AI power infrastructure company SB Energy, which is backed by SoftBank, OpenAI, and Nvidia, files for an IPO, and says it is "substantially dependent" on OpenAI (CJ Haddad/CNBC)

SB Energy, the AI-focused power-infrastructure firm backed by SoftBank, OpenAI and Nvidia, has filed for an IPO and disclosed that its operations are “substantially dependent” on OpenAI’s technology. Anthropic launched Claude Fable 5.1 for general availability and Claude Mythos 5.1 for trusted partners, emphasizing advanced coding, knowledge-work capabilities and added cybersecurity and life-science safeguards.