Conclusion
- Direct APIs are cheaper and simpler for early prototypes.
- Gateways become valuable when operational cost, retries, and provider outages matter more than the smallest markup.
- The safest architecture keeps direct-provider escape hatches while routing production traffic through one observable endpoint.
What to do next
- Start direct if you only call one provider and can tolerate manual incident response.
- Add structured logs for prompt, model, latency, status, and estimated cost before adding more providers.
- Introduce gateway routing when you need fallback, per-customer budgets, or multi-model experiments.
- Keep provider-specific tests so a gateway outage does not trap your application.
- Review the route table monthly because prices, context windows, and model quality change quickly.
Recommended paths
| Provider | Free / credits | Best for |
|---|---|---|
| Direct provider API | Provider-specific credits | Simple apps and lowest integration overhead |
| OpenRouter-style gateway | Varies | Many model families through one endpoint |
| OpenLLMAPI | Trial terms vary | Owned routing CTA with logs and fallback |
| Self-built proxy | Infrastructure cost only | Teams with strict control and engineering capacity |
Global developer checklist
- Confirm whether signup, billing, and API keys work from your country before writing production code.
- Prefer OpenAI-compatible endpoints when you may need to switch models, regions, or providers later.
- Test free credits with a real smoke prompt and record latency, error shape, streaming behavior, and quota burn.
- Keep at least one fallback route for provider outages, model deprecations, and regional access changes.
Production handoff
Add routing without rewriting your app
Keep your OpenAI-compatible client and add fallback, route logs, and budget attribution behind one endpoint.
FAQ
Is an LLM gateway always more expensive?
Not necessarily. A markup can be cheaper than engineering your own fallback, logging, and cost attribution if production failures are costly.
When should I avoid a gateway?
Avoid it when one provider is enough, compliance requires direct contracts only, or you cannot accept another dependency in the request path.
What should every gateway log?
Model, route, latency, token estimate, status code, retry count, user or agent id, and final cost bucket.