# Hacubu: SemIf decision model free for a week on LangSmith Gateway

Jacob Lee (@Hacubu) said they are serving SemIf, an open-source decision model, free for the next week as decision models become a first-class part of the LangSmith Gateway. He also said it is compatible with the TypeSafe SDK.

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Source: Jacob Lee · Published 9/21/2026, 09:12:38

Jacob Lee (@Hacubu) said **decision models are becoming a first-class part of the LangSmith Gateway**, and that they are serving **SemIf**, an open-source decision model, **free for the next week**. The post framed the news as free open-source Jev with LangSmith Gateway.

He said SemIf is compatible with the TypeSafe SDK and can be tried by changing a string, and pointed to documentation in a thread.

Tags: LangSmith Gateway, SemIf, Decision Models, TypeSafe SDK

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