COSMO and Gemini Nano:
On-Device AI Explained
Why Google's compact on-device AI model matters — and how it reportedly powers COSMO's privacy-first, low-latency assistant experience.
What Is Gemini Nano?
Gemini Nano is the smallest model in Google's Gemini family of large language models. Unlike Gemini Pro and Ultra, which run on cloud servers, Gemini Nano runs entirely on-device — directly on the user's smartphone processor without requiring an internet connection for basic inference.
First introduced at Google I/O 2024, Gemini Nano has been deployed in Smart Reply, Recorder summarization, and Magic Compose. COSMO represents the most ambitious use of Gemini Nano to date — embedding a full on-device AI model within a proactive assistant.
How Gemini Nano Powers COSMO
COSMO's approximately 1.13 GB app size is largely attributed to the bundled Gemini Nano model, suggesting COSMO ships with its own local AI model rather than relying solely on cloud processing.
Privacy-First
Sensitive data — screen content, conversations, personal context — can be processed locally without leaving the device.
Low Latency
On-device processing eliminates network round-trip time, enabling near-instant responses essential for a proactive assistant.
Offline Capability
Core COSMO functions could work without internet. While Deep Research and Browser Agent need network, basic context awareness could work offline.
Battery Efficient
Modern smartphone NPUs are designed for efficient AI inference, potentially using less energy than constant cloud communication.
Device Requirements
Gemini Nano currently requires hardware with a compatible Neural Processing Unit (NPU). Supported devices include:
- Google Pixel 8, Pixel 8 Pro, Pixel 9 series
- Samsung Galaxy S24 series and newer
- Flagships with Qualcomm Snapdragon 8 Gen 3 or equivalent
- Android 14+ with AI Core support
On-Device vs. Cloud: Hybrid Architecture
| Capability | Processing | Rationale |
|---|---|---|
| Screen reading & context | On-device | Privacy — sensitive content stays local |
| Quick suggestions | On-device | Speed — instant without network latency |
| Deep Research | Cloud | Requires web access and larger models |
| Browser Agent | Cloud + Device | Web navigation in cloud, local context on-device |
| Document Writer | Hybrid | Simple drafts locally, complex via cloud |
COSMO’s Fulfillment Model Setting
The app’s Fulfillment Model selector lets users choose between Hybrid (cloud + on-device), PI Only (cloud), and Nano Only (fully on-device) processing modes.
Why This Matters
Gemini Nano is a key differentiator for COSMO. By processing sensitive data on-device, COSMO can offer deeply personal, context-aware assistance while maintaining stronger privacy guarantees. It also explains why COSMO is Android-first — Apple does not expose equivalent on-device AI infrastructure for third-party apps.
📚 Sources
- 9to5Google — Play Store listing analysis revealing Gemini Nano bundling
- Android Authority — Gemini Nano capabilities and device compatibility
- Google AI Blog — Gemini Nano architecture and on-device AI