Managed AI gateway comparison

Vercel AI Gateway alternative: KeepRouter, routing and costs

Compare KeepRouter and Vercel AI Gateway by supported models, provider options, BYOK budget behavior and concrete migration work, including AI SDK applications. [1] [2] [7] [8]

Last reviewed 2026-09-29 · Editorial review: KeepRouter Editorial

When is KeepRouter a useful Vercel AI Gateway alternative?

KeepRouter is worth testing when your application needs models in its catalog, public customer prices and a prepaid API account. Vercel AI Gateway is a stronger candidate when your code depends on AI SDK gateway options, provider selection or BYOK. You can use Vercel's Gateway API from an application that is not hosted on Vercel; hosting independence alone is not a reason to switch. This is KeepRouter's product comparison, not a neutral performance ranking.

Compare the capabilities that change application code

Requirement	KeepRouter	Vercel AI Gateway
Model access	Public KeepRouter IDs and supported routes in the live catalog	Gateway catalog and documented SDK or HTTP routes
Existing OpenAI client	Set KeepRouter base URL, key and supported model	Use the documented Gateway compatibility endpoint
Provider preferences	Customers select the model; no self-serve provider-order API	Gateway options include provider filtering, ordering and sorting
Bring provider credentials	No self-serve BYOK	BYOK available under the documented paid-tier terms
Cost comparison	Use current KeepRouter customer prices and recorded quantities	Vercel states provider list pricing with no token markup or token platform fee

See Vercel's getting-started guide, provider options and pricing. For KeepRouter, check the catalog and API reference. We have not run a controlled comparison establishing that either service is generally faster or cheaper.

Provider order is not the same as a provider restriction

Vercel documents order, only and sort under providerOptions.gateway. A preference and an allowed set answer different questions. If your application must use a particular set of providers, preserve that requirement during migration rather than deleting the field to make a request succeed.

For example, a chat assistant that only needs a supported model can be a straightforward KeepRouter trial. An assistant whose customer chooses the serving provider cannot keep that product feature through a base-URL change alone. It needs a different implementation or a gateway exposing the required control. Use Vercel versus OpenRouter for that routing-focused decision.

A BYOK budget detail worth checking

Vercel's BYOK guide, checked on 29 September 2026, states that spending through your own credentials does not count toward Gateway budgets. It also documents fallback to system credentials when a BYOK request fails; that fallback consumes Gateway credit. This means a Gateway budget is not a cap on the complete BYOK workflow.

If you use BYOK, reconcile provider-billed usage and Gateway-billed fallback separately. If moving to KeepRouter, compare the customer prices for the destination model and replace the old budget assumptions. The cost calculator can estimate a token workload, but it cannot infer your provider agreement or recreate Vercel budget settings.

A practical migration map

Existing code or setting	What to do before moving
AI SDK model object	Select an appropriate supported client adapter; keep the app's UI streaming format separate from raw API events
`providerOptions.gateway`	List each option's purpose; do not assume it transfers
Model ID	Look up the exact KeepRouter ID instead of stripping a provider prefix automatically
Streaming and tools	Test clean completion, cancellation, tool arguments and the tool-result continuation
Credit and provider billing	Set the new budget from KeepRouter customer rates; balances do not transfer

Start with credential-free JSON in the API migration checker. Download the Python and Node starter pack if you want a separate trial client. Its dry-run path does not send inference; use a scoped key and a small output limit for the real call. A basic free-model call checks setup, while the intended paid model needs its own functional test and sufficient credit.

Choose on a completed task

Run a fixed set of your actual task shapes through both paths. Count accepted results, all attempts, elapsed time and total charge. A Vercel integration using useful provider policy may be best left in place. A supported KeepRouter model can be a reasonable choice when that policy is unnecessary and its measured output and cost fit your application. The gateway evaluation worksheet supplies a filled example of that decision.

Frequently asked questions

Does Vercel AI Gateway require the AI SDK?

No. Vercel also documents OpenAI Chat Completions, OpenAI Responses, Anthropic Messages, and OpenResponses interfaces. Check the exact model and operation before choosing a client.

Can I use my own provider keys with Vercel AI Gateway?

Yes. BYOK credentials are team-scoped. Vercel also documents retry through system credentials when a BYOK attempt fails, so strict routes should configure and test that behavior.

How does Vercel AI Gateway choose a provider?

Applications can set provider order and provider-only rules or use automatic selection. Vercel says automatic selection considers recent uptime and latency among eligible providers.

Is KeepRouter or Vercel AI Gateway cheaper?

There is no universal answer. Compare current prices for the exact model and provider path, then run the application's request mix with the intended routing and billing settings.

Can migration be only a base URL change?

A simple text call may be close, but provider rules, model IDs, tools, streaming, errors, usage, BYOK, and budgets need explicit mapping and tests.

Do Vercel Gateway budgets cap BYOK spending?

Vercel’s BYOK documentation states that own-key spending is excluded from Gateway budgets. System-credential fallback is billed to Gateway credit; account for both paths.

Sources reviewed

Sources last reviewed 2026-08-15