Shift Log: Relay Cutover Practices to Keep This Year

The migration ticket often looks small: replace a vendor key, change the API address, and restart the client. The operational change is larger. Requests now pass through another service, and that changes where authentication, routing, billing, and failures need investigation. The practices worth keeping this year make those boundaries visible before production traffic moves.

A relay can be useful when several applications or coding tools need access to different model families through one service. Relay365 is a pay-as-you-go relay desk covering Claude, GPT, Gemini, DeepSeek, Kimi, GLM, Qwen, Grok, and more. That breadth can simplify access, provided the migration preserves control over credentials, request behavior, and spending.

Record the direct connection before changing the route

Capture the current configuration while it still works. Record the endpoint, model identifier, SDK version, timeout, retry policy, and any features the application depends on. Keep secrets out of this record. Include a few representative requests and their expected behavior so the new route has a useful comparison point.

Choose examples that expose application requirements. A short text response proves basic connectivity; it says little about streaming, tool calls, structured output, or image input. If the application uses those features, include them in the cutover checks. For example, a workflow using Gemini 2.5 Flash should be tested with its actual payload shape and the relay's documented model identifier.

Keep the relay address and credentials explicit

Relay365 works with Claude Code, Codex, Gemini CLI, and OpenAI SDK clients. Its API base is https://api.api365relay.com; OpenAI clients add /v1. Configure the address using the mechanism supported by each tool, and check whether that tool expects a service root or a versioned base. An extra or missing path segment can make a valid credential appear broken.

Store relay credentials in your existing secret manager or approved local credential mechanism. Use separate credentials for development and production where supported, and keep them out of source control, shell history, and diagnostic output. Preserve the direct vendor credential securely during the migration window if it is part of the rollback plan.

Confirm which settings each client actually reads. A shell environment variable, project configuration, and user configuration can compete for precedence. Verify the effective destination through available client diagnostics or service records without printing authorization headers.

Test the behaviors that compatibility claims cannot settle

SDK compatibility is a useful starting point. Applications still need checks against the exact operations they use. Run a small, representative workload through the relay and inspect the results before increasing traffic.

• Verify that streaming responses arrive incrementally and that interrupted streams leave the application in a recoverable state.
• Check that tool arguments and structured responses satisfy the application's validation rules.
• Exercise authentication failures, unavailable models, timeouts, and rate limits to confirm that errors reach the right handling path.
• Review retries across both the SDK and application so one failed operation does not trigger an unexpected burst of requests.

Record any differences that affect users. Avoid relying on a single successful prompt or an exact wording match: model output can vary, while application requirements such as valid fields and successful tool execution are concrete.

Move traffic with a spending boundary and a return path

Start with one development workflow or a small production slice if your architecture supports it. Define acceptable behavior before the move: required response validity, tolerable latency, and an operational spending boundary. Compare equivalent workloads, since request counts alone can hide differences in input length, output length, and model choice.

Keep route selection configurable so an authorized operator can restore the direct connection without editing application logic. Test that return path, including credentials and model settings. Capture timestamps, model identifiers, available request IDs, latency, and errors for investigation, while excluding sensitive prompt content unless collection is necessary and approved.

Relay365 fits teams that want pay-as-you-go access to multiple model families across their coding tools and applications. Create a Relay365 account, then validate one bounded workflow before expanding usage. Keep the migration record with the service configuration so the next shift can see which route is active, what was tested, and when to roll back.