Anthropic — Claude Models API provides programmatic access to the Claude family of large language models through a RESTful Messages API. Developers can integrate Opus 4.1, Sonnet 4, and Haiku 3.5 into applications with support for conversational interactions, tool use, vision inputs, extended thinking, and up to 1M-token context windows. Models are available directly and through managed deployments on AWS Bedrock, Google Vertex AI, and Microsoft Foundry.

The platform serves coding agents, customer-support automation, document processing, and retrieval-augmented generation workflows. Advanced capabilities include prompt caching for cost reduction, batch processing with 50% savings, Claude Managed Agents for composable agent workflows, MCP connector integration, code execution, and structured JSON outputs.