Start building with Claude
Everything you need to integrate Claude into your applications. From first API call to production.
import anthropic
client = anthropic.Anthropic()
message = client.messages.create(
model="claude-opus-5",
max_tokens=1024,
messages=[{
"role": "user",
"content": "Hello, Claude"
}]
)
for block in message.content:
if block.type == "text":
print(block.text)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.
Managed Agents
Fully managed agent infrastructure. Deploy and manage autonomous agents in stateful sessions with persistent event history.
Claude is also available on these cloud platforms:
From idea to production
Follow the lifecycle or jump to what you need.
The Claude model family
Choose the right model for your use case.
Fable 5.1
NewFor demanding reasoning and long-horizon agentic work
Keep learning
Interactive courses to master Claude.
Code samples and patterns.
Deployable starter apps.
Latest features and updates.
An agentic coding assistant in your terminal.