diff --git a/packages/ai/src/provider-error.ts b/packages/ai/src/provider-error.ts
index 9f405873249..5659d0df587 100644
--- a/packages/ai/src/provider-error.ts
+++ b/packages/ai/src/provider-error.ts
@@ -40,7 +40,8 @@ const patterns = [
   /context[_ ]length[_ ]exceeded/i,
   /context length is only \d+ tokens/i,
   /input length.*exceeds.*context length/i,
-  /prompt too long; exceeded (?:max )?context length/i,
+  // Z.ai code 1261 arrives as `Prompt too long` or `Prompt 超长`.
+  /prompt (?:too long|超长)/i,
   /too large for model with \d+ maximum context length/i,
   /prompt has [\d,]+ tokens?, but the configured context size is [\d,]+ tokens?/i,
   /model_context_window_exceeded/i,
@@ -156,13 +157,15 @@ const GATEWAY_CODE_LABEL = /^[^:\n]+: \[([A-Za-z0-9_.-]+)\]/
 const AUTH_TEXT = /incorrect api key provided/i
 const RATE_LIMIT_TEXT = /rate increased too quickly|rate[-_\s]?limit|too[_\s]?many[_\s]?requests/i
 // Only consulted on 429, where throttles and account caps share a status.
-const QUOTA_TEXT = /insufficient[-_\s]?quota|quota[-_\s]?exceeded|budget exceeded|usage limit/i
+// Z.ai reports balance, plan expiry, plan limits, and plan model access on 429.
+const QUOTA_TEXT =
+  /insufficient[-_\s]?(?:quota|balance)|quota[-_\s]?exceeded|budget exceeded|usage limit|limit exhausted|package has expired|plan does not yet include/i
 // Policy rejections without a dedicated code, matched against the provider's own
 // explanation only. OpenAI reuses `invalid_prompt` for usage-policy rejections while
 // Bedrock Mantle reuses it for schema validation; Anthropic reports blocked output
 // under `invalid_request_error`.
 const CONTENT_POLICY_TEXT =
-  /violating our usage policy|blocked by content filtering policy|content[-_\s]?policy|rejected as a result of our safety system/i
+  /violating our usage policy|blocked by content filtering policy|content[-_\s]?policy|rejected as a result of our safety system|detected potentially unsafe or sensitive content/i
 const SERVER_ERROR_TEXT =
   /\b(?:try again|(?:please |you can )?retry (?:the |this |your )?request|try (?:the |this |your )?request again|(?:currently |temporarily )?at capacity|overloaded|temporarily unavailable|service[-_\s]?unavailable|(?:server|internal)[-_\s]?error|server (?:is )?busy|provider returned (?:an )?error|resource[-_\s]?exhausted|upstream (?:connect|connection|request)|request buffer limit while retrying upstream)\b/i
 
diff --git a/packages/ai/test/provider-error.test.ts b/packages/ai/test/provider-error.test.ts
index f3a86dfdce8..44d7e5fdc12 100644
--- a/packages/ai/test/provider-error.test.ts
+++ b/packages/ai/test/provider-error.test.ts
@@ -284,6 +284,82 @@ describe("provider error classification", () => {
     ).toEqual(Array(6).fill("QuotaExceeded"))
   })
 
+  test("classifies Z.ai plan and balance limits as quota rather than throttling", () => {
+    const zai = (code: string, message: string) => ({ error: { code, message } })
+    const cases = [
+      zai("1113", "Insufficient balance or no resource package. Please recharge."),
+      zai("1308", "Usage limit reached for 5 hours. Your limit will reset at 2026-10-01 00:00:00"),
+      zai(
+        "1309",
+        "Your GLM Coding Plan package has expired and is temporarily unavailable. You can resume using it after renewing the subscription on the official website.",
+      ),
+      zai("1310", "Weekly/Monthly Limit Exhausted. Your limit will reset at 2026-10-01 00:00:00"),
+      zai("1311", "Your current subscription plan does not yet include access to glm-5"),
+      zai("1314", "Your enterprise package has expired. Please contact your enterprise administrator."),
+      // Z.ai's Anthropic-compatible endpoint wraps the code and request ID into the message.
+      {
+        type: "error",
+        error: {
+          type: "rate_limit_error",
+          code: "1309",
+          message:
+            "[1309][Your GLM Coding Plan package has expired and is temporarily unavailable. You can resume using it after renewing the subscription on the official website.][20260929132151e73af01340d54b58]",
+        },
+      },
+    ]
+    expect(
+      cases.map(
+        (body) =>
+          classifyProviderFailure({ message: body.error.message, status: 429, rawBody: JSON.stringify(body) })._tag,
+      ),
+    ).toEqual(Array(cases.length).fill("QuotaExceeded"))
+  })
+
+  test("classifies Z.ai prompt length rejections as context overflow", () => {
+    const cases = [
+      { error: { code: "1261", message: "Prompt 超长" } },
+      { error: { code: "1261", message: "Prompt too long" } },
+      {
+        type: "error",
+        error: { type: "invalid_request_error", code: "1261", message: "[1261][Prompt too long][2026092913]" },
+      },
+    ]
+    expect(
+      cases.map((body) => {
+        const reason = classifyProviderFailure({
+          message: body.error.message,
+          status: 400,
+          rawBody: JSON.stringify(body),
+        })
+        return reason._tag === "InvalidRequest" ? reason.classification : reason._tag
+      }),
+    ).toEqual(["context-overflow", "context-overflow", "context-overflow"])
+  })
+
+  test("classifies Z.ai sensitive content rejections as content policy", () => {
+    const message =
+      "System detected potentially unsafe or sensitive content in input or generation. Please avoid using prompts that may generate sensitive content. Thank you for your cooperation."
+    expect(
+      classifyProviderFailure({
+        message,
+        status: 400,
+        rawBody: JSON.stringify({ error: { code: "1301", message } }),
+      })._tag,
+    ).toBe("ContentPolicy")
+  })
+
+  test("keeps Z.ai throttling and overload retryable", () => {
+    expect(
+      [
+        { error: { code: "1302", message: "Rate limit reached for requests" } },
+        { error: { code: "1305", message: "The service may be temporarily overloaded, please try again later" } },
+      ].map(
+        (body) =>
+          classifyProviderFailure({ message: body.error.message, status: 429, rawBody: JSON.stringify(body) })._tag,
+      ),
+    ).toEqual(["RateLimit", "RateLimit"])
+  })
+
   test("does not let substituted server codes make a 4xx retryable", () => {
     const openai = { error: { type: "server_error", message: "Upstream request failed: Model is unavailable." } }
     const anthropic = {