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Samir Hanna Verza 2026-10-14 10:49:08 -05:00 • committed by GitHub
commit a2fdcff53b
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2 changed files with 68 additions and 1 deletions

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@ -7,7 +7,9 @@ from typing import Any, cast
@lru_cache(maxsize=512)
def resolve_litellm_model(model: str) -> str | None:
def resolve_litellm_model( # noqa: PLR0911 - each resolution path returns its own name
model: str,
) -> str | None:
"""Return a provider-qualified model name that LiteLLM can price."""
try:
import litellm
@ -39,6 +41,22 @@ def resolve_litellm_model(model: str) -> str | None:
matches = sorted(key for key in model_cost if key.endswith(f"/{name}"))
if not matches:
continue
# Prefer the first-party provider's own listing over an aggregator's
# re-listing of the same model. Aggregators (OpenRouter, DeepInfra,
# Perplexity, ...) re-key a model under a namespaced path such as
# "openrouter/x-ai/grok-4.5"; the native listing is the one whose key
# is exactly "<litellm_provider>/<name>" ("xai/grok-4.5"). When that
# is unique it is the canonical name, so tie-break on it before
# falling back to price consensus (which would otherwise pick the
# alphabetically first key, an aggregator).
native = [
key
for key in matches
if isinstance(model_cost.get(key), dict)
and key == f"{model_cost[key].get('litellm_provider')}/{name}"
]
if len(native) == 1:
return native[0]
prices = {
(
model_cost[key].get("input_cost_per_token"),

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@ -127,3 +127,52 @@ def test_resolver_does_not_guess_between_differently_priced_providers() -> None:
finally:
litellm.model_cost = original
resolve_litellm_model.cache_clear()
def test_resolver_prefers_native_provider_over_aggregator() -> None:
# The same model re-listed by an aggregator (which sorts first) and by its
# first-party provider at the same price. The resolver must return the
# native listing, not the alphabetically first aggregator key.
original = litellm.model_cost
litellm.model_cost = {
"openrouter/x-ai/grok-4.5": {
"litellm_provider": "openrouter",
"input_cost_per_token": 2e-06,
"output_cost_per_token": 6e-06,
},
"xai/grok-4.5": {
"litellm_provider": "xai",
"input_cost_per_token": 2e-06,
"output_cost_per_token": 6e-06,
},
}
try:
resolve_litellm_model.cache_clear()
assert resolve_litellm_model("grok-4.5") == "xai/grok-4.5"
finally:
litellm.model_cost = original
resolve_litellm_model.cache_clear()
def test_resolver_prefers_unique_native_provider_over_differently_priced_aggregators() -> None:
# A unique first-party listing wins even when aggregators price the model
# differently, where price consensus alone would give up and return None.
original = litellm.model_cost
litellm.model_cost = {
"deepinfra/x/example-model": {
"litellm_provider": "deepinfra",
"input_cost_per_token": 1e-06,
"output_cost_per_token": 2e-06,
},
"example/example-model": {
"litellm_provider": "example",
"input_cost_per_token": 5e-06,
"output_cost_per_token": 9e-06,
},
}
try:
resolve_litellm_model.cache_clear()
assert resolve_litellm_model("example-model") == "example/example-model"
finally:
litellm.model_cost = original
resolve_litellm_model.cache_clear()