINTS } = await import("../../src/shared/constants/config.ts");
+const { REGISTRY: providerRegistry } = await import("../../open-sse/config/providerRegistry.ts");
+const { isValidModel } = await import("../../src/shared/constants/models.ts");
+
+const BAI_CHAT_URL = "https://api.b.ai/v1/chat/completions";
+const BAI_MODELS_URL = "https://api.b.ai/v1/models";
+
+test("b.ai is registered as an API-key provider", () => {
+  const entry = APIKEY_PROVIDERS.bai;
+  assert.ok(entry, "APIKEY_PROVIDERS.bai must be defined");
+  assert.equal(entry.id, "bai");
+  assert.equal(entry.alias, "bai");
+  assert.equal(entry.name, "b.ai");
+  assert.equal(entry.website, "https://b.ai");
+  assert.equal(entry.passthroughModels, true);
+});
+
+test("b.ai is distinct from the existing thebai (TheB.AI) provider", () => {
+  const bai = APIKEY_PROVIDERS.bai;
+  const thebai = APIKEY_PROVIDERS.thebai;
+  assert.ok(bai, "APIKEY_PROVIDERS.bai must be defined");
+  assert.ok(thebai, "APIKEY_PROVIDERS.thebai must be defined");
+  assert.notEqual(bai.id, thebai.id);
+  assert.notEqual(bai.website, thebai.website);
+  assert.equal(bai.website, "https://b.ai");
+  assert.equal(thebai.website, "https://theb.ai");
+});
+
+test("b.ai exposes the OpenAI-compatible chat completions endpoint", () => {
+  assert.equal(PROVIDER_ENDPOINTS.bai, BAI_CHAT_URL);
+});
+
+test("b.ai registry entry uses OpenAI format with bearer API-key auth", () => {
+  const entry = providerRegistry.bai;
+  assert.ok(entry, "providerRegistry.bai must be defined");
+  assert.equal(entry.id, "bai");
+  assert.equal(entry.alias, "bai");
+  assert.equal(entry.format, "openai");
+  assert.equal(entry.executor, "default");
+  assert.equal(entry.authType, "apikey");
+  assert.equal(entry.authHeader, "bearer");
+  assert.equal(entry.baseUrl, BAI_CHAT_URL);
+  assert.equal(entry.modelsUrl, BAI_MODELS_URL);
+  assert.equal(entry.passthroughModels, true);
+});
+
+test("b.ai ships no static model seed — relies fully on passthrough + live catalog", () => {
+  const models = providerRegistry.bai.models;
+  assert.deepEqual(models, []);
+});
+
+test("b.ai accepts any model id via passthrough models (GPT/Claude/Gemini/Kimi/GLM behind one key)", () => {
+  assert.equal(isValidModel("bai", "gpt-5.2"), true);
+  assert.equal(isValidModel("bai", "claude-opus-4-5"), true);
+  assert.equal(isValidModel("bai", "gemini-3-pro"), true);
+  assert.equal(isValidModel("bai", "kimi-k2.5"), true);
+});
+
+const TEST_DATA_DIR = fs.mkdtempSync(path.join(os.tmpdir(), "omniroute-bai-"));
+process.env.DATA_DIR = TEST_DATA_DIR;
+
+const core = await import("../../src/lib/db/core.ts");
+const providersDb = await import("../../src/lib/db/providers.ts");
+const modelsRoute = await import("../../src/app/api/providers/[id]/models/route.ts");
+
+async function resetStorage() {
+  core.resetDbInstance();
+  fs.rmSync(TEST_DATA_DIR, { recursive: true, force: true });
+  fs.mkdirSync(TEST_DATA_DIR, { recursive: true });
+}
+
+test.after(() => {
+  core.resetDbInstance();
+  fs.rmSync(TEST_DATA_DIR, { recursive: true, force: true });
+});
+
+interface ModelsBody {
+  provider: string;
+  connectionId: string;
+  models: Array<{ id: string }>;
+  source?: string;
+}
+
+test("b.ai import fetches the live /v1/models catalog", async () => {
+  await resetStorage();
+  const connection = await providersDb.createProviderConnection({
+    provider: "bai",
+    authType: "apikey",
+    name: "bai-live",
+    apiKey: "bai-key",
+  });
+
+  let fetched = false;
+  const originalFetch = globalThis.fetch;
+  globalThis.fetch = async (url) => {
+    if (String(url) === BAI_MODELS_URL) {
+      fetched = true;
+      return Response.json({
+        object: "list",
+        data: [{ id: "gpt-5.2" }, { id: "claude-opus-4-5" }, { id: "kimi-k2.5" }],
+      });
+    }
+    return new Response("not found", { status: 404 });
+  };
+
+  try {
+    const response = await modelsRoute.GET(
+      new Request(`http://localhost/api/providers/${connection.id}/models?refresh=true`),
+      { params: { id: connection.id } }
+    );
+    assert.equal(response.status, 200);
+    const body = (await response.json()) as ModelsBody;
+    assert.equal(body.provider, "bai");
+    assert.equal(body.source, "api", "should serve the live upstream catalog");
+    assert.ok(fetched, `should have probed ${BAI_MODELS_URL}`);
+    const ids = body.models.map((model) => model.id);
+    assert.ok(ids.includes("gpt-5.2"), `live catalog model missing: ${ids.join(",")}`);
+    assert.ok(ids.includes("kimi-k2.5"), `live catalog model missing: ${ids.join(",")}`);
+  } finally {
+    globalThis.fetch = originalFetch;
+  }
+});
+
+test("b.ai import falls back to an empty local catalog when live fetch fails", async () => {
+  await resetStorage();
+  const connection = await providersDb.createProviderConnection({
+    provider: "bai",
+    authType: "apikey",
+    name: "bai-fallback",
+    apiKey: "bai-key-2",
+  });
+
+  const originalFetch = globalThis.fetch;
+  globalThis.fetch = async () => new Response("bad gateway", { status: 502 });
+
+  try {
+    const response = await modelsRoute.GET(
+      new Request(`http://localhost/api/providers/${connection.id}/models?refresh=true`),
+      { params: { id: connection.id } }
+    );
+    assert.equal(response.status, 200);
+    const body = (await response.json()) as ModelsBody;
+    assert.equal(body.provider, "bai");
+    assert.equal(body.source, "local_catalog", "import must not break when upstream is down");
+    assert.deepEqual(
+      body.models.map((model) => model.id),
+      []
+    );
+  } finally {
+    globalThis.fetch = originalFetch;
+  }
+});
diff --git a/tests/unit/providers-constants-split.test.ts b/tests/unit/providers-constants-split.test.ts
index 355d323879..4a17769f26 100644
--- a/tests/unit/providers-constants-split.test.ts
+++ b/tests/unit/providers-constants-split.test.ts
@@ -1,7 +1,7 @@
 // Characterization of the providers.ts catalog split (god-file decomposition): the host became a
 // barrel that re-exports 10 data catalogs now living under constants/providers/*, and APIKEY is
 // merged from 6 semantic family files (apikey/<family>.ts). Locks: the public surface (every catalog
-// + helpers still exported), the spread-merge integrity (161 APIKEY entries, no loss/dup), and that
+// + helpers still exported), the spread-merge integrity (162 APIKEY entries, no loss/dup), and that
 // load-time Zod validation still runs. Pure-data move → behavior must be identical.
 import { test } from "node:test";
 import assert from "node:assert/strict";
@@ -31,12 +31,12 @@ test("barrel still exports every catalog + key helpers", () => {
   }
 });
 
-test("APIKEY_PROVIDERS merges the 6 family files into 161 entries (no loss / no dup)", async () => {
+test("APIKEY_PROVIDERS merges the 6 family files into 162 entries (no loss / no dup)", async () => {
   const keys = Object.keys((P as Record<string, object>).APIKEY_PROVIDERS);
-  assert.equal(keys.length, 161);
-  assert.equal(new Set(keys).size, 161, "duplicate keys after spread-merge");
+  assert.equal(keys.length, 162);
+  assert.equal(new Set(keys).size, 162, "duplicate keys after spread-merge");
   // the merged object's entry-count equals the sum of the 6 semantic family files; families are a
-  // strict partition (every provider in exactly one), so the sum must be exactly 161.
+  // strict partition (every provider in exactly one), so the sum must be exactly 162.
   const families: [string, string][] = [
     ["gateways", "APIKEY_PROVIDERS_GATEWAYS"],
     ["frontier-labs", "APIKEY_PROVIDERS_FRONTIER"],
@@ -56,7 +56,7 @@ test("APIKEY_PROVIDERS merges the 6 family files into 161 entries (no loss / no
       seen.add(k);
     }
   }
-  assert.equal(famTotal, 161, "families must partition all 161 providers");
+  assert.equal(famTotal, 162, "families must partition all 162 providers");
 });
 
 test("AI_PROVIDERS Proxy aggregates all sections; lookups resolve", () => {