Minimal core. Lightweight & extensible.
Start locally with one binary: no external database, queue, container runtime, or sidecar. Add providers, protocol adapters, tools, and telemetry as your deployment needs them.
View sourceThe open-source model router for your workflow
The minimal interpretable model router that learns & adapts to your agent workflows
$
curl --proto '=https' --tlsv1.2 -LsSf https://github.com/bitrouter/bitrouter/releases/latest/download/bitrouter-installer.sh | shInstall, then run
bro.any agent
any model
any compute
any data
Interpretable decisions. Under your control.
Follow a decision from workflow state to the matched rule and selected route. Keep policy in readable configuration, inspect resolution with bro route, and version it in Git.
Inspect model selectionA customizable router. Adapt it to your workflow.
Add models, providers, tools, and workflow-specific routing behind one stable request interface. Tune planning, routine work, verification, and recovery independently.
Customize BitRouterPricing & enterprise
Start open.Scale on your terms.
Routing is free whether you run the Apache-2.0 router yourself or use BitRouter Cloud. Pay provider token prices for hosted models, or work with us on your team requirements.
Free
$0 router feeYour infrastructure · your provider keys · no platform or request fee
Pay as you go
0% token markupManaged inference · routing included · processor top-up fees may apply
Enterprise
Custom servicesFree router · deployment · security · procurement · support
Questions.
BitRouter is an open-source LLM router that sits between your agent and model providers. It gives you one endpoint, then applies a routing policy you can inspect and change across models, providers, and reasoning levels.
A routing policy can keep routine steps on lower-cost models or reasoning levels and reserve stronger routes for work that needs them. Savings depend on your models, workload, prices, cache behavior, and policy — so BitRouter makes the decision trail and cost evidence inspectable rather than promising a universal percentage.
Yes. The routing core is licensed under Apache 2.0. You can inspect it, fork it, self-host it, and keep routing policy in files you review with the rest of your code.
BitRouter exposes an OpenAI-compatible endpoint and integration guides for common coding agents. You point the harness at BitRouter and choose a model or policy route; the exact environment variables depend on the harness.
Cloud runs the same open-source routing engine as a managed service. It adds the hosted endpoint, a managed provider network, consolidated billing, and hosted request receipts. Self-hosting remains available when you want to run the router in your own infrastructure.