I couldn't sleep, so I decided to build a Pulumi C# application that uses an existing MCP Server. My forms will utilise the client to allow me to access my Azure subscriptions and resources - wow. Build a really cool tool quickly - Claude Sonnet 4 is once again significantly better than GPT-4.1 for programming with GitHub Copilot.
Update Sept 2025: I'm now using GPT-5 over Claude Sonnet with GitHub Copilot when programming in VS Code. Both feel about the same quality to me.
GitHub have this for comparing AI models for GHCP, which is very useful.
I am using GPT-5-Codex, which "is a version of GPT-5 optimised for agentic coding in Codex".
I am also really liking GitHub Copilot code review
Anthropic's Claud 4.5 is also excellent..
