5 best model routers I've tested in 2026

Model routers direct AI requests to models or providers based on factors such as task complexity, cost, availability, governance rules, and performance, while gateways additionally centralize API access, authentication, logging, and billing. The comparison distinguishes automated model-selection tools from provider failover systems and rule-based gateways: Gumloop routes tasks within its enterprise agent platform by estimated difficulty and can escalate models during a run, with organization-level allow-lists; OpenRouter provides an OpenAI-compatible API, access to more than 500 models, provider failover, and an optional Auto mode based on community spending patterns; LiteLLM is a self-hosted open-source gateway that supports configurable failover and a beta tier-based router managed by users; Microsoft Foundry Model Router is aimed at Azure users and selects from a curated model pool through Balanced, Cost, or Quality modes; and Prisma AIRS AI Gateway, formerly Portkey, offers policy-driven routing, observability, and flexible deployment but requires teams to define routing rules. Pricing ranges from free self-hosted or developer plans to usage-based fees, monthly subscriptions, and custom enterprise contracts, with the appropriate choice depending on whether an organization needs automated selection, reliable provider failover, centralized governance, or integration with existing Azure, application, or agent infrastructure.

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