ChatGPT is OpenAI’s flagship AI assistant, built on the GPT-6 model family (GPT-6.1 Sol, GPT-6 Astra and GPT-6 Luna). It handles everyday chat, document analysis, coding, image creation and voice conversations, and has grown into a full work platform with Projects, scheduled tasks and custom GPTs.
The 2026 line-up spans a free tier, a low-cost Go plan at $8/month, Plus at $20/month and three Pro tiers from $100 to $500/month for heavy research and Codex workloads. Deep research, agent modes and the Codex coding agent make it the most complete general-purpose assistant for most people.