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Budget guardrails, runaway agent patterns, and what other tools don't tell you.
Both platforms let enterprise teams run frontier models inside their cloud perimeter. The pricing models, compliance posture, and vendor lock-in implications look different under scrutiny.
LangSmith is the right tool for LangChain teams and fast production tracing. Braintrust is the right tool for everything else. Here is exactly where the line is.
Four tools, four different bets on what the gateway layer should do. Here is a full side-by-side of architecture, pricing, enforcement capabilities, and who each one is actually built for.
OpenMeter went enterprise after Kong acquired it. Stripe LLM billing is still rolling out. For SaaS companies that need to meter each customer's AI usage, there's almost nothing self-serve.