Bifrost by Maxim AI Alternatives: 7 Options for 2026

Originally published on the Leanroute blog.

Disclosure: this post is written by the Leanroute team, and Leanroute is one of the options below. We say plainly where each alternative, and Bifrost itself, is the better pick. Facts were checked against each vendor's documentation in November 2026; check their pricing pages before you decide.

TL;DR

Bifrost, from Maxim AI, is a fast open-source LLM gateway written in Go: Apache 2.0, OpenAI-compatible, with MCP, semantic caching and budgets built in. Teams look for alternatives for three reasons: they don't want to run another service themselves, they need features in the paid edition, or they need wider provider coverage. Quick picks:

• Want it self-hosted and open source, with the most providers: LiteLLM
• Want managed, with strong guardrails: Portkey
• Want hundreds of models behind one key: OpenRouter
• Already run Kong: Kong AI Gateway
• Already on Cloudflare or Vercel: their AI gateways
• Want managed BYOK, MCP tools on any model, and cost per agent run: Leanroute

Why teams look for a Bifrost alternative

Bifrost earns its reputation. Maxim publishes benchmarks showing about 11 microseconds of gateway overhead at 5,000 requests per second, far below Python gateways, and the core is open source. The reasons people look elsewhere are mostly about everything around the binary:

• It's self-hosted. A production deployment still needs a database, a cache, monitoring, secret rotation, upgrades and someone on call. Our working estimate for any self-hosted gateway carrying production traffic is several engineer-hours a week.
• Some features sit in the enterprise edition. Maxim sells an enterprise tier, and third-party listings disagree on exactly which capabilities (clustering, SSO, some governance features) it gates. Check the current docs for the features you need.
• Provider coverage. Bifrost supports a dozen-plus providers. If you need a long tail of models or a provider it doesn't cover, other gateways go wider.
• Your gateway latency may not matter. Bifrost's speed advantage is in the gateway's own overhead. When the upstream model takes 600 ms to several seconds, a few milliseconds of gateway time rarely shows up in what users feel.

The alternatives at a glance

1. LiteLLM: the open-source incumbent

What it is: a Python library and proxy server that translates one OpenAI-style API into 100+ providers. The most widely used open-source gateway.

Compared with Bifrost: slower on raw gateway overhead, but much wider provider coverage and a bigger community. Budgets per key, team and user. SSO beyond five users, audit logs and role-based access are in the paid Enterprise plan. In April 2026 a serious vulnerability (CVE-2026-35029) let authenticated users reach remote code execution; it was fixed in 1.83.0, which is a reminder that self-hosting includes patching.

Pick it when: you want open source and self-hosting, and provider breadth matters more than gateway latency. More in LiteLLM alternatives.

2. Portkey: managed, with a strong guardrails story

What it is: a gateway available as a managed service or as self-hosted open source (the gateway was open-sourced in March 2026). Portkey is now part of Palo Alto Networks.

Compared with Bifrost: you can let Portkey run it. It has a built-in guardrails library, fallbacks and load balancing, tracing by trace id, and an MCP gateway, with gateway-side tool execution in beta. Pricing has a free tier, then from $49 a month plus per-log fees.

Pick it when: you want a managed gateway with mature guardrails and you're comfortable with US hosting (EU on enterprise). More in Portkey alternatives.

3. OpenRouter: hundreds of models behind one key

What it is: a hosted model marketplace. One key and one bill for 400+ models, including many open-weight models.

Compared with Bifrost: a different category. Bifrost is software you run with your own provider accounts. OpenRouter is a service: you buy credits (5.5% fee) or bring your own keys, with no fee up to $25,000 a month of inference and 5% above. Requests pass through OpenRouter.

Pick it when: you want the widest catalog with nothing to operate, or you're prototyping across many models. More in OpenRouter vs LiteLLM.

4. Kong AI Gateway: if you already run Kong

What it is: AI plugins for Kong's API gateway: multi-model routing, semantic routing, prompt guards, token rate limiting and an MCP proxy.

Compared with Bifrost: the gateway core is open source (Apache 2.0), but most AI plugins (AI Proxy Advanced, semantic routing, the AI MCP Proxy) need Kong Enterprise or Konnect. Cost tracking per request and per consumer.

Pick it when: your company already runs Kong for its APIs and wants one gateway for both. More in Kong AI Gateway alternatives.

5. Cloudflare AI Gateway: free, on the edge

What it is: a managed gateway on Cloudflare's network. Caching, rate limiting, fallbacks, logs, and spend limits per gateway.

Compared with Bifrost: nothing to run, and the gateway itself is free (you pay providers directly, plus Workers usage). Provider keys can be stored in Cloudflare's Secrets Store. Content moderation and DLP live in Cloudflare's firewall. Less of an agent toolkit: MCP tool execution isn't a gateway feature.

Pick it when: you're already on Cloudflare and want basic gateway controls at no cost.

6. Vercel AI Gateway: if you build on Vercel

What it is: Vercel's managed gateway, built to pair with the AI SDK.

Compared with Bifrost: managed, with $5 a month of free credit and tokens at list price after that, provider routing and fallbacks, BYOK, budgets per API key, and spend reporting by user or tag. MCP tools run in your app through the AI SDK, not in the gateway.

Pick it when: your app already lives on Vercel and uses the AI SDK.

7. Leanroute: managed BYOK for agents and apps

What it is: our product. A managed, agent-native AI gateway hosted in Singapore. You bring your own provider keys (or use prepaid credits), and we run the gateway.

Compared with Bifrost:

• Nothing to operate. No servers, upgrades or patching on your side.
• MCP tools on any model. The gateway runs the tool loop itself, so GPT, Gemini or DeepSeek can use the same MCP servers as Claude, only on servers you've allowlisted.
• Cost per agent run. Send two headers and see each run's cost, models and tool calls.
• Controls built in. Guardrails (PII, secrets, prompt injection and more), and hard daily and monthly caps per organization and per key.
• Flat pricing. $15 or $25 a month for BYOK.

What we don't have: no SOC 2 report yet, one region, and 100+ curated models across 14 providers rather than hundreds.

Pick it when: you want your own provider keys and Bifrost-style controls without running a gateway, especially for agents.

When to stay on Bifrost

Bifrost is the right call more often than vendor lists admit:

• You have a platform team that already runs stateful services and is happy to run one more.
• Prompts must stay inside your network. Every managed option above, ours included, is a third party in the data path.
• Gateway overhead really is in your latency budget. Real-time voice and some high-throughput pipelines do measure it. Bifrost's Go data path is among the fastest available.
• You want to own and change the code. Apache 2.0 means you can fork it.

How to switch

Every gateway above speaks the OpenAI API, so moving is mostly configuration:

1. Pick the gateway and add your provider keys (or buy credits).
2. Change your client's base URL and API key. For Leanroute, that's https://api.leanroute.dev/v1 and a gw_live_ key; model ids use the provider/model form.
3. Send a slice of traffic through the new gateway for a week and compare latency, errors and cost.
4. Move the rest once the numbers agree.

Bottom line

Choose by who should run the gateway and what it must do. If you have the team and the need to self-host, Bifrost or LiteLLM. If you want someone else to run it, Portkey, Cloudflare, Vercel or Leanroute, depending on where you already build and whether you need agent features like MCP tools on any model and cost per run. If you want the most models with the least setup, OpenRouter.

For a side-by-side of all these gateways on one page, see our comparison table.

Sources:

• Bifrost on GitHub (Maxim AI) and Bifrost benchmarks
• LiteLLM pricing and CVE-2026-35029 advisory
• Portkey traces
• OpenRouter pricing
• Kong AI Gateway model cost management
• Cloudflare AI Gateway custom metadata
• Vercel AI Gateway custom reporting
• Self-hosting an LLM gateway (this blog)

FAQ

What are the best alternatives to Bifrost?

The main alternatives to Bifrost by Maxim AI are LiteLLM (open-source, self-hosted, widest provider coverage), Portkey (managed or self-hosted, strong guardrails), OpenRouter (hosted model marketplace), Kong AI Gateway (for teams already on Kong), Cloudflare AI Gateway and Vercel AI Gateway (managed, platform-native), and Leanroute (managed BYOK gateway with MCP tools on any model and cost per agent run).

Is there a managed version of Bifrost?

Bifrost is open-source software you run yourself; Maxim AI also sells an enterprise edition. If you want the same kind of gateway without operating it, managed options include Portkey, Cloudflare AI Gateway, Vercel AI Gateway and Leanroute.

Bifrost vs OpenRouter: which should I choose?

They solve different problems. Bifrost is gateway software you run inside your own infrastructure. OpenRouter is a hosted service that gives you hundreds of models behind one key, with a 5.5% fee on credits or BYOK with no fee up to $25,000 a month. Choose Bifrost if the gateway must run in your network, OpenRouter if you want hosted access to many models.

When should I stay on Bifrost?

Stay on Bifrost if you have a platform team to run it, if prompts must stay inside your own network, or if the gateway's own overhead is a measurable part of your latency budget. Its Go data path is among the fastest available.