For two and a half years, one assumption held across enterprise AI. Anthropic owns the serious coding money. This week it broke in three separate places at once. Databricks rolled out GPT-6 Astra to all 3,500 of its engineers after a 200-user pilot benchmarked it against Opus 5. Astra won on the complex work, system design and long-horizon tasks, and coding spend jumped 60%. That's the first detailed public case study of a top engineering org picking OpenAI at the frontier. The market data…