Zscaler, Dynatrace, and Nutanix Stocks Are Falling, What You Need to Know

What happened?

Several stocks fell in the afternoon session after Anthropic released new models (Claude Fable 5 and Claude Mythos 5) that were described as built for “the toughest knowledge work and coding problems.”

Mythos had been restricted for about two months under Project Glasswing, a managed rollout to select governments and companies designed to contain their cybersecurity risk profile before a broader rollout. That’s important because the SaaSpocalypse thesis is reinforced every time a more capable AI agent arrives. When Anthropic launched Claude Cowork in January, it triggered a $285 billion drop in software stocks in a single session, with Goldman’s U.S. software basket falling. This is another iteration of the same logic: if an agent available for $20 a month can now complete multi-step knowledge work over the long term, the argument for more expensive per-seat enterprise subscriptions becomes harder to defend with each new generation of models.

Adding to the weakness, the US central…