On Tuesday at Google I/O 2025, the company announced Deep Think, an “enhanced” reasoning mode for its flagship Gemini 2.5 Pro model. Deep Think allows the model to consider multiple answers to questions before responding, boosting its performance on certain benchmarks.

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.

During Google I/O 2025, the tech titan showcased how its latest upgrades of Gemini 2.5 Pro, Gemini 2.5 Flash, and especially Deep Think, are trying to reshape AI’s reasoning capabilities. What is Deep Think, and why does it matter? Unlike traditional AI outputs that respond instantly, Deep Think stimulates more cognitive reasoning.