Managed AI gateway comparison

KeepRouter vs Vercel AI Gateway: focused model access or Vercel routing

Choose KeepRouter for a focused managed model catalog and API. Choose Vercel AI Gateway when Vercel or the AI SDK is already part of the application, or when BYOK, provider ordering, automatic provider selection, and gateway budgets are required. Both are hosted services, but their routing controls and ecosystem responsibilities differ. [1] [2] [7] [8]

Last reviewed 2026-08-15 · Editorial review: KeepRouter Editorial

Short answer

Choose KeepRouter when you want a focused managed API and live model catalog without making a broader application platform central to the integration. Choose Vercel AI Gateway when your application already uses Vercel or the AI SDK, or when BYOK, explicit provider ordering, automatic provider selection, and gateway-level budgets are requirements. Both products offer hosted multi-model access, but they expose different routing controls and ecosystem integrations. Verify the exact model, API, provider path, and billing method you plan to use before migrating. A shared OpenAI-shaped request alone does not prove that the two production paths behave the same way.

Decision table

Decision factor	KeepRouter	Vercel AI Gateway
Primary focus	Managed model access through a focused API and live catalog	Managed inference gateway integrated with Vercel and the AI SDK
Operating model	Hosted service with KeepRouter credentials and prepaid usage	Hosted service with Gateway credits, Vercel authentication, and optional BYOK
API surface	Use the route documented for the selected KeepRouter model	AI SDK, OpenAI Chat Completions, OpenAI Responses, Anthropic Messages, and OpenResponses
Provider routing	Upstream provider choice is operator-managed and private	Automatic selection, provider order, provider-only rules, and fallbacks
Model discovery	Public KeepRouter IDs, routes, modality, and current customer price units	Vercel model pages and API expose available models and provider options
Best starting point	Teams prioritizing a compact model-access workflow	Vercel and AI SDK users who want configurable provider routing

What Vercel AI Gateway provides

Vercel AI Gateway presents models from several providers behind managed API surfaces. Applications can use the AI SDK or supported OpenAI and Anthropic protocols. Routing controls can specify a provider order, restrict a request to selected providers, or let the gateway choose automatically. Vercel says its automatic choice uses recent provider uptime and latency as inputs. Fallback behavior can move a request to another eligible provider.

The official pricing documentation says gateway inference follows provider list prices without an extra token markup. This is Vercel's current commercial statement, not proof that every complete workload costs less. Model availability, modality support, provider coverage, and surrounding plan capabilities vary by catalog entry and account plan.

BYOK lets a Vercel team attach provider credentials. Those credentials are team-scoped. Vercel also documents that an unsuccessful BYOK attempt can retry through system credentials. A team with strict provider, residency, or billing requirements should constrain and test that behavior instead of assuming that attaching a key fixes the serving path for every request.

When KeepRouter fits

KeepRouter is a clearer choice when the decision is mainly about obtaining managed access to a model through a focused catalog and API. The team can select an exact public ID from the live catalog, use the route shown for that model, and keep existing application hosting and SDK choices. The customer does not need to define provider order or bring upstream credentials.

KeepRouter is not suitable when the application must expose provider selection to its own users, enforce a request-level provider order, or bring provider keys under a Vercel team. Its public contract does not claim those Vercel controls. It also does not claim that every AI SDK provider option will pass through unchanged.

When Vercel AI Gateway fits

Vercel AI Gateway is a natural candidate for applications built with the AI SDK or operated in a Vercel team. It is also relevant when the application needs to choose provider order, restrict eligible providers, use BYOK, monitor gateway budgets, or use one of Vercel's documented compatibility protocols.

It is a weaker match when self-hosting is mandatory. It also requires care when the application depends on provider-native behavior that the chosen gateway protocol does not represent. Provider options can be useful, but each option becomes a policy that needs tests, ownership, and a rollback rule.

Move from Vercel AI Gateway to KeepRouter

Inventory every Vercel endpoint, AI SDK method, model ID, provider rule, BYOK credential, fallback, and budget used in production.
Map each required workload to the current KeepRouter catalog. Do not rely on a static model count or assume similar names identify the same revision.
Select the exact KeepRouter route for chat, Responses, Messages, embeddings, or another documented operation. Compare request and response fields.
Decide how provider ordering, automatic selection, and fallback will be replaced. Keep application-level policy where KeepRouter does not expose an equivalent control.
Rotate credentials through the normal secret process and confirm that KeepRouter's prepaid ledger becomes the customer billing source.
Replay bounded tests for streaming, tools, structured output, errors, usage, and any model-specific capability the application uses.
Recreate budget alerts, usage reporting, and dashboards before moving full traffic. Keep a rollback path until production behavior is observed.

Move from KeepRouter to Vercel AI Gateway

Choose the AI SDK, OpenAI-compatible, Anthropic Messages, OpenResponses, or another documented Vercel interface.
Map existing model requirements against the live Vercel model and provider directory.
Choose Gateway credits or BYOK. If using BYOK, review the documented retry through system credentials and decide whether to permit it.
Configure provider order, provider-only restrictions, and automatic routing deliberately. Defaults are still production policy.
Recreate budgets, monitoring, and alert ownership in Vercel. KeepRouter balances and private upstream mappings do not transfer.
Test request fields, streaming, errors, tools, and provider-specific behavior with scoped traffic before cutover.

Capability boundary

A shared protocol does not guarantee identical model behavior. Tool definitions, structured responses, multimodal inputs, error formats, reasoning controls, and provider-specific parameters can differ by model and route. Vercel plan tiers can also affect capabilities around the gateway. KeepRouter support remains limited to what its model pages and OpenAPI document publish.

This page does not establish which service is faster, cheaper, or more reliable. Such a conclusion needs a fixed model, provider, region, request set, routing policy, and measurement period. Use the AI gateway evaluation guide for that test, or start with best AI gateways and managed versus self-hosted gateways to confirm the product category first.

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.

Sources reviewed

Sources last reviewed 2026-08-15