Welcome#
- Messages
- Managed Agents
- Admin
- Resources
Search
⌘K
First steps
Intro to ClaudeGet your API keyQuickstartAuthentication
Building with Claude
Features overviewUsing the Messages APIStop reasons and fallbackRefusals and fallbackFallback credit
Model capabilities
EffortTask budgets (beta)Fast mode (research preview)Structured outputsCitationsStreaming MessagesBatch processingSearch resultsStreaming refusalsMultilingual supportEmbeddings
Thinking
Tools
OverviewHow tool use worksTutorial: Build a tool-using agentDefine toolsHandle tool callsParallel tool useTool Runner (SDK)Strict tool useServer toolsWeb search toolWeb fetch toolCode execution toolAdvisor toolTool search toolMemory toolBash toolText editor toolComputer use toolTroubleshooting
Tool infrastructure
Tool referenceManage tool contextTool combinationsTool use with prompt cachingProgrammatic tool callingFine-grained tool streaming
Context management
Context windowsCompactionContext editingPrompt cachingMid-conversation system messages and tool changesBuild an orchestration modeCache diagnostics (beta)Token counting
Working with files
Images and vision
Skills
OverviewQuickstartBest practicesSkills for enterpriseSkills in the API
MCP
Remote MCP serversMCP connector
MCP tunnels
Claude on cloud platforms
Amazon Bedrock (Opus 4.7 and later)Amazon Bedrock (Opus 4.6 and earlier)Claude Platform on AWSGoogle CloudMicrosoft Foundry
MessagesIntro to Claude
Loading
Loading
Loading
Loading
Loading
Loading
Loading
Loading
Loading
Loading
Loading
Loading
Loading
Loading
Loading
Loading
Solutions#
- AI agents
- Code modernization
- Coding
- Customer support
- Financial services
- Government
- Higher education
- K-12 teachers
- Life sciences
Partners#
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#
Terms and policies#
- Privacy policy
- Responsible disclosure policy
- Terms of service: Commercial
- Terms of service: Consumer
- Usage policy
Messages/First steps
Intro to Claude#
Copy page
Claude is a highly performant, trustworthy, and intelligent AI platform built by Anthropic. Claude excels at tasks involving language, reasoning, analysis, coding, and more.
Copy page
The latest generation of Claude models:
Claude Fable 5 - Next-generation intelligence for long-running agents. Read the Claude Fable 5 and Claude Mythos 5 announcement.
Claude Mythos 5 - Shares Claude Fable 5's capabilities without the safety classifiers. Available in limited release through Project Glasswing.
Claude Opus 5 - For complex agentic coding and enterprise work. Read the Claude Opus 5 announcement.
Claude Sonnet 5 - Frontier intelligence at scale, built for coding, agents, and enterprise workflows. Read the Claude Sonnet 5 announcement.
Claude Haiku 4.5 - Fastest model with near-frontier intelligence. Read the Claude Haiku 4.5 announcement.
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
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.
- 1
Make your first API call
Set up your environment, install an SDK, and send your first message to Claude.
- 2
Secure your credentials
Set an expiration when you create your API key. Keep the key out of source control, client-side code, and prompts. Check whether your workload can use Workload Identity Federation instead of a static key.
- 3
Understand the Messages API
Learn the core request and response structure, including multi-turn conversations, system prompts, and stop reasons.
- 4
Choose the right model
Compare Claude models by capability and cost to pick the best fit for your use case.
- 5
Explore features and tools
Discover what Claude can do: extended thinking, web search, file handling, structured outputs, and more.
#
Develop with Claude
Anthropic provides developer tools to help you build and scale applications with Claude.
Prototype and test prompts in your browser with the Workbench.
Explore the full Claude API and client SDK documentation.
Learn with interactive Jupyter notebooks covering PDFs, embeddings, and more.
#
Key capabilities
Claude can assist with many tasks that involve text, code, and images.
Summarize text, answer questions, extract data, translate text, and explain and generate code.
Process and analyze visual input and generate text and code from images.
#
Support
Find answers to frequently asked account and billing questions.
Check the status of Anthropic services.
Was this page helpful?
- Recommended path for new developers
- Develop with Claude
- Key capabilities
- Support