Google accidentally revealed AI assistant COSMO in the Play Store and quickly hid the app

Google briefly uploaded the COSMO application to the Google Play Market — an experimental AI assistant for Android, and then removed it from public access. Based on the page content and interface, it was not about a finished release, but about a test platform for future Gemini and Android assistant features.

What Was Found in COSMO

On May 1, 2026, the COSMO application appeared on Google Play as an "experimental artificial intelligence assistant for Android devices." Shortly after, it was hidden. According to 9to5Google, the publication was likely accidental.

This is indicated by the nature of the application itself: the card showed no signs of a mass launch, and the package com.google.research.

air.cosmo suggests the project is related to Google Research, although it was published through Google's main account in the store. The application size stands out separately — 1.

13 GB. This is a lot for a typical mobile assistant, but it makes sense if there is indeed a local Gemini Nano model inside. After installation, COSMO requested several system permissions and opened a fairly simple chat interface.

Such a minimalist appearance looks more like an internal prototype or test bench than a service ready to be promoted among regular Android users.

What Functions Were Found

The most interesting thing is the list of skills discovered in the application. COSMO is conceived not as another chatbot, but as a system assistant that understands context and suggests actions right in the course of the conversation. Some features look like a development of Gemini, while others look like a move towards full-fledged AI agents capable of performing tasks on behalf of the user on the device and in the browser.

• Working with checklists and reminders without manual input
• Creating documents and summaries from existing files
• Proposing calendar events during correspondence or discussing plans
• Automating tasks in the browser through an agent mode connected to Mariner
• Finding photos, quick web search, explaining terms and helping with context recall

In addition, a Fulfillment Model menu with three modes was found in the settings: Hybrid, PI Only and Nano Only. Simply put, Google is testing a scheme where the assistant can work locally, through a server model, or in a hybrid mode. What PI exactly means is not explained in the leak. Voice match and screen access were also mentioned — another sign that COSMO should not only respond to requests, but also monitor the context of smartphone usage.

Why the App Disappeared

Later, 9to5Google updated the note: COSMO was removed from the Play Market, and the publication did turn out to be premature. This aligns well with Google's calendar. The Google I/O 2026 conference starts on May 19, and the company may well be preparing new announcements around Gemini, Android, and agent scenarios there.

COSMO is too raw for a public debut: a simple interface, a wide set of permissions, and an incompletely explained model architecture clearly indicate an early stage of the project. There is also a more important reason why such software should not be released without preparation. If the assistant can read the screen, work with the browser, suggest actions based on correspondence, and gather context from different applications, users need to very clearly understand where the data is processed, which functions run locally, and which go to the cloud.

That's exactly why the Hybrid and Nano Only modes are not a detail here, but a central part of the product. For Google, this is no longer just a question of convenience, but a question of trust and privacy.

What This Means

Even if COSMO was an accidental publication, the leak shows the direction Google is moving in: from a chatbot to a system AI assistant embedded in Android and capable of acting based on context. The main bet seems to be on a hybrid model — some tasks are performed directly on the device, while heavier scenarios go to the cloud. If on May 19, 2026, at Google I/O, the company officially reveals COSMO or its ideas, this will be another step towards mass mobile AI agents.