Enterprise adoption of AI is no longer driven by novelty or isolated performance gains, but by how reliably a system can be governed, audited, and scaled across teams without creating hidden operational or compliance risks that only emerge after months of real use. Google Gemini 3, OpenAI ChatGPT 5.2, and Anthropic Claude Opus 4.5 represent three mature but structurally different enterprise strategies, each optimizing for a different balance between control, flexibility, and