diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 6db19b9..463488b 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.17.0"
+  ".": "0.17.1"
 }
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5a37899..65fa492 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog
 
+## 0.17.1 (2026-05-12)
+
+Full Changelog: [v0.17.0...v0.17.1](https://github.com/moderation-api/sdk-php/compare/v0.17.0...v0.17.1)
+
+### Bug Fixes
+
+* guzzle requires special handling to enable streaming ([b1aa461](https://github.com/moderation-api/sdk-php/commit/b1aa46133e842c3d12f3bb202a11e7cd8eb0ffa3))
+
 ## 0.17.0 (2026-05-08)
 
 Full Changelog: [v0.16.0...v0.17.0](https://github.com/moderation-api/sdk-php/compare/v0.16.0...v0.17.0)
diff --git a/README.md b/README.md
index 2c89c4d..bc7b771 100644
--- a/README.md
+++ b/README.md
@@ -11,7 +11,7 @@ The REST API documentation can be found on [docs.moderationapi.com](https://docs
 <!-- x-release-please-start-version -->
 
 ```
-composer require "moderation-api/sdk-php 0.17.0"
+composer require "moderation-api/sdk-php 0.17.1"
 ```
 
 <!-- x-release-please-end -->
diff --git a/composer.json b/composer.json
index 34f0c6e..3ff1618 100644
--- a/composer.json
+++ b/composer.json
@@ -38,6 +38,7 @@
   },
   "require-dev": {
     "friendsofphp/php-cs-fixer": "^3",
+    "guzzlehttp/guzzle": "^7",
     "nyholm/psr7": "^1",
     "pestphp/pest": "^3",
     "php-http/mock-client": "^1",
diff --git a/composer.lock b/composer.lock
index 7a5e63d..b0e2283 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
     "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
     "This file is @generated automatically"
   ],
-  "content-hash": "ffa287ea8babf60e021f37e62c6c207a",
+  "content-hash": "bbae64cb4d21c987158bc3723eda4226",
   "packages": [
     {
       "name": "php-http/discovery",
@@ -968,6 +968,332 @@
       ],
       "time": "2026-01-08T21:57:37+00:00"
     },
+    {
+      "name": "guzzlehttp/guzzle",
+      "version": "7.10.0",
+      "source": {
+        "type": "git",
+        "url": "https://github.com/guzzle/guzzle.git",
+        "reference": "b51ac707cfa420b7bfd4e4d5e510ba8008e822b4"
+      },
+      "dist": {
+        "type": "zip",
+        "url": "https://api.github.com/repos/guzzle/guzzle/zipball/b51ac707cfa420b7bfd4e4d5e510ba8008e822b4",
+        "reference": "b51ac707cfa420b7bfd4e4d5e510ba8008e822b4",
+        "shasum": ""
+      },
+      "require": {
+        "ext-json": "*",
+        "guzzlehttp/promises": "^2.3",
+        "guzzlehttp/psr7": "^2.8",
+        "php": "^7.2.5 || ^8.0",
+        "psr/http-client": "^1.0",
+        "symfony/deprecation-contracts": "^2.2 || ^3.0"
+      },
+      "provide": {
+        "psr/http-client-implementation": "1.0"
+      },
+      "require-dev": {
+        "bamarni/composer-bin-plugin": "^1.8.2",
+        "ext-curl": "*",
+        "guzzle/client-integration-tests": "3.0.2",
+        "php-http/message-factory": "^1.1",
+        "phpunit/phpunit": "^8.5.39 || ^9.6.20",
+        "psr/log": "^1.1 || ^2.0 || ^3.0"
+      },
+      "suggest": {
+        "ext-curl": "Required for CURL handler support",
+        "ext-intl": "Required for Internationalized Domain Name (IDN) support",
+        "psr/log": "Required for using the Log middleware"
+      },
+      "type": "library",
+      "extra": {
+        "bamarni-bin": {
+          "bin-links": true,
+          "forward-command": false
+        }
+      },
+      "autoload": {
+        "files": [
+          "src/functions_include.php"
+        ],
+        "psr-4": {
+          "GuzzleHttp\\": "src/"
+        }
+      },
+      "notification-url": "https://packagist.org/downloads/",
+      "license": [
+        "MIT"
+      ],
+      "authors": [
+        {
+          "name": "Graham Campbell",
+          "email": "hello@gjcampbell.co.uk",
+          "homepage": "https://github.com/GrahamCampbell"
+        },
+        {
+          "name": "Michael Dowling",
+          "email": "mtdowling@gmail.com",
+          "homepage": "https://github.com/mtdowling"
+        },
+        {
+          "name": "Jeremy Lindblom",
+          "email": "jeremeamia@gmail.com",
+          "homepage": "https://github.com/jeremeamia"
+        },
+        {
+          "name": "George Mponos",
+          "email": "gmponos@gmail.com",
+          "homepage": "https://github.com/gmponos"
+        },
+        {
+          "name": "Tobias Nyholm",
+          "email": "tobias.nyholm@gmail.com",
+          "homepage": "https://github.com/Nyholm"
+        },
+        {
+          "name": "Márk Sági-Kazár",
+          "email": "mark.sagikazar@gmail.com",
+          "homepage": "https://github.com/sagikazarmark"
+        },
+        {
+          "name": "Tobias Schultze",
+          "email": "webmaster@tubo-world.de",
+          "homepage": "https://github.com/Tobion"
+        }
+      ],
+      "description": "Guzzle is a PHP HTTP client library",
+      "keywords": [
+        "client",
+        "curl",
+        "framework",
+        "http",
+        "http client",
+        "psr-18",
+        "psr-7",
+        "rest",
+        "web service"
+      ],
+      "support": {
+        "issues": "https://github.com/guzzle/guzzle/issues",
+        "source": "https://github.com/guzzle/guzzle/tree/7.10.0"
+      },
+      "funding": [
+        {
+          "url": "https://github.com/GrahamCampbell",
+          "type": "github"
+        },
+        {
+          "url": "https://github.com/Nyholm",
+          "type": "github"
+        },
+        {
+          "url": "https://tidelift.com/funding/github/packagist/guzzlehttp/guzzle",
+          "type": "tidelift"
+        }
+      ],
+      "time": "2025-08-23T22:36:01+00:00"
+    },
+    {
+      "name": "guzzlehttp/promises",
+      "version": "2.3.0",
+      "source": {
+        "type": "git",
+        "url": "https://github.com/guzzle/promises.git",
+        "reference": "481557b130ef3790cf82b713667b43030dc9c957"
+      },
+      "dist": {
+        "type": "zip",
+        "url": "https://api.github.com/repos/guzzle/promises/zipball/481557b130ef3790cf82b713667b43030dc9c957",
+        "reference": "481557b130ef3790cf82b713667b43030dc9c957",
+        "shasum": ""
+      },
+      "require": {
+        "php": "^7.2.5 || ^8.0"
+      },
+      "require-dev": {
+        "bamarni/composer-bin-plugin": "^1.8.2",
+        "phpunit/phpunit": "^8.5.44 || ^9.6.25"
+      },
+      "type": "library",
+      "extra": {
+        "bamarni-bin": {
+          "bin-links": true,
+          "forward-command": false
+        }
+      },
+      "autoload": {
+        "psr-4": {
+          "GuzzleHttp\\Promise\\": "src/"
+        }
+      },
+      "notification-url": "https://packagist.org/downloads/",
+      "license": [
+        "MIT"
+      ],
+      "authors": [
+        {
+          "name": "Graham Campbell",
+          "email": "hello@gjcampbell.co.uk",
+          "homepage": "https://github.com/GrahamCampbell"
+        },
+        {
+          "name": "Michael Dowling",
+          "email": "mtdowling@gmail.com",
+          "homepage": "https://github.com/mtdowling"
+        },
+        {
+          "name": "Tobias Nyholm",
+          "email": "tobias.nyholm@gmail.com",
+          "homepage": "https://github.com/Nyholm"
+        },
+        {
+          "name": "Tobias Schultze",
+          "email": "webmaster@tubo-world.de",
+          "homepage": "https://github.com/Tobion"
+        }
+      ],
+      "description": "Guzzle promises library",
+      "keywords": [
+        "promise"
+      ],
+      "support": {
+        "issues": "https://github.com/guzzle/promises/issues",
+        "source": "https://github.com/guzzle/promises/tree/2.3.0"
+      },
+      "funding": [
+        {
+          "url": "https://github.com/GrahamCampbell",
+          "type": "github"
+        },
+        {
+          "url": "https://github.com/Nyholm",
+          "type": "github"
+        },
+        {
+          "url": "https://tidelift.com/funding/github/packagist/guzzlehttp/promises",
+          "type": "tidelift"
+        }
+      ],
+      "time": "2025-08-22T14:34:08+00:00"
+    },
+    {
+      "name": "guzzlehttp/psr7",
+      "version": "2.9.0",
+      "source": {
+        "type": "git",
+        "url": "https://github.com/guzzle/psr7.git",
+        "reference": "7d0ed42f28e42d61352a7a79de682e5e67fec884"
+      },
+      "dist": {
+        "type": "zip",
+        "url": "https://api.github.com/repos/guzzle/psr7/zipball/7d0ed42f28e42d61352a7a79de682e5e67fec884",
+        "reference": "7d0ed42f28e42d61352a7a79de682e5e67fec884",
+        "shasum": ""
+      },
+      "require": {
+        "php": "^7.2.5 || ^8.0",
+        "psr/http-factory": "^1.0",
+        "psr/http-message": "^1.1 || ^2.0",
+        "ralouphie/getallheaders": "^3.0"
+      },
+      "provide": {
+        "psr/http-factory-implementation": "1.0",
+        "psr/http-message-implementation": "1.0"
+      },
+      "require-dev": {
+        "bamarni/composer-bin-plugin": "^1.8.2",
+        "http-interop/http-factory-tests": "0.9.0",
+        "jshttp/mime-db": "1.54.0.1",
+        "phpunit/phpunit": "^8.5.44 || ^9.6.25"
+      },
+      "suggest": {
+        "laminas/laminas-httphandlerrunner": "Emit PSR-7 responses"
+      },
+      "type": "library",
+      "extra": {
+        "bamarni-bin": {
+          "bin-links": true,
+          "forward-command": false
+        }
+      },
+      "autoload": {
+        "psr-4": {
+          "GuzzleHttp\\Psr7\\": "src/"
+        }
+      },
+      "notification-url": "https://packagist.org/downloads/",
+      "license": [
+        "MIT"
+      ],
+      "authors": [
+        {
+          "name": "Graham Campbell",
+          "email": "hello@gjcampbell.co.uk",
+          "homepage": "https://github.com/GrahamCampbell"
+        },
+        {
+          "name": "Michael Dowling",
+          "email": "mtdowling@gmail.com",
+          "homepage": "https://github.com/mtdowling"
+        },
+        {
+          "name": "George Mponos",
+          "email": "gmponos@gmail.com",
+          "homepage": "https://github.com/gmponos"
+        },
+        {
+          "name": "Tobias Nyholm",
+          "email": "tobias.nyholm@gmail.com",
+          "homepage": "https://github.com/Nyholm"
+        },
+        {
+          "name": "Márk Sági-Kazár",
+          "email": "mark.sagikazar@gmail.com",
+          "homepage": "https://github.com/sagikazarmark"
+        },
+        {
+          "name": "Tobias Schultze",
+          "email": "webmaster@tubo-world.de",
+          "homepage": "https://github.com/Tobion"
+        },
+        {
+          "name": "Márk Sági-Kazár",
+          "email": "mark.sagikazar@gmail.com",
+          "homepage": "https://sagikazarmark.hu"
+        }
+      ],
+      "description": "PSR-7 message implementation that also provides common utility methods",
+      "keywords": [
+        "http",
+        "message",
+        "psr-7",
+        "request",
+        "response",
+        "stream",
+        "uri",
+        "url"
+      ],
+      "support": {
+        "issues": "https://github.com/guzzle/psr7/issues",
+        "source": "https://github.com/guzzle/psr7/tree/2.9.0"
+      },
+      "funding": [
+        {
+          "url": "https://github.com/GrahamCampbell",
+          "type": "github"
+        },
+        {
+          "url": "https://github.com/Nyholm",
+          "type": "github"
+        },
+        {
+          "url": "https://tidelift.com/funding/github/packagist/guzzlehttp/psr7",
+          "type": "tidelift"
+        }
+      ],
+      "time": "2026-03-10T16:41:02+00:00"
+    },
     {
       "name": "jean85/pretty-package-versions",
       "version": "2.1.1",
@@ -3250,6 +3576,50 @@
       },
       "time": "2021-10-29T13:26:27+00:00"
     },
+    {
+      "name": "ralouphie/getallheaders",
+      "version": "3.0.3",
+      "source": {
+        "type": "git",
+        "url": "https://github.com/ralouphie/getallheaders.git",
+        "reference": "120b605dfeb996808c31b6477290a714d356e822"
+      },
+      "dist": {
+        "type": "zip",
+        "url": "https://api.github.com/repos/ralouphie/getallheaders/zipball/120b605dfeb996808c31b6477290a714d356e822",
+        "reference": "120b605dfeb996808c31b6477290a714d356e822",
+        "shasum": ""
+      },
+      "require": {
+        "php": ">=5.6"
+      },
+      "require-dev": {
+        "php-coveralls/php-coveralls": "^2.1",
+        "phpunit/phpunit": "^5 || ^6.5"
+      },
+      "type": "library",
+      "autoload": {
+        "files": [
+          "src/getallheaders.php"
+        ]
+      },
+      "notification-url": "https://packagist.org/downloads/",
+      "license": [
+        "MIT"
+      ],
+      "authors": [
+        {
+          "name": "Ralph Khattar",
+          "email": "ralph.khattar@gmail.com"
+        }
+      ],
+      "description": "A polyfill for getallheaders.",
+      "support": {
+        "issues": "https://github.com/ralouphie/getallheaders/issues",
+        "source": "https://github.com/ralouphie/getallheaders/tree/develop"
+      },
+      "time": "2019-03-08T08:55:37+00:00"
+    },
     {
       "name": "react/cache",
       "version": "v1.2.0",
@@ -6680,5 +7050,5 @@
   "platform-overrides": {
     "php": "8.3"
   },
-  "plugin-api-version": "2.9.0"
+  "plugin-api-version": "2.6.0"
 }
diff --git a/src/Client.php b/src/Client.php
index f10cb9c..c97d303 100644
--- a/src/Client.php
+++ b/src/Client.php
@@ -7,6 +7,7 @@
 use Http\Discovery\Psr17FactoryDiscovery;
 use Http\Discovery\Psr18ClientDiscovery;
 use ModerationAPI\Core\BaseClient;
+use ModerationAPI\Core\Implementation\StreamingHttpClient;
 use ModerationAPI\Core\Util;
 use ModerationAPI\Services\AccountService;
 use ModerationAPI\Services\ActionsService;
@@ -85,6 +86,11 @@ public function __construct(
             $requestOptions,
         );
 
+        if (is_null($options->streamingTransporter)) {
+            assert(!is_null($options->transporter));
+            $options->streamingTransporter = new StreamingHttpClient($options->transporter);
+        }
+
         /** @var array<string, string|null> $headers */
         $headers = [
             'Content-Type' => 'application/json',
diff --git a/src/Core/BaseClient.php b/src/Core/BaseClient.php
index 11a8a11..522379d 100644
--- a/src/Core/BaseClient.php
+++ b/src/Core/BaseClient.php
@@ -241,11 +241,15 @@ protected function sendRequest(
         $req = $req->withHeader('X-Stainless-Retry-Count', strval($retryCount));
         $req = Util::withSetBody($opts->streamFactory, req: $req, body: $data);
 
+        $transporter = Util::isStreamingRequest($req)
+            ? ($opts->streamingTransporter ?? $opts->transporter)
+            : $opts->transporter;
+
         $rsp = null;
         $err = null;
 
         try {
-            $rsp = $opts->transporter->sendRequest($req);
+            $rsp = $transporter->sendRequest($req);
         } catch (ClientExceptionInterface $e) {
             $err = $e;
         }
diff --git a/src/Core/FileParam.php b/src/Core/FileParam.php
index 84c198e..9a0fecc 100644
--- a/src/Core/FileParam.php
+++ b/src/Core/FileParam.php
@@ -41,7 +41,7 @@ public static function fromResource(mixed $resource, ?string $filename = null, s
             throw new \InvalidArgumentException('Expected a resource, got '.get_debug_type($resource));
         }
 
-        if (null === $filename) {
+        if (is_null($filename)) {
             $meta = stream_get_meta_data($resource);
             $filename = basename($meta['uri'] ?? 'upload');
         }
diff --git a/src/Core/Implementation/StreamingHttpClient.php b/src/Core/Implementation/StreamingHttpClient.php
new file mode 100644
index 0000000..ed4b125
--- /dev/null
+++ b/src/Core/Implementation/StreamingHttpClient.php
@@ -0,0 +1,29 @@
+<?php
+
+declare(strict_types=1);
+
+namespace ModerationAPI\Core\Implementation;
+
+use Psr\Http\Client\ClientInterface;
+use Psr\Http\Message\RequestInterface;
+use Psr\Http\Message\ResponseInterface;
+
+/**
+ * @internal
+ *
+ * Wraps a PSR-18 client and produces a response with a non-buffered body when
+ * the underlying client requires an opt-in for streaming
+ */
+final class StreamingHttpClient implements ClientInterface
+{
+    public function __construct(private ClientInterface $inner) {}
+
+    public function sendRequest(RequestInterface $request): ResponseInterface
+    {
+        if (is_a($this->inner, '\GuzzleHttp\Client')) {
+            return $this->inner->send($request, ['stream' => true]);
+        }
+
+        return $this->inner->sendRequest($request);
+    }
+}
diff --git a/src/Core/Util.php b/src/Core/Util.php
index 9a47142..dfacc12 100644
--- a/src/Core/Util.php
+++ b/src/Core/Util.php
@@ -25,6 +25,8 @@ final class Util
 
     public const JSONL_CONTENT_TYPE = '/^application\/(:?x-(?:n|l)djson)|(:?(?:x-)?jsonl)/';
 
+    public const STREAMING_CONTENT_TYPE = ['/^text\/event-stream/', self::JSONL_CONTENT_TYPE];
+
     public static function getenv(string $key): ?string
     {
         if (array_key_exists($key, array: $_ENV)) {
@@ -217,6 +219,16 @@ public static function joinUri(
         return $base->withQuery($qs);
     }
 
+    public static function isStreamingRequest(RequestInterface $request): bool
+    {
+        $accept = $request->getHeaderLine('Accept');
+
+        return !empty(array_filter(
+            self::STREAMING_CONTENT_TYPE,
+            static fn (string $pattern) => (bool) preg_match($pattern, subject: $accept),
+        ));
+    }
+
     /**
      * @param array<string,string|int|list<string|int>|null> $headers
      */
diff --git a/src/RequestOptions.php b/src/RequestOptions.php
index e744a22..05d1800 100644
--- a/src/RequestOptions.php
+++ b/src/RequestOptions.php
@@ -23,6 +23,7 @@
  *   extraQueryParams?: array<string,mixed>|null,
  *   extraBodyParams?: mixed,
  *   transporter?: ClientInterface|null,
+ *   streamingTransporter?: ClientInterface|null,
  *   uriFactory?: UriFactoryInterface|null,
  *   streamFactory?: StreamFactoryInterface|null,
  *   requestFactory?: RequestFactoryInterface|null,
@@ -60,6 +61,9 @@ final class RequestOptions implements BaseModel
     #[Optional]
     public ?ClientInterface $transporter;
 
+    #[Optional]
+    public ?ClientInterface $streamingTransporter;
+
     #[Optional]
     public ?UriFactoryInterface $uriFactory;
 
@@ -98,6 +102,7 @@ public static function with(
         ?array $extraQueryParams = null,
         mixed $extraBodyParams = null,
         ?ClientInterface $transporter = null,
+        ?ClientInterface $streamingTransporter = null,
         ?UriFactoryInterface $uriFactory = null,
         ?StreamFactoryInterface $streamFactory = null,
         ?RequestFactoryInterface $requestFactory = null,
@@ -114,6 +119,9 @@ public static function with(
         null !== $extraQueryParams && $self->extraQueryParams = $extraQueryParams;
         null !== $extraBodyParams && $self->extraBodyParams = $extraBodyParams;
         null !== $transporter && $self->transporter = $transporter;
+        null !== $streamingTransporter && $self
+            ->streamingTransporter = $streamingTransporter
+        ;
         null !== $uriFactory && $self->uriFactory = $uriFactory;
         null !== $streamFactory && $self->streamFactory = $streamFactory;
         null !== $requestFactory && $self->requestFactory = $requestFactory;
@@ -191,6 +199,15 @@ public function withTransporter(ClientInterface $transporter): self
         return $self;
     }
 
+    public function withStreamingTransporter(
+        ClientInterface $streamingTransporter
+    ): self {
+        $self = clone $this;
+        $self->streamingTransporter = $streamingTransporter;
+
+        return $self;
+    }
+
     public function withUriFactory(UriFactoryInterface $uriFactory): self
     {
         $self = clone $this;
diff --git a/src/Version.php b/src/Version.php
index 02b267d..fe855a0 100644
--- a/src/Version.php
+++ b/src/Version.php
@@ -5,5 +5,5 @@
 namespace ModerationAPI;
 
 // x-release-please-start-version
-const VERSION = '0.17.0';
+const VERSION = '0.17.1';
 // x-release-please-end
diff --git a/tests/Core/StreamingTransportTest.php b/tests/Core/StreamingTransportTest.php
new file mode 100644
index 0000000..c93b509
--- /dev/null
+++ b/tests/Core/StreamingTransportTest.php
@@ -0,0 +1,122 @@
+<?php
+
+namespace Tests\Core;
+
+use Http\Discovery\Psr17FactoryDiscovery;
+use Http\Mock\Client as MockClient;
+use ModerationAPI\Core\BaseClient;
+use ModerationAPI\Core\Util;
+use ModerationAPI\RequestOptions;
+use PHPUnit\Framework\Attributes\CoversNothing;
+use PHPUnit\Framework\Attributes\Test;
+use PHPUnit\Framework\TestCase;
+use Psr\Http\Message\ResponseInterface;
+
+/**
+ * @internal
+ *
+ * @coversNothing
+ */
+#[CoversNothing]
+class StreamingTransportTest extends TestCase
+{
+    #[Test]
+    public function testIsStreamingRequestTable(): void
+    {
+        $factory = Psr17FactoryDiscovery::findRequestFactory();
+        $cases = [
+            'text/event-stream' => true,
+            'application/x-ndjson' => true,
+            'application/x-ldjson' => true,
+            'application/jsonl' => true,
+            'application/x-jsonl' => true,
+            'text/event-stream; charset=utf-8' => true,
+            'application/json' => false,
+            'text/plain' => false,
+            '' => false,
+        ];
+
+        foreach ($cases as $accept => $expected) {
+            $req = $factory->createRequest('GET', 'http://localhost');
+            if ('' !== $accept) {
+                $req = $req->withHeader('Accept', $accept);
+            }
+            $this->assertSame(
+                $expected,
+                Util::isStreamingRequest($req),
+                "Accept: '{$accept}'",
+            );
+        }
+    }
+
+    #[Test]
+    public function testRoutesNonStreamingRequestToTransporter(): void
+    {
+        [$client, $plain, $streaming] = $this->buildClient();
+
+        $client->request('GET', '/');
+
+        $this->assertCount(1, $plain->getRequests());
+        $this->assertCount(0, $streaming->getRequests());
+    }
+
+    #[Test]
+    public function testRoutesStreamingRequestToStreamingTransporter(): void
+    {
+        [$client, $plain, $streaming] = $this->buildClient();
+
+        $client->request('GET', '/', headers: ['Accept' => 'text/event-stream']);
+
+        $this->assertCount(0, $plain->getRequests());
+        $this->assertCount(1, $streaming->getRequests());
+
+        $sent = $streaming->getRequests()[0];
+        $this->assertStringContainsString('text/event-stream', $sent->getHeaderLine('Accept'));
+    }
+
+    /**
+     * @return array{BaseClient, MockClient, MockClient}
+     */
+    private function buildClient(): array
+    {
+        $plain = new MockClient;
+        $plain->setDefaultResponse($this->jsonResponse());
+
+        $streaming = new MockClient;
+        $streaming->setDefaultResponse($this->sseResponse());
+
+        $options = RequestOptions::with(
+            transporter: $plain,
+            streamingTransporter: $streaming,
+            uriFactory: Psr17FactoryDiscovery::findUriFactory(),
+            requestFactory: Psr17FactoryDiscovery::findRequestFactory(),
+            streamFactory: Psr17FactoryDiscovery::findStreamFactory(),
+        );
+
+        $client = new class(headers: [], baseUrl: 'http://localhost', options: $options) extends BaseClient {};
+
+        return [$client, $plain, $streaming];
+    }
+
+    private function jsonResponse(): ResponseInterface
+    {
+        $responseFactory = Psr17FactoryDiscovery::findResponseFactory();
+        $streamFactory = Psr17FactoryDiscovery::findStreamFactory();
+
+        return $responseFactory->createResponse(200)
+            ->withHeader('Content-Type', 'application/json')
+            ->withBody($streamFactory->createStream('{}'))
+        ;
+    }
+
+    private function sseResponse(): ResponseInterface
+    {
+        $responseFactory = Psr17FactoryDiscovery::findResponseFactory();
+        $streamFactory = Psr17FactoryDiscovery::findStreamFactory();
+
+        return $responseFactory->createResponse(200)
+            ->withHeader('Content-Type', 'text/event-stream')
+            ->withBody($streamFactory->createStream(''))
+        ;
+    }
+}