Models

This page is the single source of truth for LLM model identifiers used throughout the course. Every project page links here rather than embedding a model ID directly.

Canonical Model

Field	Value
Model	Claude Sonnet 4.5
Provider	Anthropic via Amazon Bedrock
Deployment	Cross-Region Inference Profile
Model ID	us.anthropic.claude-sonnet-4-5-20250514-v1:0
Profile ARN pattern	arn:aws:bedrock:{region}:{account-id}:inference-profile/us.anthropic.claude-sonnet-4-5-20250514-v1:0

Cross-Region Inference Profile

A Cross-Region Inference Profile routes Bedrock requests across multiple AWS regions transparently. This improves availability and reduces throttling during peak usage without requiring application-level retry logic.

When you invoke the model, you call the inference profile ARN rather than the base model ARN. Bedrock handles region selection behind the scenes.

Setting up the profile

1. Open the Amazon Bedrock console in your primary region (e.g., us-east-1).

2. Navigate to Cross-region inference in the left sidebar.

3. Locate the Claude Sonnet 4.5 profile and note its ARN.

Use this ARN in your Lambda function's model_id parameter and in any CDK or SAM configuration that references the model.

Example: invoking the model in Python 3.12

import boto3
import json

bedrock = boto3.client("bedrock-runtime")

response = bedrock.invoke_model(
    modelId="us.anthropic.claude-sonnet-4-5-20250514-v1:0",
    contentType="application/json",
    accept="application/json",
    body=json.dumps({
        "anthropic_version": "bedrock-2023-05-31",
        "max_tokens": 1024,
        "messages": [
            {"role": "user", "content": "Summarize the quarterly results."}
        ]
    })
)

Updating the canonical model

When the course adopts a newer model, update only this page. All other pages link here, so a single edit propagates the change across the course.

1. Update the table above with the new model ID, ARN pattern, and name.

2. Update the Python example to reflect the new modelId value.

3. Run the grep-gate to confirm no other page embeds the old or new ID directly.

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Last verified: 2026-06