Anthropic Watch

Anthropic Watch: Week of May 19–29, 2026

Five stories in ten days: Anthropic's $65B Series H at a $965B valuation, Claude Opus 4.8 with honest-AI improvements and Dynamic Workflows, the $300M Stainless SDK acquisition that stripped a key shared tool from OpenAI and Google, Andrej Karpathy joining as pre-training lead, and Mythos-level cybersecurity models inching toward general release.