LangChain docs detail calling SemIf decision models via LangSmith Gateway System One API
Hacubu · x · 2026-09-21
LangChain engineer Hacubu published full documentation for using decision models through the LangSmith Gateway: the hosted SemIf (semif-qwen3.5-4b) or Jev via BYOK. Decision models use the System One API (/v1/systemone endpoint) — they accept state and named questions and return structured answers per question, for classification and rubric scoring.
- SemIf is free until September 28, 2026; requires a paid non-Enterprise plan and a workspace-scoped API key with gateway:invoke permission
- TypeSafe SDKs point baseurl to gateway.smith.langchain.com without /v1
- Docs include Python, JavaScript and cURL examples
Related event: LangChain Launches Decision Models with Open-Source SemIf Free for a Week(7 posts)→
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