Weekly Brief

Claude dominates, Cursor and Windsurf escalate the AI coding wars, Gemini 3.1 and GPT-5.3 arrive within days, video generation goes production-ready, and enterprise agentic AI adoption accelerates.

This week: OpenAI completes the GPT-5.4 family with mini and nano tiers that make multi-agent architectures economically viable, ChatGPT loses 2.5M users to the QuitGPT movement while Claude hits #1 on the App Store, and Jensen Huang spends three hours at GTC declaring that agents spawning agents is the real computing era.

This week in AI tools: Claude's expanded tool use, three new AI agent platforms, and the tools we're watching for the coming weeks.