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PL/B Language Development and Support

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Documentation - Claude Platform Docs

Claude Platform Docs

Messages
Managed Agents
Admin

Claude Platform Docs

Solutions

AI agents
Code modernization
Coding
Customer support
Education
Financial services
Government
Life sciences

Partners

Claude on AWS
Claude on Google Cloud

Learn

Blog
Courses
Use cases
Connectors
Customer stories
Engineering at Anthropic
Events
Powered by Claude
Service partners
Startups program

Company

Anthropic
Careers
Economic Futures
Research
News
Responsible Scaling Policy
Security and compliance
Transparency

Learn

Blog
Courses
Use cases
Connectors
Customer stories
Engineering at Anthropic
Events
Powered by Claude
Service partners
Startups program

Help and security

Availability
Status
Support
Discord

Terms and policies

Privacy policy
Responsible disclosure policy
Terms of service: Commercial
Terms of service: Consumer
Usage policy

Claude Platform Docs

Messages
Managed Agents
Admin

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-opus-4-8",
  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

Managed Agents

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

QuickstartAPI referenceDefine your agent

Amazon BedrockGoogle CloudMicrosoft Foundry

Developer journey

From idea to production

Follow the lifecycle or jump to what you need.

Get started
Quickstart Get API key Choose a model Install an SDK Try the Workbench
Build
Messages API Extended thinking Vision Tool use Web search Code execution Structured outputs Prompt caching Streaming
Evaluate and ship
Prompting best practices Run evals Batch testing Safety and guardrails Rate limits and errors Cost optimization
Operate
Workspaces and admin API key management Usage monitoring Model migration

Models

The Claude model family

Choose the right model for your use case.

Most capable

Fable 5

Highest capability for the most demanding reasoning and long-horizon agentic work.

Advanced

Opus 4.8

Excellent 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.

Claude Platform Docs

Solutions

AI agents
Code modernization
Coding
Customer support
Education
Financial services
Government
Life sciences

Partners

Claude on AWS
Claude on Google Cloud

Learn

Blog
Courses
Use cases
Connectors
Customer stories
Engineering at Anthropic
Events
Powered by Claude
Service partners
Startups program

Company

Anthropic
Careers
Economic Futures
Research
News
Responsible Scaling Policy
Security and compliance
Transparency

Learn

Blog
Courses
Use cases
Connectors
Customer stories
Engineering at Anthropic
Events
Powered by Claude
Service partners
Startups program

Help and security

Availability
Status
Support
Discord

Terms and policies

Privacy policy
Responsible disclosure policy
Terms of service: Commercial
Terms of service: Consumer
Usage policy

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-opus-4-8",
  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

Managed Agents

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

QuickstartAPI referenceDefine your agent

Amazon BedrockGoogle CloudMicrosoft Foundry

Developer journey

From idea to production

Follow the lifecycle or jump to what you need.

Get started
Quickstart Get API key Choose a model Install an SDK Try the Workbench
Build
Messages API Extended thinking Vision Tool use Web search Code execution Structured outputs Prompt caching Streaming
Evaluate and ship
Prompting best practices Run evals Batch testing Safety and guardrails Rate limits and errors Cost optimization
Operate
Workspaces and admin API key management Usage monitoring Model migration