How to Use Think Mode for Hard Problems in Grok

Grok has a Think mode that makes the model reason step by step before answering, trading speed for accuracy. It is the right tool for math, logic puzzles, code debugging, and anything with multiple dependent steps. This guide shows when to turn it on and how to prompt so the extra thinking is actually used well.

What you need

• Access to Grok on X or grok.com
• A problem that has a verifiable correct answer
• Patience for a slower response

Step 1: Turn on Think mode

Below the prompt box, Grok shows a Think toggle alongside the regular send option. Enable it before sending a hard question. In Think mode Grok works through the problem internally and you will see it take noticeably longer.

Step 2: State the problem cleanly with constraints

Think mode rewards a precise problem statement. Spell out the goal, the inputs, and any constraints, and ask Grok to show its reasoning and state assumptions. Vague questions waste the extra compute on guessing what you meant.

A train leaves at 9:00 going 60 mph. A second leaves the same station at 9:40 going 80 mph, same direction.
At what time does the second catch the first? Show each step and state any assumptions.

Step 3: Ask it to verify its own answer

After Grok answers, ask it to check the result a different way, by plugging numbers back in or solving by another method. Self-verification catches arithmetic slips that even reasoning mode makes. If the two methods disagree, you know to dig in.

Result

You get a worked solution with visible steps and a second-method check, which is far more trustworthy than a fast one-line answer. For genuinely hard problems, Think mode is the difference between a guess and a solution.