Google Launches Gemini 3 Deep Think Mode for Ultra Subscribers

Google has introduced Gemini 3 Deep Think mode within the Gemini app, offering advanced reasoning capabilities for complex problem-solving. “Gemini 3 Deep Think is now available in the Gemini app,” wrote Tulsee Doshi, senior director of product management, in an announcement on December 4.

The new mode is available to Google AI Ultra subscribers and is designed to handle complex math, science, and logic queries. Users can access the feature by selecting “Deep Think” in the prompt bar and choosing Gemini 3 Pro from the model menu.

According to Google, Gemini 3 Deep Think demonstrates strong performance on benchmarks such as Humanity’s Last Exam, where it scored 41% without tools, and ARC-AGI-2, where it reached 45.1% with code execution. 

The system uses parallel reasoning to test multiple hypotheses, building on earlier Deep Think variants that performed well in competitions like the International Mathematical Olympiad and the ICPC World Finals.

Google recently launched the broader Gemini 3 lineup, positioning it as a step toward more capable AI systems. The company said Gemini 3 Pro outperforms Gemini 2.5 Pro, OpenAI’s GPT-5.1, and Anthropic’s Claude Sonnet 4.5 across benchmarks, including LMArena, Humanity’s Last Exam, GPQA Diamond, and MathArena Apex.

With expanded multimodal inputs, extended context windows and new planning tools, Google said Gemini 3 can be applied to tasks such as analysing research papers, translating handwritten documents, generating visualisations, and evaluating sports performance. 

The company also said Search’s AI Mode now includes generative UI features and interactive simulations.