Anthropic Claude

Anthropic Claude Messages API

REST API for sending messages to Claude models with support for streaming, tool use, vision, system prompts, prompt caching, and extended thinking. Authentication uses an x-api-key header with an anthropic-version header.

GitHub OpenAPI

Documentation

📖
Documentation
https://docs.anthropic.com/en/api/messages

Specifications

⚙
OpenAPI
https://raw.githubusercontent.com/api-evangelist/anthropic-claude/refs/heads/main/openapi/anthropic-claude-openapi.yml

Other Resources

🔗
API Reference
https://docs.anthropic.com/en/api/getting-started
🔗
Getting Started
https://docs.anthropic.com/en/api/getting-started

API entry from apis.yml

apis.yml Raw ↑ 
aid: anthropic-claude:messages-api
name: Anthropic Claude Messages API
description: REST API for sending messages to Claude models with support for streaming, tool use, vision,
  system prompts, prompt caching, and extended thinking. Authentication uses an x-api-key header with
  an anthropic-version header.
humanURL: https://docs.anthropic.com/en/api/messages
baseURL: https://api.anthropic.com
tags:
- Messages
- Chat
- Completions
- Tool Use
- Vision
- Streaming
properties:
- type: Documentation
  url: https://docs.anthropic.com/en/api/messages
- type: API Reference
  url: https://docs.anthropic.com/en/api/getting-started
- type: OpenAPI
  url: openapi/anthropic-claude-openapi.yml
- type: Getting Started
  url: https://docs.anthropic.com/en/api/getting-started