Python: updated azure ai inference sample (#5028)

* updated azure ai inference sample

* openai multimodel fix

* update language

python/samples/02-agents/multimodal_input/openai_chat_multimodal.py

@@ -6,7 +6,7 @@ import struct
 from pathlib import Path
 
 from agent_framework import Content, Message
-from agent_framework.foundry import FoundryChatClient
+from agent_framework.openai import OpenAIChatClient, OpenAIChatCompletionClient
 from dotenv import load_dotenv
 
 # Load environment variables from .env file
@@ -14,6 +14,13 @@ load_dotenv()
 
 ASSETS_DIR = Path(__file__).resolve().parents[2] / "shared" / "sample_assets"
 
+"""
+Leverage multimodel capabilities of different models.
+
+Uses the OpenAIChatClient and OpenAIChatCompletionClient to demonstrate multimodal input handling with the gpt-4o and gpt-4o-audio-preview models, respectively. The sample includes demonstrations for image, audio, and PDF inputs, showcasing how to create appropriate Content objects and send them in messages to the chat clients.
+
+"""
+
 
 def load_sample_pdf() -> bytes:
     """Read the bundled sample PDF for tests."""
@@ -46,7 +53,7 @@ def create_sample_audio() -> str:
 
 async def test_image() -> None:
     """Test image analysis with OpenAI."""
-    client = FoundryChatClient(model="gpt-4o")
+    client = OpenAIChatClient(model="gpt-4o")
 
     image_uri = create_sample_image()
     message = Message(
@@ -63,7 +70,7 @@ async def test_image() -> None:
 
 async def test_audio() -> None:
     """Test audio analysis with OpenAI."""
-    client = FoundryChatClient(model="gpt-4o-audio-preview")
+    client = OpenAIChatCompletionClient(model="gpt-4o-audio-preview-2025-06-03")
 
     audio_uri = create_sample_audio()
     message = Message(
@@ -80,7 +87,7 @@ async def test_audio() -> None:
 
 async def test_pdf() -> None:
     """Test PDF document analysis with OpenAI."""
-    client = FoundryChatClient(model="gpt-4o")
+    client = OpenAIChatClient(model="gpt-4o")
 
     pdf_bytes = load_sample_pdf()
     message = Message(