Xiaomi's HyperOS 4 arrives in China with MiMo-powered assistant and AI note tools

Xiaomi has started rolling out HyperOS 4, the next version of its mobile operating system, and for now the release is limited to China. According to a post on dev.to, the update is built on Android 17 and its headline additions are AI features aimed at routine tasks: a reworked voice assistant, automatic transcription and summarisation, and contextual interface elements that suggest actions based on what is on screen.

Super XiaoAi 2.0

The upgraded assistant, Super XiaoAi 2.0, runs on Xiaomi's MiMo family of language models and is designed to keep context across applications. Instead of returning generic web-search answers, the assistant is meant to carry out multi-step tasks that span several apps and to coordinate connected smart devices, reducing the manual app-switching that usually goes along with such requests. Xiaomi has also added a bottom bar so the assistant can be summoned quickly from anywhere in the interface.

AI in Notes and Voice Recorder

Two existing apps get the most obviously practical upgrades. According to the dev.to post, the Voice Recorder no longer stops at transcription: it can break a recording into a structured summary that highlights key points and suggested follow-up actions, a feature clearly aimed at long meetings and lectures. The Notes app handles the written counterpart, converting loosely structured, free-form notes into organised to-do lists or cleaner drafts on demand.

Inspiration Ball and HyperIsland

Two interface-level additions round out the release. Inspiration Ball provides contextual triggers on screen — if the system detects an address or another useful piece of text, it immediately suggests a relevant action. HyperIsland, an existing Xiaomi interface element, has been tightened into an interactive hub for tracking ongoing tasks, again with the stated goal of cutting down the number of separate apps a user has to open.

China first, no global date yet

As is common with Xiaomi releases, there is a regional catch: the rollout covers China only. The dev.to report says Xiaomi has not given any timeline for international markets, and that regional sites are still sitting on HyperOS 3. Xiaomi owners can check where they stand by opening Settings, tapping About phone and reading the region code in the software version string — MI for Global, EU for Europe and CN for China.

One caveat worth flagging: the details come from a single community post rather than an official specification, so feature names and behaviour may be refined as the rollout widens. The broad shape of the release, however, is consistent with what Xiaomi has been building toward across recent HyperOS versions.

Why it matters

Xiaomi is one of the largest Android device makers, so the features it prioritises tend to set expectations for mainstream Android software well beyond its own user base. The emphasis here is telling: rather than another chatbot interface, the release focuses on cross-app task coordination, meeting summarisation and contextual suggestions — the kinds of utility features users are most likely to actually invoke day to day.

The decision to power the assistant with Xiaomi's own MiMo models also fits a wider pattern of hardware vendors building or customising their own AI capabilities instead of relying solely on Google's. And the China-first launch is a reminder of how fragmented Android updates remain: international Xiaomi users could wait months for features that Chinese users already have, with no confirmed date to plan around. For now, the practical read is that the features exist and look genuinely useful, but outside China the wait is open-ended.