citations changedbuild-with-claude/citations
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## Compatibility ## How citations work ### Citable versus non-citable content ### Citation indices ### Token costs ### Feature compatibility #### Using prompt caching with citations ## Document types ### Choosing a document type ### Plain text documents ### PDF documents ### Custom content documents ## Response structure ### Streaming support ## Next steps
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---
title: Citations
url: https://platform.claude.com/docs/en/build-with-claude/citations
description: Ground Claude's responses in your source documents. Citations return the exact passages that support each claim, so you can verify answers and surface sources to your users.
---
## Compatibility
- [ZDR](https://platform.claude.com/docs/en/manage-claude/api-and-data-retention): eligible (excludes [Covered Models](https://platform.claude.com/docs/en/manage-claude/api-and-data-retention#model-specific-data-retention-requirements))
- Platforms: Claude API, Claude Platform on AWS, Amazon Bedrock, Google Cloud, Microsoft Foundry
Claude can provide detailed citations when answering questions about documents, helping you track and verify the sources behind each response.
All [active models](https://platform.claude.com/docs/en/about-claude/models/overview) support citations.
<Tip>
Share your feedback and suggestions about the citations feature using the [citations feedback form](https://forms.gle/9n9hSrKnKe3rpowH9).
</Tip>
The following example shows how to enable citations on a plain text document with the Messages API:
<CodeGroup>
```bash cURL
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-opus-5",
"max_tokens": 1024,
"messages": [
{
"role": "user",
"content": [
{
"type": "document",
"source": {
"type": "text",
"media_type": "text/plain",
"data": "The grass is green. The sky is blue."
},
"title": "My Document",
"context": "This is a trustworthy document.",
"citations": {"enabled": true}
},
{
"type": "text",
"text": "What color is the grass and sky?"
}
]
}
]
}'
```
```bash CLI
ant messages create <<'YAML'
model: claude-opus-5
max_tokens: 1024
messages:
- role: user
content:
- type: document
source:
type: text
media_type: text/plain
data: The grass is green. The sky is blue.
title: My Document
context: This is a trustworthy document.
citations:
enabled: true
- type: text
text: What color is the grass and sky?
YAML
```
```python Python
client = anthropic.Anthropic()
response = client.messages.create(
model="claude-opus-5",
max_tokens=1024,
messages=[
{
"role": "user",
"content": [
{
"type": "document",
"source": {
"type": "text",
"media_type": "text/plain",
"data": "The grass is green. The sky is blue.",
},
"title": "My Document",
"context": "This is a trustworthy document.",
"citations": {"enabled": True},
},
{"type": "text", "text": "What color is the grass and sky?"},
],
}
],
)
print(response)
```
```typescript TypeScript
const client = new Anthropic();
const response = await client.messages.create({
model: "claude-opus-5",
max_tokens: 1024,
messages: [
{
role: "user",
content: [
{
type: "document",
source: {
type: "text",
media_type: "text/plain",
data: "The grass is green. The sky is blue."
},
title: "My Document",
context: "This is a trustworthy document.",
citations: { enabled: true }
},
{
type: "text",
text: "What color is the grass and sky?"
}
]
}
]
});
console.log(response);
```
```csharp C#
var client = new AnthropicClient();
var response = await client.Messages.Create(
new()
{
Model = Model.ClaudeOpus5,
MaxTokens = 1024,
Messages =
[
new()
{
Role = Role.User,
Content = new MessageParamContent(new List<ContentBlockParam>
{
new ContentBlockParam(new DocumentBlockParam(
new DocumentBlockParamSource(new PlainTextSource()
{
Data = "The grass is green. The sky is blue.",
})
)
{
Title = "My Document",
Context = "This is a trustworthy document.",
Citations = new CitationsConfigParam { Enabled = true },
}),
new ContentBlockParam(new TextBlockParam("What color is the grass and sky?")),
}),
},
],
}
);
Console.WriteLine(response);
```
```go Go
client := anthropic.NewClient()
response, err := client.Messages.New(context.TODO(), anthropic.MessageNewParams{
Model: anthropic.ModelClaudeOpus5,
MaxTokens: 1024,
Messages: []anthropic.MessageParam{
anthropic.NewUserMessage(
anthropic.ContentBlockParamUnion{
OfDocument: &anthropic.DocumentBlockParam{
Source: anthropic.DocumentBlockParamSourceUnion{
OfText: &anthropic.PlainTextSourceParam{
Data: "The grass is green. The sky is blue.",
},
},
Title: anthropic.String("My Document"),
Context: anthropic.String("This is a trustworthy document."),
Citations: anthropic.CitationsConfigParam{Enabled: anthropic.Bool(true)},
},
},
anthropic.NewTextBlock("What color is the grass and sky?"),
),
},
})
if err != nil {
log.Fatal(err)
}
fmt.Println(response)
```
```java Java
AnthropicClient client = AnthropicOkHttpClient.fromEnv();
PlainTextSource source = PlainTextSource.builder()
.data("The grass is green. The sky is blue.")
.build();
DocumentBlockParam documentParam = DocumentBlockParam.builder()
.source(source)
.title("My Document")
.context("This is a trustworthy document.")
.citations(CitationsConfigParam.builder().enabled(true).build())
.build();
TextBlockParam textBlockParam = TextBlockParam.builder()
.text("What color is the grass and sky?")
.build();
MessageCreateParams params = MessageCreateParams.builder()
.model(Model.CLAUDE_OPUS_5)
.maxTokens(1024)
.addUserMessageOfBlockParams(
List.of(
ContentBlockParam.ofDocument(documentParam),
ContentBlockParam.ofText(textBlockParam)
)
)
.build();
Message message = client.messages().create(params);
System.out.println(message);
```
```php PHP
$client = new Client();
$response = $client->messages->create(
maxTokens: 1024,
messages: [
[
'role' => 'user',
'content' => [
[
'type' => 'document',
'source' => [
'type' => 'text',
'media_type' => 'text/plain',
'data' => 'The grass is green. The sky is blue.',
],
'title' => 'My Document',
'context' => 'This is a trustworthy document.',
'citations' => ['enabled' => true],
],
[
'type' => 'text',
'text' => 'What color is the grass and sky?',
],
],
],
],
model: 'claude-opus-5',
);
echo json_encode($response, JSON_PRETTY_PRINT);
```
```ruby Ruby
client = Anthropic::Client.new
response = client.messages.create(
model: "claude-opus-5",
max_tokens: 1024,
messages: [
{
role: "user",
content: [
{
type: "document",
source: {
type: "text",
media_type: "text/plain",
data: "The grass is green. The sky is blue."
},
title: "My Document",
context: "This is a trustworthy document.",
citations: { enabled: true }
},
{
type: "text",
text: "What color is the grass and sky?"
}
]
}
]
)
puts response
```
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