GPT-5.5 Pro

textVisionFilesReasoning

OpenAI reasoning flagship — best quality on hard tasks, always reasons, 1M context, understands images and files.

Pricing

Request / 1M

Response / 1M

Parameters

messagesrequired

reasoning_effortlow · medium · high

temperature0–2

max_tokensoptional

streamtrue · false

image_urlimage (data: URL)

filePDF

How to use via API

from openai import OpenAI

client = OpenAI(base_url="https://api.mixen.ai/v1", api_key="mxn-...")
resp = client.chat.completions.create(
    model="openai/gpt-5.5-pro",
    messages=[{"role": "user", "content": "Привет"}],
    reasoning_effort="low",  # low · medium · high
    temperature=0.7,
    max_tokens=1024,
    stream=False,
)
print(resp.choices[0].message.content)

Try in the bot Open in web app API docs

Related models