What is Claude and how is it different from ChatGPT?

Claude is Anthropic's AI assistant. For professional work, the key practical differences are: Claude handles significantly longer documents without losing coherence (larger context window), tends to produce more natural-sounding writing with less corporate filler, and reliably follows specific format constraints like length, tone, and structure. For most everyday tasks the difference is smaller than the difference between a good prompt and a bad one.

What work tasks is Claude best for?

Claude is particularly strong for: summarizing long documents (contracts, reports, meeting transcripts), drafting professional communications (emails, updates, proposals), analyzing options and surfacing trade-offs, preparing for meetings (agenda, key questions, hard questions to expect), improving existing writing, and building reusable prompt templates for recurring tasks.

How do I get better results from Claude?

Four techniques consistently improve Claude outputs: (1) Give it a role — "act as a senior [role] with experience in [context]" shapes expertise level; (2) Use format constraints — "under 100 words, no bullet points, end with one recommendation" — Claude follows these precisely; (3) Use the context window — paste full documents rather than manually summarizing them first; (4) Iterate — follow up with "make it shorter," "what are the risks," or "give me 3 alternatives" rather than starting over.

Is Claude free to use?

Claude offers a free tier at claude.ai. On Rebus Labs, courses teach professionals how to use Claude effectively through real work scenarios — with AI evaluation of your prompts and specific feedback on what to improve. The first lesson of every Rebus Labs course is free with no credit card required.

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How to Use Claude at Work: A Practical Beginner's Guide

Claude is one of the most capable AI assistants available, but capable doesn't mean easy to get value from. Here's what it's actually good at, and how to get useful results from day one.

February 20, 20258 min readBy Rebus Labs

Claude is Anthropic's AI assistant, and it consistently ranks alongside ChatGPT as one of the most useful AI tools for knowledge work. But most people try it once, get a decent response, and then go back to old habits. They miss most of the value.

This guide covers what Claude is genuinely good at, how to get better outputs, and what not to use it for.

What Claude Is Good At

Long documents. Claude can read and reason about very long documents without losing the thread. Use it to summarize reports, extract key decisions from meeting transcripts, or analyze lengthy contracts.

Writing that sounds like you. Give Claude examples of your writing style and it will adapt.

Complex reasoning. Ask Claude to think through a multi-step problem and it will work through it methodically.

Nuanced tone. Claude is strong in professional contexts where writing needs to be warm but direct.

What It's Not Good At

Real-time information. Do not ask it for current market data, recent news, or up-to-date statistics.

Precision calculations. Do not trust it to do spreadsheet-level math without verification.

Replacing expert judgment. Use Claude to accelerate your work, not to bypass professional expertise.

Six Work Tasks Where Claude Delivers

1. Summarizing Long Documents

Paste a report, transcript, or research paper and ask for key decisions, open questions, and commitments.

2. Drafting Communications

Give it raw notes, the recipient, the tone, and the goal. Then edit the draft to match your voice.

3. Preparing for Meetings

Ask for a suggested agenda, key points to make, and hard questions you should be ready to answer.

4. Analyzing Options

Claude handles structured comparison well and can surface trade-offs you have not considered.

5. Improving Your Own Writing

Be specific. Ask it to edit for clarity only, reduce jargon, or adjust tone while keeping your structure.

6. Building Reusable Prompts

Once you find a prompt that works for a recurring task, save it. A personal prompt library compounds over time.

Building the Skill

The gap between people who get real value from Claude and those who do not is practice. The fastest way to build that skill is structured, hands-on work with real tasks.

That is the premise behind Rebus Labs: practical, role-specific exercises built around the actual work professionals do every day.

Related lessons on Rebus Labs

Introduction to ClaudeClaude Basics Claude SkillsClaude Basics CoworkClaude Basics

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