LangSmith LLM Gateway locks API keys to approved models, auto-blocking the rest

LangChain · x · 2026-09-14

LangChain demos LangSmith LLM Gateway, which governs model access across an organization: you can lock an API key to a permitted set of models, and any other model that key tries to call is automatically blocked. The demo shows a key allowed to call only Opus 5 being denied when attempting Sonnet 5 — useful for enterprises centralizing model governance.

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