An unannounced Google app called COSMO appeared on the Google Play Store on May 1 and was removed within hours, in what appears to have been an accidental release of an experimental AI assistant. The listing, captured by several Android-focused publications before it disappeared, described an assistant built on Gemini Nano, Google’s small model designed to run on the device rather than in the cloud.
Google has not commented on the app. The timing, less than three weeks before the Google I/O developer conference on May 19 and 20, has led to speculation that COSMO or the technology behind it will be shown there.
What the listing showed
According to the reports, the app was about 1.13GB in size, a large download that is consistent with bundling an on-device language model. Its description and screenshots pointed to tools including a document writer, a feature that suggests calendar events, and a deep research function.
The listing also indicated three operating modes that mix local and server-based processing. That hybrid approach lets simple or sensitive tasks run entirely on the phone while more demanding requests are sent to Google’s servers, balancing privacy and speed against capability.
Some coverage described COSMO as proactive, meaning it is designed to surface suggestions and take actions without an explicit prompt, in line with the agent-style features Google has been building into Gemini.
Why on-device AI matters
Running AI models directly on a phone has practical advantages. Responses arrive faster because there is no round trip to a data center, the features work without a connection, and personal data such as messages and documents can be processed without leaving the device. The trade-off is capability: small models that fit on a phone are far less powerful than the frontier models that run in the cloud.
Google, Apple and Samsung are all pursuing this hybrid model. Apple’s Apple Intelligence splits work between on-device models and its Private Cloud Compute servers, and Samsung’s Galaxy AI features use a mix of local and cloud processing. Gemini Nano already powers several features on Pixel phones, including summarization and smart replies.
What comes next
An app that is published and withdrawn in a matter of hours is usually a sign of an internal test that was exposed by mistake, not a canceled project. Whether COSMO ships under that name, is folded into the main Gemini app, or remains an experiment should become clearer at I/O, where Google typically previews its Android and AI roadmap for the year.
