Update model preference order for PR generation in CopilotTitleAndDescriptionProvider

Author: AobaIwaki123

src/lm/copilotTitleAndDescriptionProvider.ts

@@ -101,23 +101,35 @@ export class CopilotTitleAndDescriptionProvider implements TitleAndDescriptionPr
 	 * Prioritizes models based on their capabilities for text generation.
 	 */
 	private selectBestModel(models: readonly vscode.LanguageModelChat[]): vscode.LanguageModelChat {
-		// Define model preference order (higher index = higher preference)
+		// Define model preference order (higher priority = better for PR generation)
 		const modelPreferences = [
 			// Basic models (lowest priority)
 			{ vendor: 'copilot', family: 'gpt-3.5-turbo', priority: 1 },
 			{ vendor: 'copilot', family: 'gpt-3.5', priority: 1 },
 
-			// Advanced models (medium priority)
+			// Standard GPT-4 models (medium priority)
 			{ vendor: 'copilot', family: 'gpt-4', priority: 2 },
-			{ vendor: 'copilot', family: 'gpt-4-turbo', priority: 3 },
-			{ vendor: 'copilot', family: 'gpt-4o', priority: 4 },
 			{ vendor: 'copilot', family: 'gpt-4o-mini', priority: 3 },
-
-			// Claude models (highest priority for text generation)
-			{ vendor: 'copilot', family: 'claude-3-haiku', priority: 5 },
-			{ vendor: 'copilot', family: 'claude-3-sonnet', priority: 6 },
-			{ vendor: 'copilot', family: 'claude-3-opus', priority: 7 },
-			{ vendor: 'copilot', family: 'claude-3-5-sonnet', priority: 8 },
+			{ vendor: 'copilot', family: 'gpt-4-turbo', priority: 4 },
+			{ vendor: 'copilot', family: 'gpt-4o', priority: 5 },
+			{ vendor: 'copilot', family: 'gpt-4.1', priority: 6 },
+
+			// Claude models (high priority for text generation)
+			{ vendor: 'copilot', family: 'claude-3-haiku', priority: 7 },
+			{ vendor: 'copilot', family: 'claude-3-sonnet', priority: 8 },
+			{ vendor: 'copilot', family: 'claude-3.5-sonnet', priority: 9 },
+			{ vendor: 'copilot', family: 'claude-3-opus', priority: 10 },
+			{ vendor: 'copilot', family: 'claude-3.7-sonnet', priority: 11 },
+			{ vendor: 'copilot', family: 'claude-3.7-sonnet-thought', priority: 12 },
+
+			// Gemini models (high priority)
+			{ vendor: 'copilot', family: 'gemini-2.0-flash', priority: 13 },
+			{ vendor: 'copilot', family: 'gemini-2.5-pro', priority: 14 },
+
+			// Latest advanced models (highest priority)
+			{ vendor: 'copilot', family: 'o3-mini', priority: 15 },
+			{ vendor: 'copilot', family: 'claude-sonnet-4', priority: 16 },
+			{ vendor: 'copilot', family: 'o4-mini', priority: 17 },
 		];
 
 		// Find the highest priority model available