Remove GPT-5 Chat model tool call capabilities

Author: chr-hertel

src/platform/src/Bridge/OpenAi/Gpt.php

@@ -81,9 +81,12 @@ public function __construct(
             Capability::INPUT_MESSAGES,
             Capability::OUTPUT_TEXT,
             Capability::OUTPUT_STREAMING,
-            Capability::TOOL_CALLING,
         ];
 
+        if (self::GPT_5_CHAT !== $name) {
+            $capabilities[] = Capability::TOOL_CALLING;
+        }
+
         if (self::GPT_4O_AUDIO === $name) {
             $capabilities[] = Capability::INPUT_AUDIO;
         }