エンドポイントの選択：GPT-5.4以降をResponsesへ移行

from openai import OpenAI

client = OpenAI(api_key="YOUR_APIYI_KEY", base_url="https://api.apiyi.com/v1")

tools = [{
    "type": "function",
    "function": {
        "name": "get_weather",
        "description": "Look up the weather for a city",
        "parameters": {
            "type": "object",
            "properties": {"city": {"type": "string"}},
            "required": ["city"],
        },
    },
}]

messages = [{"role": "user", "content": "What is the weather in Beijing today?"}]

resp = client.chat.completions.create(
    model="gpt-5.6-luna", messages=messages, tools=tools,
    reasoning_effort="medium",              # sent alongside tools; may be rejected
)

call = resp.choices[0].message.tool_calls[0]
messages.append(resp.choices[0].message)    # the assistant turn, verbatim
messages.append({
    "role": "tool",
    "tool_call_id": call.id,
    "content": '{"temp": 26, "sky": "clear"}',
})

final = client.chat.completions.create(
    model="gpt-5.6-luna", messages=messages, tools=tools,
    reasoning_effort="medium",
)
print(final.choices[0].message.content)

from openai import OpenAI

client = OpenAI(api_key="YOUR_APIYI_KEY", base_url="https://api.apiyi.com/v1")

tools = [{                                  # flat, with no "function" wrapper
    "type": "function",
    "name": "get_weather",
    "description": "Look up the weather for a city",
    "parameters": {
        "type": "object",
        "properties": {"city": {"type": "string"}},
        "required": ["city"],
        "additionalProperties": False,
    },
}]

history = [{"role": "user", "content": "What is the weather in Beijing today?"}]

resp = client.responses.create(
    model="gpt-5.6-luna", input=history, tools=tools,
    reasoning={"effort": "medium"},         # nested, and unrestricted here
)

call = next(i for i in resp.output if i.type == "function_call")
history += resp.output                      # append the whole output verbatim
history.append({
    "type": "function_call_output",
    "call_id": call.call_id,                # note: call_id, not id
    "output": '{"temp": 26, "sky": "clear"}',
})

final = client.responses.create(
    model="gpt-5.6-luna", input=history, tools=tools,
    reasoning={"effort": "medium"},
)
print(final.output_text)