Google Rolls Out Gemini 3 Deep Think to AI Ultra — Advanced Reasoning Mode Now Live

What is Deep Think?

Gemini 3 Deep Think is a special mode of the flagship Gemini 3 model, designed to tackle complex reasoning tasks via parallel hypothesis evaluation and deeper context understanding. It builds on previous Deep Think variants and represents Google’s most ambitious reasoning upgrade yet. :contentReference[oaicite:15]{index=15}

Who Gets Access — and How to Try It

Starting December 4, 2025, Deep Think is rolling out to users subscribed to Google AI Ultra. To use it, open the Gemini app, select “Deep Think” in the prompt bar, and choose Gemini 3 Pro as the model. :contentReference[oaicite:16]{index=16}

Benchmarks & Performance Highlights

• Humanity’s Last Exam: 41.0% (without tools) — top result for interactive reasoning benchmarks. :contentReference[oaicite:17]{index=17}
• ARC-AGI-2: 45.1% (with code execution) — showing improved logical and reasoning skills on advanced tasks. :contentReference[oaicite:18]{index=18}
• GPQA-Diamond (scientific reasoning): ~93.8% — strong performance on scientific knowledge and understanding. :contentReference[oaicite:19]{index=19}

These results mark a step-change over previous models — making Deep Think among the most capable reasoning AIs currently available. :contentReference[oaicite:20]{index=20}

What Deep Think Enables — From Students to Developers

With Deep Think, users can ask for:

• Complex mathematical proofs, multi-step logic questions and scientific reasoning
• Code writing, debugging and logic-heavy algorithm design
• Scientific research assistance, data analysis and structured reasoning tasks
• Long-term planning, strategic ideation, and complex workflows requiring step-by-step reasoning

For developers and power-users, the upgrade further strengthens AI-assisted coding, research workflows, and reasoning-based tasks — making Gemini a strong contender in the advanced AI assistant space.

Limitations & Considerations

While Deep Think brings major improvements, it comes with trade-offs:

• Only available to paid AI Ultra subscribers; free-tier users don’t get access yet. :contentReference[oaicite:21]{index=21}
• Complex tasks may take longer due to deeper reasoning and higher compute needs.
• As with all AI models, results should be verified — especially in scientific, legal or safety-critical use cases.

Why This Matters in the AI Race

With Deep Think’s rollout, Google has raised the bar for what mainstream AI assistants can do. It’s more than chat or creative writing — this is about logic, reasoning and practical problem-solving at a high level. For educators, researchers, coders, and professionals, it’s a signal that AI is moving from novelty to utility.

For competing AI firms, Deep Think sets a new benchmark — one that may define the next generation of “thinking AI.”