Get Started
Prerequisites
- An Anthropic Console account
- An API key
Call the API
1
Set your API key
Get your API key at the Claude Console and set it as an environment variable:
bash
export ANTHROPIC_API_KEY='your-api-key-here'
2
Make your first API call
Run this command to create a simple web search assistant:
bash
curl https://api.anthropic.com/v1/messages \
-H "Content-Type: application/json" \
-H "x-api-key: $ANTHROPIC_API_KEY" \
-H "anthropic-version: 2023-06-01" \
-d '{
"model": "claude-sonnet-4-5",
"max_tokens": 1000,
"messages": [
{
"role": "user",
"content": "What should I search for to find the latest developments in renewable energy?"
}
]
}'
Example output:
json
{
"id": "msg_01HCDu5LRGeP2o7s2xGmxyx8",
"type": "message",
"role": "assistant",
"content": [
{
"type": "text",
"text": "Here are some effective search strategies to find the latest renewable energy developments:\n\n## Search Terms to Use:\n- \"renewable energy news 2024\"\n- \"clean energy breakthrough\"\n- \"solar/wind/battery technology advances\"\n- \"green energy innovations\"\n- \"climate tech developments\"\n- \"energy storage solutions\"\n\n## Best Sources to Check:\n\n**News & Industry Sites:**\n- Renewable Energy World\n- GreenTech Media (now Wood Mackenzie)\n- Energy Storage News\n- CleanTechnica\n- PV Magazine (for solar)\n- WindPower Engineering & Development..."
}
],
"model": "claude-sonnet-4-5",
"stop_reason": "end_turn",
"usage": {
"input_tokens": 21,
"output_tokens": 305
}
}
1
Set your API key
Get your API key from the Claude Console and set it as an environment variable:
bash
export ANTHROPIC_API_KEY='your-api-key-here'
2
Install the SDK
Install the Anthropic Python SDK:
bash
pip install anthropic
3
Create your code
Save this as quickstart.py:
python
import anthropic
client = anthropic.Anthropic()
message = client.messages.create(
model="claude-sonnet-4-5",
max_tokens=1000,
messages=[
{
"role": "user",
"content": "What should I search for to find the latest developments in renewable energy?"
}
]
)
print(message.content)
4
Run your code
bash
python quickstart.py
Example output:
python
[TextBlock(text='Here are some effective search strategies for finding the latest renewable energy developments:\n\n**Search Terms to Use:**\n- "renewable energy news 2024"\n- "clean energy breakthroughs"\n- "solar/wind/battery technology advances"\n- "energy storage innovations"\n- "green hydrogen developments"\n- "renewable energy policy updates"\n\n**Reliable Sources to Check:**\n- **News & Analysis:** Reuters Energy, Bloomberg New Energy Finance, Greentech Media, Energy Storage News\n- **Industry Publications:** Renewable Energy World, PV Magazine, Wind Power Engineering\n- **Research Organizations:** International Energy Agency (IEA), National Renewable Energy Laboratory (NREL)\n- **Government Sources:** Department of Energy websites, EPA clean energy updates\n\n**Specific Topics to Explore:**\n- Perovskite and next-gen solar cells\n- Offshore wind expansion\n- Grid-scale battery storage\n- Green hydrogen production\n- Carbon capture technologies\n- Smart grid innovations\n- Energy policy changes and incentives...', type='text')]
1
Set your API key
Get your API key from the Claude Console and set it as an environment variable:
bash
export ANTHROPIC_API_KEY='your-api-key-here'
2
Install the SDK
Install the Anthropic TypeScript SDK:
bash
npm install @anthropic-ai/sdk
3
Create your code
Save this as quickstart.ts:
typescript
import Anthropic from "@anthropic-ai/sdk";
async function main() {
const anthropic = new Anthropic();
const msg = await anthropic.messages.create({
model: "claude-sonnet-4-5",
max_tokens: 1000,
messages: [
{
role: "user",
content: "What should I search for to find the latest developments in renewable energy?"
}
]
});
console.log(msg);
}
main().catch(console.error);
4
Run your code
bash
npx tsx quickstart.ts
Example output:
javascript
{
id: 'msg_01ThFHzad6Bh4TpQ6cHux9t8',
type: 'message',
role: 'assistant',
model: 'claude-sonnet-4-5-20250929',
content: [
{
type: 'text',
text: 'Here are some effective search strategies to find the latest renewable energy developments:\n\n' +
'## Search Terms to Use:\n' +
'- "renewable energy news 2024"\n' +
'- "clean energy breakthroughs"\n' +
'- "solar wind technology advances"\n' +
'- "energy storage innovations"\n' +
'- "green hydrogen developments"\n' +
'- "offshore wind projects"\n' +
'- "battery technology renewable"\n\n' +
'## Best Sources to Check:\n\n' +
'**News & Industry Sites:**\n' +
'- Renewable Energy World\n' +
'- CleanTechnica\n' +
'- GreenTech Media (now Wood Mackenzie)\n' +
'- Energy Storage News\n' +
'- PV Magazine (for solar)...'
}
],
stop_reason: 'end_turn',
usage: {
input_tokens: 21,
output_tokens: 302
}
}
1
Set your API key
Get your API key from the Claude Console and set it as an environment variable:
bash
export ANTHROPIC_API_KEY='your-api-key-here'
2
Install the SDK
Add the Anthropic Java SDK to your project. First find the current version on Maven Central.
Gradle:
gradle
implementation("com.anthropic:anthropic-java:1.0.0")
Maven:
xml
<dependency>
<groupId>com.anthropic</groupId>
<artifactId>anthropic-java</artifactId>
<version>1.0.0</version>
</dependency>
3
Create your code
Save this as QuickStart.java:
java
import com.anthropic.client.AnthropicClient;
import com.anthropic.client.okhttp.AnthropicOkHttpClient;
import com.anthropic.models.messages.Message;
import com.anthropic.models.messages.MessageCreateParams;
public class QuickStart {
public static void main(String[] args) {
AnthropicClient client = AnthropicOkHttpClient.fromEnv();
MessageCreateParams params = MessageCreateParams.builder()
.model("claude-sonnet-4-5-20250929")
.maxTokens(1000)
.addUserMessage("What should I search for to find the latest developments in renewable energy?")
.build();
Message message = client.messages().create(params);
System.out.println(message.content());
}
}
4
Run your code
bash
javac QuickStart.java
java QuickStart
Example output:
java
[ContentBlock{text=TextBlock{text=Here are some effective search strategies to find the latest renewable energy developments:
## Search Terms to Use:
- "renewable energy news 2024"
- "clean energy breakthroughs"
- "solar/wind/battery technology advances"
- "energy storage innovations"
- "green hydrogen developments"
- "renewable energy policy updates"
## Best Sources to Check:
- **News & Analysis:** Reuters Energy, Bloomberg New Energy Finance, Greentech Media
- **Industry Publications:** Renewable Energy World, PV Magazine, Wind Power Engineering
- **Research Organizations:** International Energy Agency (IEA), National Renewable Energy Laboratory (NREL)
- **Government Sources:** Department of Energy websites, EPA clean energy updates
## Specific Topics to Explore:
- Perovskite and next-gen solar cells
- Offshore wind expansion
- Grid-scale battery storage
- Green hydrogen production..., type=text}}]
Next steps
Now that you have made your first Claude API request, it's time to explore what else is possible:
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