from openai import OpenAI

client = OpenAI(api_key="YOUR_KEY")

stream = client.chat.completions.create(
    model="gpt-4o",
    messages=[
        {"role": "system", "content": "You are concise."},
        {"role": "user", "content": "Explain vector embeddings in two sentences."},
    ],
    temperature=0.3,
    max_tokens=300,
    stream=True,
)

for chunk in stream:
    delta = chunk.choices[0].delta.content
    if delta:
        print(delta, end="", flush=True)