AWS Bedrock ↗

instructor guide intermediate
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Original Documentation

This guide demonstrates how to use AWS Bedrock with Instructor to generate structured outputs. You’ll learn how to use AWS Bedrock’s LLM models with Pydantic to create type-safe, validated responses.

Prerequisites#

You’ll need to have an AWS account with access to Bedrock and the appropriate permissions. You’ll also need to set up your AWS credentials.

pip install "instructor[bedrock]"

See Also#

AWS Bedrock#

AWS Bedrock is a fully managed service that offers a choice of high-performing foundation models (FMs) from leading AI companies like AI21 Labs, Anthropic, Cohere, Meta, Stability AI, and Amazon through a single API.

Auto Client Setup#

For simplified setup, you can use the auto client pattern:

import instructor

# Auto client with model specification
client = instructor.from_provider("bedrock/anthropic.claude-3-5-sonnet-20241022-v2:0")

# The auto client automatically handles:
# - AWS credential detection from environment
# - Region configuration (defaults to us-east-1)
# - Mode selection based on model (Claude models use TOOLS)

Deprecation Notice#

Deprecation Notice:

The _async argument to instructor.from_bedrock is deprecated. Please use async_client=True for async clients instead. Support for _async may be removed in a future release. All new code and examples should use async_client.

Environment Configuration#

Set your AWS credentials and region:

export AWS_ACCESS_KEY_ID=your_access_key
export AWS_SECRET_ACCESS_KEY=your_secret_key
export AWS_DEFAULT_REGION=us-east-1

Or configure using AWS CLI:

aws configure

Sync Example#

import boto3
import instructor
from pydantic import BaseModel

bedrock_client = boto3.client('bedrock-runtime')
client = instructor.from_provider("bedrock/claude-3-5-sonnet-20241022")

class User(BaseModel):
    name: str
    age: int

user = client.create(
    modelId="anthropic.claude-3-sonnet-20240229-v1:0",
    messages=[
        {"role": "user", "content": "Extract: Jason is 25 years old"},
    ],
    response_model=User,
)

print(user)
# > User(name='Jason', age=25)

Async Example#

Warning: AWS Bedrock’s official SDK (boto3) does not support async natively. If you need to call Bedrock from async code, you can use asyncio.to_thread to run synchronous Bedrock calls in a non-blocking way.

import instructor
from pydantic import BaseModel
import asyncio

client = instructor.from_provider("bedrock/anthropic.claude-3-sonnet-20240229-v1:0")

class User(BaseModel):
    name: str
    age: int

def get_user():
    return client.create(
        modelId="anthropic.claude-3-sonnet-20240229-v1:0",
        messages=[{"role": "user", "content": "Extract Jason is 25 years old"}],
        response_model=User,
    )

async def get_user_async():
    return await asyncio.to_thread(get_user)

user = asyncio.run(get_user_async())
print(user)

Supported Modes#

AWS Bedrock supports the following core modes:

  • TOOLS: Uses function calling for models that support it (like Claude models)
  • MD_JSON: Direct JSON response generation (text extraction fallback)

Legacy modes (BEDROCK_TOOLS, BEDROCK_JSON) are deprecated and map to Mode.TOOLS and Mode.MD_JSON. modes above. Use TOOLS or MD_JSON in new code.

import boto3
import instructor
from instructor import Mode
from pydantic import BaseModel

# Use from_provider for simplified setup
client = instructor.from_provider("bedrock/anthropic.claude-3-5-sonnet-20241022-v2:0", mode=Mode.TOOLS)

# Or if you need to use a custom boto3 client:
# bedrock_client = boto3.client('bedrock-runtime')
# client = instructor.from_provider("bedrock/anthropic.claude-3-5-sonnet-20241022-v2:0", client=bedrock_client, mode=Mode.TOOLS)

class User(BaseModel):
    name: str
    age: int

OpenAI Compatibility: Flexible Input Format and Model Parameter#

Instructor’s Bedrock integration supports both OpenAI-style and Bedrock-native message formats, as well as any mix of the two. You can use either:

  • OpenAI-style:
    {"role": "user", "content": "Extract: Jason is 25 years old"}
  • Bedrock-native:
    {"role": "user", "content": [{"text": "Extract: Jason is 25 years old"}]}
  • Mixed:
    You can freely mix OpenAI-style and Bedrock-native messages in the same request. The integration will automatically convert OpenAI-style messages to the correct Bedrock format, while preserving any Bedrock-native fields you provide.

This flexibility also applies to other keyword arguments, such as the model name:

  • You can use either model (OpenAI-style) or modelId (Bedrock-native) as a keyword argument.
  • If you provide model, Instructor will automatically convert it to modelId for Bedrock.
  • If you provide both, modelId takes precedence.

Example:

import instructor

messages = [
    {"role": "system", "content": "Extract the name and age."},  # OpenAI-style
    {"role": "user", "content": [{"text": "Extract: Jason is 25 years old"}]},  # Bedrock-native
    {"role": "assistant", "content": "Sure! Jason is 25."},  # OpenAI-style
]

# Both of these are valid:
user = client.create(
    model="anthropic.claude-3-sonnet-20240229-v1:0",  # OpenAI-style
    messages=messages,
    response_model=User,
)

user = client.create(
    modelId="anthropic.claude-3-sonnet-20240229-v1:0",  # Bedrock-native
    messages=messages,
    response_model=User,
)

All of the above will work seamlessly with Instructor’s Bedrock integration.

Multimodal: Images and Documents#

Instructor will convert OpenAI-style image parts into Bedrock image blocks automatically. For documents (PDFs), Bedrock expects a native document block, so you should either pass a Bedrock-native document dict directly or build one with the PDF helper.

import instructor
from instructor.processing.multimodal import PDF

client = instructor.from_provider("bedrock/anthropic.claude-3-5-sonnet-20241022-v2:0")

pdf = PDF.from_url("https://raw.githubusercontent.com/instructor-ai/instructor/main/tests/assets/invoice.pdf")

response = client.create(
    modelId="anthropic.claude-3-sonnet-20240229-v1:0",
    messages=[
        {
            "role": "user",
            "content": [
                "Analyze this document",
                pdf.to_bedrock(),
            ],
        }
    ],
)

Bedrock document blocks also support S3 URIs (for example, s3://bucket/key.pdf) and local files; PDF.to_bedrock() will load the bytes and sanitize the document name for you.

Nested Objects#

import boto3
import instructor
from pydantic import BaseModel

# Initialize the Bedrock client
bedrock_client = boto3.client('bedrock-runtime')

# Enable instructor patches for Bedrock client
client = instructor.from_provider("bedrock/claude-3-5-sonnet-20241022")


class Address(BaseModel):
    street: str
    city: str
    country: str


class User(BaseModel):
    name: str
    age: int
    addresses: list[Address]


# Create structured output with nested objects
user = client.create(
    modelId="anthropic.claude-3-sonnet-20240229-v1:0",
    messages=[
        {
            "role": "user",
            "content": """
            Extract: Jason is 25 years old.
            He lives at 123 Main St, New York, USA
            and has a summer house at 456 Beach Rd, Miami, USA
        """,
        },
    ],
    response_model=User,
)

print(user)
#> User(
#>     name='Jason',
#>     age=25,
#>     addresses=[
#>         Address(street='123 Main St', city='New York', country='USA'),
#>         Address(street='456 Beach Rd', city='Miami', country='USA')
#>     ]
#> )

Modern Models and Features#

Latest Model Support#

AWS Bedrock supports many modern foundation models:

import instructor

# Claude 3.5 models (latest)
client = instructor.from_provider("bedrock/anthropic.claude-3-5-sonnet-20241022-v2:0")
# or
client = instructor.from_provider("bedrock/anthropic.claude-3-5-haiku-20241022-v1:0")

# Amazon Nova models (multimodal)
client = instructor.from_provider("bedrock/amazon.nova-micro-v1:0")

# Meta Llama 3 models
client = instructor.from_provider("bedrock/meta.llama3-70b-instruct-v1:0")

# Mistral models
client = instructor.from_provider("bedrock/mistral.mistral-large-2402-v1:0")

Advanced Configuration#

import boto3
import instructor

# Custom AWS configuration
bedrock_client = boto3.client(
    'bedrock-runtime',
    region_name='us-west-2',
    aws_access_key_id='your_key',
    aws_secret_access_key='your_secret'
)

# Use from_provider with custom client
client = instructor.from_provider(
    "bedrock/anthropic.claude-3-5-sonnet-20241022-v2:0",
    client=bedrock_client,
    mode=instructor.Mode.TOOLS
)

# Advanced inference configuration
user = client.create(
    modelId="anthropic.claude-3-5-sonnet-20241022-v2:0",
    messages=[{"role": "user", "content": "Extract user info"}],
    response_model=User,
    inferenceConfig={
        "maxTokens": 2048,
        "temperature": 0.1,
        "topP": 0.9,
        "stopSequences": ["STOP"]
    }
)
Link last verified June 17, 2026. View original ↗
Source: Instructor Docs
Link last verified: 2026-03-04