Is 03-mini in the API the "low", "medium" or "high" version?

API
2

There is a new parameter called reasoning_effort= which you can set to high medium or low to set that.

from openai import OpenAI
client = OpenAI()

response = client.chat.completions.create(
  model="o3-mini-2025-01-31",
  messages=[
    {
      "role": "developer",
      "content": [
        {
          "type": "text",
          "text": "You are a helpful assistant"
        }
      ]
    },
    {
      "role": "user",
      "content": [
        {
          "type": "text",
          "text": "why does the moon sometimes appear in the day?"
        }
      ]
    }
  ],
  response_format={
    "type": "text"
  },
  reasoning_effort="low"
)
3 Likes