AI Weekly — 2026/04/10–04/17 | The Model Lockdown Is Here, but the Toolchain Is the Real Battleground

One-line summary: Frontier models are no longer public goods anyone can touch — Anthropic and OpenAI are tightening access in lockstep, and the real competition has shifted from "whose model is stronger" to "whose toolchain can get enterprises running under constraints." Model Releases Under Lockdown: The Different Bets of Opus 4.7 and Codex The Economist reports this week that Anthropic and OpenAI are restricting external access to their latest models. Against this backdrop, the st...