AI Round-up: April 9, 2026

Anthropic's Claude Mythos restraint centred this snapshot. News outlets, YouTube coverage, and Reddit threads all circled the same question: what it means when Anthropic says its newest cybersecurity model is too powerful for open release, while the company also used the moment to explain Project Glasswing and the architecture behind Managed Agents.

A second strand tracked product and platform positioning elsewhere. OpenAI paired a child-safety blueprint with IPO-share allocation reporting and Codex context messaging, Google pushed Gemini notebooks and NotebookLM coverage, Perplexity pitched its Billion Dollar Build, and Meta re-entered the model race with the first release from its superintelligence team.