Cursor

Cursor is a high-performance fork of VS Code, engineered from the ground up to integrate Large Language Models (LLMs) into the core developer workflow. Unlike traditional IDE plugins that operate as sidebars, Cursor treats the AI as a first-class citizen with deep access to the filesystem, terminal, and git history. Its technical architecture centers on a sophisticated codebase indexing system that creates local vector embeddings of your repository, enabling hyper-contextual responses via Retrieval-Augmented Generation (RAG). By 2026, Cursor has solidified its market position as the leading 'AI-native IDE,' moving beyond simple autocomplete to 'Composer' modes that generate entire multi-file features from natural language prompts. It supports cutting-edge models like Claude 3.5 Sonnet and GPT-4o, while offering a proprietary 'Cursor-Small' model for low-latency editing. The platform represents a shift from 'coding with AI assistance' to 'AI-driven system architecture,' where the developer acts as a high-level reviewer and orchestrator rather than a syntax writer.