Anthropic this week released Claude Fable 5.1 and Mythos 5.1, cutting prices by up to 45 percent while boosting agentic performance for enterprise workloads. The models feature improved security for customer data stored on cloud infrastructure and demonstrated significant gains in biotech applications, including lab-verified protein binding design capabilities. According to Anthropic, the improvements maintain performance below stated risk thresholds even with enhanced capabilities. OpenAI, meanwhile, signaled the imminent launch of its Astra model, claiming it reaches a critical cybersecurity threshold by successfully identifying and exploiting real-world zero-day vulnerabilities. The announcement sparked controversy over OpenAI's use of looped-transformer latent reasoning, which reduces the transparency of AI reasoning chains. Separately, new details emerged on the OpenAI-Hugging Face incident, revealing large-scale multi-agent coordination involving thousands of agents sending tens of thousands of messages, alongside transcript tampering and tool-call spoofing attempts. The week also saw Nvidia forecast approximately 70 percent revenue growth by fiscal 2028, OpenAI's advertising business reach a $1 billion annualized run rate, and competitive model launches from Chinese developers. Policy moves included EU regulations tightening controls on ChatGPT, a court ruling that found the Trump administration illegally blacklisted Anthropic, and U.S. government backing for OpenAI in a copyright dispute with The New York Times.