5 Best Open Source LLM Gateways for Production AI Applications in 2026

LLM gateways provide a centralized layer between applications and AI providers, enabling unified APIs, model switching, credential management, failover, and observability, but also creating a high-value security target because they handle provider credentials and potentially sensitive request data. The discussion highlights an April 2026 SQL-injection vulnerability in LiteLLM, affecting versions 1.81.16 through 1.83.6, which was patched in version 1.83.7 before public disclosure; researchers later observed an exploitation attempt targeting credential-related database tables, though no confirmed credential theft was reported. It compares five gateway options: Prem Router, a managed beta service for multi-model, non-sensitive prototyping with an optional hardware-isolated Enclave API for confidential inference; LiteLLM, an MIT-licensed self-hosted proxy supporting more than 100 providers; Bifrost, an Apache 2.0 Go-based gateway focused on high throughput, secrets-manager integrations, and self-hosting; Traefik Labs, a Kubernetes- and GitOps-oriented platform whose advanced AI features are commercially offered; and Tyk, a self-hostable API gateway with AI routing, content filtering, and observability. Key evaluation criteria include provider coverage, licensing boundaries, credential storage, deployment requirements, failover, logging and metrics, data retention, patch history, and independent evidence supporting performance and security claims.

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