HTTP request
X-Vertex-AI-LLM-Shared-Request-Type: priority
Vertex AI
Vertex response
usageMetadata.trafficType = ON_DEMAND_PRIORITY
LiteLLM stores it
_hidden_params.provider_specific_fields.traffic_type
completion_cost()
Maps traffic_type → service_tier = "priority"
Pricing lookup
input/output_cost_per_token_priority
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