03-streaming-responses

Streaming Claude Responses in Go

Video #03 — Claude API in Go Series
Publish date: 2026-06-15
Type: Lightweight
Est. duration: ~15 min

What we cover

• Why streaming matters for user-facing Go applications
• Using client.Messages.NewStreaming() and the stream.Next() event loop
• Handling ContentBlockDeltaEventDelta to print tokens as they arrive
• Using message.Accumulate() to build the full response for history
• Streaming inside a multi-turn conversation with message.ToParam()

Prerequisites

• Go 1.23+
• An Anthropic API key
• Familiarity with episodes 01–02 (single-turn completions and system prompts)

Running the example

cd 03-streaming-responses
export ANTHROPIC_API_KEY=your_key_here
go run main.go

Project structure

.
├── README.md
├── go.mod
├── go.sum
└── main.go