How Gemini 2.5’s Deep Think could push Google AI to the next level

Can an AI model truly ‘think’? That’s the interesting question Google is exploring with Deep Think, a standout feature introduced in Gemini 2.5 Pro, the company’s most advanced model yet.

During Google I/O 2025, the tech titan showcased how its latest upgrades of Gemini 2.5 Pro, Gemini 2.5 Flash, and especially Deep Think, are trying to reshape AI’s reasoning capabilities.

What is Deep Think, and why does it matter? Unlike traditional AI outputs that respond instantly, Deep Think stimulates more cognitive reasoning.

It enables the Gemini 2.5 Pro model to pause and work through multi-step problems, like how a human might think through a complex math problem.

According to Google, Deep Think is already showing remarkable performance in benchmark evaluations like the USAMO (United States of America Mathematical Olympiad), a mathematics competition known for its complexity and rigour and LiveCodeBench, a convention to evaluate performance in programming tasks.

Furthermore, it achieved an impressive 84.0 per cent in MMMU (Massive Multi-disciplinary Multimodal Understanding), making Deep Think a top-quality performer in multimodal reasoning skills.

These results suggest a future where AI can move beyond recurring patterns to genuinely reason through abstract and layered problems.

Gemini 2.5 Pro, Deep Think’s home

Released on March 28, 2025, Gemini 2.5 Pro has already impressed, with its 1 million-token context window and multimodal input support (text, image, audio, video). At Google I/O 2025, Deep Think was introduced alongside native audio output, giving the model human-like speech capabilities and expanded multilingual support, further broadening its use.

This positions Gemini 2.5 Pro as a powerful assistant for developers, educators, and researchers, especially in domains requiring nuance, such as scientific analysis, coding, and education.

Gemini 2.5 Flash, the speed-focused counterpart

Gemini 2.5 Flash, launched on April 17, 2025, brings the same architectural DNA optimised for speed. Deep Think is currently exclusive to the Pro model and may make an appearance in Gemini 2.5 Flash down the line. Ideal for rapid tasks like chatbots and real-time search, Flash has also seen upgrades in reasoning, efficiency, and even native audio output.

For now, Deep Think remains in experimental testing, available on the Gemini API to trusted testers. But the implications are clear: AI is no longer just about fast answers—it’s about smart answers.

With Deep Think, Google is signalling a shift from reactive AI to reflective AI—one that does not just answer, but reasons, plans, and perhaps someday, understands.

Sci/Tech