> ## Documentation Index
> Fetch the complete documentation index at: https://docs.instructorphp.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Llm anthropic

## Overview

Instructor supports Anthropic API - you can find the details on how to configure
the client in the example below.

Inference feature compatibility:

* Instructor markdown-JSON fallback, native JSON object response\_format - supported
* tool calling - not supported yet

## Example

```php theme={null}
<?php

use Cognesy\Messages\Messages;
use Cognesy\Polyglot\Inference\Inference;
use Cognesy\Utils\Str;

require 'examples/boot.php';

$answer = Inference::using('anthropic')
    // ->withHttpClientPreset('guzzle')
    // ->wiretap(fn($e) => $e->print())
    ->with(
        messages: Messages::fromString('What is the capital of France'),
        options: ['max_tokens' => 128]
    )
    ->withStreaming()
    ->get();

echo "USER: What is capital of France\n";
echo "ASSISTANT: $answer\n";
assert(Str::contains($answer, 'Paris'));
?>
```