At a Samsung event in London last week, executives demoed the company’s new take on AI assistants. The headline news is that Gemini has effectively replaced Bixby as the default Galaxy phone AI, even kicking the latter out of the quick-launch home button.

The Galaxy S25 is a tale of two AIs: Gemini and Bixby. Yes, while Google's Gemini AI assistant sits at the forefront—it can finally be triggered through a long press of the power button—Samsung is bringing its original Bixby voice assistant out from the shadows.

The corners on the S25 Ultra are a bit more rounded, the edges are flatter, and the bezels seem to be slightly thinner. The S25 and S25+ models have the same screen size as the S24 models, at 6.2 and 6.