Google yesterday published an experimental AI assistant application named “COSMO” on the Play Store for Android devices, only to quickly remove the listing.
This brief public appearance highlights Google’s ongoing efforts in developing advanced artificial intelligence for mobile platforms, potentially using COSMO as a testbed for future features.
COSMO was described as an “experimental AI assistant application for Android devices” and aimed to bring “the power of artificial intelligence directly onto your device.” Its purpose included tasks ranging from organizing a user’s day to answering complex questions.
Notably, the application, identified by the package name com.google.research.air.cosmo, integrated a Gemini Nano model for on-device processing. This local AI capability contributed to the app’s substantial 1.13 GB download size. Users could select from three “Fulfillment Models”: Hybrid, which uses a server-based model online and Gemini Nano offline; PI Only, relying exclusively on a server; or Nano Only, utilizing only the local on-device model.
Unlike conversational assistants such as Google Gemini, COSMO appeared to function as a proactive AI agent. It was designed to take action based on user activity rather than waiting for explicit prompts. The app featured various “Skills,” including a List Tracker, Document Writer, Calendar Event Suggester, Deep Research, and Quick Photo Lookup.
The temporary availability suggests COSMO was an accidental early release, likely ahead of an official announcement, possibly at Google I/O 2026. Its experimental nature indicates it serves as a testing ground for new AI experiences that may eventually be integrated into broader Google AI products. The app is no longer accessible on the Google Play Store for most users.
