Show HN: Jevper – the Jev interface on top of any OpenAI-compatible model
Jevper is a new open-source interface that allows developers to use the Jev structured output format with any OpenAI-compatible LLM. It functions independently of TypeSafe AI and supports various backends like llama.cpp.
Why it matters
It provides developers with more flexibility and vendor-neutral options for implementing structured data extraction from large language models.
The Jev interface — state in, typed questions ( noul , choice , score ) out, answers carrying probabilities and confidence — on top of any OpenAI-compatible model.
Same call as typesafe-sdk , different backend: point jevper at a hosted LLM or a self-hosted llama.cpp server and code written for Jev keeps working, unchanged.
It does not call the hosted TypeSafe API and does not depend on typesafe-sdk or openai at runtime — the client object is duck-typed. Any object exposing responses.create or chat.completions.create works, including a self-hosted llama.cpp server.
jevper is an independent implementation of the documented System One wire format. It is not affiliated with, endorsed by, or supported by TypeSafe AI — questions about the API itself belong in their docs .
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