Anthropic ships Claude Fable 5.2 and Mythos 5.2, faster and cheaper, days before a $1 trillion IPO
On November 9, 2026, Anthropic released Claude Fable 5.2 and Mythos 5.2, its first frontier models since Dario Amodei called to slow the pace of AI development. They are faster and cheaper than the 5.1 generation and aimed at cutting-edge use cases, but the system card flags a prompt-injection regression to watch.