Learn AI · 5 min read

What is ChatGPT — and should you use it for work?

If you’ve heard colleagues mention ChatGPT but never quite understood what it is — or whether it’s safe to use for your job — this guide explains it in plain English. No jargon, no hype, and no affiliate links: CheyX earns nothing whatever you decide.

What ChatGPT actually is

ChatGPT is a chatbot made by OpenAI. You type a request in ordinary English — “write a polite email chasing this invoice”, “summarise this report in five bullet points”, “explain VAT thresholds simply” — and it replies in seconds with a usable draft.

Under the bonnet it’s a large language model: software trained on enormous amounts of text that has learned to predict what good writing looks like. It doesn’t “look up” answers like Google does. It generates them, which is why it’s brilliant at drafting and explaining, and unreliable at precise facts.

What it’s good at (for work)

ChatGPT is at its best when the task is producing or transforming words and you will review the result. Drafting: emails, proposals, job ads, social posts — a blank-page task that takes 30 minutes becomes a 5-minute editing task. Summarising: paste a long document and ask for the key points, risks, or action items. Rewriting: make this friendlier, shorter, more formal. Explaining: unfamiliar concepts and acronyms at whatever level you ask for. And brainstorming: names, angles, objections — it’s tireless and never embarrassed.

What it’s bad at

Facts and figures. ChatGPT can state wrong information with complete confidence — the industry calls these hallucinations. Never publish a statistic, legal claim, or price it gives you without checking.

Arithmetic. It’s a language model, not a calculator. Don’t trust it with financial calculations.

Anything confidential — unless you’ve checked the settings. On a free personal account, your conversations may be used to improve the model. If you’re pasting in customer data or company documents, use a paid or business tier with training turned off, and check your employer’s AI policy first.

Current events. Its built-in knowledge has a cutoff date. Newer versions can search the web, but verify anything time-sensitive.

Should you use it for work?

For most office jobs: yes, for drafting and summarising, with human review — the productivity gain is real and immediate. The pattern that works: AI writes the first draft, you make it true and make it yours. Three sensible rules: check your employer’s policy; never paste in personal data without confirming the tool’s data settings and your GDPR obligations; and remember that if your name is on the document, every fact in it is your responsibility, not the AI’s.

What does it cost in the UK?

There’s a genuinely useful free tier — start there. The paid tier, ChatGPT Plus, is about £20/month and gets you the stronger models, more usage, file uploads and image generation.

Here’s the part most people miss: if you only use AI occasionally, £20/month is probably an overpayment. Light usage — say 100 email-length tasks a month — costs pennies on pay-per-use API pricing, and there are strong free alternatives too.

The bottom line

ChatGPT is a drafting assistant, not an oracle. Used for words-with-review, it will likely save you hours a week. Used for facts-without-checking, it will eventually embarrass you. Start with the free tier, follow your company’s policy, and check what your usage actually costs before paying for a subscription.

Prices verified May–June 2026. CheyX has no affiliate relationship with OpenAI or any AI company.