In this mode, Gemini 3 Pro enables multiple parallel reasoning threads to simultaneously test different hypotheses.

Gemini 2.5 Deep Think, which won gold at the ICPC and IMO Mathematical Olympiads, ran on the same architecture (the recent DeepSeek V3.2-Speciale also won gold there, by the way).

For now, Deep Think is only available on the Ultra plan, which costs $250 per month.