Buyer's guide
Best AI Assistants
General AI assistants ranked by their BestStacked review scores, with what each one is best at and what it costs.
See each review for its verification date
ChatGPT is the best AI assistant for most people in 2026: it scores 9.1/10 in BestStacked's review and covers the widest range of jobs in one app. Claude (9.0) and Gemini (8.9) are close behind and are the better choice for long-form writing and for Google Workspace users respectively. This guide is for founders, marketers and operators choosing one general assistant. The ranking follows each tool's overall BestStacked review score, which weighs five stated criteria: ease of use (20%), features (25%), pricing and free-plan value (20%), support (15%), and integrations (20%). Within those scores, the things that matter most for an assistant are how many jobs it covers in one plan, what the free plan includes, what the first paid plan costs, whether a business plan keeps your data out of model training, and whether it works inside the apps you already use. Microsoft Copilot and Mistral Vibe (formerly Le Chat) don't have a full BestStacked review yet, so they're listed after the scored tools without a score. Every price and plan was checked on each vendor's own site on October 12, 2026. This is research, not hands-on testing. BestStacked has no affiliate program with any tool on this list, so the links below are plain vendor links.
The ranking
Top Best AI Assistants — Ranked
Rank reflects fit for this use case. Scores come from each tool's full BestStacked review; tools we haven't reviewed aren't scored. We've logged 6 price or plan changes for tools on this list: see the pricing tracker.
| Rank | Tool | Category | Starting Price | Best For | BestStacked Score | |
|---|---|---|---|---|---|---|
| #1 |  ChatGPT | General AI assistant | Free / $8 (Go) / $20 (Plus) | One assistant for writing, research, images, voice and code | Visit SiteRead Review | |
| #2 |  Claude | General AI assistant | Free / $20 (Pro) / $100 (Max) | Long-form writing, long documents and coding | Visit SiteRead Review | |
| #3 |  Gemini | General AI assistant | Free / Google AI Pro $19.99/mo / Workspace from $7/user/mo | People and teams whose work lives in Google Workspace | Visit SiteRead Review | |
| #4 |  Perplexity | AI answer engine | Free / Pro $17/mo billed annually | Research with a cited source for every claim | Visit SiteRead Review | |
| #5 |  DeepSeek | Free assistant and low-cost API | Free app; API from $0.15 per 1M input tokens | Free personal use and low-cost API work | Visit SiteRead Review | |
| #6 |  Grok | General AI assistant | Free; Plus $8/mo ($80/yr) | Live X and web search for heavy X users | Visit SiteRead Review | |
| #7 | Microsoft Copilot | Assistant built into Microsoft 365 | Free; Microsoft 365 Personal $9.99/mo | People who work in Word, Excel, Outlook and Teams | Not yet reviewed | Visit Site |
| #8 | Mistral Vibe (formerly Le Chat) | European AI assistant | Free; Pro $14.99/mo | Teams that want EU data hosting | Not yet reviewed | Visit Site |
ChatGPT
General AI assistant · Free / $8 (Go) / $20 (Plus)
The broadest assistant on this list: writing, analysis, image creation, voice, Codex and ChatGPT Work in one app. Go ($8/mo) and Plus ($20/mo) are billed monthly; Pro runs $100, $200 or $500 a month. Business is $20 per user a month billed annually or $25 monthly, with a 2-user minimum, and OpenAI doesn't train on business data by default. Free and Go may show ads.
Claude
General AI assistant · Free / $20 (Pro) / $100 (Max)
The closest rival to ChatGPT overall and the stronger pick for long-form writing, long-context analysis and coding, per BestStacked's ChatGPT vs Claude comparison. Pro is $20 a month or $17 billed annually; Max starts at $100. Team plans cover 2 to 150 seats from $20 per seat a month billed annually.
Gemini
General AI assistant · Free / Google AI Pro $19.99/mo / Workspace from $7/user/mo
Google's assistant, in the Gemini app and inside Gmail, Docs, Sheets and Drive. Google AI Plus costs $4.99 a month and Google AI Pro $19.99. Workspace business editions include Gemini from $7 per user a month billed annually, though Business Starter gets Gemini in Gmail rather than Docs.
Perplexity
AI answer engine · Free / Pro $17/mo billed annually
An answer engine that searches the live web and shows numbered sources, with models from several AI labs on paid plans. It's a research tool first rather than an all-purpose assistant, which is why it ranks below the three general assistants. Pro is $17 a month billed annually.
DeepSeek
Free assistant and low-cost API · Free app; API from $0.15 per 1M input tokens
A free chat app with no paid consumer plan, an API priced well below most US labs, and MIT-licensed open weights. DeepSeek's privacy policy says personal data is collected, processed and stored in the People's Republic of China, and it lists no business plan with admin controls, so keep client data out of it.
Grok
General AI assistant · Free; Plus $8/mo ($80/yr)
xAI's assistant, built into X, with live search across X posts and the web. Since October 12, 2026 it's sold through The X Subscription: Plus $8 a month, Premium $30, Super $100 and Ultra $200, bundling Grok, Cursor usage and X Premium benefits. xAI says Grok 4.5 powers the apps; Grok 3 has been retired from the API.
Microsoft Copilot
Assistant built into Microsoft 365 · Free; Microsoft 365 Personal $9.99/mo
Not yet reviewed on BestStacked. Copilot is free with a Microsoft account. Microsoft 365 Personal ($9.99/mo) adds Copilot in Word, Excel, PowerPoint and Outlook, and Premium ($19.99/mo) raises usage limits; Copilot Pro is no longer sold. For businesses, Microsoft 365 Copilot is $30 per user a month paid yearly.
Mistral Vibe (formerly Le Chat)
European AI assistant · Free; Pro $14.99/mo
Not yet reviewed on BestStacked. Mistral's assistant, now branded Vibe, has a free plan, Pro at $14.99 a month and Team at $24.99 per user a month. Mistral's help center says data is hosted in the European Union by default.
Our top picks
Featured Picks
ChatGPT
The broadest assistant on this list: writing, analysis, image creation, voice, Codex and ChatGPT Work in one app. Go ($8/mo) and Plus ($20/mo) are billed monthly; Pro runs $100, $200 or $500 a month. Business is $20 per user a month billed annually or $25 monthly, with a 2-user minimum, and OpenAI doesn't train on business data by default. Free and Go may show ads.
Claude
The closest rival to ChatGPT overall and the stronger pick for long-form writing, long-context analysis and coding, per BestStacked's ChatGPT vs Claude comparison. Pro is $20 a month or $17 billed annually; Max starts at $100. Team plans cover 2 to 150 seats from $20 per seat a month billed annually.
Gemini
Google's assistant, in the Gemini app and inside Gmail, Docs, Sheets and Drive. Google AI Plus costs $4.99 a month and Google AI Pro $19.99. Workspace business editions include Gemini from $7 per user a month billed annually, though Business Starter gets Gemini in Gmail rather than Docs.
Buying guide
How to Choose the Right Tool
Pick one general assistant and use it for a month before adding another. ChatGPT, Claude and Gemini overlap heavily, and paying for two rarely helps.
Start with your main job. Mostly long-form writing or long documents: Claude. Mostly Gmail and Docs: Gemini. Research you need to cite: Perplexity. A bit of everything: ChatGPT.
Price the assistant you may already pay for. Google Workspace business editions include Gemini, and Microsoft 365 Personal and Family include Copilot in the Office apps.
Use a business plan for company or client data. Business and team plans add admin controls and, for ChatGPT, no training on business data by default; personal plans usually rely on each user opting out.
Check monthly vs annual billing. ChatGPT Go and Plus are monthly only, while Claude Pro and Perplexity Pro are cheaper billed annually.
Methodology
How We Evaluate Tools
Editorial Research
Tools are compared on documented features, pricing, and fit. Each review notes its own verification date.
Ease of Use
We evaluate setup time, learning curve, and daily usability from a founder's perspective.
Pricing Transparency
We break down real costs including hidden fees, usage limits, and upgrade triggers.
Integrations & Ecosystem
We check how each tool fits into existing workflows and what it connects with natively.
Questions