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Amazon Bedrock Mantle is AWS’s OpenAI-compatible inference engine for Bedrock models. The bedrock-mantle provider in Portkey routes requests to bedrock-mantle.{region}.api.aws, giving you access to Bedrock models via:
  • /v1/chat/completions (OpenAI Chat Completions)
  • /v1/responses (OpenAI Responses)
  • /v1/messages (Anthropic-native, via bedrock-mantle.{region}.api.aws/anthropic/v1)
Use bedrock-mantle when you want OpenAI-compatible access to Bedrock. For the classic Bedrock runtime (Converse / InvokeModel), use the bedrock provider.

Quick Start

Add Provider in Model Catalog

Configure a new provider with Bedrock Mantle as the provider type. Choose one of the supported auth modes: awsRegion determines which regional endpoint is used (e.g., us-east-1 → bedrock-mantle.us-east-1.api.aws).

Anthropic Messages API

Requests to /v1/messages or chat completions with anthropic.* models are routed to the Mantle Anthropic base path (/anthropic/v1). Pass the Anthropic version via the anthropic-version header or anthropic_version in the request body (defaults to 2023-06-01).

Amazon Bedrock Mantle Documentation

Official AWS documentation for Bedrock Mantle endpoints, supported regions, and models.

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Last modified on August 3, 2026