Assistant prefix for kimi k2

[JunityZhan]

from openai import OpenAI

client = OpenAI(
    api_key="xxx",
    base_url="https://api.moonshot.cn/v1",
)

completion = client.chat.completions.create(
    model="kimi-k2-0711-preview",
    messages=[
        {
            "role": "user",
            "content": "Who are you?",
        },
        {"role": "assistant", "content": "Hi", "partial": True},
    ],
    temperature=0.3,
)

print(completion.choices[0].message.content)

from openai import OpenAI

client = OpenAI(
    api_key="xxx",
    base_url="https://llm.chutes.ai/v1",
)

completion = client.chat.completions.create(
    model="moonshotai/Kimi-K2-Instruct",
    messages=[
        {
            "role": "user",
            "content": "who are you",
        },
        {"role": "assistant", "content": "I am", "partial": True, "prefix": True},
    ],
    temperature=0.3,
)

print(completion.choices[0].message.content)

From the code above, first code I get
Hi! I'm Kimi, your AI assistant and good friend. I'm here to help you with any questions or tasks you have. How can I assist you today?

the second code I get
I’m Kimi, your AI friend from Moonshot AI. How can I assist you today?

Because prefill is not working.