What ChatGPT is, and which plan to use
How the models work now, and the plans — with durable logic.
ChatGPT is OpenAI's AI assistant — the most widely used one. You type (or speak) a request in plain language and it responds. It's multimodal: it handles text, images, voice, and files, can browse the web, and can run code. It's available on the web (chatgpt.com), desktop apps, and mobile. This lesson orients you on how the models work and which plan to choose — teaching the durable logic since specifics change monthly.
How the models work now (durable logic). Under the hood, ChatGPT runs several models but usually auto-picks one for your request — you often don't choose. The durable idea to learn: there's a fast everyday model for most tasks and a slower 'Thinking'/reasoning model for hard problems, and ChatGPT routes automatically (with paid plans letting you override in a model picker). Specific model names (the 'GPT-5' generation and its variants) change often, so don't memorize them — just know 'there's a fast one and a thinking one, usually chosen for me, and I can pick a reasoning model for hard tasks.' (Verify current model names on OpenAI's site.)
The plans (verify current — prices and details shift). ChatGPT has a free tier and several paid tiers:
- Free — chat with the everyday model, plus limited access to uploads, image generation, voice, web search, and data analysis. Genuinely capable for learning and light use.
- Go — a lower-cost tier with expanded access (more messages, uploads, features).
- Plus (~$20/mo) — the popular upgrade: the advanced reasoning model, much more usage, Projects, scheduled tasks, the ability to create Custom GPTs, and more.
- Pro — much higher usage and the most capable variants, for heavy users.
- Business / Enterprise — for organizations, with admin controls and — importantly — no training on your data by default (a privacy plus for work).
(Verify current plans and prices — OpenAI changes these regularly. Some free/low tiers may show ads; check current terms.)
How to pick. Start on Free to learn ChatGPT. Upgrade to Plus when you hit usage limits or want the advanced reasoning model, Projects, and the ability to build Custom GPTs — the most common upgrade. Consider Business/Enterprise for work with sensitive data (better data protections). Most people start free and upgrade to Plus when they feel the value.
The takeaway: ChatGPT is OpenAI's widely-used, multimodal AI assistant (text, images, voice, files, web, code) across web, desktop, and mobile. Learn the durable model logic — there's a fast everyday model and a slower 'Thinking'/reasoning model, usually auto-picked, with paid plans letting you choose a reasoning model for hard tasks — rather than memorizing model names, which change monthly. The plans: Free (capable for learning), Go (low-cost expanded access), Plus (~$20/mo — advanced reasoning, more usage, Projects, and creating Custom GPTs), Pro (heavy usage), and Business/Enterprise (org controls, no-training-by-default). Start free to learn, upgrade to Plus when you hit limits or want its features, and use business tiers for sensitive work. Verify current models, plans, and prices.
Set up: create a free ChatGPT account at chatgpt.com (and get the mobile or desktop app). Note the durable model logic — a fast everyday model and a slower 'Thinking' model, usually auto-chosen — and check OpenAI's site for current model names and plan prices. Decide: start free, with your upgrade trigger being hitting limits or wanting Plus features (reasoning model, Projects, building Custom GPTs).
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