US-Only Inference

US-only inference is available on the Pro and Enterprise plans.

Add routing.allowed_countries: ["US"] to run an inference request on United States compute.

curl https://api.sailresearch.com/v1/responses \
  -H "Authorization: Bearer $SAIL_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "model": "zai-org/GLM-5.3-Flash",
    "input": "Explain the key ideas behind transformers.",
    "metadata": {
      "completion_window": "asap"
    },
    "routing": {
      "allowed_countries": ["US"]
    }
  }'

The restriction applies per request. Omitting routing.allowed_countries or passing an empty list leaves the request unrestricted by country. Only US is supported. Unsupported countries or malformed values return HTTP 400 with error type invalid_request_error.

Pricing

The surcharge is added to the selected model and completion window’s per-token rates.

Plan	US-only surcharge
Pro	20%
Enterprise	10%

See the plan comparison for the other benefits included with each plan.

When US capacity is unavailable

US-only requests never fall back outside the United States.

asap returns HTTP 429. Retry after the delay in the Retry-After header.
balanced and flex wait for US capacity until the request deadline. Set background: true to submit and poll for the result.

Model availability

Use a model from Sail’s model catalog and a completion window it supports. If your workload has specific capacity needs, contact support.

Getting started

Inference

Sailboxes

Guides

Voyages

Security & compliance

Pricing

When US capacity is unavailable

Model availability

​Pricing

​When US capacity is unavailable

​Model availability

Pricing

When US capacity is unavailable

Model availability