Windsurf is Codeium's AI-first IDE - a VS Code fork with deep AI integration built from the ground up rather than added as a plugin. Its Cascade feature is an agentic AI system that can understand your entire repository, perform multi-file edits, run terminal commands, and execute multi-step tasks autonomously. The Supercomplete feature generates intelligent completions that account for actions you haven't taken yet - not just what you've typed, but what you're likely to do next based on context. The preview model gives users access to Codeium's frontier coding models before they're publicly released. For developers evaluating the AI-first IDE category alongside Cursor, Windsurf is the primary competitor - with a differentiated approach to agentic coding and a growing model ecosystem.