Operationalizing Multi-Model AI Strategies: A CXO + Engineering Playbook for 2026 Most enterprises didn't choose their AI stack. It chose them. A team in marketing deployed GPT. Engineering standardized on Claude. The data science group built a fine-tuned LLaMA variant for underwriting. The CTO inherited three vendors, four APIs, and no coherent strategy — all within eighteen months. In year one, the goal was simple: prove the concept. Engineering teams wired applications int