Alternatives / OpenRouter
Looking for an open source OpenRouter alternative? We compared 3 open source LLM gateways by license, self-hosting, provider support, budgets, guardrails, and pricing. They route requests to many model providers through one OpenAI-compatible API that you run yourself.
Written by Maxime DERAME
Last updated:
| Alternative | Best for | License |
|---|---|---|
| LiteLLM | Most widely used LLM proxy and gateway | MIT + enterprise directory |
| Bifrost | High-performance enterprise gateway | Apache-2.0 |
| LLM Gateway | Routing and analytics with a hosted option | AGPL-3.0 + EE |
We looked for open-source tools that overlap with OpenRouter's core: one OpenAI-compatible API in front of many model providers, with routing, fallbacks, and cost tracking. We verified each project's license, recent activity, stars, and self-hosting in its repository. OpenRouter is a hosted marketplace with unified billing, while these are gateways you deploy and connect to your own provider accounts and keys. See our methodology for the full criteria.
OpenRouter sells access to many models with pooled credits and a single invoice. LiteLLM, Bifrost, and LLM Gateway proxy requests to providers you already have accounts with, so you manage provider keys and billing yourself. LLM Gateway also offers a hosted plan with a gateway fee for people who prefer a managed option.
All three normalize requests to the OpenAI format, support many providers such as OpenAI, Anthropic, and Google, and add usage analytics and cost tracking. LiteLLM and Bifrost add virtual keys with budgets, rate limits, load balancing, fallbacks, and guardrails, and Bifrost also includes an MCP gateway and claims much lower latency than LiteLLM.
LiteLLM is MIT outside its enterprise directory, which is under a separate license and adds features such as SSO and audit logs. Bifrost is Apache-2.0. LLM Gateway is AGPL-3.0 outside its ee directory, which is under a commercial license, and multi-organization administration needs a white-label license.
All three can be self-hosted for free. LiteLLM sells an enterprise tier and a hosted proxy, Bifrost offers a free enterprise trial, and LLM Gateway has a free plan with a 5 percent gateway fee, a Pro plan at $50 per month, and custom enterprise pricing.
LiteLLM, Bifrost, and LLM Gateway were all updated within days of this update.
OpenRouter is a hosted service that gives one API and one bill for hundreds of models, adding a markup and routing your prompts through its servers. Open-source gateways let you route to providers directly with your own keys, set budgets and rate limits per team, add guardrails and logging, and keep prompts inside your infrastructure, at the cost of operating the gateway and managing provider accounts yourself.
| Alternative | Type | License | Self-hosted | Best for |
|---|---|---|---|---|
| LiteLLM | LLM proxy and gateway | MIT + enterprise directory | Yes | Platform teams |
| Bifrost | AI gateway | Apache-2.0 | Yes | Low-latency enterprise use |
| LLM Gateway | LLM gateway | AGPL-3.0 + EE | Yes | Routing and analytics |
Want the most widely adopted open-source LLM gateway
LiteLLM proxies 100+ LLMs in OpenAI format with virtual keys, budgets, rate limits, fallbacks, and integrations with observability tools.
Need maximum gateway performance
Bifrost is a Go-based gateway under Apache-2.0 with virtual keys, guardrails, an MCP gateway, and OpenTelemetry support.
Want routing and analytics with an optional hosted plan
LLM Gateway offers an OpenAI-compatible API, usage analytics, and key management, self-hosted for free or on a paid hosted plan.