To choose an AI assistant, match three things: your existing ecosystem such as Microsoft 365, the specific task such as long documents or real-time trends, and the one constraint you cannot compromise on such as cost or context length. ChatGPT and Claude cost about $20 a month; Grok's free tier now includes real-time X search.
Summary: Five AI assistants dominate the market in 2026, and most people default to whichever one is already open instead of matching the tool to the job. This guide breaks down real pricing and context windows for ChatGPT, Claude, Copilot, Grok and Poe, then gives a three-question framework for choosing.
On April 9, 2026, OpenAI split its ChatGPT Pro plan into two separate tiers, and most comparison articles online still describe it as one product. That kind of drift is the actual problem with picking an AI assistant: the market moves every few months, and the advice does not.
Five assistants now cover almost every use case a working adult has for AI text chat: ChatGPT, Claude, Microsoft Copilot, Grok and Poe. None of them is the best one. Each has quietly specialized since this guide first ran in March 2026, and the axis that separates them is not raw model quality anymore.
It is which ecosystem you already work in, what task you are actually doing, and the one constraint you cannot compromise on. For a five-person team paying for two or three of these out of habit rather than reason, that is real monthly spend riding on a decision nobody has actually made.
Answer these before looking at a single feature list. This is the part that stays useful even after every price on this page changes again.
What ecosystem do you already live in? Microsoft 365 every working day, a terminal and GitHub, or just a browser tab? Your existing toolchain is the strongest signal for whether an assistant will feel native or bolted on.
What are you actually trying to do? Long documents and code review need a different tool than fast brainstorming, and both need a different tool than tracking a live news story. Match the task type first, not the brand name.
What is the one thing you cannot give up? Cost, context length, real-time data, or how well a tool fits inside software you already pay for. Naming that constraint out loud eliminates half the list before you compare a single feature.
Most people skip this step and pick whichever tab was already open. That is how a five-person marketing team ends up paying for four overlapping chat subscriptions nobody audits.
ChatGPT, built by OpenAI, covers more ground than any other assistant here: drafting, brainstorming, coding, image generation, voice, and a plugin ecosystem with hundreds of connected apps. Free access exists, but the tier structure above it changed twice in four months.
ChatGPT Go launched worldwide on January 15, 2026, at $8 a month, after debuting in India the previous August, according to reporting from Neowin. Plus remains $20 a month. Then on April 9, 2026, OpenAI split the old $200 Pro plan in two: a new $100 tier with five times the Codex usage of Plus, and the existing $200 tier at twenty times Plus usage, MacRumors reported at launch.
Both Pro tiers share the same model access. The difference is volume, not capability, which makes the $100 plan the one worth checking first if the $200 price previously scared you off. ChatGPT's weakness stays the same as it was in March: feed it a genuinely long document and the seams show faster than on a tool built for exactly that.
Claude, from Anthropic, runs a 200,000-token context window on every consumer tier, Free through Max, according to Claude's own pricing page. That is not the largest window on the market, but it is consistent: nothing is quietly downgraded when a bill lapses.
The Pro tier runs $17 a month if paid yearly, or $20 on the month-to-month plan. Max plans start at $100 a month for five times the usage of Pro, with a heavier 20x tier at the same starting price. Claude's Projects feature keeps files and instructions persistent across a session, which matters more the longer a piece of work runs. A client deliverable spread over two weeks behaves differently in Claude than in a tool that forgets everything between logins.
That persistence is the real sell, not the raw token count. A 200,000-token window is generous, but plenty of competitors quote a bigger number. What Anthropic is selling with Projects is continuity: the same files, the same instructions, the same context, still there on day twelve of a task that started on day one.
Of the five tools here, Microsoft Copilot is the one built to disappear into software you already have open, rather than sit in its own tab. The standalone chat at copilot.microsoft.com is free. The version that actually matters for a buying decision, Microsoft 365 Copilot, is priced as an add-on starting at $18 a user per month billed yearly, or bundled into Business Premium at $32 a user per month, according to Microsoft's own pricing page.
That is roughly Claude Pro money, but it buys something different: a chat panel inside Word, Excel, Outlook and Teams, with no tab switch required to summarize an email thread or build a chart from a spreadsheet.
For a team not already paying for Microsoft 365, there is little reason to start here. Every other tool on this list does general chat as well or better for less money. Copilot's entire pitch rests on a suite subscription most buyers hold already, purchased long before anyone weighed it as an AI decision.
Grok is built by xAI, which merged with SpaceX on February 2, 2026 and completed a corporate rebrand to SpaceXAI on July 6, 2026. Grok's product name, apps and pricing did not change with the rebrand.
What did change is the free tier. It now includes basic real-time web and X search on the smaller Grok 4 Mini model, a capability that used to require a paid plan. Image and video generation was pulled out of the free tier back in March 2026, so that part still costs.
SuperGrok runs $30 a month and adds the full Grok model line, DeepSearch and image and video generation through Grok Imagine. Grok is still weaker on long, structured reasoning than ChatGPT or Claude. Treat it as a scanner for what is happening right now, not a tool for deciding what to do about it.
Poe, run by Quora, does not have its own frontier model. It is an interface that gives one login to GPT-5.5, Claude-Opus-4.7, Gemini-3.5-Flash and hundreds of smaller bots, according to Poe's own subscription page.
Pricing runs on prepaid points rather than a flat fee. Billed annually, the entry Basic plan works out to roughly $4.17 a month, and Premium to about $41.67 a month, with higher tiers running past $200 for teams burning through heavy usage. As a primary tool the switching overhead defeats the purpose. As a gut check, when you suspect a single model is not giving you its best output, it earns the login.
Two more worth knowing but not carrying on their own: Perplexity does citation-backed web research better than any of the five above, and Gemini is the same lock-in play as Copilot for anyone living inside Google Workspace instead of Microsoft 365.
Most buyers are not really choosing between all five. They are choosing between ChatGPT and Claude, because those two cover the widest range of general work and now cost almost the same at the entry tier: $20 a month for Plus, $17 to $20 for Pro.
Pick ChatGPT's Plus tier if the job changes daily: drafting, brainstorming, quick research, image generation, and a plugin ecosystem most competitors do not match. Pick Claude's Projects setup if the job is the same large thing for days or weeks: a codebase, a compliance document, a research thread that keeps evolving, where a 200,000-token window holds the thread better than ChatGPT's shorter default.
The gap that used to separate them, price, is mostly gone. What is left is genuinely a workflow question, not a brand preference.
Switching between them costs more than people expect. Custom instructions, saved chats, connected apps and any fine-tuned prompt library live on one side or the other, and none of it moves automatically. Anyone who has built real workflow around a tool over a few months should weigh that migration cost against the marginal capability gap before jumping, not just the sticker price of the subscription.
Anyone whose employer already pays for Microsoft 365 or Google Workspace, and who only needs occasional help with email or spreadsheets, should stop here. The tier bundled into that subscription covers the use case without a second bill. Buying a standalone ChatGPT or Claude plan on top of an unused Copilot seat is the single most common waste in this category, and nobody notices until an expense audit finds it.
The same logic applies to light, occasional use. The free tiers of ChatGPT, Claude and now Grok cover most one-off tasks without a subscription at all. A paid plan earns its cost once volume or context length outgrows what the free tier allows, not before.
There is a third group worth naming: anyone whose work genuinely cannot leave a specific compliance boundary. None of the five tools here is positioned as a self-hosted or air-gapped option, and none of their consumer pricing pages make promises about data residency strong enough to satisfy a regulated industry on their own. That decision belongs in a conversation with legal or security, not in a subscription comparison.
The advice this guide gave in March was to run a primary tool plus one or two specialists. That advice has a real cost: three logins, three billing cycles, and the mental overhead of remembering which tool handles which task.
Most people who claim to run three tools strategically are actually paying for three and defaulting back to one out of habit, the exact failure this guide exists to fix. The advice still holds, with one condition attached now that it did not carry in March: only add a second subscription if you can name the specific task the primary tool cannot do. If the honest answer is "just in case," stay on one tool and use the others' free tiers as the occasional fallback instead.
The constant in this category is not the leaderboard. It is ecosystem lock-in. Grok folding real-time X search into its free tier is the kind of move that resets a comparison overnight, and xAI's shift under the SpaceXAI brand in 2026 suggests more distribution changes are coming, not fewer.
Before renewing any subscription on this list, revisit the three questions at the top of this guide rather than the brand name on the invoice. The tool that wins your ecosystem, task and constraint in 2027 is unlikely to be the one currently occupying the browser tab out of habit.
There is no single best AI assistant; it depends on ecosystem, task and budget. ChatGPT Plus costs $20 a month and covers the widest range of daily tasks. Claude costs the same but holds a 200,000-token context window across every tier, which suits long documents and code better.
ChatGPT is broader, covering brainstorming, image generation and a large plugin ecosystem for around $20 a month on the Plus plan. Claude is narrower but deeper: every consumer tier runs a 200,000-token context window, and its Projects feature keeps files persistent across a long task.
Microsoft 365 Copilot is priced as an add-on starting at $18 a user per month billed yearly, or bundled into Business Premium at $32 a user per month, according to Microsoft's pricing page. That is roughly the same range as ChatGPT Plus or Claude Pro, but only pays off if the buyer is already inside Microsoft 365.
Yes. As of x.ai's current pricing page, Grok's free $0 tier already includes real-time web and X search. The paid SuperGrok tier at $30 a month adds the Grok 4.5 model, higher rate limits, and image and video generation on top of that.
Only if a second subscription solves a specific task the first tool cannot. Most people who run three tools are actually paying for three and defaulting back to one out of habit. A single primary tool plus the free tiers of the others as fallback covers nearly every case.
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