LLM Gateway vs Direct API: When Do You Actually Need a Gateway?

Calling an LLM API directly is trivial; operating a fleet of API calls is not. The gateway-vs-direct decision is really a question of when your app crosses from 'one integration' to 'a system of calls' that needs budgets, routing, and observability.

Here is the honest decision framework.

Go direct when...

• You ship a demo or a single, low-stakes feature.
• One provider, one model, and no budget pressure yet.
• You want zero additional infrastructure or concepts.
• Your team will graduate to a gateway in weeks anyway.

Use a gateway when...

1. You have multiple models, projects, or keys.
2. Surprise bills would hurt — you want hard budget limits.
3. You need per-project spend attribution.
4. You want routing, caching, retries, or failover without building them.
5. Non-engineers will run prompts — you need a workspace, not an SDK.

What a gateway costs you

A gateway adds one moving part, one more credential, and (with some providers) a per-token markup. With a BYOK gateway there is no markup and low ops cost, so the trade flips decisively toward the gateway once you are past a prototype.

FAQ