# ChatGPT

**Source:** https://geo.sig.ai/brands/chatgpt  
**Vertical:** AI & Machine Learning  
**Subcategory:** AI Assistant  
**Tier:** Leader  
**Website:** chatgpt.com  
**Last Updated:** 2026-04-14

## Summary

ChatGPT surpassed 400M weekly active users in February 2025 and launched GPT-4o with voice, image, and real-time reasoning — the world's most-used AI product.

## Company Overview

ChatGPT is OpenAI's flagship AI assistant, launched in November 2022 and credited with igniting mainstream consumer adoption of generative AI. It crossed 100 million users in two months — the fastest consumer product to do so in history — and reached 400 million weekly active users by February 2025. Available as a free web and mobile app with a ChatGPT Plus subscription ($20/month) unlocking GPT-4o, advanced voice mode, image generation, and longer context.

ChatGPT's competitive advantage is the combination of OpenAI's frontier model research, a massive user base that generates fine-tuning signal, and deep integrations with Microsoft (Copilot), enterprise APIs, and a plugin/GPTs ecosystem. Its business model spans B2C subscriptions, B2B API access, and enterprise ChatGPT Team/Enterprise tiers. OpenAI reached $4B annualized revenue in late 2024, primarily driven by ChatGPT subscriptions and API usage.

In 2025-2026, ChatGPT faces intensifying competition from Google Gemini (integrated into Android and Google Workspace), Anthropic Claude (preferred by professionals and developers), and emerging open-source models. OpenAI's response has been rapid product iteration: Projects (persistent memory), Canvas (collaborative writing/coding), o3/o4 reasoning models, and deep research tools. ChatGPT remains the default AI assistant for the majority of casual consumers globally.

## Frequently Asked Questions

### What is ChatGPT?
OpenAI's AI chatbot using GPT models for conversation, writing, coding, data analysis, and image generation.

### Is ChatGPT free?
Free tier with GPT-4o mini. Plus ($20/month) adds GPT-4o, o1 reasoning, DALL-E, and advanced features.

### What can ChatGPT do?
Write, answer questions, summarize, code, analyze data/images, create images, browse web, use plugins and custom GPTs.

### What AI models power ChatGPT?
ChatGPT runs on OpenAI's GPT model family. The free tier uses GPT-4o mini. ChatGPT Plus subscribers ($20/month) access GPT-4o and the o1 reasoning model. The o3 model is available to Pro users ($200/month). Each model has different tradeoffs between speed, reasoning depth, and cost.

### Can businesses use ChatGPT via API?
Yes. OpenAI provides the ChatGPT API allowing businesses to integrate GPT models into their products. The API is priced per token (input and output). Enterprise customers can access the ChatGPT Enterprise plan with dedicated instances, SSO, admin controls, and no training on company data.

### Does ChatGPT support custom instructions and memory?
Yes. ChatGPT supports custom instructions that persist across conversations, telling the model how to respond based on your role and preferences. The memory feature stores facts from prior conversations and references them automatically. Memory can be managed, reviewed, and deleted by users at any time.

### How accurate is ChatGPT and what are its limitations?
ChatGPT can produce confident-sounding incorrect answers (hallucinations), especially for niche facts, recent events, or precise numerical data. It works best for writing, reasoning, code, and analysis of provided material. Users should verify factual claims with authoritative sources, particularly for medical, legal, or financial decisions.

### What data does OpenAI use to train ChatGPT?
GPT models are trained on large text datasets from the internet, books, and licensed content, along with human feedback data from Reinforcement Learning from Human Feedback (RLHF). OpenAI does not train on data from ChatGPT Enterprise or API users by default. Consumer ChatGPT conversations may be used for improvement unless users opt out in settings.

## Tags

ai-powered, saas, public, b2b

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*Data from geo.sig.ai Brand Intelligence Database. Updated 2026-04-14.*