What is ChatGPT?
ChatGPT is a free AI chatbot from OpenAI that answers questions and writes text in a conversation. It runs on large language models (the GPT series) that predict likely words. As of 2026-07, the Free plan is $0, with paid tiers Go ($8/mo), Plus ($20/mo), and Pro ($200/mo). It launched November 30, 2022.
Why — the first-principles explanation
ChatGPT is a friendly front door to a large language model. The model's core skill is predicting the next word from patterns it learned across enormous text data. Wrap that in a chat interface, and you can type a question and get a fluent, relevant reply generated one word at a time. The 'GPT' means Generative Pre-trained Transformer, describing exactly that: it generates text, it was pretrained on huge data, and it uses the transformer design.
What made ChatGPT feel like a leap wasn't just the raw model but the tuning to be helpful. After pretraining, humans rated responses and the model was fine-tuned (via reinforcement learning from human feedback) to follow instructions, stay on topic, and behave like an assistant rather than a raw autocomplete. That's why it can hold a conversation, remember earlier messages in the chat, and adjust when you ask for changes.
Its limits come from the same design. Because it outputs likely text rather than verified facts, it can hallucinate: state wrong information confidently. It also has a training cutoff and, in its base mode, doesn't browse the live web. So it's a powerful writing and reasoning aid, but you verify anything that matters.
An example that makes it click
Imagine a phenomenally well-read pen pal who can reply instantly on almost any topic, in any style you ask. Tell them 'explain photosynthesis to a 7-year-old' or 'rewrite this email to sound friendlier,' and a solid draft appears in seconds. That's ChatGPT.
The catch: this pen pal sometimes states a 'fact' with total confidence that turns out to be made up, because they're really just predicting what a good answer sounds like. So you enjoy the speed, but you fact-check the important bits yourself.
Key facts
- ChatGPT is a conversational AI chatbot created by OpenAI, publicly launched on November 30, 2022.
- It runs on OpenAI's GPT-series large language models, which generate text by predicting the next token.
- As of 2026-07, pricing is Free ($0), Go ($8/month), Plus ($20/month), and Pro ($200/month), with Business and Enterprise for teams.
- It was tuned with human feedback (RLHF) to follow instructions and behave like an assistant.
- Because it predicts likely text, ChatGPT can hallucinate confident but incorrect answers and has a knowledge cutoff.
▶ The 60-second explainer (script)
What is ChatGPT? It's an AI chatbot made by OpenAI that you talk to like a person. You type a question, and it writes back a clear, relevant answer. It launched in late 2022 and quickly became one of the fastest-growing apps ever. Under the hood, ChatGPT runs on a large language model. Its one core skill is predicting the next word from patterns it learned across a huge amount of text. Put that in a chat box, and it can explain topics, draft emails, write code, or brainstorm ideas, generating each reply one word at a time. What made it special was tuning it with human feedback to be genuinely helpful and follow instructions, not just autocomplete. One important limit: because it predicts likely words instead of checking facts, it can be confidently wrong. That's called hallucination. As of July 2026, the free plan costs nothing, and paid plans run from eight to two hundred dollars a month. Great assistant, but always verify what matters.
What authoritative sources say
People also ask
Is ChatGPT free?
Yes, there's a free plan. Paid tiers (Go $8, Plus $20, Pro $200 per month as of 2026-07) add higher limits and access to more capable models.
Who made ChatGPT?
OpenAI, an AI company. ChatGPT was released to the public on November 30, 2022.
What can I use ChatGPT for?
Writing and editing, summarizing, brainstorming, explaining topics, translating, and coding help, among many text-based tasks.
Can ChatGPT be wrong?
Yes. It predicts likely text, so it can state false information confidently. Always verify important facts from a trusted source.