Alphabet's stock gained 1% Thursday, bucking the broader tech sector selloff that saw the Nasdaq fall 1.5%, following news of a major upgrade to its Gemini 3 Deep Think AI system. The Google parent company announced significant enhancements to its specialized reasoning mode designed to solve complex challenges in science, research, and engineering.

The upgraded Gemini 3 Deep Think AI system achieved impressive benchmarks, including a 48.4% score on 'Humanity's Last Exam' without tools, 84.6% on ARC-AGI-2, and gold-medal level performance on the International Math Olympiad 2025. The system also demonstrated proficiency in chemistry and physics, scoring at gold medal levels on the written sections of the 2025 International Physics and Chemistry Olympiads. Early testers have already found practical applications for the technology.

Mathematician Lisa Carbone from Rutgers University used Deep Think to review a technical mathematics paper, where it identified a subtle logical flaw that had previously gone unnoticed in human peer review. The company emphasized that Deep Think is built not just for theoretical applications but also for practical engineering uses, including the ability to transform sketches into 3D-printable models.