SemIf offered free for a week through LangSmith Gateway on September 21, 2026
The announcement describes SemIf as an open-source alternative to jev, which it calls a “decision model,” and says SemIf is based on Qwen3.5.
TLDR
A September 21, 2026 announcement offered SemIf free through LangSmith Gateway for the following week, describing it as open source and based on Qwen3.5. A user sharing the announcement said typed outputs and probabilities looked like a cleaner way to route agents than parsing LLM text each time.
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