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    First steps
    Intro to ClaudeQuickstart
    Building with Claude
    Features overviewUsing the Messages APIHandling stop reasons
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    Extended thinkingAdaptive thinkingEffortFast mode (beta: research preview)Structured outputsCitationsStreaming MessagesBatch processingSearch resultsStreaming refusalsMultilingual supportEmbeddings
    Tools
    OverviewHow tool use worksWeb search toolWeb fetch toolCode execution toolMemory toolBash toolComputer use toolText editor tool
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    Claude Platform

    Start building
    with Claude

    Everything you need to integrate Claude into your applications. From first API call to production.

    What do you want to build?
    ⌘K
    Quickstart
    Get API key
    API reference
    import anthropic

client = anthropic.Anthropic()

message = client.messages.create(
  model="claude-sonnet-4-6",
  max_tokens=1024,
  messages=[{
    "role": "user",
    "content": "Hello, Claude"
  }]
)
print(message.content[0].text)
    Platform

    Choose how you build

    Pick the developer surface that matches your approach, and the infrastructure that fits your stack.

    Messages

    Direct model access. You construct every turn, manage conversation state, and write your own tool loop.

    Quickstart
    API reference
    Client SDKs

    Claude Managed Agents

    Fully managed agent infrastructure. Deploy and manage autonomous agents in stateful sessions with persistent event history.

    Quickstart
    API reference
    Define your agent
    AWS Bedrock
    Google Cloud Vertex AI
    Microsoft Foundry
    Developer journey

    From idea to production

    Follow the lifecycle or jump to what you need.

    1. 1

      Get started

      Quickstart
      Get API key
      Choose a model
      Install an SDK
      Try the Workbench
    2. 2

      Build

      Messages API
      Extended thinking
      Vision
      Tool use
      Web search
      Code execution
      Structured outputs
      Prompt caching
      Streaming
    3. 3

      Evaluate & ship

      Prompting best practices
      Run evals
      Batch testing
      Safety & guardrails
      Rate limits & errors
      Cost optimization
    4. 4

      Operate

      Workspaces & admin
      API key management
      Usage monitoring
      Model migration
    Models

    The Claude model family

    Choose the right model for your use case.

    Most capable
    Opus 4.6

    Best for complex analysis, coding, and creative tasks requiring deep reasoning.

    Best balance
    Sonnet 4.6

    Ideal balance of intelligence and speed for most production workloads.

    Fastest
    Haiku 4.5

    Lightning-fast responses for high-volume, latency-sensitive applications.

    Resources

    Keep learning

    Courses
    Interactive courses to master Claude.
    Cookbook
    Code samples and patterns.
    Quickstarts
    Deployable starter apps.
    What's new
    Latest features and updates.
    Claude Code
    An agentic coding assistant in your terminal.