What Is ChatGPT?
ChatGPT is a conversational AI system developed by OpenAI, first launched in November 2022. It reached 100 million users faster than any product in history. Built on the GPT (Generative Pre-trained Transformer) architecture, it engages in multi-turn conversations and can reason, write code, analyze data, and generate images.
The latest version uses GPT-4o—a multimodal model that processes text, images, and audio in a single unified architecture. The "o" stands for "omni," reflecting its ability to work across modalities seamlessly.
Key Features
- GPT-4o reasoning — Solves complex math, logic puzzles, and coding problems with step-by-step reasoning. Supports 128K context window.
- Image generation (DALL-E 3) — Generate and edit images from text descriptions directly in the chat interface. Available on Plus plan.
- Code Interpreter / Data Analysis — Upload CSV/Excel files, run Python code, generate charts, and perform statistical analysis without writing a line of code.
- Web browsing — Search the internet in real time for current events, news, and up-to-date information. Powered by Bing.
- Custom GPTs — Build or use community-created GPTs tailored for specific tasks: coding tutors, recipe generators, legal advisors, etc.
- Voice mode — Real-time voice conversations using Advanced Voice Mode, with low latency and emotional expression.
Pricing Plans
- GPT-4o mini (unlimited)
- Limited GPT-4o messages
- Limited web browsing
- Limited image generation
- 5× more GPT-4o messages
- DALL-E 3 image generation
- Advanced Data Analysis
- Custom GPTs
- Voice mode
- Web browsing unlimited
- Everything in Plus
- No training on your data
- Admin controls
- SSO
- Priority support
Use Cases
Coding & Development
ChatGPT is widely used for code generation, debugging, explaining code, writing documentation, and converting code between languages. The Code Interpreter lets developers prototype data pipelines and analyze logs directly in the chat.
Writing & Content Creation
Drafting emails, articles, marketing copy, social media posts, and creative writing. ChatGPT can match tone, expand bullet points into paragraphs, and help with SEO optimization.
Research & Analysis
Summarize long documents, extract key points, compare concepts, and synthesize information from multiple sources. With web browsing enabled, it can fetch and summarize current research.
Pros & Cons
Pros
- Best-in-class free tier
- Widest feature set in one interface
- GPT-4o is fast and capable
- Massive ecosystem of Custom GPTs
- DALL-E 3 image generation built-in
- Excellent Code Interpreter for data
Cons
- Free tier has usage limits
- Occasionally confidently wrong (hallucinations)
- Context resets between sessions
- No private/local deployment option
- OpenAI infrastructure outages occasionally
ChatGPT vs Claude
The most common alternative comparison. Both are excellent; the choice depends on your primary use case:
- For long documents & instructions: Claude edges out ChatGPT with its 200K context window and more careful instruction-following.
- For multimodal tasks: ChatGPT wins with DALL-E 3 integration, voice mode, and video input support.
- For coding: Very close. Claude Sonnet 4 and GPT-4o are both top-tier. Try both for your specific language.
- For research: ChatGPT's web browsing gives it an edge for current information. Claude performs better on document analysis.