switch from openai to gemini

agent.py

@@ -7,15 +7,6 @@ from contextlib import AsyncExitStack
 from mcp import ClientSession, StdioServerParameters
 from mcp.client.stdio import stdio_client
 
-from phoenix.otel import register
-
-# configure the Phoenix tracer
-# tracer_provider = register(
-#     endpoint=os.getenv("PHOENIX_ENDPOINT"),
-#     project_name="gradio",  # Default is 'default'
-#     auto_instrument=True,  # Auto-instrument your app based on installed OI dependencies
-# )
-
 instructions = """
 Your task is to help users build and modify Gradio applications within this interactive sandbox
 environment. You are a Gradio application builder that can read, understand, and edit Python code
@@ -450,7 +441,7 @@ def think(reflection: str) -> str:
 
 
 agent = CodeAgent(
-    model=LiteLLMModel(model_id="openai/gpt-4.1", api_key=os.getenv("OPENAI_API_KEY")),
+    model=LiteLLMModel(model_id="gemini/gemini-2.5-flash", api_key=os.getenv("GEMINI_API_KEY")),
     instructions=instructions,
     tools=[
         read_code,