Antirion

Antirion is an open-source AI gateway that routes, retries, budgets, and guards LLM calls between applications and model providers.

Antirion is an open-source AI gateway that sits between your applications and model providers. It routes requests, manages budgets, applies guardrails, and provides observability for every language model call. The software speaks OpenAI, Anthropic, Gemini, and Bedrock, and translates dialects so any client can call any provider. It includes features like exact and semantic caching, fallback chains, rate limiting, and SSO without any paid tier restrictions. You can run it as a standalone node with an embedded store or as a cluster using PostgreSQL and Valkey.

Antirion at a glance

Best for: Software engineer
Runs on: Docker, Kubernetes, Linux, Binary
Pricing: Free
Released: October 2026
Category: AI coding tool
Website: antirion.ai

Key features

Route LLM calls with fallbacks and weighted splits
Control spend with rate limits and budgets in dollars or tokens
Inspect requests with metrics, logs, and token counts
Apply safety guardrails for PII, secrets, and moderation
Cache responses with exact and semantic matching
Manage access with SSO, SCIM, and audit logs
Configure via YAML, API, or the built-in web console

Use it for

Manage and route traffic across multiple LLM providers
Enforce cost budgets and rate limits on AI usage
Mask PII and apply safety guardrails to AI prompts
Cache frequent requests to reduce model spend

Alternatives to Antirion

OmniRoute — Routes requests across 352 providers with automatic fallback and cost-based selection.
OrcaRouter — Route requests to the best models without paying token markups.
Google Antigravity — It allows local management and parallel execution of autonomous coding agents.
Bifrost — High-performance gateway with 20 microsecond overhead and 5000 requests per second throughput.
AG-UI — Standardizes agent-user interactions and generative UI for applications.
GoRoute — Consumes 5.1MB of RAM with sub-10ms latency for coding agents.
Anti Slop — Filters out generic AI-generated UI designs, text, and code.
ARBR — Unifies routing, budgets, and governance behind one OpenAI-compatible endpoint.
ClawRouter — Routes requests across 82 models locally in under 1ms to reduce AI API costs.
Guardrails AI — It detects and mitigates specific risks and generates structured data from LLMs.
Respan — Route requests to over 1,000 models with built-in fallback and observability.
Manifest LLM Gateway — It autofixes bad requests and routes calls across multiple providers with zero downtime.

All Antirion alternatives