Claude API

Claude API

Access advanced conversational AI models via the Claude API.

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Latest Release
Claude Haiku 4.5
Claude Haiku 4.5New

Anthropic released Claude Haiku 4.5, the small/fast tier of the Claude 4 family.

Claude API · Official · Oct 15, 2025

About Claude API

The Claude API by Anthropic provides developers with programmatic access to Claude's advanced AI models, enabling integration of natural language understanding, generation, and conversational capabilities into applications and workflows. It is suitable for businesses, researchers, and developers looking to leverage cutting-edge AI for a variety of use cases including chatbots, content creation, coding assistance, customer support, and more. Robust API documentation and ecosystem support facilitate quick development and deployment.

Releases

Claude Haiku 4.5Oct 2025

Anthropic released Claude Haiku 4.5, the small/fast tier of the Claude 4 family.

Claude Sonnet 4.5Sep 2025

Claude Sonnet 4.5: mid-tier Anthropic model, stronger at coding and agentic tool use.

Claude Opus 4May 2025

Anthropic released Claude Opus 4 alongside Sonnet 4, marking the start of the Claude 4 family.

Pricing Plans
Pay-as-you-go
Varies (per usage/model)

Resources

API Documentation

Comprehensive guides and reference material for using the Claude API effectively.

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Blog

Insights and updates on the Claude API, including use cases and best practices.

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Pricing

Details on the pricing structure for using the Claude API.

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