For a couple of years, using AI meant chatting. You typed a question, it typed an answer, and everything after that was down to you. That has changed. A new kind of tool has arrived that does not just talk about the work — it goes and does it: reads your files, fills in the spreadsheet, drafts the emails, builds the little tool you needed. People have started calling them "AI coworkers".
Three names come up most often: Claude Cowork from Anthropic, Codex from OpenAI, and Kimi from a company called Moonshot AI. This guide is for people who are not techies. No code, no jargon — just what each one is, what it costs, what it is good at, and how to put one to work without a computer science degree.
What an "AI coworker" actually is
Think of the difference between asking a friend "how do I write a good invoice reminder?" and handing that same friend your list of overdue clients and saying "chase these for me". The first is advice. The second is work getting done. An AI coworker is built for the second kind.
In practice that means it can do several steps in a row without you holding its hand at every stage. Give it a folder of messy receipts and it can sort them into a tidy spreadsheet. Give it a long, dull contract and it can pull out the bits that matter and flag the traps. Give it a rough idea and it can research it, draft it, and hand you something finished. You still check the work — you are the boss — but you are reviewing rather than doing every keystroke.
Meet the three
Claude Cowork is the most "assistant for everyday work" of the three. It sits alongside your files and folders, does multi-step office and life admin — documents, spreadsheets, research, tidying data, drafting messages — and can either run in the cloud or work directly on your own computer. It is aimed squarely at ordinary knowledge work, which makes it the friendliest starting point if you do not code.
OpenAI Codex is the odd one out. It is really a coding assistant — its speciality is writing and running actual software — and it lives inside ChatGPT rather than as a separate app. If you already pay for ChatGPT, you already have it. For a non-techie its everyday value is narrower: it shines when you want to build a small tool, a script or a simple website without hiring a developer, while ChatGPT itself handles the general chatting-and-drafting.
Kimi, from Moonshot AI, is the value pick. It is strong at reading very long documents (it can hold a huge amount in its head at once), it has its own agent and coding features, and it tends to be cheaper. The trade-off is that the app and company are less familiar to most people outside China, and the polish can feel a step behind the other two.
What they cost
Prices below are the headline consumer plans as of mid-2026. They change often, so treat these as a guide and check the official pages before you pay. The good news: all three have a free tier, so you can try before spending anything.
| Tool | Free tier? | Entry paid plan | Higher tiers |
|---|---|---|---|
| Claude Cowork | Yes | Pro, about $20/month (Cowork included) | Max from about $100/month for heavy use |
| OpenAI Codex | Yes | Comes inside ChatGPT — Go about $8, Plus about $20/month | Pro about $100–$200/month |
| Kimi | Yes | About $19/month | Up to about $199/month for power users |
For most people the story is simple: you can start free, and the entry paid plan for any of them lands around $20 a month — roughly the price of a couple of streaming services. Codex has no separate bill; it is bundled into a ChatGPT subscription. Kimi is the cheapest if you push it hard.
What they can actually do
Here is the honest, non-techie version of who is best at what.
| Job | Best fit | In plain terms |
|---|---|---|
| Everyday office & life admin | Claude Cowork | Documents, spreadsheets, tidying data, drafting emails, research — the daily grind. |
| Reading very long documents | Kimi | Holds huge files in memory, so it is strong on long contracts, reports and books. |
| Building a small tool or website | OpenAI Codex | Writes and runs real code, so you can make software without a developer. |
| Working with files on your own computer | Claude Cowork | Can act directly on your folders, not just files you paste in. |
| Cheapest heavy use | Kimi | Best value once you are using AI a lot every day. |
| Already using ChatGPT | OpenAI Codex | You already have it — no new app, no extra bill. |
None of them is "the best" outright. Claude Cowork is the safest first pick for non-techies who want office and life tasks handled. Kimi is the value option and a long-document specialist. Codex earns its place the moment you want to build something rather than just write.
If you keep the books
Bookkeeping and accounting are full of exactly the repetitive, structured work these tools are good at. A few things people are already handing over:
- Taming a messy export. Point it at a chaotic CSV of card transactions and ask it to categorise them, flag the odd ones, and total each category. What was an evening of squinting becomes a review.
- Chasing late payers. Give it your overdue list and ask for a firm-but-friendly reminder for each client, matched to how late they are. You read them, tweak the tone, send.
- Explaining the numbers. Ask it to turn a month of figures into three plain sentences a client will actually understand — or to explain a VAT rule or an HMRC letter in everyday language before you reply.
- A simple forecast. Describe your regular income and outgoings and ask it to build a basic cash-flow forecast in a spreadsheet, so you can see the tight months coming.
For the tools built specifically around money, our AI finance directory and the best AI tools for finance guide are a good next stop.
If you are starting a business
Starting out means doing ten jobs at once with no team. This is where an AI coworker earns its keep, because it can play several of those roles competently enough to get you moving.
- Pressure-test the idea. Before you spend a penny, have it argue against your idea — who already does this, why customers might not switch, where it could fall down. Better to hear it now than after launch.
- Write the boring-but-vital documents. A one-page plan, a simple financial forecast, a list of what you need to register a company (in the UK, the Companies House steps), and a first draft of your website copy.
- Name it and check the vibe. Generate options, sanity-check how they sound out loud, and flag any that clash with an existing brand or spell badly over the phone.
- Set up the admin. A basic invoicing spreadsheet, a simple system for tracking expenses, and templates for the emails you will send a hundred times.
- Make the first marketing. Turn one idea into a week of social posts, or draft the launch email to the people who already know you.
Our prompt library has ready-made prompts for most of these — idea validators, pitch writers, pricing workshops and more — so you are not starting from a blank page.
How to start this afternoon
You do not need to understand any of the technology. Here is the whole thing in five steps.
- Pick one and sign up for the free tier. If you are unsure, start with Claude Cowork for general work, or use Codex inside ChatGPT if you already pay for it.
- Choose a real, slightly annoying task. Not a test — something you actually need done. A messy spreadsheet, a pile of notes, a batch of emails.
- Describe the job like you would to a new assistant. Say what you want, give it the file or the details, and tell it what "good" looks like. If it asks questions, answer them — that is a good sign.
- Review, do not rubber-stamp. Read what it produces. Tell it what to fix. It will not sulk, and the second version is usually much better.
- Notice the time you saved. That feeling is the point. Do it again tomorrow with the next annoying task, and a habit forms.
Which one should you pick?
If you take nothing else away: pick Claude Cowork if you want an all-round assistant for everyday work and life admin and you are not a coder. Pick OpenAI Codex (inside ChatGPT) if you already use ChatGPT or you want to build a small tool or website without a developer. Pick Kimi if you care most about value, or you routinely work with very long documents.
Better still, since all three are free to try, spend twenty minutes with the one that fits your main job and see how it feels. The right tool is the one you actually keep using — and the only way to find that out is to hand it a real task and watch what comes back.
Prices and features mentioned were accurate as far as we could tell in mid-2026 and change frequently; check each provider's official pricing page before subscribing. Nothing here is financial, legal or tax advice.