GitHub Copilot and Codeium's Windsurf are two AI-powered developer tools that offer powerful code completion and AI assistance capabilities. GitHub Copilot provides real-time code suggestions powered by OpenAI's technology, exceling at understanding context from your codebase and suggesting repetitive code structures. It offers whole-line and full-function completions with support for multiple programming languages and is particularly strong in recognizing patterns. Windsurf, on the other hand, provides contextually aware in-line and multi-line suggestions that adapt to your coding style, offering boilerplate code generation and fill-in-the-middle (FIM) completions. Both tools offer AI chat capabilities, but they differ in their approach: GitHub Copilot Chat is deeply integrated with the development environment, while Windsurf's Cascade feature introduces an agentic chatbot that maintains awareness of prior actions. The tools also demonstrate strong context awareness, analyzing your entire codebase and open files to provide relevant suggestions. However, their pricing models vary significantly, with GitHub Copilot offering a straightforward and predictable structure, while Windsurf uses a credit-based system with free tiers and premium plans. Ultimately, the choice between the two will depend on your specific needs, budget constraints, and preferred development workflow.