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Portkey exposes Google Vertex AI’s Discovery Engine ranking API through the unified /v1/rerank endpoint.
Enable the Discovery Engine API on the GCP project backing your Vertex AI provider before making rerank requests.

Supported Models

  • semantic-ranker-default@latest (default)
  • semantic-ranker-fast@latest
  • semantic-ranker-512@latest
  • Specific versions: semantic-ranker-default-004, semantic-ranker-fast-004, semantic-ranker-default-003, semantic-ranker-default-002

Rerank documents

Parameters

Google Vertex AI Ranking API

Official documentation for the Vertex AI Discovery Engine ranking API.

Portkey is now PRISMA AIRS AI Gateway. See it in action.

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Last modified on August 3, 2026