LangChain says LangSmith LLM Gateway can limit model access by key
LangChain describes a demo that permits one key to call Opus 5 only, then attempts to call Sonnet 5 with that same key.
TLDR
LangChain says organizations can use LangSmith LLM Gateway to restrict a key to permitted models, automatically blocking calls to any others. It describes testing that restriction by attempting a Sonnet 5 call with a key permitted to call only Opus 5. The company’s product page also advertises model fallbacks, spending caps and real-time cost monitoring for agents.
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