AI gateway vendor exit plan: prove you can migrate keys, routes and logs

Most gateway adoption guides begin with a simple endpoint swap. Cloudflare's OpenAI provider documentation, LiteLLM's proxy quickstart and OpenRouter's compatible API examples all show how familiar SDKs can point at different base URLs. That makes an initial chat integration convenient. It does not prove that provider-specific request parameters, structured output, tool behavior, audio routes, file handling, retry semantics or usage reporting will survive a move unchanged.

Map each dependency to its owner. The application owns prompts and business logic; the gateway may own virtual keys, model aliases, tenant policy, fallbacks, request metadata and observability. The provider owns model endpoints, usage invoices and provider-level keys. A buyer should know which configuration can be exported in a documented format, which must be recreated manually and which may not be recoverable after cancellation.

An application might request a friendly name such as 'support-fast' while the gateway resolves it to a particular provider, model snapshot and region. LiteLLM documents model aliases and routing groups configured in its model list. OpenRouter uses provider/model identifiers and documents compatible API access. These are useful conventions but not interchangeable schemas. Record both the public alias and the actual provider/model mapping, plus fallback order and version pins.

Build a table of every alias with its owning application, effective model, required capabilities, region restriction and tested alternative. A replacement gateway should reject an unsupported alias rather than silently pick a different model. Compare tool-call schema, streaming, safety settings, output quality and price on a fixed synthetic fixture before changing production. A successful text completion alone is not a portability test for an agent using structured tools.

Virtual keys are generally gateway-scoped credentials; copying them into a new system may be impossible or unsafe. LiteLLM documents generation and management of virtual keys, and its management CLI includes operations for listing and deleting keys. Plan to issue new scoped credentials for the destination gateway, rotate application configuration through a secure secrets manager and retire the old keys only after traffic is proven to have moved.

Bring-your-own-key does not mean there is no custody question. Determine whether the gateway stores provider credentials, forwards them per request or uses another delegated mechanism. During exit, verify the old gateway no longer has access to provider credentials it should not retain, while preserving any evidence required for an incident investigation. Do not print keys into migration logs, commit them to a repository or assume that deleting a UI record proves provider-side revocation.

A new gateway may offer a similar feature name but different enforcement semantics. A 'spend cap' could be estimated from request tokens, checked before admission or enforced after a completed request. A 'fallback' could retry automatically, return an error or select a model outside an approved region. Copy the business rule, not merely the UI setting. Re-run the tests from the existing enterprise RFP and spend-limit guides with two tenants and concurrent traffic.

Telemetry portability also matters. Cloudflare documents analytics, metadata tagging and OpenTelemetry export; LiteLLM documents spend logs and their export behavior. Before cancellation, confirm how to retrieve audit records, how timestamps and request IDs map across systems and whether a destination can ingest the export. Sensitive payload retention and deletion rules may differ from metadata retention. Verify contractual retention terms and actual configuration rather than assuming 'exportable' means complete.

Choose a non-sensitive workload with a fixed set of requests and an agreed success metric. Route the same fixture set through the incumbent and candidate gateway, keeping the upstream model and provider account constant where possible. Compare outputs, request attempts, latency percentiles, cost attribution, error propagation and policy enforcement. Avoid sending the same real customer action twice; replay only synthetic or read-only tasks.

Then move a small test application to the destination endpoint with new credentials. Induce an upstream 429 and a gateway outage to observe rollback. A sound plan has an owner, a cutover window, a traffic-switch mechanism, a maximum rollback time and evidence of successful rollback. Do not decommission the old gateway before the new path is healthy and audit exports are confirmed. If the vendor cannot support a safe exit, price that lock-in into the procurement decision.

Ask every candidate, whether managed or self-hosted, what happens when the subscription ends, how quickly access is removed, how long logs remain, which configuration can be exported and what migration assistance is contractually included. Self-hosted software may reduce dependence on a managed control plane, but it still creates dependencies on its configuration schema, database, plugins and operational expertise. Managed gateways may simplify operations while increasing reliance on vendor APIs.

For AetherGate or any alternative, require a demonstration rather than assuming that a compatible SDK implies a reversible deployment. Use the existing gateway pricing and enterprise RFP guides as hubs; this article covers the narrow, often neglected exit exercise. A reversible proof of concept is a stronger buying signal than a large model catalog or an unsupported guarantee of effortless migration.