Best LLM gateways in 2026

LLM gateways provide a unified layer between applications and multiple model providers for routing, failover, cost management, guardrails, and request-level observability, helping organizations reduce vendor lock-in and manage a rapidly expanding model landscape. The comparison highlights Inworld Router for business-metric-based routing, OpenRouter for broad model access and rapid experimentation, LiteLLM for self-hosted control, Portkey for compliance-oriented gateway features, Braintrust Gateway for observability and output evaluation, and Helicone for lightweight analytics, while noting differences in routing sophistication, deployment, pricing, and product maturity. It also warns that self-hosted LiteLLM users should ensure they are running clean releases following a March 2026 supply-chain compromise. The central distinction is that gateways can document models, costs, latency, and failures but do not establish whether generated outputs are accurate, policy-compliant, or suitable for consequential decisions. For regulated use cases, the text argues that organizations need an additional output-level governance layer, such as Dataiku LLM Mesh, to evaluate quality, maintain audits tied to outputs and recipients, and apply business-rule safeguards alongside existing gateway infrastructure.

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