Build an LLM gateway when the gateway itself creates strategic advantage, must run in an environment no vendor can support, or needs a unique data path. Buy when the goal is reliable model access, routing, metering, and policy without owning a permanent provider-integration product.
The INFRO view: INFRO is the buy option for teams that want one multi-model control plane without turning provider plumbing into an internal product.
Why the prototype is misleading
Forwarding one JSON request to two providers is easy. Production depth includes streaming translation, tool calls, structured output, cancellations, media jobs, authentication, rate limits, retries, circuit breakers, price changes, usage reconciliation, roles, budgets, and incident response.
Estimate the complete operating surface, not the first proxy. Every new provider and capability increases the compatibility matrix.
When building is rational
Build if inference routing is part of your product's unique advantage, if workloads must remain fully inside a controlled network, or if you need a specialized scheduling or hardware integration no external gateway offers.
Assign a durable owner and budget. Internal infrastructure without an owner becomes an invisible dependency that fails during provider incidents and audit requests.
When buying is rational
Buy when model access is necessary but undifferentiated, the team is small, time to market matters, provider changes are frequent, or finance and security need a shared control boundary.
A standard client contract and exportable data reduce buyer risk. The gateway should remove vendor lock-in, not replace it with a proprietary application interface.
Run a total-cost comparison
Model engineering, on-call, provider certification, billing reconciliation, security review, feature lag, and opportunity cost. Compare those with platform pricing, data-path risk, control fit, latency overhead, and exit cost.
Use a proof of concept with real tool calls, streams, and failures. Happy-path benchmarks hide most of the ownership cost.
Where INFRO fits
INFRO provides an OpenAI-compatible text surface, documented media lifecycles, model access, health-aware routing, failover, request traces, usage accounting, and spend controls. The public docs and policies create a reviewable exit and procurement path.
Compare INFRO against your requirements using the documentation, pricing, security posture, and early-access process. If INFRO cannot meet a hard data-path or deployment requirement, building may be the correct answer.
Frequently asked questions
How long does it take to build an LLM gateway?
A basic proxy can take days; a production gateway is an ongoing program because provider protocols, prices, capabilities, and failure modes keep changing.
When should I build instead of use INFRO?
Build when gateway behavior is strategic, the workload must remain in an unsupported environment, or a unique hardware or scheduling requirement cannot be met externally.
How do I avoid gateway lock-in?
Prefer a standard client protocol, configuration-driven model IDs, exportable request data, and a documented path back to direct providers.
