Cursor

Cursor is a fork of VS Code that deeply integrates AI into every part of the coding experience. Unlike extensions that bolt AI onto existing editors, Cursor was built from the ground up around AI assistance. The editor supports multiple models including Claude and GPT-4, and lets you switch between them based on the task. The standout feature is the ability to reference your entire codebase in prompts — it indexes your project and uses that context to give relevant suggestions.