Sources: Anthropic declined to submit Mythos 5.1 to the UK AISI for pre-release testing, prompting UK fears that US AI labs are aligning with US protectionism (Financial Times)

Anthropic declined the UK AI Safety Institute’s request to evaluate its Mythos 5.1 model. OpenAI reported an internal model surpassing GPT-6 Astra that solved the Navier-Stokes existence problem using 10,000 agents over 88 hours, noting possible data contributions from Tristan Buckmaster and Levent Alpöge. Meta launched Muse, a personal AI agent on a dedicated cloud VM, initially available only in the United States.