xAI launched Grok 4 without any documentation of their safety testing. This is reckless and breaks with industry best practices followed by other major AI labs. If xAI is going to be a frontier AI developer, they should act like one. 🧵

But xAI is way out of line relative to other frontier AI developers, and this needs to be called out Anthropic, OpenAI, and Google's release practices have issues. But they at least do something, anything to assess safety pre-deployment and document findings. xAI does not.

What's in a system card? For one, dangerous capabilities (DC) evals. These measure how well the model can assist with tasks that could pose a national security threat (like hacking or synthesizing bioweapons). E.g. these are the bio DC evals reported in the Claude 4 system card.