On Tuesday at Google I/O, the company's annual developer conference, Google announced Deep Think, an "enhanced" reasoning mode for Gemini 2.5 Pro that shows "incredible" skill at complex math and coding. The company also announced improvements to Pro as well as Gemini 2.5 Flash, the second of its "most intelligent" models. Here's what's new.

Google has started testing a reasoning model called Deep Think for Gemini 2.5 Pro, the company has revealed at its I/O developer conference. According to DeepMind CEO Demis Hassabis, Gemini's Deep Think uses "the latest cutting-edge research" that gives the model the capability to consider multiple hypotheses before responding to queries.

Gemini 2.5 Flash plays the role of the default model in the Gemini chatbot now. It's supposed to be the fast, cost-efficient model for daily use. Google says it’s better than its predecessors, like Gemini 2.0 Flash, in terms of understanding images and text while still being much cheaper to run.