Tool
One API in front of every model — with the bill itemized.
A model-routing service that puts one API in front of many providers’ models, with per-call usage and cost accounting — a common way agent builders compare models and meter spend across the ecosystem.
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Latest: Aug 24, 2026
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OpenRouter is an aggregation layer for language models: a single API that routes requests to models from many providers, so a builder can switch or compare models without re-integrating each one. It returns usage and cost accounting per call, which makes it a practical place to meter and attribute agent spend.
That cost visibility is why it matters to the agent ecosystem specifically. Agents are loops of calls, and the economics of agent labor live in the aggregate of those calls, not the headline per-token price. A routing layer that itemizes spend is part of how teams keep multi-step and multi-agent workloads from becoming a billing-dashboard surprise.
Anthropic's flagship Fable model is losing ground to cheaper alternatives because sophisticated teams have discovered that a better harness plus a good-enough model beats a great model at premium prices.
Stripe's reported $7B move for OpenRouter and Glean's routing-heavy enterprise business point to the same shift: the frontier model is becoming a commodity input, and routing is the layer that decides your agent's real behavior.
