diff --git a/Build/build-openai-voice.ts b/Build/build-openai-voice.ts
new file mode 100644
index 00000000..4e0fe9c5
--- /dev/null
+++ b/Build/build-openai-voice.ts
@@ -0,0 +1,93 @@
+import { fastIpVersion } from 'foxts/fast-ip-version';
+import { SHARED_DESCRIPTION } from './constants/description';
+import { $$fetch } from './lib/fetch-retry';
+import { RulesetOutput } from './lib/rules/ruleset';
+import { task } from './trace';
+
+const OPENAI_VOICE_IP_URL = 'https://openai.com/chatgpt-voice.json';
+
+function readPrefix(
+  entry: Record<string, unknown>,
+  field: 'ipv4Prefix' | 'ipv6Prefix',
+  version: 4 | 6,
+  index: number
+) {
+  const value = entry[field];
+  if (value === undefined) return null;
+
+  if (typeof value !== 'string' || fastIpVersion(value) !== version) {
+    throw new TypeError(`Invalid ${field} at prefixes[${index}]`);
+  }
+
+  return value;
+}
+
+function parseOpenAIVoiceJSON(data: unknown) {
+  if (
+    data === null
+    || typeof data !== 'object'
+    || !('prefixes' in data)
+    || !Array.isArray(data.prefixes)
+  ) {
+    throw new TypeError('Invalid OpenAI Voice IP list: missing prefixes array');
+  }
+
+  if (!('creationTime' in data) || typeof data.creationTime !== 'string') {
+    throw new TypeError('Invalid OpenAI Voice IP list: missing creationTime');
+  }
+
+  const lastUpdated = new Date(data.creationTime);
+  if (Number.isNaN(lastUpdated.getTime())) {
+    throw new TypeError('Invalid OpenAI Voice IP list: invalid creationTime');
+  }
+
+  const cidr4 = new Set<string>();
+  const cidr6 = new Set<string>();
+
+  for (let i = 0, len = data.prefixes.length; i < len; i++) {
+    const entry = data.prefixes[i];
+    if (entry === null || typeof entry !== 'object') {
+      throw new TypeError(`Invalid OpenAI Voice IP list entry at prefixes[${i}]`);
+    }
+
+    const ipv4 = readPrefix(entry as Record<string, unknown>, 'ipv4Prefix', 4, i);
+    const ipv6 = readPrefix(entry as Record<string, unknown>, 'ipv6Prefix', 6, i);
+
+    if (ipv4 === null && ipv6 === null) {
+      throw new TypeError(`OpenAI Voice IP list entry prefixes[${i}] has no IP prefix`);
+    }
+
+    if (ipv4 !== null) cidr4.add(ipv4);
+    if (ipv6 !== null) cidr6.add(ipv6);
+  }
+
+  if (cidr4.size + cidr6.size === 0) {
+    throw new TypeError('OpenAI Voice IP list is empty');
+  }
+
+  return {
+    cidr4: Array.from(cidr4),
+    cidr6: Array.from(cidr6),
+    lastUpdated
+  };
+}
+
+export const buildOpenAIVoice = task(require.main === module, __filename)(async (span) => {
+  const { cidr4, cidr6, lastUpdated } = await span.traceChildAsync('get OpenAI Voice IP ranges', async () => {
+    const response = await $$fetch(OPENAI_VOICE_IP_URL);
+    return parseOpenAIVoiceJSON(await response.json());
+  });
+
+  return new RulesetOutput(span, 'ai', 'ip')
+    .withTitle('Sukka\'s Ruleset - ChatGPT Voice IP CIDR')
+    .appendDescription(
+      SHARED_DESCRIPTION,
+      '',
+      'This file contains IP ranges used by ChatGPT Voice.'
+    )
+    .withDate(lastUpdated)
+    .appendDataSource(`${OPENAI_VOICE_IP_URL} (last updated: ${lastUpdated.toISOString()})`)
+    .bulkAddCIDR4NoResolve(cidr4)
+    .bulkAddCIDR6NoResolve(cidr6)
+    .write();
+});
diff --git a/Build/index.ts b/Build/index.ts
index e75f13f1..2c2e687a 100644
--- a/Build/index.ts
+++ b/Build/index.ts
@@ -6,6 +6,7 @@ import { downloadPreviousBuild } from './download-previous-build';
 import { buildCommon } from './build-common';
 import { buildRejectIPList } from './build-reject-ip-list';
 import { buildAppleCdn } from './build-apple-cdn';
+import { buildOpenAIVoice } from './build-openai-voice';
 import { buildRejectDomainSet } from './build-reject-domainset';
 import { buildChnCidr } from './build-chn-cidr';
 import { buildSpeedtestDomainSet } from './build-speedtest-domainset';
@@ -103,6 +104,7 @@ const buildFinishedLock = path.join(ROOT_DIR, '.BUILD_FINISHED');
       downloadPreviousBuildPromise.then(() => buildCommon()),
       downloadPreviousBuildPromise.then(() => buildRejectIPList()),
       downloadPreviousBuildPromise.then(() => buildAppleCdn()),
+      downloadPreviousBuildPromise.then(() => buildOpenAIVoice()),
       downloadPreviousBuildPromise.then(() => cdnDownloadWorker.buildCdnDownloadConf()),
       downloadPreviousBuildPromise.then(() => buildRejectDomainSet()),
       downloadPreviousBuildPromise.then(() => telegramCidrWorker.buildTelegramCIDR()),