Google launches Gemini 2.5 Deep Think for AI Ultra subscribers

Google has launched Gemini 2.5 Deep Think, its most advanced artificial intelligence model to date, making it available exclusively to subscribers of its $250-per-year AI Ultra plan. Unveiled at the I/O conference in May, Deep Think is now accessible within the Gemini app and web interface, though it is positioned as a specialized tool rather than a primary menu option.

Designed to tackle the most complex queries, Deep Think builds upon the foundation of Gemini 2.5 Pro by significantly increasing its “thinking time” through enhanced parallel analysis. Google explains that this allows the AI to explore multiple approaches to a problem, even re-evaluating and remixing various hypotheses to generate higher-quality outputs. Due to its intensive computational requirements, answers from Deep Think can take several minutes to generate.

This extended processing time reportedly enhances the AI’s capabilities across diverse fields, including design aesthetics, scientific reasoning, and complex coding tasks. Google’s internal benchmarks indicate that Deep Think surpasses not only the standard Gemini 2.5 Pro but also competing models like OpenAI o3 and Grok 4. A notable achievement is its performance on “Humanity’s Last Exam,” a challenging collection of 2,500 multi-modal questions spanning over 100 subjects. Deep Think scored 34.8 percent on this test, significantly outperforming other models which typically peak around 20 to 25 percent.

Mathematics is a particular focus for Deep Think, which has demonstrated strong performance in the AIME benchmark. Google recently highlighted a specially trained version of Deep Think, capable of processing for hours, that achieved an International Mathematical Olympiad (IMO) gold medal – a first for an AI. While this advanced IMO version is currently limited to trusted testers, the standard Deep Think model released today is still capable of reaching bronze medal status on the 2025 IMO test.

Despite the premium subscription cost, Google has implemented a daily query limit for Deep Think users, though the specific number has not been disclosed and is subject to change. Google plans to eventually make Deep Think available via an API, offering developers a paid service for more extensive access.