[Anthropic Launches Fable 5 and Mythos 5 Models] According to Bloomberg, Anthropic has released the new model Fable 5, which blocks cybersecurity and biology-related requests, transitioning such issues from Claude to Opus 4.8 for handling. At the same time, they introduced Mythos 5, which is only available to specific institutions covered under the Project Glasswing initiative. Anthropic previously stated that Mythos can identify and exploit vulnerabilities in major operating systems and web browsers under user guidance.