# Apple trains 8B UI navigation agents with online reinforcement learning on live iOS apps

> Original title: Online Dense Reinforcement Learning with Planning-Grounding Agent for UI Navigation on Live iOS Apps

- Source: Apple Machine Learning Research
- Published: 2026-11-02T00:00:00.000Z
- Bad Influence: https://badinfluence.news/items/v52zne1qup7m7ni191jgkb5xf
- Original: https://machinelearning.apple.com/research/planning-grounding-ui-navigation

## Summary

Apple Machine Learning Research says its online reinforcement learning framework trains UI navigation agents directly on live iOS apps, using a Planning agent paired with a UI Grounding model. The 8B RL agents reach nearly a sevenfold improvement over the SFT baseline in out-of-distribution generalization to Android, and outperform Gemini-3.5-Flash while tying Gemini-3.1-Pro on real iOS applications.