OpenAI landed on Amazon's cloud, and eighteen months of Microsoft exclusivity ended in a single announcement.
On April 28 the same frontier models became reachable from any major cloud. Access stopped being a moat that day.
On April 28, 2026, Amazon Web Services put OpenAI's newest models, GPT-5.5 and GPT-5.4, along with its Codex coding system, onto Amazon Bedrock, its enterprise model service. The line from AWS was blunt: customers had been asking for this for a very long time. What the move actually did was close the book on the arrangement that had shaped enterprise AI buying since late 2024. For roughly eighteen months, a company that wanted OpenAI went through Microsoft Azure. That door was the only door. It is now one of several. GeekWire noted the models arrived one day after the Microsoft exclusivity lapsed.
Read the tape from the same two weeks and the pattern is loud. Microsoft reported that its AI business had crossed 37 billion dollars in annual recurring revenue, up 123 percent from a year earlier. Google Cloud passed 20 billion dollars in a single quarter at 63 percent growth, with Sundar Pichai telling analysts the number would have been higher if the company had the compute to meet demand. Anthropic disclosed a 30 billion dollar annualized revenue run rate. Underneath every one of those figures sits the same fact: AI revenue is real, it is large, and no single vendor controls the door to it.
When several clouds sell the same frontier models at the same published prices, model access stops being something a buyer pays a premium for. It becomes plumbing. The exclusivity era produced one obvious winner and one obvious sales motion: choose the platform, then reach the model behind it. The multi-vendor era erases that motion. Anthropic has been on Bedrock for years, Google runs its own stack, and OpenAI is now reachable almost everywhere. The competitive question moves up a level, from which cloud gets you to the model to what you actually build once you are there.
The repricing is quiet but total. A scarce, premium point of access became a commodity in one product announcement. The firms whose entire strategy assumed that scarcity are the ones now exposed, and the exposure will not show up as a headline. It will show up as a slow erosion of the premium they used to command for standing next to a model the buyer can now reach alone.