5 tools compared · AI
Best AI assistants for work in 2026
Almost every assistant here can draft an email competently, so feature lists are close to useless for choosing between them. What actually separates them is narrower: which handles a ninety-page document without losing the middle, which shows you where an answer came from, which is already paid for inside a suite you own, and which sells cosmetics rather than capability. This guide compares them on those grounds and on what you will actually be billed.
The short answer
- Claude - Best for long documents and careful work. Free; Pro from $17/month billed annually ($20 monthly).
- ChatGPT - Best ecosystem and most broadly useful. Free; Go from $8/month, Plus $20/month.
- Google Gemini - Best if you already run Google Workspace. Free; Google AI Plus from $4.99/month, AI Pro $19.99/month.
- Perplexity - Best for research you need to verify. Free; Pro from $17/month billed annually ($20 monthly).
- Grammarly - Best narrow tool, working everywhere. Free plan available; Pro $12/month.
Compared side by side
| # | Tool | Our pick for | Best for | Starting price | Free plan |
|---|---|---|---|---|---|
| 1 | Claude | Best for long documents and careful work | Long-context analysis, writing and code | Free; Pro from $17/month billed annually ($20 monthly) | Yes |
| 2 | ChatGPT | Best ecosystem and most broadly useful | Everyday drafting, analysis and general work | Free; Go from $8/month, Plus $20/month | Yes |
| 3 | Google Gemini | Best if you already run Google Workspace | Organisations inside Google Workspace | Free; Google AI Plus from $4.99/month, AI Pro $19.99/month | Yes |
| 4 | Perplexity | Best for research you need to verify | Cited answers and current information | Free; Pro from $17/month billed annually ($20 monthly) | Yes |
| 5 | Grammarly | Best narrow tool, working everywhere | Correction and tone inside existing apps | Free plan available; Pro $12/month | Yes |
How we chose
- Prices were read from each vendor's own pricing page on the verification date below.
- Where a vendor states usage limits as multiples rather than numbers, we say so instead of guessing.
- Capability judgements come from published documentation and our own use, not from vendor benchmarks.
- Assistants bundled into a suite are noted as such, because paying twice is the commonest waste here.
- No vendor saw their placement before publication.
What each option actually costs at 1 user/month, 5 users/month, 5 users/year users
Read from each vendor's own pricing page on 9 August 2026. Where a vendor's page would not reveal a price at a given volume, the cell says so rather than carrying an estimate.
The standard paid individual tier for each product, multiplied out. Gemini and Grammarly are also bundled into Google Workspace and Superhuman respectively, so a business may already hold them: check before buying seats. Claude's figure is its annual-billing rate.
| Platform | 1 user/month | 5 users/month | 5 users/year | Priced on |
|---|---|---|---|---|
| Google Gemini | $19.99 | $99.95 | $1,199.40 | Per user, AI Pro |
| ChatGPT | $20 | $100 | $1,200 | Per user, Plus |
| Claude | $17 | $85 | $1,020 | Per user, Pro billed annually |
| Perplexity | $17 | $85 | $1,020 | Per user, Pro billed annually |
| Grammarly | $12 | $60 | $720 | Per user, Pro |
- Cheapest at 1 user/month Grammarly at $12, though it does the narrowest job
- Cheapest at 5 users/month Grammarly at $60; of the general assistants, Claude and Perplexity at $85
- Cheapest at 5 users/year Grammarly at $720; Claude and Perplexity at $1,020 for a full assistant
How the ranking was scored
Each option is scored 0 to 10 on the dimensions below, weighted as shown, and the total is calculated from those numbers rather than asserted. Weights sum to 100.
| Option | Reasoning and instruction following 25% | Long context 20% | Breadth of fit 20% | Ecosystem 15% | Price transparency 10% | Cost 10% | Total |
|---|---|---|---|---|---|---|---|
| Claude | 10 | 10 | 8 | 7 | 9 | 8 | 8.9 |
| ChatGPT | 9 | 7 | 9 | 10 | 8 | 7 | 8.5 |
| Google Gemini | 8 | 9 | 8 | 8 | 3 | 7 | 7.6 |
| Perplexity | 7 | 6 | 4 | 5 | 9 | 8 | 6.2 |
| Grammarly | 5 | 3 | 5 | 8 | 9 | 9 | 5.9 |
Price transparency is scored because it is a real cost: Gemini describes its tiers as multiples of the free plan rather than absolute limits, so you cannot model whether a tier covers you before buying it. Perplexity scores low on breadth deliberately, since it is an answer engine rather than a general assistant and is the wrong purchase for drafting.
Choose by situation
| If you are… | Choose | Why |
|---|---|---|
| You work with long documents, contracts or large codebases | Claude | Holds very large inputs coherently, where smaller effective context quietly loses the middle. |
| You want the widest ecosystem and the most polished apps | ChatGPT | Largest plugin and integration surface, and the best mobile experience. |
| Your company runs Google Workspace | Gemini | Already in Gmail and Docs, and frequently already licensed. Check before buying seats. |
| You need answers you can verify against sources | Perplexity | Citations are the product. Only worth paying for if you will actually open them. |
| You want correction inside every app you already type in | Grammarly | Narrow job, done everywhere, for $12. Not a substitute for an assistant. |
| You are deploying to a whole company | ChatGPT Business or Claude Team | Individual consumer subscriptions leave you with no admin control and no data guarantees. |
| You need generated images | ChatGPT or Gemini | Claude has no image generation at any tier. |
Also considered, and why they are not here
| Product | Why it is not in the list |
|---|---|
| Microsoft Copilot | The equivalent bundled assistant for Microsoft 365. Not yet verified against a current pricing page. |
| DeepSeek, Mistral and other open-weight models | Credible and cheap, but we have not verified their hosted pricing or terms this round. |
| GitHub Copilot | A coding tool rather than a general assistant. Belongs in a developer-tools comparison. |
| Notion AI and similar in-product assistants | Features of another product, priced as add-ons. Covered on those products' profiles. |
| Meta AI | No published paid business tier to compare on. |
Claude Best for long documents and careful work
- Best for
- Long-context analysis, writing and code
- Starting price
- Free; Pro from $17/month billed annually ($20 monthly)
- Free plan
- Yes
Claude follows detailed instructions more reliably than the alternatives and stays coherent across very large inputs, which is the difference that shows up in real work rather than in demos. Paste a ninety-page contract and it will still answer accurately about page 12. Claude Code is included in Pro rather than sold separately, which for engineering teams is usually what justifies the spend.
Watch out: No image generation at any tier, and a smaller third-party plugin ecosystem than ChatGPT. The gap between Pro and Max is usage limits rather than capability, so model your real daily volume.
ChatGPT Best ecosystem and most broadly useful
- Best for
- Everyday drafting, analysis and general work
- Starting price
- Free; Go from $8/month, Plus $20/month
- Free plan
- Yes
The default for a reason: the widest ecosystem, the best mobile apps, and enough capability that Plus at $20 pays for itself quickly on drafting and editing alone. If you are buying one assistant for a mixed team and do not want to think about it, this is the safe answer.
Watch out: Deploy Business rather than individual Plus subscriptions across a company, or you get no admin console and no data guarantees. Pro at $100 is only justified if you genuinely hit Plus limits.
Google Gemini Best if you already run Google Workspace
- Best for
- Organisations inside Google Workspace
- Starting price
- Free; Google AI Plus from $4.99/month, AI Pro $19.99/month
- Free plan
- Yes
Gemini's advantage is location rather than capability. It is in Gmail and Docs with no integration work and frequently no extra licence, and for a large share of everyday tasks that convenience outweighs a modest capability gap. Long-context handling is genuinely strong.
Watch out: The least transparent pricing here. Tiers are described as 2x, 4x, 5x and 20x the free limits rather than absolute numbers, so you cannot tell whether a tier covers you until you try it. Check what your Workspace plan already includes before authorising per-person spend.
Perplexity Best for research you need to verify
- Best for
- Cited answers and current information
- Starting price
- Free; Pro from $17/month billed annually ($20 monthly)
- Free plan
- Yes
Perplexity answers with sources you can open, which changes what you can responsibly trust. For research, competitive checks and anything you will be asked to justify, that is worth more than fluency. It is also the clearest window into how AI answer engines cite pages.
Watch out: Not an assistant. It is weaker at drafting and editing than anything else here, and the citations are only valuable if you actually read them. Buy it alongside an assistant, not instead of one.
Grammarly Best narrow tool, working everywhere
- Best for
- Correction and tone inside existing apps
- Starting price
- Free plan available; Pro $12/month
- Free plan
- Yes
Better checking exists, but nothing else appears inside Gmail, Word, Slack and a CMS text box without changing how you work. That distribution is why it survived general-purpose assistants: those write better but require you to leave what you are doing.
Watch out: Suggestions flatten distinctive writing towards corporate neutral, and it has no editorial judgement about structure. Your text is processed on their servers, which some organisations cannot allow. Note the company now trades as Superhuman.
The four questions that actually decide this
How long are your inputs? If you routinely work with contracts, research sets or large codebases, long-context handling is the only feature that matters and Claude wins it. Models with smaller effective context lose the middle of long documents, and the failure is hard to spot because the answer still reads well.
Do you need to show your working? Perplexity answers with openable sources. For anything you will be asked to justify, that is a different category of usefulness from a confident paragraph.
What do you already pay for? Gemini is bundled into Google Workspace business tiers and Grammarly now sits inside Superhuman. Companies routinely buy consumer subscriptions for staff who already have access through work, which is the most common waste in this category.
Who is buying, you or your company? If it is your company, the answer is a business tier with an admin console, not a pile of personal subscriptions on expenses.
Gemini’s pricing deserves a specific warning
Google describes its tiers as roughly 2x, 4x, 5x and 20x the free plan’s limits rather than publishing absolute figures. That makes the ladder impossible to model: you cannot work out whether AI Pro covers your usage without buying it and finding out.
It is the least transparent pricing of any product in this guide, and the reason Gemini scores 3 out of 10 on price transparency in the rubric above despite being competitive on everything else.
Frequently asked questions
Which AI assistant is best overall in 2026?
For work involving long documents, careful instruction-following or code, Claude. For the widest ecosystem and general everyday use, ChatGPT. If your organisation runs Google Workspace, Gemini is often already paid for and good enough that the convenience wins. There is no single answer, which is why this guide scores them by job.
Is it worth paying for an AI assistant, or is the free tier enough?
Free tiers are genuinely usable for occasional questions. Paying buys higher usage limits and access to the stronger models, so the test is frequency: if you use it most working days, $17 to $20 a month is recovered quickly on drafting and editing. If you use it weekly, stay free.
Can I use a personal subscription for company work?
You can, and you probably should not. Consumer tiers give your administrators no visibility, no provisioning and weaker data commitments. ChatGPT Business and Claude Team exist for this, and both exclude workspace data from training by default.
Do any of these guarantee accurate answers?
No, and no tier changes that. All of them state incorrect things fluently. Perplexity's citations make checking faster rather than unnecessary. Anything that matters must be verified.
Which is cheapest?
Grammarly at $12 a month, but it does the narrowest job. Among full assistants, Claude and Perplexity at $17 on annual billing, then Gemini AI Plus at $4.99 for a limited tier. Gemini's cheapest route is often zero, because Workspace business plans include it.
Sources & verification
Facts on this page were read from the sources below on the dates shown. Where a vendor does not publish a figure, we record it as not disclosed rather than estimating it.
- ChatGPT pricing page - checked 9 August 2026
- Claude pricing page - checked 9 August 2026
- Google Gemini subscription plans - checked 9 August 2026
- Perplexity plans - checked 9 August 2026
- Grammarly plans - checked 9 August 2026
Spotted something out of date? Email [email protected] and we will re-check it. Corrections are logged on the page.