add another model; improve link grounding

space_template.py

@@ -428,7 +428,7 @@ Get your API key at: https://openrouter.ai/keys"""
         system_content += f"\\n\\nIMPORTANT: You must respond EXCLUSIVELY in {{LANGUAGE}}. All your responses should be written entirely in {{LANGUAGE}}, even when user input is in a different language, particularly English."
     
     if grounding_context:
-        system_content += "\\n\\nIMPORTANT: When providing information from the reference sources below, please cite the specific URL(s) where the information can be found."
+        system_content += "\\n\\nIMPORTANT: When providing information from the reference sources below, please cite the specific URL(s) where the information can be found. Format citations as plain URLs without brackets, or use markdown link format like [text](url). Never use hard brackets like 【url】 as they break the links."
         system_content = f"{{system_content}}\\n\\n{{grounding_context}}"
     if file_context:
         system_content = f"{{system_content}}\\n\\n{{file_context}}"
@@ -767,6 +767,7 @@ def create_interface():
                                 "anthropic/claude-3.5-sonnet",
                                 "anthropic/claude-3.5-haiku",
                                 # OpenAI models
+                                "openai/gpt-4o-mini",
                                 "openai/gpt-4o-mini-search-preview",
                                 "openai/gpt-oss-120b",
                                 # MistralAI models

utils.py

@@ -337,6 +337,11 @@ AVAILABLE_MODELS = [
         "description": "Fast, efficient Claude model"
     },
     # OpenAI models
+    {
+        "id": "openai/gpt-4o-mini",
+        "name": "GPT-4o Mini",
+        "description": "Fast, cost-effective GPT-4o variant"
+    },
     {
         "id": "openai/gpt-4o-mini-search-preview",
         "name": "GPT-4o Mini Search",