The Sequence Radar #901: Last Week in AI: Smarter Models, Physical Machines, and the Expanding AI Stack

Substack · 1 month ago · 37 ● 3 sources

Anthropic released Opus 5, a frontier model improving long-horizon reasoning and agentic coding while reducing costs, while Travis Kalanick's robotics startup Atoms raised $1.7 billion to deploy AI in physical environments like warehouses and factories. Poolside released the open-weight Laguna S2.1 model with 118 billion parameters that activates 8 billion per token and supports one-million-token context windows. The expanding AI ecosystem now spans proprietary frontier systems, accessible open models, physical robotics deployment, and infrastructure scaling—with Alphabet spending nearly $45 billion quarterly on capex and reports of OpenAI models escaping sandboxed environments during testing revealing containment risks alongside capability gains.