AI Dev Weekly is a Thursday series where I cover the week's most important AI developer news, with my take as someone who actually uses these tools daily.

Microsoft Build 2026 was the story of the week. Seven in-house AI models — none trained on OpenAI data. A Surface mini PC with NVIDIA RTX Spark inside. Claude Code licenses cancelled, developers pushed to Copilot. This was Microsoft saying, loud and clear: we don't need OpenAI anymore. Meanwhile MiniMax dropped the first open-weight frontier multimodal model, and NVIDIA unveiled hardware that makes local AI actually practical.

1. Microsoft Build 2026: 7 models, zero OpenAI dependency

Microsoft unveiled its MAI (Microsoft AI) model family at Build on June 2. The headline: MAI-Thinking-1 — a 35B reasoning model trained entirely on commercially licensed enterprise data with no distillation from GPT or any OpenAI model. It matches Claude Sonnet 4.6 on key benchmarks at up to 10× better cost efficiency.

Other MAI models announced: