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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.

QuickstartGet API key in Claude ConsoleAPI reference
Python
import anthropic

client = anthropic.Anthropic()

message = client.messages.create(
    model="claude-opus-5-5",
    max_tokens=1024,
    messages=[
        {
            "role": "user",
            "content": "Hello, Claude",
        }
    ],
)
for block in message.content:
    if block.type == "text":
        print(block.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

Managed Agents

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

QuickstartAPI referenceDefine your agent

Claude is also available on these cloud platforms:

Amazon Bedrock
Google Cloud
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 in Claude Console
    Choose a model
    Install an SDK
    Try the API in Console playground
  2. 2

    Build

    Messages API
    Thinking
    Vision
    Tool use
    Web search
    Code execution
    Structured outputs
    Prompt caching
    Streaming
  3. 3

    Evaluate and ship

    Prompting best practices
    Run evals
    Batch testing
    Safety and guardrails
    Rate limits and errors
    Cost optimization
  4. 4

    Operate

    Workspaces and admin
    API keys in Claude Console
    Usage monitoring
    Model migration
Models

The Claude model family

Choose the right model for your use case.

Fable 5.2

New
Most capableResearchMulti-day tasks

For demanding reasoning and long-horizon agentic work

Opus 5.5

New
Complex projectsAgentsCoding

For long-running agentic coding and knowledge work

Sonnet 5.5

New
Everyday tasksWritingCost-efficient

The best combination of speed and intelligence

Haiku 5.5

New
FastestLowest costHigh volume

For high-volume, latency-sensitive tasks such as classification, extraction, and routing

Resources

Keep learning


Courses

Interactive courses to master Claude.


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.

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