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A single API key can give an application one place to send requests while a gateway routes them to multiple LLM providers. It does not remove the need for upstream provider credentials, decide which model your application should request, or guarantee that you can see why a route or fallback occurred. Those are separate design choices.
What a single-key LLM setup actually changes
A gateway sits between your application and model providers. Your application sends a request to the gateway’s endpoint using a gateway credential; the gateway applies routing rules and calls an upstream provider using credentials configured for that provider. The app may have one key to manage, but the system still has distinct credentials, routing policy, and upstream services.
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For example, LiteLLM documents a common interface for multiple providers and a self-hosted gateway with virtual keys. Its client setup describes two authentication hops: the client authenticates to the gateway, then the gateway uses configured provider credentials for the upstream request. OpenRouter documents a hosted, OpenAI-compatible endpoint at https://openrouter.ai/api/v1 and one API key for access to multiple providers and models. These are different operating models, not proof that a single key removes provider accounts or their credentials.
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- Requested model: the model name your application asks for.
- Serving provider: the provider that handles that model request, which may be selected by the gateway or constrained by your policy.
- Failure response: whether the request is retried, sent to another provider for the same model, or redirected to a different model.
OpenRouter’s routing documentation makes the first two distinctions explicit: the caller sets the model, and the service selects a provider unless the caller overrides the policy. Treating model choice and provider choice as one setting makes it harder to understand what happened when a request takes an unexpected path.
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What “fallback” means—and why the distinction matters
Fallback is not one behavior. It can preserve the requested model while changing the provider, or it can change the model itself. Record which kind your policy allows because the second can change response characteristics and price.
| Recovery layer | What changes | What to inspect |
|---|---|---|
| Provider-level failover | The gateway tries another provider for the same model. | The selected provider and whether the requested model stayed the same. |
| Model-level fallback | The gateway tries a different model from an ordered list. | The requested model, the final model in the response, and the price for the model actually used. |
OpenRouter documents both layers. Its model fallback guide lists rate limits, downtime, context-length validation errors, and moderation flags among conditions that can trigger a fallback. The guide says the response’s model attribute identifies the model ultimately used and that requests are priced using that model. Do not infer the final model from the model name your application sent.
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What observable candidate scoring looks like
Candidate scoring is implementation-specific; there is no shared scoring standard established by these product documents. A useful system should let an operator distinguish the candidates considered, the candidate selected, and the reason for the choice from the behavior after a request fails.
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LLM Gateway documents request logs that show providers considered, the selected provider, a selection reason, and score dimensions including uptime, throughput, latency, price, priority, and cache support. It documents a hard switch away from a preferred provider when uptime falls below 85%, and a soft switch when a competing score exceeds the preferred score by more than 0.15. Those are this service’s documented rules; they are not general gateway defaults or independently comparable performance results.
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LLM Gateway also says requests are normally scored independently and describes sticky session routing that can pin a multi-turn session to a provider and region. A session pin can avoid switching providers between turns; whether that suits an application depends on its continuity needs and provider-side behavior, including prompt caching.
Routing visibility without a score breakdown
LiteLLM documents routing strategies across configured deployments, including latency-based routing and cooldown behavior. A cooldown applies to an individual deployment, so a healthy alternative in the same model group can remain eligible. LiteLLM also documents a response header that identifies the deployment serving a request. That is useful operational evidence, but a deployment identifier is not the same thing as a per-candidate score explanation.
How the documented approaches differ
| Approach | Operation and credentials | Routing and fallback controls | What is observable in the cited documentation |
|---|---|---|---|
| OpenRouter | Hosted endpoint; one API key for access to multiple providers and models. The location and handling of upstream provider credentials are not stated in the cited routing material. | Provider routing is separate from the requested model; provider controls and fallback layers are documented. | The model ultimately used is available in the response’s model attribute. Per-candidate scores and selection reasons are not stated in the cited material. |
| LiteLLM | Can be used as a library or as a self-hosted gateway. In the documented proxy setup, the client uses a virtual key or sign-in token and the gateway uses configured upstream provider credentials. | Router strategies include latency-based routing, cooldown behavior, retries, fallback, and load balancing across configured deployments. | The documented response header identifies the serving deployment. A score breakdown like the one described by LLM Gateway is not stated in the cited material. |
| LLM Gateway | Operating and credential-custody details are not stated in the cited scoring material. | Provider selection, preferred-provider thresholds, and sticky session routing are documented. | Request logs show considered providers, the selection reason, and score dimensions including uptime, throughput, latency, price, priority, and cache support. |
These documentation descriptions do not establish which option is fastest, cheapest, or most reliable for a particular workload. Nor do the cited materials establish comparable data-retention, regional-processing, or compliance guarantees. Check the current terms and deployment settings for the service and configuration you intend to use.
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What to log so a fallback is explainable
A gateway’s own visibility is only part of the record. Keep enough application-side information to reconstruct what was requested, what actually served the request, and whether recovery changed the route or model. A practical per-request record can include:
- A request or trace ID and timestamp.
- The model requested by the application.
- The provider and deployment that served the request, when exposed.
- The final model reported in the response, especially when model fallback is allowed.
- The gateway’s selection reason and candidate scores, if the chosen gateway exposes them.
- Whether a retry or fallback occurred, which recovery layer it used, and the outcome.
- Latency, error category, and spend associated with the request, using the gateway’s or provider’s available data.
These are recommended audit fields, not a claim that every gateway exposes all of them. Do not put API keys or other secrets in logs. With LiteLLM, its documented deployment-identifying response header can help identify the serving deployment; with OpenRouter, inspect the response’s final model when model-level fallback is enabled. For a score-based policy, preserve the selection reason and score details where the service makes them available.
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How to choose a routing policy for an application
- Decide whether model identity may change. If it must not, allow provider-level failover only and verify that the gateway policy preserves the model. If a different model is acceptable, define an explicit ordered model fallback list and account for the changed output and price.
- Set candidate boundaries. Specify permitted providers, any provider order or preference, and whether the policy permits cross-provider routing. OpenRouter documents provider controls; configure the policy deliberately rather than assuming a gateway will choose candidates the way you expect.
- Choose where routing operates. A hosted gateway reduces the need to operate the routing layer yourself; a self-hosted gateway gives your team responsibility for deployment, configuration, and its credentials. For any option, establish who can access gateway and upstream keys.
- Choose per-request or session routing. Independent selection can let each request use current routing conditions. A sticky session can keep multi-turn requests on one provider and region, but may constrain routing choices. Select based on the behavior your application needs.
- Test failure paths, not just successful calls. Exercise provider errors and the fallback conditions relevant to your application. Verify whether a retry changes provider, model, or neither; inspect the response and logs; and confirm the resulting charge against the model actually used.
- Compare using your workload. Measure success rate, latency, spend, and output behavior under the intended candidate policy. Product documentation does not provide a shared independent benchmark that can settle those trade-offs for your traffic.
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