Claude Code in the Wild, Vercel's Chat SDK Expands, and OpenAI on Safe Codex

Simon Willison's hands-on Claude Code experiments are yielding concrete patterns for PMs who build with AI tools — particularly around HTML as a surprisingly durable output format. Vercel's Chat SDK is quietly expanding its surface area (Messenger adapter, web adapter, conversation history all in one day), and OpenAI published its internal Codex safety model — which is less about security theater and more about what responsible agentic deployment actually looks like in practice.