OpenAI Launches Decisions API to Challenge Emerging Decision-Model Leader TypeSafe's Jev

OpenAI has made its Decisions API widely available, marking the company's formal entry into a rapidly expanding market for fast, bounded decision-making models that return typed answers with confidence scores instead of free-form text. The launch, following OpenAI's announcement at its developer conference on September 29, 2026, positions the company against TypeSafe AI's Jev, a decision model that achieved $7.6 billion in valuation within weeks of its own release in mid-September.