Claude API

Claude API

Advanced AI model API access for enterprise and developers.

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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

Claude API provides secure, scalable programmatic access to the family of Claude large language models from Anthropic. It is designed for developers and organizations that want to integrate cutting-edge generative AI for tasks like content creation, summarization, coding assistance, and knowledge work into their applications or workflows. The Claude API offers multiple model options tailored to different speed, cost, and performance needs, through a reliable and compliant cloud platform.

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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