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URL: https://platform.claude.com/docs/en/intro

Intro to Claude

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The latest generation of Claude models:

Claude Fable 5 - Anthropic's most capable widely released model for the most demanding reasoning and long-horizon agentic work. Read the Claude Fable 5 announcement.

Claude Mythos 5 - Shares Claude Fable 5's capabilities without the safety classifiers. Available in limited release through Project Glasswing.

Claude Opus 4.8 - Anthropic's most capable Opus-tier model for complex reasoning and agentic coding. Read the Claude Opus 4.8 announcement.

Claude Sonnet 4.6 - Frontier intelligence at scale, built for coding, agents, and enterprise workflows. Read the Claude Sonnet 4.6 announcement.

Claude Haiku 4.5 - Fastest model with near-frontier intelligence. Read the Claude Haiku 4.5 announcement.

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Looking to chat with Claude? Visit claude.ai.

Anthropic offers two ways to build with Claude, each suited to different use cases:

	Messages API	Claude Managed Agents
What it is	Direct model prompting access	Pre-built, configurable agent harness that runs in managed infrastructure

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Best for

Custom agent loops and fine-grained control

Long-running tasks and asynchronous work

Learn more

Messages API docs

Claude Managed Agents docs

Recommended path for new developers

Follow these steps to go from zero to a working Claude integration.

Make your first API call
Set up your environment, install an SDK, and send your first message to Claude.
Go to the quickstart
Understand the Messages API
Learn the core request and response structure, including multi-turn conversations, system prompts, and stop reasons.
Read the Messages API guide
Choose the right model
Compare Claude models by capability and cost to pick the best fit for your use case.
See the models overview
Explore features and tools
Discover what Claude can do: extended thinking, web search, file handling, structured outputs, and more.
Browse the features overview