diff --git a/open-sse/services/usage.ts b/open-sse/services/usage.ts
index 8711e00c89..1f3cade0f6 100644
--- a/open-sse/services/usage.ts
+++ b/open-sse/services/usage.ts
@@ -88,6 +88,16 @@ const NANOGPT_CONFIG = {
   usageUrl: "https://nano-gpt.com/api/subscription/v1/usage",
 };
 
+const OPENCODE_GO_QUOTA_URL =
+  process.env.OMNIROUTE_OPENCODE_GO_QUOTA_URL ?? "https://api.z.ai/api/monitor/usage/quota/limit";
+const OPENCODE_GO_QUOTA_TOTALS = {
+  session: 12,
+  weekly: 30,
+  mcp_monthly: 60,
+} as const;
+const OPENCODE_GO_QUOTA_ORDER = ["session", "weekly", "mcp_monthly"] as const;
+type OpenCodeGoQuotaName = (typeof OPENCODE_GO_QUOTA_ORDER)[number];
+
 // Cursor dashboard usage API config
 // The endpoint that powers https://cursor.com/dashboard/spending. Validates the WorkOS
 // session via the WorkosCursorSessionToken cookie (format: `${userId}::${jwt}`) and
@@ -198,6 +208,76 @@ function getGlmQuotaDisplayName(quotaName: string): string {
   return quotaName;
 }
 
+function getOpenCodeGoTokenQuotaName(
+  limit: JsonRecord,
+  existingQuotas: Record<string, UsageQuota>
+): "session" | "weekly" {
+  const unit = toNumber(limit.unit, 0);
+  const number = toNumber(limit.number, 0);
+
+  if (unit === 3 && number === 5) return "session";
+  if (unit === 6 && number === 1) return "weekly";
+  if ((unit === 4 && number === 7) || (unit === 3 && number >= 24 * 7)) return "weekly";
+
+  return existingQuotas.session ? "weekly" : "session";
+}
+
+function getOpenCodeGoQuotaDisplayName(quotaName: OpenCodeGoQuotaName): string {
+  if (quotaName === "session") return "5-hour rolling";
+  if (quotaName === "weekly") return "Weekly";
+  return "Monthly";
+}
+
+function normalizeOpenCodeGoQuotaToken(apiKey: string): string {
+  return apiKey.trim().replace(/^Bearer\s+/i, "");
+}
+
+function buildOpenCodeGoDollarQuota(
+  quotaName: OpenCodeGoQuotaName,
+  percentage: unknown,
+  resetAt: string | null,
+  usedOverride?: unknown,
+  details?: UsageQuota["details"]
+): UsageQuota {
+  const total = OPENCODE_GO_QUOTA_TOTALS[quotaName];
+  const percentUsed = toPercentage(percentage);
+  const rawUsed = toNumber(usedOverride, Number.NaN);
+  const used = roundCurrency(
+    Number.isFinite(rawUsed) ? Math.max(0, Math.min(total, rawUsed)) : (total * percentUsed) / 100
+  );
+  const remaining = roundCurrency(Math.max(0, total - used));
+  const remainingPercentage =
+    total > 0
+      ? clampPercentage(Math.round((remaining / total) * 100))
+      : clampPercentage(100 - percentUsed);
+
+  return {
+    used,
+    total,
+    remaining,
+    remainingPercentage,
+    resetAt,
+    unlimited: false,
+    displayName: getOpenCodeGoQuotaDisplayName(quotaName),
+    currency: "USD",
+    details,
+  };
+}
+
+function orderOpenCodeGoQuotas(quotas: Record<string, UsageQuota>): Record<string, UsageQuota> {
+  const ordered: Record<string, UsageQuota> = {};
+
+  for (const key of OPENCODE_GO_QUOTA_ORDER) {
+    if (quotas[key]) ordered[key] = quotas[key];
+  }
+
+  for (const [key, quota] of Object.entries(quotas)) {
+    if (!ordered[key]) ordered[key] = quota;
+  }
+
+  return ordered;
+}
+
 function getFieldValue(source: unknown, snakeKey: string, camelKey: string): unknown {
   const obj = toRecord(source);
   return obj[snakeKey] ?? obj[camelKey] ?? null;
@@ -207,6 +287,10 @@ function clampPercentage(value: number): number {
   return Math.max(0, Math.min(100, value));
 }
 
+function roundCurrency(value: number): number {
+  return Math.round(value * 100) / 100;
+}
+
 function toDisplayLabel(value: string): string {
   return value
     .replace(/^copilot[_\s-]*/i, "")
@@ -788,6 +872,98 @@ async function getGlmUsage(apiKey: string, providerSpecificData?: Record<string,
   return { plan, quotas: orderGlmQuotas(quotas) };
 }
 
+async function getOpenCodeGoUsage(apiKey: string) {
+  const token = normalizeOpenCodeGoQuotaToken(apiKey);
+
+  if (!token) {
+    return { message: "API key not available. Add an OpenCode Go API key to view usage." };
+  }
+
+  const res = await fetch(OPENCODE_GO_QUOTA_URL, {
+    headers: {
+      Authorization: token,
+      "Accept-Language": "en-US,en",
+      "Content-Type": "application/json",
+      Accept: "application/json",
+    },
+  });
+
+  if (!res.ok) {
+    if (res.status === 401 || res.status === 403) throw new Error("Invalid OpenCode Go API key");
+    throw new Error(`OpenCode Go quota API error (${res.status})`);
+  }
+
+  const json = await res.json();
+  const code = toNumber(json.code, 200);
+  if (code === 401 || code === 403 || json.success === false) {
+    throw new Error("Invalid OpenCode Go API key");
+  }
+
+  const data = toRecord(json.data);
+  const limits: unknown[] = Array.isArray(data.limits) ? data.limits : [];
+  const quotas: Record<string, UsageQuota> = {};
+
+  for (const limit of limits) {
+    const src = toRecord(limit);
+    const type = String(src.type || "").toUpperCase();
+    const resetAt = parseResetTime(src.nextResetTime);
+
+    if (type === "TOKENS_LIMIT" || type === "TOKEN_LIMIT") {
+      const quotaName = getOpenCodeGoTokenQuotaName(src, quotas);
+
+      quotas[quotaName] = buildOpenCodeGoDollarQuota(
+        quotaName,
+        src.percentage,
+        resetAt,
+        undefined,
+        Array.isArray(src.models)
+          ? (src.models as unknown[]).map((model) => {
+              const modelInfo = toRecord(model);
+              return {
+                name: String(modelInfo.model || modelInfo.modelCode || "usage"),
+                used: toNumber(modelInfo.percentage, 0),
+              };
+            })
+          : undefined
+      );
+      continue;
+    }
+
+    if (type === "TIME_LIMIT" || type === "TIME_USAGE_LIMIT") {
+      quotas.mcp_monthly = buildOpenCodeGoDollarQuota(
+        "mcp_monthly",
+        src.percentage,
+        resetAt,
+        src.currentValue,
+        Array.isArray(src.usageDetails)
+          ? src.usageDetails.map((item) => {
+              const detail = toRecord(item);
+              return {
+                name: String(detail.modelCode || detail.name || "usage"),
+                used: toNumber(detail.usage, 0),
+              };
+            })
+          : undefined
+      );
+    }
+  }
+
+  const levelRaw =
+    typeof data.planName === "string"
+      ? data.planName
+      : typeof data.level === "string"
+        ? data.level
+        : "";
+  const planLabel = toTitleCase(levelRaw.replace(/\s*plan$/i, ""));
+  const plan = planLabel
+    ? /^opencode\s+go\b/i.test(planLabel)
+      ? planLabel
+      : `OpenCode Go ${planLabel}`
+    : null;
+
+  return { plan, quotas: orderOpenCodeGoQuotas(quotas) };
+}
+
 /**
  * Bailian (Alibaba Coding Plan) Usage
  * Fetches triple-window quota (5h, weekly, monthly) and returns worst-case.
@@ -1184,6 +1360,7 @@ export const USAGE_FETCHER_PROVIDERS = [
   "glm-cn",
   "zai",
   "glmt",
+  "opencode-go",
   "minimax",
   "minimax-cn",
   "crof",
@@ -1238,6 +1415,8 @@ export async function getUsageForProvider(
         ...(providerSpecificData || {}),
         ...(provider === "glm-cn" ? { apiRegion: "china" } : {}),
       });
+    case "opencode-go":
+      return await getOpenCodeGoUsage(apiKey || "");
     case "minimax":
     case "minimax-cn":
       return await getMiniMaxUsage(apiKey || "", provider);
diff --git a/src/app/(dashboard)/dashboard/usage/components/ProviderLimits/index.tsx b/src/app/(dashboard)/dashboard/usage/components/ProviderLimits/index.tsx
index bc653f92f5..bc03e281d9 100644
--- a/src/app/(dashboard)/dashboard/usage/components/ProviderLimits/index.tsx
+++ b/src/app/(dashboard)/dashboard/usage/components/ProviderLimits/index.tsx
@@ -41,6 +41,7 @@ const PROVIDER_LABEL: Record<string, string> = {
   glm: "GLM (Z.AI)",
   zai: "Z.AI",
   glmt: "GLM Thinking",
+  "opencode-go": "OpenCode Go",
   "kimi-coding": "Kimi Coding",
   minimax: "MiniMax",
   "minimax-cn": "MiniMax CN",
@@ -60,10 +61,11 @@ const PROVIDER_ORDER: Record<string, number> = {
   glm: 7,
   zai: 8,
   glmt: 9,
-  "kimi-coding": 10,
-  minimax: 11,
-  "minimax-cn": 12,
-  nanogpt: 13,
+  "opencode-go": 10,
+  "kimi-coding": 11,
+  minimax: 12,
+  "minimax-cn": 13,
+  nanogpt: 14,
 };
 
 const TIER_FILTERS = [
diff --git a/src/app/(dashboard)/dashboard/usage/components/ProviderLimits/utils.tsx b/src/app/(dashboard)/dashboard/usage/components/ProviderLimits/utils.tsx
index 7620f5302c..4579ecfd22 100644
--- a/src/app/(dashboard)/dashboard/usage/components/ProviderLimits/utils.tsx
+++ b/src/app/(dashboard)/dashboard/usage/components/ProviderLimits/utils.tsx
@@ -246,6 +246,7 @@ export function parseQuotaData(provider, data) {
       case "glm":
       case "glm-cn":
       case "glmt":
+      case "opencode-go":
         if (data.quotas) {
           Object.entries(data.quotas).forEach(([name, quota]: [string, any]) => {
             normalizedQuotas.push(
@@ -403,7 +404,12 @@ export function parseQuotaData(provider, data) {
     });
   }
 
-  if (providerId === "glm" || providerId === "glm-cn" || providerId === "glmt") {
+  if (
+    providerId === "glm" ||
+    providerId === "glm-cn" ||
+    providerId === "glmt" ||
+    providerId === "opencode-go"
+  ) {
     normalizedQuotas.sort((a, b) => {
       const orderA = GLM_QUOTA_ORDER[a.name] ?? 99;
       const orderB = GLM_QUOTA_ORDER[b.name] ?? 99;
diff --git a/src/lib/usage/providerLimits.ts b/src/lib/usage/providerLimits.ts
index 0d13b0a38e..ac12edb201 100644
--- a/src/lib/usage/providerLimits.ts
+++ b/src/lib/usage/providerLimits.ts
@@ -53,6 +53,7 @@ const PROVIDER_LIMITS_APIKEY_PROVIDERS = new Set([
   "glm-cn",
   "zai",
   "glmt",
+  "opencode-go",
   "minimax",
   "minimax-cn",
   "crof",
diff --git a/src/shared/constants/providers.ts b/src/shared/constants/providers.ts
index e55ab7a95f..e2a5da13ce 100644
--- a/src/shared/constants/providers.ts
+++ b/src/shared/constants/providers.ts
@@ -2890,6 +2890,7 @@ export const USAGE_SUPPORTED_PROVIDERS = [
   "glm-cn",
   "zai",
   "glmt",
+  "opencode-go",
   "minimax",
   "minimax-cn",
   "crof",
diff --git a/tests/unit/generic-quota-fetcher.test.ts b/tests/unit/generic-quota-fetcher.test.ts
index f8c219fc43..3cfa62d8e1 100644
--- a/tests/unit/generic-quota-fetcher.test.ts
+++ b/tests/unit/generic-quota-fetcher.test.ts
@@ -76,12 +76,13 @@ test("convertUsageToQuotaInfo clamps remainingPercentage outside 0-100", () => {
   assert.equal(result!.windows!.b.percentUsed, 1);
 });
 
-test("registerGenericQuotaFetchers registers Claude and GLM via the generic adapter", () => {
+test("registerGenericQuotaFetchers registers Claude, GLM, and OpenCode Go via the generic adapter", () => {
   registerGenericQuotaFetchers();
   // Claude has no bespoke fetcher → should be registered.
   assert.ok(getQuotaFetcher("claude"), "claude should be registered");
   assert.ok(getQuotaFetcher("glm"), "glm should be registered");
   assert.ok(getQuotaFetcher("zai"), "zai should be registered");
+  assert.ok(getQuotaFetcher("opencode-go"), "opencode-go should be registered");
   // Codex has its own dedicated fetcher (registered by codexQuotaFetcher.ts,
   // not by the generic registrar) — the generic registrar skips it. We can't
   // assert "codex" here without first calling registerCodexQuotaFetcher,
diff --git a/tests/unit/opencode-go-usage.test.ts b/tests/unit/opencode-go-usage.test.ts
new file mode 100644
index 0000000000..63f6fefdd4
--- /dev/null
+++ b/tests/unit/opencode-go-usage.test.ts
@@ -0,0 +1,156 @@
+import test from "node:test";
+import assert from "node:assert/strict";
+
+const usage = await import("../../open-sse/services/usage.ts");
+const { USAGE_SUPPORTED_PROVIDERS } = await import("../../src/shared/constants/providers.ts");
+
+test("USAGE_SUPPORTED_PROVIDERS includes opencode-go", () => {
+  assert.ok(
+    (USAGE_SUPPORTED_PROVIDERS as string[]).includes("opencode-go"),
+    "opencode-go must be in the usage-supported providers allowlist"
+  );
+});
+
+test("getUsageForProvider returns helpful message when opencode-go has no apiKey", async () => {
+  let called = false;
+  const originalFetch = globalThis.fetch;
+  globalThis.fetch = async () => {
+    called = true;
+    return new Response("unexpected", { status: 500 });
+  };
+
+  try {
+    const result = (await usage.getUsageForProvider({
+      id: "opencode-go-no-key",
+      provider: "opencode-go",
+      apiKey: "",
+    })) as { message?: string };
+
+    assert.equal(called, false, "quota fetch must not run without an API key");
+    assert.match(result.message ?? "", /OpenCode Go/);
+  } finally {
+    globalThis.fetch = originalFetch;
+  }
+});
+
+test("getUsageForProvider exposes OpenCode Go 5h, weekly, and monthly quotas", async () => {
+  const originalFetch = globalThis.fetch;
+  const reset5h = Date.now() + 2 * 60 * 60 * 1000;
+  const resetWeekly = Date.now() + 4 * 24 * 60 * 60 * 1000;
+  const resetMonthly = Date.now() + 20 * 24 * 60 * 60 * 1000;
+  let requestUrl = "";
+  let requestHeaders: Headers | null = null;
+
+  globalThis.fetch = async (input, init) => {
+    requestUrl = String(input);
+    requestHeaders = new Headers(init?.headers as HeadersInit | undefined);
+
+    return new Response(
+      JSON.stringify({
+        code: 200,
+        success: true,
+        data: {
+          level: "pro",
+          limits: [
+            {
+              type: "TOKENS_LIMIT",
+              unit: 3,
+              number: 5,
+              percentage: 25,
+              nextResetTime: reset5h,
+            },
+            {
+              type: "TOKENS_LIMIT",
+              unit: 6,
+              number: 1,
+              percentage: 50,
+              nextResetTime: resetWeekly,
+            },
+            {
+              type: "TIME_LIMIT",
+              percentage: 10,
+              currentValue: 6,
+              usage: 60,
+              nextResetTime: resetMonthly,
+              usageDetails: [{ modelCode: "search-prime", usage: 3 }],
+            },
+          ],
+        },
+      }),
+      { status: 200, headers: { "content-type": "application/json" } }
+    );
+  };
+
+  try {
+    const result = (await usage.getUsageForProvider({
+      id: "opencode-go-usage",
+      provider: "opencode-go",
+      apiKey: "Bearer opencode-go-key",
+    })) as {
+      plan?: string | null;
+      quotas?: Record<
+        string,
+        {
+          used: number;
+          total: number;
+          remaining: number;
+          remainingPercentage: number;
+          resetAt: string | null;
+          displayName?: string;
+          currency?: string;
+          details?: Array<{ name: string; used: number }>;
+        }
+      >;
+    };
+
+    assert.equal(requestUrl, "https://api.z.ai/api/monitor/usage/quota/limit");
+    assert.equal(requestHeaders?.get("Authorization"), "opencode-go-key");
+    assert.equal(requestHeaders?.get("Content-Type"), "application/json");
+    assert.equal(result.plan, "OpenCode Go Pro");
+    assert.deepEqual(Object.keys(result.quotas ?? {}), ["session", "weekly", "mcp_monthly"]);
+
+    assert.equal(result.quotas!.session.displayName, "5-hour rolling");
+    assert.equal(result.quotas!.session.currency, "USD");
+    assert.equal(result.quotas!.session.used, 3);
+    assert.equal(result.quotas!.session.total, 12);
+    assert.equal(result.quotas!.session.remaining, 9);
+    assert.equal(result.quotas!.session.remainingPercentage, 75);
+    assert.equal(result.quotas!.session.resetAt, new Date(reset5h).toISOString());
+
+    assert.equal(result.quotas!.weekly.displayName, "Weekly");
+    assert.equal(result.quotas!.weekly.used, 15);
+    assert.equal(result.quotas!.weekly.total, 30);
+    assert.equal(result.quotas!.weekly.remaining, 15);
+    assert.equal(result.quotas!.weekly.remainingPercentage, 50);
+    assert.equal(result.quotas!.weekly.resetAt, new Date(resetWeekly).toISOString());
+
+    assert.equal(result.quotas!.mcp_monthly.displayName, "Monthly");
+    assert.equal(result.quotas!.mcp_monthly.used, 6);
+    assert.equal(result.quotas!.mcp_monthly.total, 60);
+    assert.equal(result.quotas!.mcp_monthly.remaining, 54);
+    assert.equal(result.quotas!.mcp_monthly.remainingPercentage, 90);
+    assert.equal(result.quotas!.mcp_monthly.resetAt, new Date(resetMonthly).toISOString());
+    assert.deepEqual(result.quotas!.mcp_monthly.details, [{ name: "search-prime", used: 3 }]);
+  } finally {
+    globalThis.fetch = originalFetch;
+  }
+});
+
+test("getUsageForProvider rejects invalid OpenCode Go API keys", async () => {
+  const originalFetch = globalThis.fetch;
+  globalThis.fetch = async () => new Response("nope", { status: 401 });
+
+  try {
+    await assert.rejects(
+      () =>
+        usage.getUsageForProvider({
+          id: "opencode-go-401",
+          provider: "opencode-go",
+          apiKey: "bad-key",
+        }),
+      /Invalid OpenCode Go API key/
+    );
+  } finally {
+    globalThis.fetch = originalFetch;
+  }
+});