OpenAI's decision to cut off Cursor, an AI-powered code editor, has exposed a critical new phase in enterprise AI competition where vendor lock-in and platform control are becoming central battlegrounds. The move highlights how companies can no longer depend on single-provider solutions as competitive pressure mounts and AI vendors tighten their ecosystems. Enterprise buyers now face a choice between consolidation and diversification. According to industry analysis, enterprises need to adopt multi-layered strategies to maintain flexibility and reduce vendor dependence. These strategies include deploying open-weight models alongside proprietary solutions, implementing model routing that can seamlessly switch between providers, and building internally controlled harnesses that abstract away vendor-specific APIs. Such approaches give companies negotiating leverage and insulate them from sudden access restrictions. The broader competitive landscape is also shifting as geopolitical and regulatory factors reshape the industry. Anthropic's Pentagon contract win signals how government and enterprise buyers are now actively seeking alternative vendors to OpenAI. Meanwhile, AI chip restrictions and data center politics are creating new constraints on where and how models can be deployed. Simultaneously, cheaper OpenAI models and the emergence of enterprise Mac Minis as deployment targets are democratizing AI infrastructure, forcing all vendors to compete more aggressively on both capability and cost.