Antirion

Antirion sits between your apps and every LLM provider, and it is built to never be the slow part. One Rust binary with the console built in: point any OpenAI or Anthropic SDK at it and get fallbacks across providers, budgets per team and key, PII and secrets redaction, caching, and a log of every request with its route and cost. On 4 vCPUs it adds 0.5 ms at 5,000 RPS and holds 14,000 RPS, 4x Bifrost. Open source and self-hosted.

Engineering and platform teams running LLM apps in production who need routing, fallbacks, budgets and observability across providers without added latency.

Most AI gateways add 10-20 ms of overhead per request and become a bottleneck at scale. Teams calling multiple LLM providers also end up rebuilding the same plumbing: provider fallbacks, per-team budgets, PII and secrets redaction, caching, and request logging with cost tracking. Antirion handles all of that in a single self-hosted Rust binary that adds about 0.5 ms, so the gateway is never the slow part.