Migrate from Anthropic’s Claude 3.5 Sonnet to Claude 4 Sonnet on Amazon Bedrock

This article provides a comprehensive guide for migrating from Anthropic's Claude 3.5 Sonnet to Claude 4 Sonnet on Amazon Bedrock. The migration involves several key considerations:

• Expanded context window from 200,000 to 1 million tokens
• Native reasoning mechanisms like extended and interleaved thinking
• Advanced tool use capabilities with parallel tool execution
• API changes requiring model ID updates and potential Converse API adoption
• Updated tool definitions and new refusal stop reason

Key migration best practices include:

• Robust model evaluation using custom benchmark datasets
• Implementing safe deployment strategies like canary or blue/green releases
• Carefully testing safety and governance configurations
• Strategically using extended thinking for complex reasoning tasks

The article emphasizes treating the migration as a structured engineering project to minimize risks and unlock next-generation AI capabilities.