GitHub Copilot and Sourcegraph Cody are two prominent AI-powered developer tools that offer sophisticated code completion and AI assistance. GitHub Copilot provides real-time code suggestions across multiple programming languages, with a focus on context understanding from your codebase, while Sourcegraph Cody offers context-aware code completion with a focus on maintaining consistency with existing codebases. Both tools have chat interfaces that provide natural language coding assistance, code explanations, debugging help, and architecture suggestions. However, GitHub Copilot excels in individual developer productivity due to its seamless IDE integration and terminal support, whereas Sourcegraph Cody shines in enterprise environments with its comprehensive context understanding, multi-repository support, and advanced security features. The choice between the two ultimately depends on your specific needs regarding repository access, team size, and security requirements.