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Model cards

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Claude Opus 4.8 System Card
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Detailed documentation of Claude Opus 4.8.

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Claude Opus 4.7 System Card
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Detailed documentation of Claude Opus 4.7.

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Claude Sonnet 4.6 System Card
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Detailed documentation of Claude Sonnet 4.6.

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Claude Opus 4.5 System Card
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Detailed documentation of Claude Opus 4.5.

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Claude Haiku 4.5 System Card
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Detailed documentation of Claude Haiku 4.5.

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Claude Sonnet 4.5 System Card
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Detailed documentation of Claude Sonnet 4.5.

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Claude Opus 4.1 System Card
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Detailed documentation of Claude Opus 4.1.

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Claude 4 System Card
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Detailed documentation of Claude 4 models.

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

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Claude 3 Model Card
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Detailed documentation of Claude 3 models including latest 3.5 addendum.

Learning resources

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Quickstarts
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Deployable applications built with the API.

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Courses
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Step by step lessons on building with Claude.

Cookbook
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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

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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.

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llms.txt

LLM-optimized documentation index.