Building a Microsoft Learn AI Agent with GitHub Copilot SDK and C#
Introduction I’ve been doing a lot of research on AI agents recently, exploring different frameworks, architectures, and models. The speed of innovation is incredible, especially the recently released Large Language Models (LLMs) Claude Opus 4.6 and Claude Sonnet 4.6, and OpenAI’s GPT 5.3 Codex. What I’ve found is that it really helps to try different models and see which one fits your use case best. For example, Claude Opus 4.6 and GPT 5.3 Codex really take the time to understand the codebase before making changes when you use them in agent mode, they analyze the full context, read related files, and plan their edits rather than jumping straight to code generation. However, one good thing I find very helpful is to make multiple iterations with different models and compare the results side by side to see which one is better for your specific use case. This also gives you more insight into how different models approach the same problem, which can be very valuable when you’re building for example an AI agent. It’s also a learning process. ...