anthropics-claude-api/php/claude-api/streaming.md

Streaming - PHP

Streaming

Requires SDK v0.5.0+. v0.4.0 and earlier used a single $params array; calling with named parameters throws Unknown named parameter $model. Upgrade: composer require "anthropic-ai/sdk:^0.7"

use Anthropic\Messages\RawContentBlockDeltaEvent;
use Anthropic\Messages\TextDelta;

$stream = $client->messages->createStream(
    model: 'claude-opus-5-5',
    maxTokens: 64000,
    messages: [
        ['role' => 'user', 'content' => 'Write a haiku'],
    ],
);

foreach ($stream as $event) {
    if ($event instanceof RawContentBlockDeltaEvent && $event->delta instanceof TextDelta) {
        echo $event->delta->text;
    }
}