ChatGPT Glossary

*OpenAI*'s consumer-facing AI assistant product, launched November 2022. The market-defining product that introduced the general public to large-language-model chatbots.

ChatGPT is OpenAI’s consumer-facing AI assistant product. The original version launched November 30, 2022, with an initial free tier built on the GPT-3.5 model, and reached 100 million users in two months — the fastest-growing consumer software product in history at the time. The product has since gone through multiple model upgrades (GPT-4 in March 2023, GPT-4o and GPT-4-Turbo in 2024, GPT-5 in 2025), the addition of voice, image generation, web browsing, file uploads, custom GPTs, and the broader ChatGPT Plus/Team/Enterprise/Education subscription tiers.

For this Dictionary, ChatGPT is the market-defining product — the AI experience the general public knows, and the comparator readers commonly use when trying to understand another AI product. Its November 2022 launch was a watershed because it placed a capable large-language-model interface in front of a mass audience.

ChatGPT also helped establish familiar interface conventions for AI applications: threaded conversation, a text box, a Send button, and options to regenerate or revise an answer.

See also

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