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The Most Used AI Chatbots in 2025: Analysis, Adoption, and Practical Usage


With hundreds of millions of users globally, AI chatbots are no longer experimental—they are integrated into productivity tools, messaging platforms, and daily workflows.

1. At a Glance: Usage and Reach

Chatbot

Monthly Active Users

Key Platforms & Ecosystem

Distinguishing Feature

Meta AI

~1 billion

Facebook, Instagram, WhatsApp, Messenger

Social integration and mass reach

ChatGPT (OpenAI)

500 million

Web, mobile, API, enterprise

Multimodal, file analysis, coding

Google Gemini

400 million

Gmail, Docs, Android, Pixel

Workspace, real-time web search

DeepSeek

97 million

Web, API, open-source

Multilingual, cost-effective LLM

Microsoft Copilot

20–30 million

Word, Excel, PowerPoint, Teams, Outlook

Enterprise productivity, automation

Claude (Anthropic)

19 million

Claude.ai, Slack, API

Long context, document analysis

Perplexity AI

15 million

Web, app, browser extension

Factual, citation-backed Q&A

Pi (Inflection AI)

1 million (DAU)

Web, iOS, Android

Empathetic, emotional support


2. Meta AI

Meta AI has emerged as the world’s most widely used AI chatbot, reaching an estimated 1 billion monthly users as of 2025.Integrated across Facebook, Instagram, WhatsApp, and Messenger, Meta AI appears wherever users interact in Meta’s vast ecosystem. Its core function is to facilitate natural, conversational assistance inside chats—whether answering general questions, suggesting products, helping draft messages, or providing instant search results.


Key Strengths and Adoption Factors

  • Instant Accessibility: By embedding AI directly into the apps people already use daily, Meta ensures minimal friction; users can invoke the chatbot without separate logins or new platforms.

  • Diverse Use Cases: From customer support and shopping recommendations to meme generation and everyday Q&A, Meta AI covers a wide spectrum of light, fast tasks.

  • Business Integration: Brands and creators use Meta AI for automating customer responses in Messenger or WhatsApp, handling high message volumes and improving response times.

  • Scale: The integration strategy means that even casual social media users—sometimes unknowingly—interact with Meta AI every day.


Example Use Case

A user on Instagram receives a product question in DMs. Meta AI provides an instant, relevant suggestion based on catalog info, and can even draft a reply for the seller to send.


3. ChatGPT (OpenAI)

ChatGPT remains one of the most versatile and broadly adopted AI chatbots, serving 500 million monthly users globally. As of 2025, GPT-4o (“omni”) is the default model, succeeding the original GPT-4.


Key Features and Usage Patterns

  • Multimodal Capability: GPT-4o can process and generate text, analyze files (PDFs, Excel, CSV), interpret images, and even process audio. This makes it uniquely flexible for both personal and professional use.

  • Individual Productivity: Students and freelancers use ChatGPT for everything from homework help to coding projects, writing assistance, email drafting, and data analysis.

  • Business & Enterprise: Organizations use ChatGPT Team and Enterprise plans to automate document review, generate internal reports, summarize research, and even support HR functions.

  • API and App Integration: Businesses and developers embed ChatGPT in their products and websites, powering customer support bots, help desks, and advanced search tools.


Example Use Case

A marketing professional uploads a 30-page PDF report to ChatGPT, receives a summary, actionable insights, and even visual data extracted—all in one session.


4. Google Gemini

Gemini, Google’s flagship AI, has rapidly grown to 400 million monthly users, largely due to its deep integration with Google Workspace and Android devices.


Key Features and Integration Points

  • Productivity Suite Automation: Gemini automates drafting, summarizing, and formatting within Gmail, Docs, Sheets, and Slides. It is particularly valued for real-time email thread summarization and document clean-up.

  • Live Search and Knowledge: Unlike most closed LLMs, Gemini can pull in real-time web data, providing up-to-date answers and context-aware suggestions.

  • Mobile and Voice: Gemini powers the next generation of Google Assistant on Pixel and Android devices, blending voice, vision, and text for seamless everyday help.

  • Global Reach: Native to Google’s ecosystem, Gemini is accessible to anyone with a Google account, spanning both free and paid (Gemini Advanced) tiers.


Example Use Case

A user on Android highlights a confusing email thread in Gmail, asks Gemini to summarize, and instantly receives the key points with next steps.


5. DeepSeek

DeepSeek is a China-based AI model making significant inroads, especially in Asia and among developer communities. With nearly 100 million monthly users, it’s valued for both its performance and affordability.


What Sets DeepSeek Apart

  • Multilingual & Code-Centric: DeepSeek supports a wide range of languages and is optimized for programming tasks, making it popular in education and software development.

  • Open Source & Local Hosting: Unlike many Western LLMs, DeepSeek offers an open-weight model that organizations can download and deploy privately, ensuring compliance in regulated sectors.

  • Cost Efficiency: DeepSeek’s API is priced well below Western competitors, fueling adoption by startups and enterprises seeking scalable AI without prohibitive costs.


Example Use Case

A startup in India deploys DeepSeek locally to power its customer service chatbot in English, Hindi, and Mandarin—all while retaining full control over user data.


6. Microsoft Copilot

Microsoft Copilot is a major force in enterprise productivity, with 20–30 million active users. Unlike chatbots embedded in social or messaging apps, Copilot’s value is in workplace automation.


Core Usage and Business Benefits

  • Office Suite Integration: Copilot generates Excel formulas, summarizes Teams meetings, drafts Word documents, and builds PowerPoint presentations—directly inside Microsoft 365.

  • Enterprise Security: As part of Microsoft’s trusted business cloud, Copilot meets compliance needs for data handling, audit trails, and privacy.

  • Cross-Departmental Impact: Copilot is used in finance (for modeling and forecasting), HR (for policy drafting and onboarding), operations (for reporting), and more.

  • Efficiency Gains: Businesses report measurable time savings and productivity boosts, with many organizations citing up to six hours saved per employee per week.


Example Use Case

A project manager asks Copilot in Teams to summarize a week’s meeting notes, automatically extracting action items and deadlines for the whole team.


7. Claude (Anthropic)

Claude, especially in its Claude 3 Opus and Sonnet versions, serves around 19 million monthly users and is especially trusted for document-heavy and compliance-sensitive work.


Differentiators and Strengths

  • Long Context Window: Claude processes and retains information from extremely long documents (over 200,000 tokens), making it uniquely capable for legal, regulatory, or academic reviews.

  • Safe and Respectful AI: Designed with safety in mind, Claude minimizes inappropriate or off-topic outputs, making it a top choice for institutions where tone and reliability matter.

  • Professional Integration: Used by legal firms, consultants, and publishers for contract review, policy summarization, and comparison of large text files.

  • API/Platform Flexibility: Claude can be accessed via web app, API, or integrated into business dashboards and messaging platforms like Slack.


Example Use Case

A legal department uploads a lengthy contract and asks Claude to flag risk clauses and summarize obligations, reducing review time from hours to minutes.


8. Perplexity AI

Perplexity AI, with 15 million monthly users, has carved a niche as the “AI-powered research assistant,” blending conversational interaction with real-time, citation-backed search.


Key Capabilities

  • Factual, Transparent Answers: Every response is sourced, allowing users to verify facts and follow up on references.

  • Academic and Business Research: Widely used by students, journalists, and analysts for gathering, comparing, and summarizing public information.

  • Browser and Extension Use: Perplexity’s browser integration enables on-the-fly research while reading or composing documents.


Example Use Case

A researcher asks Perplexity to compare market share data for two companies, receiving a concise answer with links to supporting reports and recent news.


9. Pi (Inflection AI)

Pi distinguishes itself not by productivity but by emotional intelligence. With around 1 million daily users, Pi’s primary audience seeks empathetic, supportive, and non-directive conversations.


Why Users Choose Pi

  • Mental Wellness Support: Pi is used for stress relief, gentle advice, and daily self-reflection, not technical tasks or hard productivity.

  • Natural Dialogue: Conversations feel more like chatting with a supportive friend or life coach than a search engine.

  • Experimentation in HR: Some companies are piloting Pi as a well-being assistant for employees, blending AI companionship with mental health resources.


Example Use Case

A remote worker checks in with Pi at the end of a stressful day, discussing feelings and receiving suggestions for relaxation and work-life balance.


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