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    Model cards

    Claude Opus 4.6 System Card

    Detailed documentation of Claude Opus 4.6.

    Claude Sonnet 4.6 System Card

    Detailed documentation of Claude Sonnet 4.6.

    Claude Opus 4.5 System Card

    Detailed documentation of Claude Opus 4.5.

    Claude Haiku 4.5 System Card

    Detailed documentation of Claude Haiku 4.5.

    Claude Sonnet 4.5 System Card

    Detailed documentation of Claude Sonnet 4.5.

    Claude Opus 4.1 System Card

    Detailed documentation of Claude Opus 4.1.

    Claude 4 System Card

    Detailed documentation of Claude 4 models.

    Claude Sonnet 3.7 System Card

    System card for Claude Sonnet 3.7 with performance and safety details.

    Claude 3 Model Card

    Detailed documentation of Claude 3 models including latest 3.5 addendum.

    Learning resources

    Quickstarts

    Deployable applications built with the API.

    Courses

    Step by step lessons on building with Claude.

    Cookbook

    Replicable code samples and implementations.

    Use case guides

    In-depth production guides for building common use cases with Claude.

    Glossary

    Key terms and concepts for working with Claude and language models.

    Resources for AI ingestion

    API primer for Claude ingestion

    Concise API guide meant for ingestion by Claude.

    Claude API Docs Overview

    Concise overview of Claude API documentation, optimized for LLM ingestion.

    llms.txt

    LLM-optimized documentation index.

    llms-full.txt

    Complete LLM-optimized documentation.