Gemini Nano
Ships in Chrome (Prompt API in Origin Trial). Android. On-device summarization, translation, autofill enhancements.
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Apple Intelligence
~3B model on-device (iPhone 15 Pro+, M-series Mac). Larger cloud model (Private Cloud Compute) for hard queries. Hybrid.
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Chrome Prompt API
window.ai.assistant — JavaScript API. Web devs use on-device model directly. Zero server cost.