ChatGPT

What ChatGPT is

ChatGPT is OpenAI's flagship conversational AI assistant, launched in November 2022 and now running on the GPT-6 Astra flagship with the GPT-5.6 family (Sol, Terra, and Luna) beneath it. Free accounts get unlimited text chats on GPT-5.6 Luna with limited access to tools, uploads, image generation, voice, and deep research; Plus and Pro add advanced reasoning models, expanded Codex usage, projects, scheduled tasks, and custom GPTs. It remains the most widely adopted consumer AI product in the world.

Key features

• Multimodal input and output (text, vision, voice, image generation)
• GPT-6 Astra flagship alongside the GPT-5.6 family (Sol, Terra, Luna)
• Advanced reasoning models with GPT-6 Astra and GPT-5.6 on Plus and above
• Projects, scheduled tasks, and custom GPTs
• Expanded Codex usage plus ChatGPT Work on desktop, web, and mobile
• Memory, a 1.05M-token context window on flagship models, and deep research

Where it lives

Sources & media

• ChatGPT pricing — individual, business, and enterprise plans · OpenAI (official)
• OpenAI model catalog — GPT-6 Astra and GPT-5.6 specifications · OpenAI (official)
• Introducing ChatGPT · OpenAI (official)
• OpenAI API documentation · OpenAI (official)