Serverless strategies for streaming LLM responses

This article compares three serverless approaches for streaming Amazon Bedrock LLM responses in real-time on AWS.

• Lambda function URLs with response streaming: Direct HTTP endpoint, lowest complexity, Node.js only
• API Gateway WebSocket APIs: Persistent connections, ideal for multi-turn conversations, requires custom auth
• AWS AppSync GraphQL subscriptions: Fully managed, built-in Cognito support, best for complex applications
• Lambda URLs offer lowest latency and cost for single-user applications but lack native Cognito auth
• WebSocket APIs enable bidirectional communication and connection reuse but require more development
• AppSync provides seamless Cognito integration and automatic subscription management with GraphQL
• All three approaches are serverless, production-ready, and support Amazon Cognito authentication
• Choose based on application complexity, real-time requirements, and existing architecture

The article provides implementation details, code examples, and a comparison table to help select the best streaming strategy for your LLM application.