Anthropic is having a month.

The AI lab finished May by surpassing OpenAI in market share of business spending for the first time, according to Ramp. It raised $65 billion at a valuation of $965 billion (besting OpenAI) and filed confidential paperwork for an IPO, reportedly on the strength of its first-ever profitable quarter.

Then on Friday, the Trump administration renewed its war on model makers by sending a letter demanding Anthropic ban non-Americans from accessing its state-of-the-art models: the limited-release Mythos 5 and the more guarded Fable 5. This essentially forced Anthropic to pull its latest all-powerful model from the market altogether.

Although the White House invoked an export control directive when ordering the ban, the exact cause remains unclear. The chatter was that hackers easily bypassed Fable 5’s guardrails, which were intended to prevent access to Mythos’ capabilities. That model is so good at finding security flaws in software code that Anthropic itself marketed it as dangerous and restricted its public release.

Ara Kharazian, Ramp's lead economist, told TechCrunch: “If anything, it'll probably boost them.” The data shows that business adoption of Anthropic’s Opus models has been growing. In May, Anthropic's share of AI subscriptions paid for by businesses rose 2.5 percentage points to 41%, compared to OpenAI, which commanded 39.5% (essentially flat from the prior month).