DeepSeek

What is DeepSeek?

DeepSeek is a free AI assistant built by a company in China. You chat with it like any other AI helper, but it really shines at problems that need careful thinking: maths, logic, puzzles and coding. Its special "DeepThink" mode lets you watch how it reasons, step by step, before it answers.

Think of it as a patient tutor who shows all the working, not just the final answer.

What makes DeepSeek special

• Shows its thinking: turn on DeepThink to see the reasoning behind every answer
• Strong at maths and logic: solves problems step by step
• Completely free: no paid plan needed for the chat app
• Searches the web: turn on Search for current information
• Reads files: upload PDFs, images and documents to ask questions

What you can do with it

• Solve maths problems: from basic sums to algebra and statistics, with full working
• Crack puzzles: riddles, reasoning questions and aptitude problems
• Learn the "why": understand how an answer was reached, not just what it is
• Prepare for exams: practise aptitude, reasoning and quantitative questions
• Write and summarise: emails, notes and summaries of uploaded files
• Try coding: write, fix and explain simple code

Get started in 3 steps

1. Go to chat.deepseek.com and sign up with your email or Google account
2. Type your question, and tap DeepThink if it needs careful reasoning
3. Read the thinking process, then ask follow-ups if any step is unclear

On your phone: Download the DeepSeek app (Android or iPhone).

Prompts to try today

Maths: "Solve this step by step and explain each step simply: A train travels 240 km in 3 hours. How long will it take to cover 400 km?"

Reasoning: "Give me 5 logical reasoning questions for a competitive exam with solutions."

Understand: "Why does compound interest grow faster than simple interest? Show with an example."

Puzzle: "Give me a tricky riddle and wait for my answer before revealing it."

Files: "Read this PDF and list the 5 most important points." (attach file)

Coding: "Write a simple Python program that calculates the average of 5 numbers and explain it."

The secret to great answers

For tricky questions, switch on DeepThink and ask it to "explain step by step."
Example: "Using DeepThink, check my solution to this problem and tell me where I went wrong: [paste working]"

Good to know

• Mind your privacy: data is stored on servers in China, so never share personal, school or sensitive information
• Check important facts: AI can still make mistakes, especially on recent events
• Thinking takes time: DeepThink answers are slower but more careful
• Busy at times: the service can sometimes be slow when many people are using it

Quick challenge

Turn on DeepThink and give it a maths problem you once found difficult. Watch how it works it out!