Microsoft has put OpenAI’s GPT-5.5 into Microsoft Foundry, signaling another major step in the company’s effort to turn frontier models into enterprise systems that can actually be deployed, governed, and scaled. The announcement, published on April 23, 2026, frames GPT-5.5 as a model built for professional and high-stakes workflows, with Microsoft emphasizing long-context reasoning, improved agentic execution, better computer-use accuracy, and stronger token efficiency. Just as important...