When to Use Which Tool
Lesson 2.6 — When to Use Which Tool
Estimated reading time: 14 minutes
By now you know the main players: ChatGPT, Claude, Gemini, Grok, and Perplexity. You know roughly what each one does. But knowing the tools and knowing when to reach for which one are different things.
This lesson is a practical reference guide. The goal is that by the end of it, you have a mental map you can actually use — so when you sit down with a task, you're spending your time on the task, not wondering which tool to open.
The Core Principle: Different Tools Have Different Strengths
No single AI tool is the best at everything. The analogy that works best: think of them like different types of expert help.
- ChatGPT is like a capable, enthusiastic generalist — broad knowledge, good at creative tasks, great for coding, large and active community of users
- Claude is like a careful, thorough editor and analyst — excellent at reading long documents, producing nuanced writing, and following complex instructions precisely
- Gemini is like a well-connected researcher with a Google badge — strong on current information, deeply integrated with Google's products
- Grok is like a straight-talking colleague with a live news feed — direct answers, real-time X/Twitter access, and strong on current events and trending topics
- Perplexity is like a librarian who shows their work — every answer comes with sources you can check, making it ideal for research where accuracy matters
With that mental model, let's get specific.
Task-by-Task Guide
Writing: Drafts, Emails, Reports, Essays
Best choice: Claude
Good alternative: ChatGPT
Claude consistently produces higher-quality writing — it's more nuanced, less prone to the corporate-brochure tone that can plague AI writing, and better at maintaining a consistent voice across a longer document. For anything where the quality of the prose matters — a difficult email, a report that represents your organisation, a piece of writing you want to be genuinely good — Claude is the first place to go.
ChatGPT is also strong here and slightly more flexible on creative direction. If you find Claude's writing a bit reserved for your tastes, try ChatGPT.
Example task: Writing a client proposal
Prompt approach: "I'm writing a proposal for [client name], a [industry] company that wants help with [project]. Write a professional but warm opening section of about 300 words. Our company's tone is friendly and straightforward, not corporate."
Research: Finding Information and Synthesising It
Best choice: Perplexity AI (for verified, current research)
Good alternative: Gemini (if you're in Google's ecosystem)
Also good: ChatGPT or Claude (for synthesis and analysis of information you already have)
The key distinction here is whether you need current information with sources, or analysis of information you already have.
If you're researching a topic and need to know what's been written about it recently — news, reports, academic papers, industry developments — Perplexity is exceptional. Every answer shows you the sources. You can click through to the original pages. You're not just trusting the AI; you can verify.
If you already have the information (a report, a set of documents) and want to synthesise, summarise, or draw conclusions from it, Claude is excellent. Its large context window means you can feed it long documents, and it's careful and precise in its analysis.
Example task: Researching a competitor's recent activity
Perplexity prompt: "What has [company name] announced or launched in the last 6 months? Give me a summary with sources."
Coding: Writing, Explaining, or Debugging Code
Best choice: ChatGPT
Good alternative: Claude
ChatGPT has the largest community of developers using it for coding help, which means it's been extensively tested on a wide range of languages, frameworks, and problems. It's particularly good at writing code from scratch, explaining what code does, and debugging errors.
Claude is also excellent for code, and some developers prefer it for more complex tasks because of its ability to hold more context and reason carefully about implications. If you're working on a large codebase or need careful step-by-step reasoning about an architectural decision, try Claude.
For most everyday coding questions — "write me a Python script that does X," "explain what this function does," "why is this giving an error?" — either works very well.
Example task: Fixing a broken Excel formula
ChatGPT prompt: "This Excel formula isn't working: =VLOOKUP(A2,Sheet2!A:C,3,FALSE). I'm getting a #N/A error even though the value in A2 definitely exists in Sheet2. What's wrong and how do I fix it?"
Current Events and News
Best choice: Perplexity AI
Good alternative: Gemini (has strong web access)
Avoid: ChatGPT free tier, Claude free tier (limited or no web access)
ChatGPT and Claude both have knowledge cutoffs — their training data ends at a certain date, and they don't automatically know about things that happened after. Ask them about recent news and they'll either tell you they don't know, or worse, confidently generate something plausible but wrong.
Perplexity is built around answering questions from live web sources. It's essentially a research-grade search engine with AI on top. For anything time-sensitive, it's the right tool.
Gemini has good web integration too, though it can be slightly less reliable in showing its sources clearly.
Grok is also strong for current events — it pulls from the live web and X/Twitter, making it ideal when you want to know what people are actually saying about something right now, not just what has been published. If a story is breaking, Grok often has the most up-to-date picture.
Example task: Getting context on a news story
Perplexity prompt: "Give me a summary of recent developments in [topic], with sources. Focus on the last 3 months."
Long Document Analysis
Best choice: Claude
Good alternative: Gemini 1.5 Pro (with its enormous context window)
If you have a long document — a legal contract, an annual report, a research paper, a manuscript — and you need to analyse, summarise, or extract information from it, Claude is the best choice. Its context window (200,000 tokens) can handle very long documents, and its reading comprehension and analysis quality is excellent.
You can paste the entire document into the chat and ask specific questions: "What are the termination clauses in this contract?", "Summarise the key findings of this report," "What are the risks identified in this document?"
Gemini 1.5 Pro has an even larger context window (1 million tokens) if you're dealing with something truly enormous, but Claude tends to produce better quality analysis.
Example task: Reviewing a supplier contract
Claude prompt: "[Paste contract text] I need to review this contract before signing. Can you highlight: 1) Any clauses that are unusual or that I should be cautious about, 2) The payment and penalty terms, 3) The exit conditions?"
Brainstorming and Creative Ideation
Best choice: ChatGPT
Good alternative: Claude
When you need a lot of ideas quickly — names for a product, angles for a marketing campaign, topics for a blog series, solutions to a problem — ChatGPT tends to be more expansive and generative. It leans into quantity and variety. That energy is useful when you want to cast a wide net.
Claude is slightly more considered in brainstorming — you might get fewer ideas but each one is more developed. If you want quality over quantity, or you want the AI to think through the implications of ideas rather than just listing them, Claude is good here too.
Example task: Coming up with names for a new product
ChatGPT prompt: "I'm naming a new mobile app that helps people track their daily water intake and build better hydration habits. Target audience is health-conscious adults aged 25-45. Give me 20 potential app name ideas — some professional, some playful, some clever wordplay. Then highlight your three favourites and explain why."
Summarisation
Best choice: Claude or ChatGPT (both excellent)
Use: Whatever you already have open
For summarising articles, documents, meeting notes, or emails, both ChatGPT and Claude perform well. The difference is more noticeable with very long documents (Claude holds the edge) than with typical-length content.
For a quick summary of something you're reading in your browser, Perplexity actually has a browser extension that lets you summarise the current page with one click — worth knowing about.
Example task: Summarising a long article
Prompt: "Summarise this article in 5 bullet points, then give me one sentence on the main takeaway. [Paste article text]"
Personal Advice and Decision-Making
Best choice: Claude
Good alternative: ChatGPT
When you're working through a personal or professional decision — a career change, a difficult conversation, a strategic choice — Claude's careful, thorough approach tends to shine. It's good at asking the right clarifying questions, presenting multiple perspectives without being wishy-washy, and reasoning through implications methodically.
ChatGPT is also good here, and tends to be more willing to give a direct recommendation if you ask for one. Some people prefer that; others find it a bit overconfident.
Reminder for both: AI is not a therapist, a doctor, or a lawyer. For decisions with significant stakes, use AI to think through the problem, but consult the appropriate professional for the actual decision.
The Full Comparison Table
| Task | First Choice | Second Choice | Avoid |
|---|---|---|---|
| Writing & editing | Claude | ChatGPT | — |
| Long document analysis | Claude | Gemini Pro | — |
| Research with sources | Perplexity | Gemini | ChatGPT/Claude free |
| Current events/news | Perplexity or Grok | Gemini | ChatGPT/Claude (no web) |
| Coding | ChatGPT | Claude | — |
| Brainstorming ideas | ChatGPT | Claude | — |
| Google Workspace tasks | Gemini | — | — |
| Summarisation | Claude or ChatGPT | Either | — |
| Personal/professional decisions | Claude | ChatGPT | — |
| Precise arithmetic | Calculator | Excel | Any AI |
| Medical/legal specifics | Professional | — | Any AI alone |
Practical Workflow: How to Actually Use Multiple Tools
The ideal workflow isn't picking one tool and using it for everything. It's having two or three available and routing tasks intelligently.
Here's a simple setup that works for most people:
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Bookmark Perplexity, Claude, ChatGPT, and Grok (and Gemini if you use Google products). Each takes one click to open.
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Default to Claude for reading and writing tasks — it's the safest general-purpose choice for quality output.
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Switch to ChatGPT for coding, creative brainstorming, or if you hit Claude's daily limit.
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Open Perplexity whenever you need current information, want to check facts, or are researching a topic where you need to know where the information comes from.
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Use Gemini if you're working in Google Docs, Gmail, or Google Drive and want AI help directly in those tools.
You don't need all of them every day. But knowing which one to reach for when you have a specific task makes you faster and more effective.
Free vs. Paid: When Does It Matter?
For most beginners starting out, the free tiers are genuinely sufficient. Here's the honest assessment:
Stick with free if:
- You're using AI a few times a week, not daily
- Your tasks are typical length — emails, short documents, research questions
- You're still learning what AI can do and building habits
Consider paying if:
- You use AI every day for work
- You regularly hit daily or hourly limits on the free tier
- You need the most powerful model (Claude Opus, GPT-4o full) for complex tasks
- You want to use the memory / projects features that make regular use more efficient
At $20/month for either ChatGPT Plus or Claude Pro, the value is very high if you're a regular user. Many people find it pays for itself in saved time within the first week.
Key takeaway: Start free. Use the tools for a few weeks and see which ones you actually reach for. Then decide whether the paid tier of your favourite tool is worth it based on whether you're hitting limits and whether the value is there for your specific use.
Module 2 Wrap-Up
You've covered a lot of ground in this module. You know the main AI tools and who makes them. You have live accounts and know what you're getting on the free tier. You understand how conversations work, why memory resets between chats, what mistakes to avoid, and which tool to use for different tasks.
That's the foundation. The rest of this course builds on it — diving deeper into how to get great results for specific use cases in your work and life.
Before you move to Module 3, try using AI for one real task this week — something from your actual work or personal life. Use what you've learned here. Notice what works, what doesn't, and what you want to learn more about. That's the fastest path forward.
You've finished all the lessons in Module 2. Take the quiz to test your knowledge →