OpenAI answers TypeSafe's Jev with a Decision API built on Luna

OpenAI has introduced a new 'Decisions API' powered by its Luna model, designed to provide fast, predefined classification and routing responses. The move is seen as a competitive response to TypeSafe's Jev model, offering developers a more efficient alternative to standard chat-based LLMs.
Why it matters
This signals a shift in AI development toward specialized, high-speed decision-making models that prioritize accuracy and latency over conversational capabilities.
With the sudden rise of TypeSafe’s Jev , decision models have become incredibly popular, so it’s not surprising that OpenAI is also announcing its take on this model type at its annual DevDay conference on Tuesday.
The company’s new Decisions API is based on the company’s Luna model — the smallest and most affordable model in its current lineup.
The Decisions API is likely a reaction to TypeSafe and Jev, and OpenAI probably rushed the announcement ahead of its DevDay, so for now, this is all OpenAI is sharing about the Decisions API.
An OpenAI spokesperson tells The New Stack that the company plans to share more “at broad rollout.”
For now, the new API is available in limited preview, and the broad release is planned for the coming days.
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