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A successful OpenRouter call is not proof that BYOK worked; reconcile the route and upstream account usage.
When OpenRouter BYOK does not work, identify which provider should execute the request and whether your credentials apply to that exact product. A key for a similar cloud service, another location or an unsupported model can fail even when an ordinary OpenRouter request succeeds. Start with one provider-model pair.
Isolate the intended route
Record the model identifier, provider identifier and BYOK integration you expect to use. Remove unnecessary backup targets for the controlled test where permitted, so a success through another source cannot hide the original failure. Keep the required features and data conditions explicit.
Check the saved credential configuration without exposing the secret. An application may use a different account or environment from the one shown in your administrative session. Preserve the current configuration before changing several routing fields together.
Verify upstream access independently
Use an authorized small control request through the provider’s supported route if appropriate for your setup. Check product-specific permission, quota, account status and region. A working credential for one service does not imply permission for every product carrying the same provider name.
Compare the same intended model and feature requirement. A successful basic text call does not establish structured output or tools through the BYOK route. Save safe status fields and identifiers so the direct control can be correlated with the gateway attempt without copying private prompts.
Read fallback behavior explicitly
| Observation | Next check |
|---|---|
| Direct upstream request also fails | Permissions, quota, credentials and exact product |
| Direct request works but BYOK fails | Saved integration and routing identifiers |
| OpenRouter answers without expected upstream usage | Whether shared capacity handled the request |
| Only one location fails | Region applicability and resource access |
Provider preference, allowed targets and credential source are related but separate choices. Do not infer your account was charged merely because the response names the expected provider. Reconcile available usage records and the actual route after the controlled request.
Confirm the correction and its limits
Repeat one short request with the corrected configuration, then test the intended failure condition where safe. This establishes whether fallback is deliberately enabled or whether BYOK-only behavior is required. Record limits and the total task deadline so retries do not obscure repeated upstream refusals.
Keep the final provider, model, region and credential source in the launch recipe. For a GPU owner or operations funder, this separates a routing integration from a hardware capability test. Neither BYOK configuration nor API success implies global availability, approved partnership or demand for additional capacity.
Official references: openrouter.ai — byok, openrouter.ai — provider selection.
Related guides: OpenRouter BYOK pricing: separating the parts of the bill, OpenRouter error 401: checking credentials and the runtime.