import openai

def analyze_chunk(chunk, openai_key):
    openai.api_key = openai_key
    try:
        response = openai.ChatCompletion.create(
            model="gpt-4-turbo",
            messages=[
                {"role": "system", "content": "Summarize and analyze the following chunk."},
                {"role": "user", "content": chunk}
            ]
        )
        return response['choices'][0]['message']['content']
    except Exception as e:
        return f"Error: {str(e)}"