Amazon Bedrock Mantle

Amazon Bedrock Mantle is Amazon Bedrock's distributed inference engine (Project Mantle) that exposes an OpenAI-compatible API for Bedrock-hosted models.

Use this provider to call Bedrock Mantle models with accurate AWS Bedrock pricing instead of OpenAI pricing.

tip

We support ALL Bedrock Mantle models, just set model=bedrock_mantle/<model-id> as a prefix when sending litellm requests

API Key

# env variable
os.environ['BEDROCK_MANTLE_API_KEY'] = "your-aws-bedrock-api-key"

# optional: override region (defaults to us-east-1)
os.environ['BEDROCK_MANTLE_REGION'] = "us-east-1"  # or use AWS_REGION

Supported Models

Model	Context Window	Input (per 1M tokens)	Output (per 1M tokens)
openai.gpt-oss-120b	131K	$0.15	$0.60
openai.gpt-oss-20b	131K	$0.075	$0.30
openai.gpt-oss-safeguard-120b	131K	$0.15	$0.60
openai.gpt-oss-safeguard-20b	131K	$0.075	$0.30

Sample Usage

SDK

from litellm import completion
import os

os.environ['BEDROCK_MANTLE_API_KEY'] = "your-bedrock-api-key"

response = completion(
    model="bedrock_mantle/openai.gpt-oss-120b",
    messages=[{"role": "user", "content": "hello from litellm"}],
)
print(response)

Streaming

from litellm import completion
import os

os.environ['BEDROCK_MANTLE_API_KEY'] = "your-bedrock-api-key"

response = completion(
    model="bedrock_mantle/openai.gpt-oss-120b",
    messages=[{"role": "user", "content": "hello from litellm"}],
    stream=True,
)

for chunk in response:
    print(chunk)

Async

import asyncio
from litellm import acompletion
import os

os.environ['BEDROCK_MANTLE_API_KEY'] = "your-bedrock-api-key"

async def main():
    response = await acompletion(
        model="bedrock_mantle/openai.gpt-oss-120b",
        messages=[{"role": "user", "content": "hello from litellm"}],
    )
    print(response)

asyncio.run(main())

Region Configuration

The API base URL is https://bedrock-mantle.{region}.api.aws/v1. Region is resolved in this order:

1. BEDROCK_MANTLE_REGION env var
2. AWS_REGION env var
3. Default: us-east-1

Supported regions: us-east-1, us-east-2, us-west-2, eu-west-1, eu-west-2, eu-central-1, eu-south-1, eu-north-1, ap-northeast-1, ap-south-1, ap-southeast-3, sa-east-1

import os
os.environ['BEDROCK_MANTLE_REGION'] = "eu-west-1"

# or pass api_base directly
response = completion(
    model="bedrock_mantle/openai.gpt-oss-120b",
    messages=[{"role": "user", "content": "hello"}],
    api_base="https://bedrock-mantle.eu-west-1.api.aws/v1",
)

Usage with LiteLLM Proxy

1. Set Bedrock Mantle models on config.yaml

model_list:
  - model_name: gpt-oss-120b
    litellm_params:
      model: bedrock_mantle/openai.gpt-oss-120b
      api_key: os.environ/BEDROCK_MANTLE_API_KEY
      # optional region override:
      api_base: "https://bedrock-mantle.us-east-1.api.aws/v1"

  - model_name: gpt-oss-20b
    litellm_params:
      model: bedrock_mantle/openai.gpt-oss-20b
      api_key: os.environ/BEDROCK_MANTLE_API_KEY

2. Start the proxy

litellm --config /path/to/config.yaml

3. Send a request

import openai

client = openai.OpenAI(
    api_key="anything",
    base_url="http://0.0.0.0:4000",
)

response = client.chat.completions.create(
    model="gpt-oss-120b",
    messages=[{"role": "user", "content": "hello from litellm"}],
)
print(response)