Odyssey, an AI world-model startup, led a slower week of major funding rounds with a $310 million（約500億円） Series B, as venture investors continue backing AI infrastructure and specialty AI models across biotech, quantum computing, and cybersecurity.

What happened: Odyssey, a Menlo Park-based developer of AI world models that create multimodal simulations of real-world environments, raised $310 million（約500億円） in a Series B led by Natural Capital, with backing from Amazon, AMD Ventures, EQT, Google Ventures, IQT, and SignalRank at a $1.45 billion（約2300億円） valuation. The week also saw $100 million（約160億円） seed and Series rounds go to cybersecurity startup Ent.AI (which emerged from stealth), quantum-computing company Atom Computing (which also received a $100 million（約160億円） Letter of Intent from the U.S. Department of Commerce), and AI infrastructure platform Hydra Host, among other deals across fintech, biotech, and defense sectors.

Why it matters: Venture investors are placing large bets on AI infrastructure and specialized AI applications even in weeks with slower megadeal activity. Odyssey's funding suggests investor confidence in world models—a category of AI that simulates real-world environments—as a viable business direction. The parallel surge in cybersecurity AI and government-backed defense AI (Twenty Technologies raised $100 million（約160億円） for AI-enabled cyber warfare systems) indicates capital is flowing toward both commercial and national-security applications of AI technology.

What to watch: Atom Computing's dual public-private backing—a $100 million（約160億円） Series C round plus a $100 million（約160億円） Letter of Intent from the U.S. Department of Commerce—signals growing government engagement in quantum-computing commercialization. The startup has now raised just over $191 million（約310億円） in private investment to date, per Crunchbase.