Introduction to ChatGPT Beginner

ChatGPT is an AI chatbot developed by OpenAI that uses large language models to generate human-like text. Since its launch in November 2022, it has become the fastest-growing consumer application in history, transforming how people work, learn, and create.

What is ChatGPT?

ChatGPT is a conversational AI assistant built on OpenAI's Generative Pre-trained Transformer (GPT) models. It can understand and generate text, analyze images, write code, create images, browse the web, run code, and much more. You can interact with it through chat.openai.com, mobile apps for iOS and Android, a desktop app, or via the OpenAI API.

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Good to know: OpenAI was founded in 2015 as a non-profit AI research lab. Key founders include Sam Altman, Elon Musk, Ilya Sutskever, and Greg Brockman. The organization transitioned to a "capped-profit" model in 2019 and has since become one of the most valuable AI companies in the world.

The Evolution of GPT Models

ChatGPT has evolved rapidly through several major model generations:

Model Release Key Milestone
GPT-3 June 2020 175 billion parameters; demonstrated that scale unlocks emergent capabilities in language understanding
GPT-3.5 Nov 2022 Powered the original ChatGPT launch; fine-tuned with RLHF for conversational use
GPT-4 Mar 2023 Major leap in reasoning, coding, and instruction following; multimodal (text + image input)
GPT-4 Turbo Nov 2023 128K context window, cheaper pricing, knowledge cutoff updated, JSON mode
GPT-4o May 2024 Flagship multimodal model; natively handles text, vision, and audio; faster and cheaper than GPT-4
o1 Sep 2024 First "reasoning" model; uses chain-of-thought to solve complex math, science, and coding problems
o3 2025 Next-generation reasoning model with improved performance on benchmarks and real-world tasks

ChatGPT Plans

OpenAI offers several tiers to match different needs:

Plan Price Key Features
Free $0/month Access to GPT-4o mini, limited GPT-4o usage, basic features
Plus $20/month GPT-4o, o1-mini, DALL-E, browsing, Code Interpreter, custom GPTs, higher limits
Pro $200/month Unlimited access to all models including o1 pro mode, highest performance tier
Team $25/user/month Everything in Plus, shared workspace, admin console, no training on data
Enterprise Custom Unlimited GPT-4o, extended context, SSO, SCIM, admin analytics, dedicated support

Key Capabilities

ChatGPT is a versatile AI assistant that handles a wide range of tasks:

  • Conversation: Natural multi-turn dialogue with context retention across a session and optional long-term memory
  • Code Generation: Write, debug, explain, and refactor code in Python, JavaScript, TypeScript, and dozens of other languages
  • Vision: Analyze images, read text from photos, interpret charts, describe visual content
  • Image Generation: Create images with DALL-E directly in the chat interface
  • Web Browsing: Search the internet for up-to-date information and cite sources
  • Code Interpreter: Execute Python code in a sandbox for data analysis, math, and file processing
  • File Analysis: Upload and analyze PDFs, spreadsheets, images, and other documents
  • Voice: Have spoken conversations using advanced voice mode with natural speech

Plugins and GPT Store

OpenAI introduced Custom GPTs in November 2023, allowing anyone to create specialized versions of ChatGPT without writing code. The GPT Store launched in January 2024 as a marketplace for sharing and discovering these custom assistants.

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Custom GPTs replaced Plugins: The original ChatGPT plugin system was deprecated in favor of Custom GPTs, which are more flexible and easier to create. GPTs can include custom instructions, knowledge files, and API actions.

ChatGPT vs Other AI Assistants

How does ChatGPT compare to its main competitors?

Feature ChatGPT Claude Gemini
Developer OpenAI Anthropic Google
Strengths Ecosystem, plugins/GPTs, image generation, voice Long context (200K), safety, coding, instruction following Google integration, multimodal, large context
Image Generation DALL-E built-in Not available Imagen built-in
Code Execution Code Interpreter (Python sandbox) Not built-in (Claude Code for CLI) Code execution in Colab
Web Browsing Yes Limited Yes (Google Search)
Custom Agents GPT Store Not available Gems
Free Tier Yes (limited) Yes (limited) Yes (generous)

What You'll Learn in This Course

  1. Getting Started

    Access ChatGPT through the web, mobile apps, and API. Understand the interface, voice mode, and file uploads.

  2. Models & GPTs

    Understand GPT-4o, o1, o3, and other models. Create and use custom GPTs from the GPT Store.

  3. Prompting Guide

    Master system prompts, custom instructions, few-shot examples, chain of thought, and structured output.

  4. Use Cases

    Apply ChatGPT to writing, coding, data analysis, research, image generation, and more.

  5. API & Integration

    Use the OpenAI API with curl, Python, and Node.js. Implement function calling, streaming, and the Assistants API.

  6. Best Practices

    Learn safety guidelines, cost optimization, enterprise deployment, and common pitfalls to avoid.

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Prerequisites: This course assumes no prior AI experience. All you need is curiosity and a web browser. A free ChatGPT account is helpful but not required to follow along.
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