diff --git a/open-sse/config/providerRegistry.ts b/open-sse/config/providerRegistry.ts
index b441fd8251..41eeaebfe0 100644
--- a/open-sse/config/providerRegistry.ts
+++ b/open-sse/config/providerRegistry.ts
@@ -4318,6 +4318,92 @@ const _REGISTRY_EAGER: Record<string, RegistryEntry> = {
     ],
   },
 
+  zenmux: {
+    id: "zenmux",
+    alias: "zm",
+    format: "openai",
+    executor: "default",
+    baseUrl: "https://zenmux.ai/api/v1/chat/completions",
+    modelsUrl: "https://zenmux.ai/api/v1/models",
+    authType: "apikey",
+    authHeader: "bearer",
+    defaultContextLength: 128000,
+    models: [
+      {
+        id: "google/gemini-3.1-pro-preview",
+        name: "Gemini 3.1 Pro Preview (ZenMux)",
+        contextLength: 1048576,
+        supportsVision: true,
+        toolCalling: true,
+        supportsReasoning: true,
+      },
+      {
+        id: "google/gemini-3-flash-preview",
+        name: "Gemini 3 Flash Preview (ZenMux)",
+        contextLength: 1048576,
+        supportsVision: true,
+        toolCalling: true,
+        supportsReasoning: true,
+      },
+      {
+        id: "openai/gpt-5",
+        name: "GPT-5 (ZenMux)",
+        contextLength: 400000,
+        supportsVision: true,
+        toolCalling: true,
+        supportsReasoning: true,
+      },
+      {
+        id: "anthropic/claude-sonnet-4.5",
+        name: "Claude Sonnet 4.5 (ZenMux)",
+        contextLength: 200000,
+        supportsVision: true,
+        toolCalling: true,
+        supportsReasoning: true,
+      },
+      {
+        id: "anthropic/claude-opus-4.5",
+        name: "Claude Opus 4.5 (ZenMux)",
+        contextLength: 200000,
+        supportsVision: true,
+        toolCalling: true,
+        supportsReasoning: true,
+      },
+      {
+        id: "deepseek/deepseek-chat",
+        name: "DeepSeek V3.2 Chat (ZenMux)",
+        contextLength: 128000,
+        supportsVision: false,
+        toolCalling: true,
+        supportsReasoning: false,
+      },
+      {
+        id: "x-ai/grok-4.1-fast",
+        name: "Grok 4.1 Fast (ZenMux)",
+        contextLength: 131072,
+        supportsVision: false,
+        toolCalling: true,
+        supportsReasoning: true,
+      },
+      {
+        id: "mistralai/mistral-large-2512",
+        name: "Mistral Large 2512 (ZenMux)",
+        contextLength: 128000,
+        supportsVision: true,
+        toolCalling: true,
+        supportsReasoning: false,
+      },
+      {
+        id: "z-ai/glm-4.6v-flash",
+        name: "GLM 4.6V Flash (ZenMux)",
+        contextLength: 128000,
+        supportsVision: true,
+        toolCalling: true,
+        supportsReasoning: false,
+      },
+    ],
+  },
+
   theoldllm: {
     id: "theoldllm",
     alias: "tllm",
diff --git a/src/shared/constants/config.ts b/src/shared/constants/config.ts
index 85a93070a1..32a86de86d 100644
--- a/src/shared/constants/config.ts
+++ b/src/shared/constants/config.ts
@@ -29,6 +29,7 @@ export const PROVIDER_ENDPOINTS = {
   minimax: "https://api.minimax.io/anthropic/v1/messages",
   "minimax-cn": "https://api.minimaxi.com/anthropic/v1/messages",
   crof: "https://crof.ai/v1/chat/completions",
+  zenmux: "https://zenmux.ai/api/v1/chat/completions",
   openai: "https://api.openai.com/v1/chat/completions",
   anthropic: "https://api.anthropic.com/v1/messages",
   gemini: "https://generativelanguage.googleapis.com/v1beta/models",
diff --git a/src/shared/constants/providers.ts b/src/shared/constants/providers.ts
index 67df2b560a..de54566eee 100644
--- a/src/shared/constants/providers.ts
+++ b/src/shared/constants/providers.ts
@@ -2284,6 +2284,22 @@ export const APIKEY_PROVIDERS = {
     apiHint:
       "Discounted API proxy for 40+ models including GPT-5, Claude Opus 4.6, Claude Sonnet 4.6, Qwen 3.5. Get your API key at https://freeaiapikey.com/dashboard. Base URL: https://freeaiapikey.com/v1.",
   },
+  zenmux: {
+    id: "zenmux",
+    alias: "zm",
+    name: "ZenMux",
+    icon: "neurology",
+    color: "#7C3AED",
+    textIcon: "ZM",
+    website: "https://zenmux.ai",
+    hasFree: true,
+    freeNote:
+      "Free tier includes access to Gemini 3 Flash, DeepSeek V3.2, Grok 4.1 Fast, Mistral Large, and more. Get your API key at https://zenmux.ai.",
+    authHint:
+      "Use your ZenMux API key in Authorization: Bearer <key>. ZenMux is fully OpenAI-compatible. Base URL: https://zenmux.ai/api/v1.",
+    apiHint:
+      "ZenMux exposes an OpenAI-compatible chat completions endpoint at /api/v1/chat/completions, plus Anthropic Messages (/api/anthropic/v1/messages) and Google Gemini (/api/vertex-ai) protocol surfaces. OmniRoute uses the OpenAI protocol.",
+  },
 };
 
 // Sub-categories within APIKEY_PROVIDERS (used by dashboard and catalog views).
diff --git a/tests/unit/zenmux-provider.test.ts b/tests/unit/zenmux-provider.test.ts
new file mode 100644
index 0000000000..1fd54b9320
--- /dev/null
+++ b/tests/unit/zenmux-provider.test.ts
@@ -0,0 +1,67 @@
+import test from "node:test";
+import assert from "node:assert/strict";
+
+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");
+
+test("ZenMux is registered as an API-key provider with the canonical identity", () => {
+  const zenmux = APIKEY_PROVIDERS.zenmux;
+  assert.ok(zenmux, "APIKEY_PROVIDERS.zenmux must be defined");
+  assert.equal(zenmux.id, "zenmux");
+  assert.equal(zenmux.alias, "zm");
+  assert.equal(zenmux.name, "ZenMux");
+  assert.equal(zenmux.website, "https://zenmux.ai");
+  assert.equal(typeof zenmux.textIcon, "string");
+  assert.equal(zenmux.hasFree, true);
+});
+
+test("ZenMux exposes the OpenAI-compatible chat completions URL", () => {
+  assert.equal(
+    PROVIDER_ENDPOINTS.zenmux,
+    "https://zenmux.ai/api/v1/chat/completions"
+  );
+});
+
+test("ZenMux registry entry uses OpenAI format with bearer apikey auth", () => {
+  const entry = providerRegistry.zenmux;
+  assert.ok(entry, "providerRegistry.zenmux must be defined");
+  assert.equal(entry.id, "zenmux");
+  assert.equal(entry.alias, "zm");
+  assert.equal(entry.format, "openai");
+  assert.equal(entry.executor, "default");
+  assert.equal(entry.authType, "apikey");
+  assert.equal(entry.authHeader, "bearer");
+  assert.equal(entry.baseUrl, "https://zenmux.ai/api/v1/chat/completions");
+  assert.equal(entry.modelsUrl, "https://zenmux.ai/api/v1/models");
+});
+
+test("ZenMux seed model list includes the headline families and unique ids", () => {
+  const models = providerRegistry.zenmux.models;
+  const ids = models.map((m: { id: string }) => m.id);
+  assert.ok(ids.length >= 8, "expect a non-trivial seed list of 8+ models");
+  assert.equal(new Set(ids).size, ids.length, "model ids must be unique");
+  // Provider-prefixed family coverage matching ZenMux's multi-protocol router
+  for (const family of [
+    "google/gemini-3",
+    "openai/gpt-5",
+    "anthropic/claude-sonnet",
+    "deepseek/deepseek",
+    "x-ai/grok-",
+    "mistralai/mistral",
+  ]) {
+    assert.ok(
+      ids.some((id: string) => id.startsWith(family)),
+      `seed list must include ${family}* model`
+    );
+  }
+});
+
+test("ZenMux models use provider/model naming convention", () => {
+  for (const model of providerRegistry.zenmux.models) {
+    assert.ok(
+      model.id.includes("/"),
+      `model id "${model.id}" must follow provider/model format (e.g. google/gemini-3.1-pro-preview)`
+    );
+  }
+});