diff --git a/packages/core/src/observability/raw-trace-sync.ts b/packages/core/src/observability/raw-trace-sync.ts
index 16a8ad34..02b5f0ed 100644
--- a/packages/core/src/observability/raw-trace-sync.ts
+++ b/packages/core/src/observability/raw-trace-sync.ts
@@ -1022,12 +1022,7 @@ async function writeDurableJsonFile(
   const filePath = join(directory, fileName);
   const temporaryPath = join(directory, `.${fileName}-${randomUUID()}.tmp`);
   await writeFile(temporaryPath, JSON.stringify(value));
-  const temporaryFile = await open(temporaryPath, "r");
-  try {
-    await temporaryFile.sync();
-  } finally {
-    await temporaryFile.close();
-  }
+  await syncFile(temporaryPath);
   await rename(temporaryPath, filePath);
   await syncDirectory(directory);
 }
@@ -1049,14 +1044,7 @@ async function syncRawTracePartFiles(
       throw new Error(`Raw trace part is shorter than its manifest: ${filePath}`);
     }
     if (syncPartFile) await syncPartFile(filePath);
-    else {
-      const handle = await open(filePath, "r");
-      try {
-        await handle.sync();
-      } finally {
-        await handle.close();
-      }
-    }
+    else await syncFile(filePath);
   }
   await syncDirectory(directory);
 }
@@ -1096,14 +1084,47 @@ async function readRawTraceDeliveryState(
   };
 }
 
+// Windows maps fsync to FlushFileBuffers, which requires the handle to carry
+// write access: flushing a handle opened read-only fails with EPERM. Every
+// file flushed here was just written by this process, so reopening it as "r+"
+// keeps the barrier real on Windows instead of trading it for a tolerated
+// error. POSIX accepts a read-write handle for fsync just as readily.
+async function syncFile(filePath: string): Promise<void> {
+  const handle = await open(filePath, "r+");
+  try {
+    await handle.sync();
+  } finally {
+    await handle.close();
+  }
+}
+
+// Flushing a directory entry is a best-effort durability barrier: POSIX never
+// required it to succeed, and platforms are free to reject the request. Linux
+// and macOS answer with EINVAL/ENOTSUP/EISDIR depending on the filesystem;
+// Windows rejects fsync on a directory handle with EPERM. All of those mean
+// "this platform will not flush a directory", not "this spool is broken", so
+// the rename that precedes the call still stands and we continue. Any other
+// code (EACCES, EIO, ENOSPC, EBADF, ...) is a real storage failure and must
+// keep propagating, so the caller can refuse the bundle instead of reporting a
+// durability guarantee it never obtained.
+const toleratedDirectorySyncErrorCodes = new Set(["EINVAL", "EISDIR", "ENOTSUP", "EPERM"]);
+
+function isToleratedDirectorySyncError(error: unknown): boolean {
+  const code = nodeErrorCode(error);
+  return code !== undefined && toleratedDirectorySyncErrorCodes.has(code);
+}
+
+export function isToleratedDirectorySyncErrorForTest(error: unknown): boolean {
+  return isToleratedDirectorySyncError(error);
+}
+
 async function syncDirectory(directory: string): Promise<void> {
   let handle;
   try {
     handle = await open(directory, "r");
     await handle.sync();
   } catch (error) {
-    const code = nodeErrorCode(error);
-    if (code !== "EINVAL" && code !== "ENOTSUP" && code !== "EISDIR") throw error;
+    if (!isToleratedDirectorySyncError(error)) throw error;
   } finally {
     await handle?.close().catch(() => undefined);
   }
diff --git a/packages/core/src/providers/presets/index.ts b/packages/core/src/providers/presets/index.ts
index 2663f753..f1cf4ba6 100644
--- a/packages/core/src/providers/presets/index.ts
+++ b/packages/core/src/providers/presets/index.ts
@@ -18,6 +18,12 @@ import { runApiProviderPreset } from "@ccr/core/providers/presets/runapi/index";
 import { siliconFlowProviderPreset } from "@ccr/core/providers/presets/siliconflow/index";
 import { teamoRouterProviderPreset } from "@ccr/core/providers/presets/teamorouter/index";
 import { unity2ProviderPreset } from "@ccr/core/providers/presets/unity2/index";
+import {
+  xiaomiMimoProviderPreset,
+  xiaomiMimoTokenPlanChinaProviderPreset,
+  xiaomiMimoTokenPlanEuropeProviderPreset,
+  xiaomiMimoTokenPlanSingaporeProviderPreset
+} from "@ccr/core/providers/presets/xiaomi/index";
 import { zaiGlobalCodingProviderPreset } from "@ccr/core/providers/presets/zai-global-coding/index";
 import { zaiGlobalGeneralProviderPreset } from "@ccr/core/providers/presets/zai-global-general/index";
 import { zhipuCnCodingProviderPreset } from "@ccr/core/providers/presets/zhipu-cn-coding/index";
@@ -40,6 +46,10 @@ export const providerPresets: ProviderPreset[] = [
   openRouterProviderPreset,
   nvidiaProviderPreset,
   deepSeekProviderPreset,
+  xiaomiMimoProviderPreset,
+  xiaomiMimoTokenPlanChinaProviderPreset,
+  xiaomiMimoTokenPlanSingaporeProviderPreset,
+  xiaomiMimoTokenPlanEuropeProviderPreset,
   kimiCodingProviderPreset,
   zhipuCnCodingProviderPreset,
   zhipuCnGeneralProviderPreset,
diff --git a/packages/core/src/providers/presets/xiaomi/index.ts b/packages/core/src/providers/presets/xiaomi/index.ts
new file mode 100644
index 00000000..4e897207
--- /dev/null
+++ b/packages/core/src/providers/presets/xiaomi/index.ts
@@ -0,0 +1,65 @@
+import { defaultProviderAccountConfig, type ProviderPreset } from "@ccr/core/providers/presets/types";
+
+const xiaomiMimoDefaultModels = ["mimo-v2.5-pro", "mimo-v2.5"];
+const xiaomiMimoWebsiteUrl = "https://platform.xiaomimimo.com/";
+
+function createXiaomiMimoProviderPreset(input: {
+  aliases: string[];
+  anthropicBaseUrl: string;
+  id: string;
+  name: string;
+  openAiBaseUrl: string;
+}): ProviderPreset {
+  return {
+    account: defaultProviderAccountConfig,
+    aliases: input.aliases,
+    defaultModels: xiaomiMimoDefaultModels,
+    endpoints: [
+      {
+        baseUrl: input.openAiBaseUrl,
+        label: "OpenAI",
+        protocols: ["openai_responses", "openai_chat_completions"]
+      },
+      {
+        baseUrl: input.anthropicBaseUrl,
+        label: "Anthropic",
+        protocols: ["anthropic_messages"]
+      }
+    ],
+    id: input.id,
+    name: input.name,
+    websiteUrl: xiaomiMimoWebsiteUrl
+  };
+}
+
+export const xiaomiMimoProviderPreset = createXiaomiMimoProviderPreset({
+  aliases: ["mimo", "xiaomi", "xiaomi mimo", "小米", "小米 mimo"],
+  anthropicBaseUrl: "https://api.xiaomimimo.com/anthropic",
+  id: "xiaomi",
+  name: "Xiaomi MiMo",
+  openAiBaseUrl: "https://api.xiaomimimo.com/v1"
+});
+
+export const xiaomiMimoTokenPlanChinaProviderPreset = createXiaomiMimoProviderPreset({
+  aliases: ["mimo token plan china", "xiaomi token plan china", "xiaomi token plan cn"],
+  anthropicBaseUrl: "https://token-plan-cn.xiaomimimo.com/anthropic",
+  id: "xiaomi-token-plan-cn",
+  name: "Xiaomi Token Plan (China)",
+  openAiBaseUrl: "https://token-plan-cn.xiaomimimo.com/v1"
+});
+
+export const xiaomiMimoTokenPlanSingaporeProviderPreset = createXiaomiMimoProviderPreset({
+  aliases: ["mimo token plan singapore", "xiaomi token plan singapore", "xiaomi token plan sgp"],
+  anthropicBaseUrl: "https://token-plan-sgp.xiaomimimo.com/anthropic",
+  id: "xiaomi-token-plan-sgp",
+  name: "Xiaomi Token Plan (Singapore)",
+  openAiBaseUrl: "https://token-plan-sgp.xiaomimimo.com/v1"
+});
+
+export const xiaomiMimoTokenPlanEuropeProviderPreset = createXiaomiMimoProviderPreset({
+  aliases: ["mimo token plan europe", "xiaomi token plan ams", "xiaomi token plan europe"],
+  anthropicBaseUrl: "https://token-plan-ams.xiaomimimo.com/anthropic",
+  id: "xiaomi-token-plan-ams",
+  name: "Xiaomi Token Plan (Europe)",
+  openAiBaseUrl: "https://token-plan-ams.xiaomimimo.com/v1"
+});
diff --git a/packages/core/test/unit/observability/raw-trace-sync.test.mjs b/packages/core/test/unit/observability/raw-trace-sync.test.mjs
index 21786925..0ff38e1b 100644
--- a/packages/core/test/unit/observability/raw-trace-sync.test.mjs
+++ b/packages/core/test/unit/observability/raw-trace-sync.test.mjs
@@ -11,6 +11,7 @@ import {
   applyRawTraceRequestLogPolicy,
   buildRawTraceConfig,
   createBodySampler,
+  isToleratedDirectorySyncErrorForTest,
   readRawTraceRequestLogBundle,
   RawTraceSynchronizer
 } from "@ccr/core/observability/raw-trace-sync.ts";
@@ -874,6 +875,48 @@ test("fallback raw bundles keep unique bundle ids while sharing the logical requ
   }
 });
 
+// A real directory handle cannot drive these cases: on Linux and macOS the
+// fsync either succeeds or fails with a code that depends on the filesystem
+// under the temp directory, and on Windows it always fails. The predicate is
+// the only place where the platform-independent contract can be pinned down.
+test("raw trace tolerates every directory fsync rejection a platform may return", () => {
+  // Node rejects fsync on a directory handle with EPERM on Windows
+  // (errno -4048, verified on Node 24.14.1 win32) and with EINVAL, ENOTSUP or
+  // EISDIR across POSIX filesystems. Flushing a directory is a best-effort
+  // barrier, so none of these may fail the spool.
+  for (const code of ["EINVAL", "EISDIR", "ENOTSUP", "EPERM"]) {
+    assert.equal(
+      isToleratedDirectorySyncErrorForTest(directorySyncError(code)),
+      true,
+      `expected a directory fsync ${code} to be tolerated`
+    );
+  }
+});
+
+test("raw trace still propagates real storage failures from a directory fsync", () => {
+  // The tolerated set must stay a set. If it ever degrades into a blanket
+  // catch, an unwritable or failing spool would be acknowledged as durable.
+  for (const code of ["EACCES", "EIO", "ENOSPC", "EROFS", "EBADF", "EMFILE"]) {
+    assert.equal(
+      isToleratedDirectorySyncErrorForTest(directorySyncError(code)),
+      false,
+      `expected a directory fsync ${code} to keep propagating`
+    );
+  }
+  assert.equal(isToleratedDirectorySyncErrorForTest(new Error("fsync failed")), false);
+  assert.equal(isToleratedDirectorySyncErrorForTest(directorySyncError("")), false);
+  assert.equal(isToleratedDirectorySyncErrorForTest(undefined), false);
+});
+
+function directorySyncError(code) {
+  // Shaped like the rejection Node produces for fsync on a directory handle,
+  // e.g. "EPERM: operation not permitted, fsync" on Windows.
+  const error = new Error(`${code}: directory fsync rejected, fsync`);
+  error.code = code;
+  error.syscall = "fsync";
+  return error;
+}
+
 function createConfig() {
   const config = createDefaultAppConfig();
   config.observability.requestLogs = true;
diff --git a/packages/core/test/unit/providers/provider-preset-utils.test.mjs b/packages/core/test/unit/providers/provider-preset-utils.test.mjs
index 0cc9535a..daea37e5 100644
--- a/packages/core/test/unit/providers/provider-preset-utils.test.mjs
+++ b/packages/core/test/unit/providers/provider-preset-utils.test.mjs
@@ -37,6 +37,12 @@ import {
 import {
   unity2ProviderPreset
 } from "@ccr/core/providers/presets/unity2/index.ts";
+import {
+  xiaomiMimoProviderPreset,
+  xiaomiMimoTokenPlanChinaProviderPreset,
+  xiaomiMimoTokenPlanEuropeProviderPreset,
+  xiaomiMimoTokenPlanSingaporeProviderPreset
+} from "@ccr/core/providers/presets/xiaomi/index.ts";
 
 const openAiPreset = {
   aliases: ["OpenAI", "ChatGPT"],
@@ -140,6 +146,50 @@ test("NVIDIA preset exposes the hosted NIM OpenAI-compatible endpoint", () => {
   assert.equal(providerPresetMatchesBaseUrl(nvidiaProviderPreset, "https://build.nvidia.com/models"), false);
 });
 
+test("Xiaomi MiMo presets expose official Responses, Chat, and Anthropic endpoints", () => {
+  const cases = [
+    [
+      xiaomiMimoProviderPreset,
+      "https://api.xiaomimimo.com/v1",
+      "https://api.xiaomimimo.com/anthropic"
+    ],
+    [
+      xiaomiMimoTokenPlanChinaProviderPreset,
+      "https://token-plan-cn.xiaomimimo.com/v1",
+      "https://token-plan-cn.xiaomimimo.com/anthropic"
+    ],
+    [
+      xiaomiMimoTokenPlanSingaporeProviderPreset,
+      "https://token-plan-sgp.xiaomimimo.com/v1",
+      "https://token-plan-sgp.xiaomimimo.com/anthropic"
+    ],
+    [
+      xiaomiMimoTokenPlanEuropeProviderPreset,
+      "https://token-plan-ams.xiaomimimo.com/v1",
+      "https://token-plan-ams.xiaomimimo.com/anthropic"
+    ]
+  ];
+
+  for (const [preset, openAiBaseUrl, anthropicBaseUrl] of cases) {
+    assert.equal(providerPresets.find((candidate) => candidate.id === preset.id), preset);
+    assert.deepEqual(preset.defaultModels, ["mimo-v2.5-pro", "mimo-v2.5"]);
+    assert.deepEqual(preset.endpoints, [
+      {
+        baseUrl: openAiBaseUrl,
+        label: "OpenAI",
+        protocols: ["openai_responses", "openai_chat_completions"]
+      },
+      {
+        baseUrl: anthropicBaseUrl,
+        label: "Anthropic",
+        protocols: ["anthropic_messages"]
+      }
+    ]);
+    assert.equal(providerPresetMatchesBaseUrl(preset, `${openAiBaseUrl}/responses`), true);
+    assert.equal(providerPresetMatchesBaseUrl(preset, `${anthropicBaseUrl}/v1/messages`), true);
+  }
+});
+
 test("NVIDIA preset ignores stale Responses detection and converts Codex requests to Chat Completions", () => {
   const provider = {
     api_base_url: "https://integrate.api.nvidia.com/v1",
diff --git a/packages/ui/src/assets/provider-icons/xiaomi-mimo.png b/packages/ui/src/assets/provider-icons/xiaomi-mimo.png
new file mode 100644
index 00000000..a90545bf
Binary files /dev/null and b/packages/ui/src/assets/provider-icons/xiaomi-mimo.png differ
diff --git a/packages/ui/src/pages/home/shared/i18n.tsx b/packages/ui/src/pages/home/shared/i18n.tsx
index 1df41ebc..51bb6c4f 100644
--- a/packages/ui/src/pages/home/shared/i18n.tsx
+++ b/packages/ui/src/pages/home/shared/i18n.tsx
@@ -2128,6 +2128,10 @@ export const appCopy: Record<ResolvedLanguage, AppCopy> = {
       "Kimi API (China)": "Kimi API（国内）",
       "Kimi API (Global)": "Kimi API（海外）",
       "Kimi Code - Coding Plan": "Kimi Code - Coding Plan",
+      "Xiaomi MiMo": "小米 MiMo",
+      "Xiaomi Token Plan (China)": "MiMo 套餐（国内）",
+      "Xiaomi Token Plan (Europe)": "MiMo 套餐（欧洲）",
+      "Xiaomi Token Plan (Singapore)": "MiMo 套餐（新加坡）",
       "Zhipu AI (China)": "智谱 AI (国内)",
       "Zhipu AI (China) - Coding Plan": "智谱 AI (国内) - Coding Plan",
       "Zhipu AI (China) - General Endpoint": "智谱 AI (国内) - 通用端点",
diff --git a/packages/ui/src/pages/home/shared/options.ts b/packages/ui/src/pages/home/shared/options.ts
index 7fbebf6c..5a986ee3 100644
--- a/packages/ui/src/pages/home/shared/options.ts
+++ b/packages/ui/src/pages/home/shared/options.ts
@@ -62,6 +62,7 @@ import runapiProviderIconUrl from "@/assets/provider-icons/runapi.jpg";
 import siliconflowProviderIconUrl from "@/assets/provider-icons/siliconflow.png";
 import teamorouterProviderIconUrl from "@/assets/provider-icons/teamorouter.png";
 import unity2ProviderIconUrl from "@/assets/provider-icons/unity2.jpg";
+import xiaomiMimoProviderIconUrl from "@/assets/provider-icons/xiaomi-mimo.png";
 import zaiGlobalCodingProviderIconUrl from "@/assets/provider-icons/zai-global-coding.svg";
 import zaiGlobalGeneralProviderIconUrl from "@/assets/provider-icons/zai-global-general.svg";
 import zhipuCnCodingProviderIconUrl from "@/assets/provider-icons/zhipu-cn-coding.png";
@@ -389,6 +390,10 @@ export const providerPresetIconUrls: Record<string, string> = {
   siliconflow: siliconflowProviderIconUrl,
   teamorouter: teamorouterProviderIconUrl,
   unity2: unity2ProviderIconUrl,
+  xiaomi: xiaomiMimoProviderIconUrl,
+  "xiaomi-token-plan-ams": xiaomiMimoProviderIconUrl,
+  "xiaomi-token-plan-cn": xiaomiMimoProviderIconUrl,
+  "xiaomi-token-plan-sgp": xiaomiMimoProviderIconUrl,
   "zai-global-coding": zaiGlobalCodingProviderIconUrl,
   "zai-global-general": zaiGlobalGeneralProviderIconUrl,
   "zhipu-cn-coding": zhipuCnCodingProviderIconUrl,
diff --git a/packages/ui/test/integration/providers.test.ts b/packages/ui/test/integration/providers.test.ts
index 4d2dacd6..00c78e65 100644
--- a/packages/ui/test/integration/providers.test.ts
+++ b/packages/ui/test/integration/providers.test.ts
@@ -7,6 +7,7 @@ import { geminiProviderPreset } from "@ccr/core/providers/presets/gemini/index.t
 import { minimaxChinaProviderPreset } from "@ccr/core/providers/presets/minimax/index.ts";
 import { moonshotGlobalProviderPreset } from "@ccr/core/providers/presets/moonshot/index.ts";
 import { qiniuAiProviderPreset } from "@ccr/core/providers/presets/qiniu-ai/index.ts";
+import { xiaomiMimoProviderPreset } from "@ccr/core/providers/presets/xiaomi/index.ts";
 import { AddProviderDialog, AddProviderForm, ProviderConnectivityCheckDialog, ProvidersView, uniqueProviderProbeProtocolRows } from "@ccr/ui/pages/home/components/providers.tsx";
 import {
   applyProviderProbeResult,
@@ -1266,7 +1267,7 @@ test("provider deep link config saves anthropic probe prefix as capability URL",
 });
 
 test("provider display icon prefers custom icons and falls back to preset icons", () => {
-  setProviderPresets([geminiProviderPreset, minimaxChinaProviderPreset]);
+  setProviderPresets([geminiProviderPreset, minimaxChinaProviderPreset, xiaomiMimoProviderPreset]);
 
   assert.equal(
     providerDisplayIcon({
@@ -1296,6 +1297,18 @@ test("provider display icon prefers custom icons and falls back to preset icons"
     }),
     providerPresetIconUrls["minimax-cn"]
   );
+  assert.equal(
+    providerDisplayIcon({
+      api_base_url: "https://api.xiaomimimo.com/v1",
+      models: [],
+      name: "Xiaomi MiMo",
+      type: "openai_responses"
+    }),
+    providerPresetIconUrls.xiaomi
+  );
+  assert.equal(providerPresetIconUrls["xiaomi-token-plan-cn"], providerPresetIconUrls.xiaomi);
+  assert.equal(providerPresetIconUrls["xiaomi-token-plan-sgp"], providerPresetIconUrls.xiaomi);
+  assert.equal(providerPresetIconUrls["xiaomi-token-plan-ams"], providerPresetIconUrls.xiaomi);
   assert.equal(
     providerDisplayIcon({
       api_base_url: "https://cli-chat-proxy.grok.com/v1",