VS Code 1.143 makes the Copilot harness the default and adds side-by-side model comparison
Released Oct 21, new agent sessions now run on the Copilot SDK-based harness, and a preview Compare Models mode in the Agents window runs one prompt across Copilot, Claude, and Codex harnesses with an optional judge model to score and synthesize results. Experimental on-device MAI Code 1.1 Flash skips AI credits but needs an NVIDIA GPU with at least 96 GB of memory (Visual Studio Magazine).
