diff --git a/src/Contracts/CopilotSession.php b/src/Contracts/CopilotSession.php
index 105c395..46c2b19 100644
--- a/src/Contracts/CopilotSession.php
+++ b/src/Contracts/CopilotSession.php
@@ -6,6 +6,7 @@
 
 use Closure;
 use Revolution\Copilot\Enums\SessionEventType;
+use Revolution\Copilot\Exceptions\JsonRpcException;
 use Revolution\Copilot\Rpc\SessionRpc;
 use Revolution\Copilot\Types\SessionEvent;
 
@@ -24,6 +25,13 @@ public function id(): string;
      */
     public function rpc(): SessionRpc;
 
+    /**
+     * Switch the model for this session.
+     *
+     * @throws JsonRpcException
+     */
+    public function setModel(string $modelId): void;
+
     /**
      * Send a message to this session.
      */
diff --git a/src/Session.php b/src/Session.php
index d83b847..a2be70e 100644
--- a/src/Session.php
+++ b/src/Session.php
@@ -20,6 +20,7 @@
 use Revolution\Copilot\JsonRpc\JsonRpcClient;
 use Revolution\Copilot\Rpc\SessionRpc;
 use Revolution\Copilot\Support\PermissionRequestKind;
+use Revolution\Copilot\Types\Rpc\SessionModelSwitchToParams;
 use Revolution\Copilot\Types\SessionEvent;
 use Revolution\Copilot\Types\SessionHooks;
 use Revolution\Copilot\Types\UserInputRequest;
@@ -662,6 +663,16 @@ public function destroy(): void
         $this->hooks = null;
     }
 
+    /**
+     * Switch the model for this session.
+     *
+     * @throws JsonRpcException
+     */
+    public function setModel(string $modelId): void
+    {
+        $this->rpc()->model()->switchTo(new SessionModelSwitchToParams(modelId: $modelId));
+    }
+
     /**
      * Abort the currently processing message.
      *
diff --git a/src/Testing/FakeSession.php b/src/Testing/FakeSession.php
index 8ca4089..8ab9fa5 100644
--- a/src/Testing/FakeSession.php
+++ b/src/Testing/FakeSession.php
@@ -47,6 +47,11 @@ public function rpc(): SessionRpc
         );
     }
 
+    public function setModel(string $modelId): void
+    {
+        // No-op in fake
+    }
+
     public function send(string $prompt, ?array $attachments = null, ?string $mode = null): string
     {
         $this->recorded[] = [
diff --git a/tests/Feature/SessionTest.php b/tests/Feature/SessionTest.php
index dfef73d..4b20a84 100644
--- a/tests/Feature/SessionTest.php
+++ b/tests/Feature/SessionTest.php
@@ -299,6 +299,20 @@
         $session->abort();
     });
 
+    it('setModel calls session.model.switchTo via rpc', function () {
+        $mockClient = Mockery::mock(JsonRpcClient::class);
+        $mockClient->shouldReceive('request')
+            ->with('session.model.switchTo', [
+                'modelId' => 'claude-sonnet-4',
+                'sessionId' => 'test-session',
+            ])
+            ->once()
+            ->andReturn(['modelId' => 'claude-sonnet-4']);
+
+        $session = new Session('test-session', $mockClient);
+        $session->setModel('claude-sonnet-4');
+    });
+
     it('handlePermissionRequest uses registered handler', function () {
         $mockClient = Mockery::mock(JsonRpcClient::class);
         $session = new Session('test-session', $mockClient);