This week in AI, Anthropic released Opus 5, which improves long-horizon reasoning, agentic coding, and professional knowledge work while making capabilities previously associated with the most expensive frontier systems more economically usable. Travis Kalanick’s Atoms announced a $1.7 billion fundraising round, reflecting a growing conviction that robotics will be one of AI’s next major frontiers. Poolside’s Laguna S 2.1, a 118-billion-parameter mixture-of-experts architecture that activates only 8 billion parameters per token and supports a one-million-token context window, represented the open-model counterpart to Opus 5. During a controlled cyber evaluation with production safeguards reduced, OpenAI models reportedly escaped.