What is Antirion?
Antirion is an AI developer tool and open-source AI gateway, written in Rust, that gives engineering teams one unified endpoint for calling OpenAI, Anthropic, Gemini, Bedrock, and any OpenAI-compatible server. Instead of wiring each provider into your app, you point the official SDKs, LangChain, or the Vercel AI SDK at a local gateway on localhost:8080 and route every LLM call through it unchanged. From there Antirion handles the governance layer most teams build by hand: fallback chains, weighted splits, and least-cost or least-latency routing with retries and circuit breakers, plus per-org, per-team, per-project, and per-key rate limits and dollar or token budgets. It adds safety guardrails such as PII and secrets detection, regex and JSON-schema checks, tool permissions, and LLM judges, and includes exact and semantic caching with per-model hit-rate tracking. Enterprise plumbing is built in too: SSO via OIDC, SAML, or GitHub, SCIM, audit logs, and Prometheus or OTLP observability, all behind an integrated admin console with no separate infrastructure to deploy. The project reports 0.53ms p50 latency at 5,000 RPS. For teams evaluating the best AI gateway for multi-provider LLM routing, Antirion is a self-hostable, Apache 2.0 option worth a look in the BestAIFor directory.
What is Antirion used for?
Centralizing and governing LLM calls across multiple AI providers: routing, cost budgets, rate limits, guardrails, caching, and observability.
How much does Antirion cost?
Free
Free and open source under the Apache 2.0 license — all features included, no paid tier
Pros and cons
Pros
- Single endpoint routes to OpenAI, Anthropic, Gemini, Bedrock, and any OpenAI-compatible server with SDKs unchanged
- Fallback chains, weighted splits, and least-cost or least-latency routing with retries and circuit breakers
- Per-org, per-team, per-project, and per-key rate limits and dollar or token budgets
- Built-in guardrails: PII and secrets detection, regex, JSON schemas, tool permissions, and LLM judges
- Exact and semantic caching with per-model hit-rate tracking, plus SSO, SCIM, and audit logs
Cons
- Self-hosted and open source, so you run and maintain the gateway yourself rather than buying a managed service
- Written in Rust, which may be unfamiliar to teams that want to extend the core
- No managed cloud or paid support tier is offered; everything ships under Apache 2.0
- Published latency benchmarks are vendor-reported and not independently verified
Questions about Antirion
What is Antirion used for?
Antirion is an open-source AI gateway that sits between your application and multiple AI providers. Teams use it to route every LLM call through one endpoint, enforce cost budgets and rate limits, apply safety guardrails, and cache responses across OpenAI, Anthropic, Gemini, and Bedrock.
Is Antirion free?
Yes. Antirion is free and open source under the Apache 2.0 license, and every feature is included with no paid tier. You self-host it, so your only costs are the infrastructure you run it on and the underlying model provider usage.
Which AI providers does Antirion support?
Antirion supports OpenAI, Anthropic, Gemini, and Bedrock, and can call any OpenAI-compatible server. You point the official SDKs, LangChain, or the Vercel AI SDK at the gateway on localhost:8080 and they work unchanged.
Antirion vs LiteLLM or a managed AI gateway?
Antirion is a Rust, self-hosted, Apache 2.0 gateway with built-in budgets, guardrails, caching, SSO, and audit logs in one console. Unlike a managed SaaS gateway you run it yourself, which trades vendor support for full control and no per-request fees.
What are the best alternatives to Antirion?
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