Master the world's leading AI platform. Learn ChatGPT essentials, Custom GPTs, the Assistants API, o1 reasoning models, and advanced prompt engineering.
Yes, 100% free. No sign-up, no credit card. All modules, lessons, and quizzes are immediately accessible. Progress saves locally in your browser.
The course covers ChatGPT essentials, Custom GPT creation, API integration, the Responses API, the Agents SDK, and the newly released GPT-5.6 family (Luna, Terra, Sol).
No prerequisites required for the first modules (ChatGPT and Custom GPTs). The later modules on the API and Agents SDK require basic programming knowledge, particularly in JavaScript or Python.
The Responses API is the new unified endpoint introduced in 2025/2026 that replaces both Chat Completions and the Assistants API, offering built-in tools like web search and native conversational memory.
Luna is the ultra-fast, cost-efficient edge model. Terra is the balanced daily driver offering GPT-5.5 level performance for cheaper. Sol is the flagship model with an 'Ultra' setting for complex parallel multi-agent orchestration.