Claude API

Product

The API for integrating Anthropic's Claude models into applications and services.

Releases

May 7, 2025Web search tool launched on the Anthropic APIClaude APIAPI release

Anthropic released a web search tool for developers building Claude-powered applications.

Mar 13, 2025Token-saving API updates releasedClaude APIAPI update

Anthropic released API features designed to reduce token use and improve long-running agent workflows.

Sep 19, 2024Contextual Retrieval introducedClaude APIAPI update

Anthropic introduced Contextual Retrieval, combining contextual embeddings and BM25 to improve retrieval-augmented generation.

Aug 14, 2024Prompt caching launched on the Claude APIClaude APIAPI update

Anthropic launched prompt caching to reduce latency and cost for repeated long-context prompts.

May 30, 2024Claude tool use became generally availableClaude APIAPI update

Anthropic made tool use generally available across the Claude API, Amazon Bedrock, and Google Vertex AI.

Dec 19, 2023Anthropic expands API legal protectionsClaude APIAPI update

Anthropic expanded commercial legal protections and improved API access and enterprise terms.

May 11, 2023Claude context window expanded to 100K tokensClaude APIAPI update

Anthropic expanded Claude's API context window from 9K to 100K tokens.

Mar 14, 2023Claude API and developer console launchedClaude APIAPI release

Anthropic made Claude available through an API and chat interface in its developer console.