Change Discord chat model

Author: mangstadt

src/main/java/oakbot/discord/ChatGPTListener.java

@@ -91,6 +91,7 @@ public void onMessage(MessageReceivedEvent event, BotContext context) {
 			.model(model)
 			.maxTokens(maxTokens)
 			.messages(openAIMessages)
+			.reasoningEffort("low")
 		.build();
 		//@formatter:on
 

src/main/java/oakbot/discord/MainDiscord.java

@@ -36,7 +36,7 @@ public static void main(String[] args) throws Exception {
 			new ShutdownCommand()
 		));
 		var listeners = List.of(
-			new ChatGPTListener(openAIClient, "gpt-5", properties.getOpenAIPrompt(), 2000, properties.getOpenAIMessageHistoryCount()),
+			new ChatGPTListener(openAIClient, "gpt-5-mini", properties.getOpenAIPrompt(), 2000, properties.getOpenAIMessageHistoryCount()),
 			new WaveListener(),
 			new CommandListener(trigger, commands)
 		);