Gemini 2.5 Deep Think ships to Google AI Ultra subscribers, capped below IMO gold
Google began rolling out Gemini 2.5 Deep Think in the Gemini app on 1 August, toggled on from the prompt bar and gated to Google AI Ultra subscribers. The model uses extended, parallel thinking — generating and evaluating several lines of reasoning at once — plus new reinforcement-learning techniques, and Google says it is a measured improvement over the version announced at I/O in May. It is a variation of the model that reached gold-medal standard at this year's International Mathematical Olympiad; the shipping version is faster and, on Google's internal 2025 IMO benchmark, reaches Bronze-level performance.
Google is simultaneously handing the full, slower IMO model to a select group of mathematicians and academics rather than to the paying tier, keeping the highest test-time-compute configuration out of the product. The gold-medal model took hours to reason through complex maths problems, which is precisely the trade the shipped version is solving for.

WHY IT MATTERS
Deep Think is the clearest public statement that reasoning quality now scales with test-time compute budget and sampling strategy, not just weights: the parallel-sample-then-verify loop Google describes is reproducible in your own agent with a self-consistency or verifier pass, at a cost and latency you control rather than a vendor tier you buy.
