One base URL. Every language you already write.

pip install "opensmartroute[yaml]"

from opensmartroute import (
    Objective, RequestConstraints, RouteRequest,
    Router, load_rules, load_targets,
)
from opensmartroute.strategies import (
    default_strategies,
)

router = Router(
    load_targets("targets.yaml"),
    strategies=[
        load_rules("rules.yaml"),
        *default_strategies(),
    ],
)

req = RouteRequest(
    "Prove that sqrt(2) is irrational.",
    constraints=RequestConstraints(
        max_cost_per_1k=0.02,
    ),
    objective=Objective(quality=1.0, cost=0.4),
)
d = router.route(req, plan=True)
print(d.target.id, f"{d.confidence:.2f}")
# per-strategy scores and rationales
print(d.trace.explain())
# who was filtered out, and why
print(d.trace.policy_rejections)

Zero runtime dependencies. plan=True returns the ranked runners-up and every policy rejection with the winner.