anthropic-api

Use when integrating Claude via the Anthropic API — messages, tool use, vision, streaming, or building AI features. Also use when working with the Anthropic SDK, managing API keys, or optimizing Claude API usage.

Model	Source
sonnet	pack: ai

Full Reference

┏━ 🔧 anthropic-api ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓ ┃ Use when integrating Claude via the Anthropic … ┃ ┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛

Anthropic API

Direct Claude API access via the @anthropic-ai/sdk package. Uses a Messages API with a structured messages array, content blocks, and optional streaming. All models share a 200K token context window (1M beta for Opus/Sonnet 4.6).

Quick Reference

Fact	Value
Install	npm install @anthropic-ai/sdk
Base URL	https://api.anthropic.com/v1
API version header	anthropic-version: 2023-06-01
Env var	ANTHROPIC_API_KEY
Opus 4.6 pricing	$5/MTok input · $25/MTok output · 128K max output
Sonnet 4.6 pricing	$3/MTok input · $15/MTok output · 64K max output
Haiku 4.5 pricing	$1/MTok input · $5/MTok output · 64K max output
Prompt caching	Cache write 1.25x · Cache read 0.1x (90% savings)
Batch API	50% discount · 24hr processing · 100K requests/batch

Reference Index

I want to…	File
Install the SDK and initialize the client	reference/setup.md
Send a message, configure parameters, or build multi-turn conversations	reference/messages.md
Stream responses with async iterator or SSE events	reference/streaming.md
Define tools and run the tool use loop	reference/tool-use.md
Send images or PDFs and understand format limits	reference/vision.md
Use prompt caching or the Batches API for cost savings	reference/prompt-caching.md
Enable extended thinking or Opus adaptive mode	reference/extended-thinking.md
Handle errors, retry with backoff, and understand rate limits	reference/error-handling.md

Usage: Read the reference file matching your current task from the index above. Each file is self-contained with code examples and inline gotchas.