GitHub Copilot Fusion is now generally available. Instead of picking a model per task, developers select Fusion and an effort level, and Copilot decides which models run and how they cooperate. Administrators can restrict which models Fusion may use and make it the default. It is available in VS Code, the GitHub Copilot app, Copilot CLI and JetBrains IDEs.
The GitHub Copilot app now offers Projects in public preview, a home for work that spans several repositories, sessions and non-code assets. Copilot can pull in Slack and Figma context and run multiple agents that return pull requests for review. A computer use preview on macOS and Windows lets it operate desktop apps that lack an API or MCP integration.
Simon Willison argues that October 2026 is when AI models became good enough at game design to make vibe coded games genuinely fun. He built four browser games mostly with Claude Opus 5.5 and shares the prompts and workflow he used. The post is a practical look at iterating with coding agents, and at where GPT-6 models still fall short.