Route to the model that offers the best accuracy-to-cost ratio — the Pareto frontier of the catalog.
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The Pareto Router selects the model that sits on the efficiency frontier: the highest accuracy available for a given DA cost. Unlike the Auto Router (which optimizes for task fit) or Auto Exacto (which maximizes accuracy regardless of cost), the Pareto Router balances both — it never picks a model that is dominated by a cheaper, equally accurate alternative.
The model field in the response tells you which model was selected and why it was on the frontier at the time of the request.
OpenDunes continuously scores the catalog on two axes:
A model is on the Pareto frontier if no other model is both cheaper and more accurate. The Pareto Router always selects from this frontier.
As model prices and benchmark scores change — which they do regularly — the frontier shifts. The router uses a catalog snapshot updated every few minutes.
By default, the router picks the point on the frontier with the best accuracy at any cost. To shift toward cost savings, pass a pareto_bias value:
| Value | Behavior |
|---|---|
0.0 (default) | Highest accuracy on the frontier |
0.5 | Balanced — midpoint of the frontier |
1.0 | Lowest cost on the frontier |
Combine max_cost_da with the Pareto Router to limit the candidate frontier:
Only frontier models with an estimated per-request cost at or below max_cost_da are considered.
| Router | Best for |
|---|---|
| Auto | General task-based routing; convenience |
| Auto Exacto | Maximum accuracy, cost secondary |
| Pareto | Best accuracy per DA spent; cost-aware without sacrificing quality unnecessarily |
| Free Models Router | Zero cost, lower accuracy |
The Pareto Router is best suited for production workloads where you want the highest quality within a budget — not the cheapest, and not the most expensive, but the most efficient.
You pay the selected model's normal per-token DA rate. The Pareto Router itself has no surcharge. Since the router targets frontier models, costs are typically in the mid-range of the catalog.