Monday, June 29, 2026

AWS AI Professional - When to use which AWS Lex vs AWS Bedrock Agents

 QBased on everything you've covered in both parts of your blog, here's a comprehensive summary that captures both the **fundamentals** and the **AI-specific capabilities** of OpenTelemetry.


Exam Decision Table

Requirement Choose Reason

Intent-based chatbot Amazon Lex Purpose-built for conversational workflows

Multi-turn slot filling Amazon Lex Native dialog management

Retrieve order status AWS Lambda Calls enterprise systems securely

Generate natural explanations Amazon Bedrock LLM reasoning and text generation

Summarize conversations Amazon Bedrock LLM summarization

Execute business logic AWS Lambda Orchestration and integration

Build a customer support bot with both transactional and generative capabilities Lex + Lambda + Bedrock Best of both worlds

An exam tip


A useful way to think about these services is:


Amazon Lex = How do I conduct the conversation? (intents, slots, dialog flow)

AWS Lambda = How do I retrieve or update enterprise data?

Amazon Bedrock = How do I reason over information or generate natural language?


If a scenario emphasizes structured conversations, slot filling, and predictable workflows, Lex is usually the stronger choice. If it emphasizes open-ended questions, summarization, content generation, or reasoning, Bedrock becomes the key service. Many real-world AWS architectures combine all three.

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