Overview

Bifrost puts more than 20 AI providers behind a single OpenAI-compatible API, reducing the need to manage separate connections across applications. It also works with MCP tool servers as both a client and server, including exposing tools to clients such as Claude Desktop. That combination makes it relevant to teams coordinating tool use alongside model traffic, not just routing LLM calls.

Weighted load balancing, retries, provider failover, and semantic caching address reliability and repeated requests. Virtual keys let teams set permissions, budgets, rate limits, and routing by consumer. These controls matter when multiple applications or users share a gateway, but the product is an operational layer rather than a hosted model catalog.

Key features

Provider routing and reliability: One API covers 20+ providers; weighted balancing, retries, automatic failover, and semantic caching give operators tools to manage availability and repeated traffic.
Consumer controls: Virtual keys combine permissions, budgets, rate limits, and routing settings. This is useful for separating access across teams or applications, though the advanced enterprise governance set is reserved for Enterprise.
MCP and SDK integrations: Bifrost connects to external MCP servers and exposes tools to clients such as Claude Desktop. Documented SDK integrations include OpenAI, Anthropic, Google GenAI, LiteLLM, and LangChain.
Observability: Request monitoring, Prometheus metrics, and OpenTelemetry tracing integrations help operators track gateway traffic.
Security and deployment: Security practices include dependency and code scanning, Docker image scanning, and hardened non-root production containers. Deployment options include NPX, Docker, Kubernetes, and a Go binary, giving self-managing teams flexibility at the cost of operating the gateway themselves.

Pricing

OSS — 0.00 USD per free: Free forever, self-hosted, and licensed under Apache 2.0. NPX, Docker, Kubernetes, and Go binary deployment options make this the natural fit for developers and small teams willing to manage their own instance. It includes documentation, community, and self-management support rather than SLA-backed assistance.

Enterprise — custom pricing: Production deployments can start with a free 14-day enterprise license. Enterprise adds SSO, role-based access control, audit logs, guardrails, vault integrations, and private VPC deployments, along with SLA-backed support and direct engineer access. It fits teams running AI systems at scale; the trade-off is moving from a free self-managed edition to a custom-priced plan.

Platforms

Bifrost supports API, Linux, macOS, Windows, web, and self-hosted use. The range of self-hosting formats is useful for teams with different deployment environments, but it also means the OSS option places operations and support responsibility on the team.

Who it's for

Bifrost is a strong fit for developers and small teams that want one self-managed gateway for provider access, traffic controls, and monitoring. Enterprise is the better fit when production operations call for SSO, auditability, private VPC deployment, or direct support. It is less suitable for buyers seeking a turnkey hosted model service or a published enterprise price.

Pros and cons

Pro: A single OpenAI-compatible interface covers 20+ providers and MCP tool connections, reducing fragmentation across model and tool traffic.
Pro: Virtual keys, budgets, rate limits, routing controls, and failover give operators practical tools for sharing and managing gateway traffic.
Pro: The Apache 2.0 OSS edition is free forever and supports several self-hosted deployment formats.
Con: OSS support is documentation, community, and self-management, so teams needing an SLA or direct engineer access must consider Enterprise.
Con: SSO, role-based access control, audit logs, guardrails, vault integrations, and private VPC deployments require Enterprise, which has custom pricing.

Alternatives

Browse LLM Gateway Software for more options. Routerly is a free self-hosted alternative with no markup on API calls and an AGPL-3.0 license. YoloRouter offers a free self-hosted single binary, with SQLite included and PostgreSQL optional. Choose Kong Gateway if an open-source API gateway is a closer fit; its free plan is paired with a Konnect free trial. Helicone is another freemium option that describes itself as open source. LiteLLM may suit teams prioritizing broad provider coverage: its free self-hosted Open Source plan includes 100+ providers, virtual keys, spend tracking, budgets, and rate limits. Manifest offers a free plan with unlimited self-hosted use or 10,000 routed Cloud requests per month, along with 7-day dashboard retention. OpenRouter is a hosted API and web option with 25+ free models, four free providers, and a 50-request daily cap on its free plan. Requesty offers a free plan with 200 requests per day, routing, caching, fallbacks, and spend analytics.

Verdict

Choose Bifrost if your team wants a free, self-hosted control plane for routing provider, MCP tool, and agent traffic with per-consumer controls. Its main advantage is bringing those operational functions together behind one gateway. Look elsewhere if you need enterprise access controls or SLA-backed support without moving to a custom-priced plan.

	Bifrost	TensorZero
Free plan	Yes	No
Free trial	Yes	No
Paid from	Free	—
Open source	No	No
Platforms	api, Linux, macOS, self-hosted, Web, Windows	Web
Free plan	Yes	Yes
Fallback routing	Yes	Yes
Usage analytics	Yes	Yes
Self-hosted deployment	Yes	Yes
Budget controls	Yes	Yes
Virtual API keys	Yes	Yes

Bifrost vs TensorZero

Bifrost

TensorZero