diff --git a/open-sse/config/providers/index.ts b/open-sse/config/providers/index.ts
index a36b2ce99b..662dd552fc 100644
--- a/open-sse/config/providers/index.ts
+++ b/open-sse/config/providers/index.ts
@@ -1,6 +1,8 @@
 import type { RegistryEntry } from "./shared.ts";
 
 import { aimlapiProvider } from "./registry/aimlapi/index.ts";
+import { byteplusProvider } from "./registry/byteplus/index.ts";
+import { mimocodeProvider } from "./registry/mimocode/index.ts";
 import { ollama_cloudProvider } from "./registry/ollama-cloud/index.ts";
 import { syntheticProvider } from "./registry/synthetic/index.ts";
 import { ideogramProvider } from "./registry/ideogram/index.ts";
@@ -320,4 +322,6 @@ export const REGISTRY: Record<string, RegistryEntry> = {
   codex: codexProvider,
   venice: veniceProvider,
   kiro: kiroProvider,
+  byteplus: byteplusProvider,
+  mimocode: mimocodeProvider,
 };
diff --git a/open-sse/config/providers/registry/byteplus/index.ts b/open-sse/config/providers/registry/byteplus/index.ts
new file mode 100644
index 0000000000..2acadce50a
--- /dev/null
+++ b/open-sse/config/providers/registry/byteplus/index.ts
@@ -0,0 +1,21 @@
+import type { RegistryEntry } from "../../shared.ts";
+
+// BytePlus ModelArk (Ark) — OpenAI-compatible, ap-southeast-1 region, Bearer auth.
+// Re-added after the registry modularization (#3993) dropped it; restores #3877.
+export const byteplusProvider: RegistryEntry = {
+  id: "byteplus",
+  alias: "bpm",
+  format: "openai",
+  executor: "default",
+  baseUrl: "https://ark.ap-southeast.bytepluses.com/api/v3/chat/completions",
+  modelsUrl: "https://ark.ap-southeast.bytepluses.com/api/v3/models",
+  authType: "apikey",
+  authHeader: "bearer",
+  defaultContextLength: 128000,
+  models: [
+    { id: "seed-2.0", name: "Seed 2.0" },
+    { id: "kimi-k2-thinking", name: "Kimi K2 Thinking", supportsReasoning: true },
+    { id: "glm-4.7", name: "GLM 4.7" },
+    { id: "gpt-oss-120b", name: "GPT-OSS-120B" },
+  ],
+};
diff --git a/open-sse/config/providers/registry/mimocode/index.ts b/open-sse/config/providers/registry/mimocode/index.ts
new file mode 100644
index 0000000000..39023831c9
--- /dev/null
+++ b/open-sse/config/providers/registry/mimocode/index.ts
@@ -0,0 +1,16 @@
+import type { RegistryEntry } from "../../shared.ts";
+import { CHAT_OPENAI_COMPAT_MODELS } from "../../shared.ts";
+
+// Mimocode (Xiaomi MiMo free OpenAI-compatible gateway) — no-auth, custom executor.
+// Re-added after the registry modularization (#3993) dropped it; restores #3837.
+export const mimocodeProvider: RegistryEntry = {
+  id: "mimocode",
+  alias: "mcode",
+  format: "openai",
+  executor: "mimocode",
+  baseUrl: "https://api.xiaomimimo.com",
+  chatPath: "/api/free-ai/openai/chat",
+  authType: "none",
+  authHeader: "none",
+  models: CHAT_OPENAI_COMPAT_MODELS["mimocode"],
+};
diff --git a/tests/unit/provider-validation-specialty.test.ts b/tests/unit/provider-validation-specialty.test.ts
index af8255ba02..8d0faa9ec4 100644
--- a/tests/unit/provider-validation-specialty.test.ts
+++ b/tests/unit/provider-validation-specialty.test.ts
@@ -2655,7 +2655,10 @@ test("qwen-web validator probes /api/v2/user (not /api/v2/models) and returns va
   globalThis.fetch = async (url, init = {}) => {
     probedUrl = String(url);
     sentHeaders = toPlainHeaders(init.headers);
-    return new Response(JSON.stringify({ data: { id: "u-1", name: "Tester" } }), {
+    // Qwen's /api/v2/user returns a real user object for a valid session. Since
+    // #3958 the validator inspects the body for `user` (Qwen answers 200 even for
+    // invalid tokens), so a valid response must carry one.
+    return new Response(JSON.stringify({ user: { id: "u-1", name: "Tester" } }), {
       status: 200,
       headers: { "content-type": "application/json" },
     });