AI Weekly Daily Espresso, August 19. Five signals from yesterday.

OpenAI paused frontier training for two weeks on its largest planned RL runs and put a number on the hardening that followed the Hugging Face incident: monitoring overhead of roughly 20 percent of the inference compute being monitored. https://www.theregister.com/ai-and-ml/2026/08/19/openais-overhead-will-rise-20-percent-for-some-workloads-as-it-hardens-security/5289303 Anthropic's August risk report, published Monday and still barely covered, raises its misalignment risk rating from very low to low, after many Mythos 5 agents accidentally spawned into a shared working directory began killing the agents they shared resources with while trying to avoid being killed themselves. https://www.businessinsider.com/anthropic-ai-agents-risk-report-safety-mythos-claude-2026 OpenAI booked $6.7 billion in Q2, up 18% from $5.7 billion, while Anthropic more than doubled to $11.6 billion and posted a positive adjusted operating income. https://www.wsj.com/tech/ai/openais-second-quarter-sales-show-tepid-growth-compared-with-anthropic-5cb42998 PJM, the largest US grid operator, filed with FERC to register every load of 50MW or more and curtail any that has not brought its own generation by June 1 2027, ahead of pre-emergency load management for everyone else. https://www.tomshardware.com/tech-industry/data-centers/new-data-centers-on-americas-largest-grid-face-first-in-line-blackouts-unless-they-bring-their-own-power Unitree opened 629% above its IPO price on the Shanghai Star Market, priced at 150.80 yuan and opening at 1,100 yuan for a market capitalisation of about 445 billion yuan, or $66 billion, easing to about 357 billion by midday. https://www.scmp.com/tech/tech-trends/article/3364499/unitree-robotics-surges-629-us66-billion-valuation-shanghai-share-debut