Has AI Started ‘Deliberating’? A Complete Guide to Google Gemini’s ‘Deep Think’

Imagine this. You are sitting at your desk trying to solve a very difficult math problem. Instead of shouting “The answer is 42!” within one second of seeing the problem, you quietly pull out a notebook and start writing down equations. Midway through, you might cross something out, saying, “Oh, this method is wrong,” and try another way. After struggling and contemplating for a while, you finally find the correct answer.

Until now, most of the Artificial Intelligence (AI) we used was closer to the former. When asked a question, it reacted in 0.1 seconds as if it had a prepared answer ready. However, the new ‘Deep Think’ mode introduced by Google in the Gemini app has started to behave like the latter. AI has learned how to ‘deliberate’ on its own. Gemini 2.5 Deep Think Full Analysis: What it means for AI to learn ‘deliberation’

In this article, we kindly explain what this smart and cautious change that has quietly entered our lives is, and how it can change our daily routines.

Why is this important?

What does it mean for us that AI is doing more than just speaking well and is actually ‘thinking’?

Existing AI operated as an ‘intuitive answer machine’ that quickly found the word with the highest probability of coming next in a sentence. However, ‘Deep Think’ is an advanced reasoning feature designed to solve complex math, science, and coding (the act of creating programs in computer languages) problems. Gemini 2.5: Deep Think is now rolling out - The Keyword

Simply put, it has gained the ability to actually review each step of a solution process to derive an answer, rather than just guessing during an exam. This makes a huge difference, especially in professional fields that require logical thinking. Google DeepMind emphasizes that this feature was specifically designed to solve tangled logic problems that even previous state-of-the-art models found difficult. Gemini 3 Deep Think is now available - The Keyword

Understanding easily: AI’s ‘Thinking Slow’

To understand the core principles of Deep Think, let’s use two analogies.

1. The Cramming Student vs. The Cautious Scholar

If previous AIs were ‘cramming students’ who poured out everything in their heads as soon as they received a question, Deep Think is like a ‘cautious scholar’ who sits patiently at a desk to examine a problem from multiple angles. Technically, this is called Extended Inference Time. Summary: Try Deep Think in the Gemini app | StartupHub.ai

2. Parallel Thinking: Contemplating with multiple minds at once

Deep Think uses a technology called Parallel Thinking. Deep Think is available in the Google Gemini App. How to try it. - MSN

Imagine you have a giant 1,000-piece puzzle in front of you. If you solve it alone, it will take a long time and you’ll make many mistakes. But what if dozens of ‘yous’ simultaneously took charge of different areas and tried to fit the pieces? It’s a method where various ideas are reviewed simultaneously—”Should I put this piece here?”, “No, I think that side fits better”—and then the most perfect result is combined into one. Deep Think is available in the Google Gemini App. How to try it. - MSN

Thanks to this approach, Deep Think has gained the ability to solve very difficult problems at the level of the ‘International Mathematical Olympiad (IMO),’ often called the World Cup of mathematics. In fact, a specific version of the model achieved a gold-medal level performance at the IMO, standing shoulder to shoulder with geniuses from around the world, and proved its skill by easily solving high-difficulty bronze-level problems. Gemini 2.5: Deep Think is now rolling out - The Keyword, Google launches Deep Think AI tool for Gemini app users …

Current Status: Who can use it, and how?

Unfortunately, the Deep Think feature is not yet open to all users for free. Google is providing this powerful feature exclusively to Google AI Ultra subscribers. Google DeepMind: Try Deep Think in the Gemini app

• Cost and Value: The AI Ultra service is priced at a somewhat high subscription fee of $250 per month (approximately 330,000 KRW). While this is much more expensive than typical app subscriptions, its value can be unique if you consider it the cost of having an expert-level logical partner by your side. Deep Think is available in the Google Gemini App. How to try it. - MSN

• Where to use it?: It can be conveniently accessed not only through the Android smartphone app but also via PC web browsers. [Gemini 3 Deep Think: A Guide to AI Reasoning

  DataCamp](https://www.datacamp.com/tutorial/gemini-3-deep-think/)

• How to use it: Being a subscriber doesn’t mean every answer will come via Deep Think. You must manually turn on the ‘Deep Think’ mode next to the command window (prompt bar) in the Gemini app for the AI to begin its serious deliberation. Deep Think is now available on the Gemini app for Android

This feature first made its debut in August 2025, alongside Gemini version 2.5. Google rolls out powerful creative problem-solving AI model … After numerous pieces of feedback and research, it was upgraded to the ‘Gemini 3 Deep Think’ mode in December 2025, showing unprecedented problem-solving capabilities in the fields of logic and science with even sharper performance. Gemini 3 Deep Think is now available - The Keyword, Google rolling out Gemini 3 Deep Think to AI Ultra

What lies ahead?

The emergence of Gemini 3 Deep Think symbolizes that AI has evolved beyond a secretary that simply searches for information into a ‘reasoning partner’ that contemplates and solves high-level problems with us. Gemini 3 Deep Think is now available - The Keyword

Passing the era of AI that reflexively spat out answers as soon as it was asked, the era of ‘thinking AI’ that thinks once more and reflects on itself is beginning. What difficult questions would you like to ask this smart and cautious friend?

AI’s Perspective

“MindTickleBytes AI Reporter’s View” The emergence of this Deep Think mode shows that the AI paradigm is shifting from ‘creative generation’ to ‘logical reasoning.’ The trend of ‘Slow AI,’ which values the transparency and logic of the process as much as the accuracy of the result, will bring fundamental changes to the way humans and AI collaborate. We look forward to AI as a colleague who contemplates together, rather than just a simple tool.

References

1. Gemini 2.5: Deep Think is now rolling out - The Keyword
2. Deep Think is available now in the Google Gemini App
3. Deep Think is now available on the Gemini app for Android
4. Google DeepMind: Try Deep Think in the Gemini app

5. [Gemini 3 Deep Think: A Guide to AI Reasoning

   DataCamp](https://www.datacamp.com/tutorial/gemini-3-deep-think)

6. [Try Deep Think in the Gemini app

   AIC - aicommission.org](https://aicommission.org/2025/08/try-deep-think-in-the-gemini-app/)

7. Exploring Gemini 3 Deep Think - Google’s Parallel Reasoning AI
8. Gemini 2.5 Deep Think Full Analysis: What it means for AI to learn ‘deliberation’
9. Deep Think is available in the Google Gemini App. How to try it. - MSN
10. Gemini 3 Deep Think is now available - The Keyword
11. Google rolling out Gemini 3 Deep Think to AI Ultra

12. [Summary: Try Deep Think in the Gemini app

    StartupHub.ai](https://www.startuphub.ai/ai-news/artificial-intelligence/2025/summary-try-deep-think-in-the-gemini-app)

13. Google launches Deep Think AI tool for Gemini app users …
14. Deep Think is available in the Google Gemini App. How to try it. - Mashable ME
15. Google rolls out powerful creative problem-solving AI model …

FACT-CHECK SUMMARY

• Claims checked: 15
• Claims verified: 15
• Verdict: PASS