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The best AI assistants in 2026

Five AI assistants compared on what each is built for, where it runs and what the paid plans cost, from a $4.99 Google plan to tiers at $100 a month and up. Each pick says who it suits and where it stops.

Updated Oct 4, 2026 · 5 tools · How we pick

All five assistants here answer questions in a chat. The useful differences are elsewhere: where the answers come from, what the assistant can do besides chat and which other software it is tied to. Two are general-purpose assistants with image generation and voice conversations. One is aimed at writing, analysis and coding. One is a search assistant that lists its sources, and one answers from the sources you add to it.

Price separates them less than you might expect. Every one has a free plan, and every one has a paid tier at or near $20 a month. The cheaper options sit below that: Google AI Plus, which covers both Gemini and Gemini Notebook, is $4.99 a month, and ChatGPT Go is $8. Above $20, each has a high-usage tier that starts at about $100 a month or more.

The order below runs from the assistant that fits the most people to the ones built for a narrower job. Prices are the vendors' own, read on the date shown on each tool's page. The picks compare what each plan includes, not how well each model performs.

The shortlist

  1. 1ChatGPTBest all-rounder
  2. 2GeminiBest for Gmail, Docs and Drive users
  3. 3ClaudeBest for writing, analysis and coding
  4. 4PerplexityBest for cited answers from the web
  5. 5Gemini NotebookBest for answers from your own sources

The picks in detail

  1. 01

    ChatGPT

    Best all-rounderOpenAI's general-purpose AI assistant for chat, images and voice

    ChatGPT puts a broad set of jobs in one app: text chat, image generation, real-time voice conversations in the mobile app, web search and Deep Research reports. It has apps for web, Mac, Windows, iOS and Android, and the Free plan allows unlimited text chats. Paid plans start with Go at $8 a month. Plus, at $20 a month, adds advanced reasoning models, projects, custom GPTs and the Codex coding agent.

    Worth knowing: The Free plan limits uploads, image creation, voice chats, deep research and memory. OpenAI notes that Go may include ads, and Pro is sold at $100, $200 or $500 a month, well above Plus.

    Price
    Free plan; paid plans from $8 per month (Go)
    Runs on
    Web, macOS, Windows, iOS, Android
    ChatGPT pricing and detailschatgpt.com
  2. 02

    Gemini

    Best for Gmail, Docs and Drive usersGoogle's AI assistant, tied into Gmail, Docs and other Google apps

    Gemini fits people who already use Gmail, Docs, Drive and Google Calendar: it works with all four, and paid plans add Gemini inside Gmail, Docs and Vids. The free plan includes image generation, Deep Research and spoken conversations through Gemini Live. Google AI Plus, at $4.99 a month, is the lowest-priced paid plan among the five and comes with 400 GB of storage. Google AI Pro is $19.99 a month with 5 TB.

    Worth knowing: Paid tiers are Google AI plans that bundle storage and other Google services; no Gemini-only paid plan is listed. The plans require age 18 or over, and features vary by region and platform.

    Price
    Free plan; paid plans from $4.99 per month (Google AI Plus)
    Runs on
    Web, macOS, Windows, iOS, Android
    Gemini pricing and detailsgemini.google.com
  3. 03

    Claude

    Best for writing, analysis and codingAnthropic's AI assistant for writing, analysis and coding

    Claude is aimed at writing, analysis and coding. It can create files, run code and present the results as Artifacts on the Free plan, which also includes web search and memory. Every paid plan includes Claude Code, a coding agent for the terminal, VS Code and JetBrains. Pro is $17 a month on an annual subscription, or $20 billed monthly. Claude is the only assistant here that lists a Linux app.

    Worth knowing: Usage is capped in rolling five-hour sessions on every plan, and paid plans add weekly limits. Projects, Research and Claude Code are not in the Free plan, and the Linux desktop app is in beta.

    Price
    Free plan; paid plans from $17 per month with an annual subscription ($200 billed up front)
    Runs on
    Web, macOS, Windows, Linux, iOS, Android, Browser extension
    Claude pricing and detailsclaude.com
  4. 04

    Perplexity

    Best for cited answers from the webAI search assistant that answers questions with cited sources

    Perplexity is built around search: it answers a question from current web content and lists the sources used for each answer, and follow-up questions in the same thread build on the earlier ones. Labs turns a request into a finished report or project rather than a short answer. Pro adds deep research and a choice of AI models for $17 a month when billed annually, or $20 a month on the US App Store.

    Worth knowing: The plans page does not spell out the free plan's limits and quotes annual-billing prices only. Pro and Max are described as for personal use only, and no Mac or Windows app is listed.

    Price
    Free plan; paid plans from $17 per month when billed annually ($20 a month on the US App Store)
    Runs on
    Web, iOS, Android, Browser extension
    Perplexity pricing and detailsperplexity.ai
  5. 05

    Gemini Notebook

    Best for answers from your own sourcesGoogle's AI research assistant that answers from your own sources

    Gemini Notebook, formerly NotebookLM, answers from material you choose. Add PDFs, Google Docs, websites, YouTube videos or audio files, then chat with the notebook and get answers with in-line citations back to those sources. It also turns sources into audio and video overviews, mind maps, flashcards and quizzes, which suits students and researchers working from their own documents. The free Standard tier allows 100 notebooks with 50 sources each.

    Worth knowing: Higher limits are not sold on their own: they come with a Google AI Plus, Pro or Ultra subscription. The mobile app cannot yet generate or view notes, mind maps or reports, and no desktop app is listed.

    Price
    Free plan; paid plans from $4.99 per month (Google AI Plus)
    Runs on
    Web, iOS, Android
    Gemini Notebook pricing and detailsnotebook.google

How to choose

Start with where the answers should come from

ChatGPT, Claude and Gemini are general chat assistants; ChatGPT and Claude list web search, and all three have a research mode for longer investigations. Perplexity is search first: it answers from current web content and lists the sources for each answer. Gemini Notebook answers from the sources you add, with in-line citations back to them. If you need to see where a statement came from, the last two are built for it.

Check what it does besides text

ChatGPT and Gemini both list image generation and spoken conversations, and Gemini can also create or edit video from a description. Claude creates files, runs code and presents the results as Artifacts. ChatGPT and Claude each describe a coding agent on paid plans: Codex from ChatGPT Plus, and Claude Code on every paid Claude plan. Gemini Notebook turns sources into audio and video overviews, mind maps and quizzes.

Look at the software around it

Gemini works with Gmail, Drive, Docs and Calendar, and its paid plans bundle Google storage. Claude connects to tools such as Slack and Google Workspace, with Chrome and Microsoft 365 extensions on paid plans. For devices, ChatGPT, Claude and Gemini have Mac and Windows apps, and Claude alone lists Linux. Perplexity and Gemini Notebook list no desktop app.

Compare the plan you would actually buy

About $20 a month buys ChatGPT Plus ($20), Claude Pro ($20 billed monthly, or $17 a month billed annually), Google AI Pro ($19.99) or Perplexity Pro ($20 on the US App Store, or $17 a month billed annually). Below that, Google AI Plus is $4.99 a month and ChatGPT Go is $8. For a team, ChatGPT Business and Claude Team are each $20 per user a month billed annually and start at 2 users.

Common questions

Which AI assistants are free?

All five have a free plan. ChatGPT's allows unlimited text chats, with limits on uploads, image creation and voice chats. Claude's includes web search, file creation and code execution, with usage that resets on a rolling five-hour window. Gemini's is free with a Google Account and includes image generation and Deep Research. Gemini Notebook's free tier allows 100 notebooks, and Perplexity is free to use with cited answers.

Which AI assistant has the cheapest paid plan?

Google AI Plus is the lowest at $4.99 a month; it raises usage limits in both Gemini and Gemini Notebook and includes 400 GB of storage. ChatGPT Go is $8 a month. Claude Pro and Perplexity Pro are each $17 a month when billed annually.

Which AI assistants have desktop apps?

ChatGPT, Claude and Gemini have Mac and Windows apps. Claude also lists a Linux app, which is in beta, and Gemini's macOS app requires Apple Silicon and macOS Sequoia (15.0) or later. Perplexity and Gemini Notebook list web, iOS and Android apps, and Perplexity also has a browser extension.

Which AI assistant is best for research with sources?

Perplexity and Gemini Notebook are both built around citations. Perplexity answers from current web content and lists the sources used for each answer. Gemini Notebook answers from the PDFs, documents, websites and videos you add, with in-line citations that point back to them.

Which AI assistants have offers for students?

Google's US subscriptions page says college students get a free Google AI Pro plan for one year, which covers Gemini and the Pro tier of Gemini Notebook. Anthropic offers a university-wide Education plan for Claude, arranged with institutions, and ChatGPT lists an Enterprise & Edu plan sold through sales.

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