Gemini 2.5 Deep Think

Gemini 2.5 Deep Think is Google DeepMind's multi-agent reasoning system, first introduced at Google I/O in May 2025 and rolled out to Google AI Ultra subscribers on August 1, 2025. Instead of following a single reasoning path, it spawns multiple AI agents that explore and evaluate hypotheses in parallel, then synthesizes the best solution.

A full research variant achieved gold-medal level performance at the 2025 International Mathematical Olympiad, while the consumer version available to $250-per-month Ultra subscribers reported strong results including 34.8 percent on Humanity's Last Exam and 87.6 percent on LiveCodeBench V6 (vendor-reported). It integrates code execution and Google Search tooling for complex coding, math, and scientific work.