LLM Routing Tools Compared in 2026: Bifrost Leads With 11-Microsecond Overhead

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Model routing tools have evolved to dynamically direct AI inference requests across multiple LLM providers based on cost, latency, and provider health. Production applications that send all prompts to a single frontier model typically overspend by 40–80% on simple queries while remaining vulnerable to provider outages and rate limits. Bifrost, an open-source AI gateway built in Go by Maxim AI, tops the 2026 rankings by delivering sub-millisecond gateway overhead of just 11 microseconds at 5,000 requests per second. Other notable tools include open-source proxy LiteLLM, classifier-based RouteLLM, and hosted aggregator OpenRouter, each addressing different routing needs with distinct trade-offs. Engineering teams evaluating routing platforms are advised to assess six key dimensions: routing logic expressiveness, runtime latency, failover capability, provider coverage, governance controls, and deployment flexibility.

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