The five leading AI chatbots have converged on price. ChatGPT Plus, Claude Pro, Google AI Pro, Perplexity Pro and Microsoft’s consumer plan all sit at roughly $20 a month. The models behind them are close enough that most people cannot reliably tell them apart on everyday questions.
What actually differs is how much you can use them before hitting a wall, what happens when you do, and how each one connects to the rest of your working life. This guide compares the five on documented usage limits, free versus paid boundaries, team options and ecosystem fit, using vendor pricing pages and support documentation. Where a vendor does not publish a figure, this guide says so, which turns out to be most of them.
What actually separates them in 2026
Usage limits, not capability, is the real differentiator. All five handle writing, summarising and analysis competently. Where they diverge is how quickly you exhaust the plan and whether the tool stops or keeps going at extra cost.
Only one of the five publishes hard numbers. Perplexity states specific weekly and monthly allowances. Anthropic, OpenAI, Google and Microsoft all describe limits without committing to figures, which makes forecasting genuinely difficult. If a comparison quotes you an exact message count for ChatGPT or Claude, it is reporting user observation rather than vendor documentation.
Web research is a real capability split. Perplexity is built around retrieval and citation. The others have added web access, but it is a feature rather than the architecture.
Ecosystem gravity often decides it. Gemini reaches into Google Workspace, Copilot into Microsoft 365. If your documents and email live in one of those, that pull may outweigh any model comparison.
ChatGPT
ChatGPT remains the broadest general-purpose assistant and has the widest plan ladder. OpenAI now runs a free tier, a lower-cost Go plan around $8, Plus at $20, higher Pro tiers, and Business and Enterprise seats for organisations.
One change deserves attention if you are choosing a free or entry plan for professional use: OpenAI introduced advertising on its lower consumer tiers during 2026. That is a meaningful difference from the other four, none of which advertise in the assistant.
OpenAI does not publish precise message caps per tier. Free users get the current standard model with tighter throughput; paid tiers raise limits and open access to reasoning and agent features.
Suits: people who want one assistant for varied work, and anyone who wants the largest ecosystem of third-party integrations. Our ChatGPT review covers the product in more depth.
Claude
Claude’s consumer ladder is Free, Pro at $20 a month or $17 billed annually, and two Max tiers at $100 and $200 offering roughly five and twenty times Pro’s usage. Team seats are sold at Standard and Premium levels, and Enterprise is custom priced. Max is currently monthly only, with no annual discount.
The mechanics of Claude’s limits are unusually worth understanding. Usage is a rolling budget measured over roughly five-hour sessions, with weekly caps layered on top, rather than a message count. Anthropic’s own pricing page says only that usage limits apply and that plans are subject to change; it does not publish an exact figure for any tier. Reported numbers circulating online come from user observation.
Two practical consequences. First, chat, Claude Code and other surfaces draw on the same allowance, so heavy use in one reduces headroom in another. Second, Anthropic added an extra-usage option on paid consumer plans: on reaching the included limit you can opt to continue at standard API rates under a spend cap you set, rather than stopping outright. That turns the Pro-versus-Max decision from a hard ceiling into a budgeting question.
Suits: long-document work, sustained reasoning tasks, and anyone who values a generous free tier that runs a current mid-tier model rather than a stripped-down one.
Google Gemini
Google sells a free Gemini tier, then a lower-cost AI Plus plan, Google AI Pro at $19.99 including substantial cloud storage, and Google AI Ultra from around $99.99 with up to twenty times Pro’s usage limits.
Google does not publish specific rate limits for consumer tiers, and available reporting indicates limits vary by query complexity rather than being a flat count. Bundling is the real proposition: paid Gemini tiers arrive with storage and other Google services attached, which changes the value calculation if you already pay for Google One.
Suits: anyone working inside Gmail, Docs and Drive, and households already paying Google for storage.
Perplexity
Perplexity is the answer engine of the group, built around searching the live web and citing sources rather than answering from model memory alone. For fact-checking, research and shopping questions, that architecture is the point.
It is also the only one of the five that publishes concrete allowances. Pro at $20 a month, or $17 annually, includes a stated weekly quota of Pro Search queries and a monthly allocation of Deep Research reports. Max at $200 is advertised as providing unlimited queries on the same features.
One caution worth knowing before you subscribe on the strength of an older review: Perplexity substantially reduced its Deep Research allowances during 2026 after moving to more compute-intensive models. Quality per report rose, the number of reports fell sharply. Its newer agentic features also run on a separate credit allocation rather than the search quota, with the larger allocation reserved for Max.
Suits: researchers, analysts and anyone who needs citations. It is frequently the best second subscription rather than the only one. See also our guide to AI research tools.
Microsoft Copilot
Copilot’s consumer packaging changed significantly and older comparisons are now wrong. Microsoft stopped selling the standalone Copilot Pro subscription and folded its features into Microsoft 365 Premium at $19.99 a month, which bundles the Office apps, storage and Copilot in one plan. Existing Copilot Pro subscribers were given a wind-down date in 2026. A free Copilot tier remains.
For organisations the structure is different again, and it is the detail most guides omit: Microsoft 365 Copilot is sold as a per-user add-on that requires a qualifying Microsoft 365 licence underneath it. You cannot buy it standalone. The enterprise add-on has held at $30 per user per month, with business bundles in the $18 to $30 range, so the true cost per seat is the add-on plus the base licence.
Microsoft also meters some capabilities with AI credits. Its support documentation distinguishes feature limits, meaning how often you can use a specific feature in a timeframe, from AI credits, which are a monthly allotment consumed across Copilot features in Microsoft 365 and Windows apps, and notes that limits may vary by feature and entry point and can change.
Suits: people who spend the working day inside Word, Excel, Outlook and Teams. Outside that context it is the least compelling of the five.
Plans and limits compared
Published figures at the time of writing. All five vendors state that prices and limits are subject to change.
| Assistant | Free tier | Entry paid | High tier | Limits published? | Team option |
|---|---|---|---|---|---|
| ChatGPT | Yes, ad-supported on lower tiers | Go ~$8, Plus $20 | Pro tiers | No exact figures | Business and Enterprise |
| Claude | Yes, current mid-tier model | Pro $20 ($17 annual) | Max $100 / $200 | No exact figures | Team and Enterprise |
| Gemini | Yes | AI Pro $19.99 | AI Ultra from ~$99.99 | No, varies by complexity | Via Workspace |
| Perplexity | Yes | Pro $20 ($17 annual) | Max $200 | Yes, weekly and monthly | Enterprise |
| Microsoft Copilot | Yes | M365 Premium $19.99 | Enterprise add-on ~$30/user | Partly, via AI credits | Add-on, needs base licence |
Free versus paid
The free tiers are more capable than they were, and for many people one of them is genuinely sufficient. What paid plans actually buy varies:
- Headroom, mostly. On Claude, Max tiers add usage rather than features. Google AI Ultra is largely the same proposition. You are buying the right not to be interrupted.
- Access to stronger models. On most platforms the free tier runs the fast everyday model and reserves the strongest for subscribers. Claude is the outlier in giving free users a current mid-tier model.
- An ad-free experience. Now a genuine differentiator on ChatGPT’s lower tiers.
- Agentic and research features. Deep research, agents and computer-use features generally sit behind paid tiers and often behind separate credit meters.
A reasonable approach: use the free tiers for a fortnight and note where you actually hit a wall. Whichever tool you run out of first is the one worth paying for.
Team and workspace options
Team plans generally add shared workspaces, administrative controls and, importantly, terms under which your data is not used for model training by default. That last point is usually the reason organisations move off individual subscriptions.
Structures differ. Anthropic and OpenAI sell seats directly. Google routes teams through Workspace. Microsoft requires an underlying Microsoft 365 licence beneath the Copilot add-on, which is the most expensive path if you are not already a Microsoft shop. Check whether the seat price you are quoted includes everything, because with Copilot it frequently does not.
Ecosystem lock-in
Worth thinking about before you commit annually. Gemini and Copilot are most valuable precisely where they are most entangled, inside Google Workspace and Microsoft 365 respectively. That value is real, and so is the switching cost once workflows depend on it.
ChatGPT, Claude and Perplexity are comparatively portable: your work is conversations and documents you can export, not automations wired into a suite. If you are unsure how long you will stay with a tool, that portability has a value of its own.
Which one suits you
General-purpose work and the widest integrations: ChatGPT.
Long documents, sustained reasoning, a strong free tier: Claude.
You already live in Google Workspace: Gemini, particularly if the bundled storage offsets a plan you already pay for.
Research with citations: Perplexity, and it is the only one publishing allowances you can plan against.
Your day is Word, Excel and Outlook: Copilot, budgeting for the base licence as well as the add-on.
For coding specifically, the picture differs enough that we cover it separately in our guide to AI coding tools for developers.
Related guides
- ChatGPT Review 2026
- Best AI Coding Tools in 2026
- Best AI Writing Tools in 2026
- Best AI Research Tools in 2026
- Best AI Tools for Students in 2026
- Best AI Productivity Tools in 2026
Frequently asked questions
How many messages do I actually get on a paid plan?
With most of these, the vendor does not say. Anthropic describes a rolling usage budget without publishing figures, OpenAI and Google do not publish exact caps, and Microsoft meters some features with AI credits. Perplexity is the exception, publishing weekly search and monthly research allowances.
What happens when I hit the limit?
Usually you wait for the window to reset. Anthropic added an option on paid consumer plans to continue at standard API rates under a spend cap you control, rather than stopping. Check whether your plan offers something similar before relying on it.
Is Copilot Pro still available?
Not for new subscribers. Microsoft folded its features into Microsoft 365 Premium at $19.99 a month and set a wind-down date for existing Copilot Pro subscriptions in 2026. Business Copilot remains an add-on requiring a qualifying Microsoft 365 licence.
Which has the best free tier?
It depends what you value. Claude gives free users a current mid-tier model with a large context window. Perplexity’s free tier is generous for occasional research. ChatGPT’s free tier is the most broadly capable but now carries advertising.
Can I use one subscription for a team?
No. Account sharing is prohibited under the terms of the major providers, and team plans exist partly to provide administrative controls and data handling terms that individual subscriptions do not.
Do these tools train on my conversations?
Policies differ by provider and by plan, and business tiers commonly exclude customer data from training by default. Check the specific plan you hold rather than assuming, as consumer and business terms are not the same.
Conclusion
At around $20 a month these five are close enough in capability that the sensible way to choose is by usage pattern and ecosystem, not by which model reviewed best. Claude and ChatGPT are the strongest general assistants, Perplexity is the research specialist and the only one publishing allowances you can plan against, and Gemini and Copilot are worth their price mainly if you already work inside Google Workspace or Microsoft 365.
The single most useful thing before subscribing is to establish what happens when you run out. On most of these platforms the answer is not published, which is itself worth knowing.
