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# title: Documentation url: https://platform.claude.com/docs/en/home description: Claude API Documentation

Quickstart 
<HomeQuickChip icon="Key" href="https://platform.claude.com/settings/keys">
  Get API key
</HomeQuickChip>

<HomeQuickChip icon="CodeBrackets" href="https://platform.claude.com/docs/en/api/overview">
  API reference
</HomeQuickChip>

<HomePlatformCards>
  <HomePlatformCard title="Messages" description="Direct model access. You construct every turn, manage conversation state, and write your own tool loop." pictogram="code-terminal">
    <HomeCardLink icon="play" href="https://platform.claude.com/docs/en/get-started">
      Quickstart
    </HomeCardLink>

    <HomeCardLink icon="book" href="https://platform.claude.com/docs/en/api/messages/create">
      API reference
    </HomeCardLink>

    <HomeCardLink icon="code-brackets" href="https://platform.claude.com/docs/en/cli-sdks-libraries/overview">
      Client SDKs
    </HomeCardLink>
  </HomePlatformCard>

  <HomePlatformCard title="Managed Agents" description="Fully managed agent infrastructure. Deploy and manage autonomous agents in stateful sessions with persistent event history." pictogram="clouds">
    <HomeCardLink icon="play" href="https://platform.claude.com/docs/en/managed-agents/quickstart">
      Quickstart
    </HomeCardLink>

    <HomeCardLink icon="book" href="https://platform.claude.com/docs/en/api/beta/sessions">
      API reference
    </HomeCardLink>

    <HomeCardLink icon="brain" href="https://platform.claude.com/docs/en/managed-agents/agent-setup">
      Define your agent
    </HomeCardLink>
  </HomePlatformCard>
</HomePlatformCards>

<HomePartnerLinks label="Claude is also available on these cloud platforms:">
  <HomeCloudPartnerLink icon="cloud" href="https://platform.claude.com/docs/en/build-with-claude/claude-in-amazon-bedrock">
    Amazon Bedrock
  </HomeCloudPartnerLink>

  <HomeCloudPartnerLink icon="cloud" href="https://platform.claude.com/docs/en/build-with-claude/claude-on-vertex-ai">
    Google Cloud
  </HomeCloudPartnerLink>

  <HomeCloudPartnerLink icon="cloud" href="https://platform.claude.com/docs/en/build-with-claude/claude-in-microsoft-foundry">
    Microsoft Foundry
  </HomeCloudPartnerLink>
</HomePartnerLinks>

<HomeJourney>
  <HomeJourneyTab label="Messages">
    <HomeJourneyStep title="Get started">
      <HomeJourneyLink icon="play" href="https://platform.claude.com/docs/en/get-started">
        Quickstart
      </HomeJourneyLink>

      <HomeJourneyLink icon="lock" href="https://platform.claude.com/settings/keys">
        Get API key
      </HomeJourneyLink>

      <HomeJourneyLink icon="settings" href="https://platform.claude.com/docs/en/models/overview">
        Choose a model
      </HomeJourneyLink>

      <HomeJourneyLink icon="code-brackets" href="https://platform.claude.com/docs/en/cli-sdks-libraries/overview">
        Install an SDK
      </HomeJourneyLink>

      <HomeJourneyLink icon="message" href="https://platform.claude.com/playground">
        Try the API in playground
      </HomeJourneyLink>
    </HomeJourneyStep>

    <HomeJourneyStep title="Build">
      <HomeJourneyLink icon="message" href="https://platform.claude.com/docs/en/api/messages/create">
        Messages API
      </HomeJourneyLink>

      <HomeJourneyLink icon="brain" href="https://platform.claude.com/docs/en/build-with-claude/thinking">
        Thinking
      </HomeJourneyLink>

      <HomeJourneyLink icon="image" href="https://platform.claude.com/docs/en/build-with-claude/vision">
        Vision
      </HomeJourneyLink>

      <HomeJourneyLink icon="tool" href="https://platform.claude.com/docs/en/agents-and-tools/tool-use/overview">
        Tool use
      </HomeJourneyLink>

      <HomeJourneyLink icon="compass" href="https://platform.claude.com/docs/en/agents-and-tools/tool-use/web-search-tool">
        Web search
      </HomeJourneyLink>

      <HomeJourneyLink icon="code" href="https://platform.claude.com/docs/en/agents-and-tools/tool-use/code-execution-tool">
        Code execution
      </HomeJourneyLink>

      <HomeJourneyLink icon="database" href="https://platform.claude.com/docs/en/build-with-claude/structured-outputs">
        Structured outputs
      </HomeJourneyLink>

      <HomeJourneyLink icon="lightning" href="https://platform.claude.com/docs/en/build-with-claude/prompt-caching">
        Prompt caching
      </HomeJourneyLink>

      <HomeJourneyLink icon="wifi-high" href="https://platform.claude.com/docs/en/build-with-claude/streaming">
        Streaming
      </HomeJourneyLink>
    </HomeJourneyStep>

    <HomeJourneyStep title="Evaluate and ship">
      <HomeJourneyLink icon="lightbulb" href="https://platform.claude.com/docs/en/build-with-claude/prompt-engineering/overview">
        Prompting best practices
      </HomeJourneyLink>

      <HomeJourneyLink icon="chart" href="https://platform.claude.com/docs/en/test-and-evaluate/develop-tests">
        Run evals
      </HomeJourneyLink>

      <HomeJourneyLink icon="stack" href="https://platform.claude.com/docs/en/build-with-claude/batch-processing">
        Batch testing
      </HomeJourneyLink>

      <HomeJourneyLink icon="verified" href="https://platform.claude.com/docs/en/test-and-evaluate/strengthen-guardrails/increase-consistency">
        Safety and guardrails
      </HomeJourneyLink>

      <HomeJourneyLink icon="bolt" href="https://platform.claude.com/docs/en/api/rate-limits">
        Rate limits and errors
      </HomeJourneyLink>

      <HomeJourneyLink icon="calculator" href="https://platform.claude.com/docs/en/about-claude/pricing">
        Cost optimization
      </HomeJourneyLink>
    </HomeJourneyStep>

    <HomeJourneyStep title="Operate">
      <HomeJourneyLink icon="settings" href="https://platform.claude.com/docs/en/build-with-claude/workspaces">
        Workspaces and admin
      </HomeJourneyLink>

      <HomeJourneyLink icon="lock" href="https://platform.claude.com/settings/keys">
        API key management
      </HomeJourneyLink>

      <HomeJourneyLink icon="chart" href="https://platform.claude.com/docs/en/build-with-claude/usage-cost-api">
        Usage monitoring
      </HomeJourneyLink>

      <HomeJourneyLink icon="settings" href="https://platform.claude.com/docs/en/about-claude/models/migration-guide">
        Model migration
      </HomeJourneyLink>
    </HomeJourneyStep>
  </HomeJourneyTab>

  <HomeJourneyTab label="Managed Agents">
    <HomeJourneyStep title="Get started">
      <HomeJourneyLink icon="play" href="https://platform.claude.com/docs/en/managed-agents/quickstart">
        Quickstart
      </HomeJourneyLink>

      <HomeJourneyLink icon="lock" href="https://platform.claude.com/settings/keys">
        Get API key
      </HomeJourneyLink>

      <HomeJourneyLink icon="message" href="https://platform.claude.com/docs/en/managed-agents/onboarding">
        Build in Console
      </HomeJourneyLink>
    </HomeJourneyStep>

    <HomeJourneyStep title="Define your agent">
      <HomeJourneyLink icon="brain" href="https://platform.claude.com/docs/en/managed-agents/agent-setup">
        Agent setup
      </HomeJourneyLink>

      <HomeJourneyLink icon="tool" href="https://platform.claude.com/docs/en/managed-agents/tools">
        Tools
      </HomeJourneyLink>

      <HomeJourneyLink icon="lock" href="https://platform.claude.com/docs/en/managed-agents/permission-policies">
        Tool permissions
      </HomeJourneyLink>
    </HomeJourneyStep>

    <HomeJourneyStep title="Run sessions">
      <HomeJourneyLink icon="wifi-high" href="https://platform.claude.com/docs/en/managed-agents/events-and-streaming">
        Streaming and events
      </HomeJourneyLink>

      <HomeJourneyLink icon="code-brackets" href="https://platform.claude.com/docs/en/api/beta/sessions">
        Sessions API reference
      </HomeJourneyLink>
    </HomeJourneyStep>

    <HomeJourneyStep title="Operate">
      <HomeJourneyLink icon="settings" href="https://platform.claude.com/docs/en/build-with-claude/workspaces">
        Workspaces and admin
      </HomeJourneyLink>

      <HomeJourneyLink icon="lock" href="https://platform.claude.com/settings/keys">
        API key management
      </HomeJourneyLink>

      <HomeJourneyLink icon="chart" href="https://platform.claude.com/docs/en/build-with-claude/usage-cost-api">
        Usage monitoring
      </HomeJourneyLink>
    </HomeJourneyStep>
  </HomeJourneyTab>
</HomeJourney>

* [Claude Fable 5.1](https://platform.claude.com/docs/en/models/fable-5-1/overview) (`claude-fable-5-1`) — New — *For demanding reasoning and long-horizon agentic work* — Most capable · Research · Multi-day tasks
* [Claude Opus 5](https://platform.claude.com/docs/en/models/opus-5/overview) (`claude-opus-5`) — *For complex agentic coding and enterprise work* — Complex projects · Agents · Coding
* [Claude Sonnet 5](https://platform.claude.com/docs/en/models/sonnet-5/overview) (`claude-sonnet-5`) — *The best combination of speed and intelligence* — Everyday tasks · Writing · Cost-efficient
* [Claude Haiku 4.5](https://platform.claude.com/docs/en/models/haiku-4-5/overview) (`claude-haiku-4-5`) — *The fastest model with near-frontier intelligence* — Fastest · Lowest cost · High volume

<CardGroup cols={3}>
  <Card icon="graduation-cap" title="Courses" href="https://academy.claude.com/courses">
    Interactive courses to master Claude.
  </Card>

  <Card icon="book" title="Cookbook" href="https://platform.claude.com/cookbook">
    Code samples and patterns.
  </Card>

  <Card icon="play" title="Quickstarts" href="https://github.com/anthropics/anthropic-quickstarts">
    Deployable starter apps.
  </Card>

  <Card icon="star" title="What's new" href="https://platform.claude.com/docs/en/release-notes/overview">
    Latest features and updates.
  </Card>

  <Card icon="terminal" title="Claude Code" href="https://code.claude.com/docs">
    An agentic coding assistant in your terminal.
  </Card>
</CardGroup>