Sources: at least two US federal agencies and three congressional committees have reached out to Anthropic to test Claude Mythos, quietly bypassing Trump's ban

New model: GPT-5.4-Cyber 'Today we're expanding this program by introducing additional tiers of access for users willing to work with OpenAI to authenticate themselves as cybersecurity defenders. Customers in the highest tiers will get access to GPT-5.4-Cyber, a model purposely fine-tuned for additional cyber capabilities and with fewer capability restrictions.'