GPT-6 Luna

OpenAI’s GPT-6 Luna is a chat model that also supports typed decisions through the Decisions API. The decision mode is used in the same way as Jev: a request provides the content to be evaluated and a set of questions, and the model returns a structured answer with probabilities for each question. Unlike Jev, GPT-6 Luna supports image input.

This page describes the decision usage of GPT-6 Luna. For chat usage, see GPT series.

Choosing between GPT-6 Luna and Jev

The two models return essentially consistent results for the same set of questions: in testing with the same refund ticket, both identified it as a refund request and assigned it to billing.

Quick start

When calling through the official OpenAI Python SDK, install a version that includes client.decisions (pip install -U openai; 3.31.0 has been tested and works). For how to create an API key, see Jev · Quick start.

import os
from openai import OpenAI
 
client = OpenAI(base_url="https://api.ofox.ai/v1", api_key=os.environ["OFOX_API_KEY"])
 
r = client.decisions.create(
    model="openai/gpt-6-luna",
    input="Customer message: I was charged twice and need a refund today.",
    questions=[
        {"type": "predicate", "name": "refund", "instructions": "Is the customer asking for a refund?"},
        {
            "type": "choice",
            "name": "team",
            "instructions": "Which team should handle this ticket?",
            "choices": [
                {"value": "billing", "description": "Charges, invoices, refunds"},
                {"value": "technical", "description": "Outages, errors, integration issues"},
                {"value": "other", "description": "None of the above"},
            ],
        },
    ],
)
refund, team = r.answers
print(refund.probability, team.choice, team.confidence)

Output:

1.0 billing 1.0

Image decisions

To send an image, input must be a message array, with the image passed in content as input_image using a base64 data URL. An input_text part describing the source of the image can be included at the same time.

import base64
import os
from openai import OpenAI
 
client = OpenAI(base_url="https://api.ofox.ai/v1", api_key=os.environ["OFOX_API_KEY"])
 
with open("product.jpg", "rb") as f:
    image = "data:image/jpeg;base64," + base64.b64encode(f.read()).decode()
 
r = client.decisions.create(
    model="openai/gpt-6-luna",
    input=[{
        "role": "user",
        "content": [
            {"type": "input_text", "text": "Product image uploaded by a user"},
            {"type": "input_image", "image_url": image},
        ],
    }],
    questions=[
        {"type": "predicate", "name": "has_text", "instructions": "Does the image contain any text?"},
        {
            "type": "choice",
            "name": "shape",
            "instructions": "What shape is on the left side of the image?",
            "choices": [{"value": "circle"}, {"value": "square"}, {"value": "triangle"}, {"value": "other"}],
        },
    ],
)
for a in r.answers:
    print(a.name, getattr(a, "probability", None) or a.choice)
print(r.usage.prompt_tokens)

Output:

has_text 1.0
shape circle
538

The sample image shows a red circle, a blue square, and a line of text on a white background; both questions were answered correctly. For field definitions, see Decisions API · Input format.

Question design and production readiness

The following sections of the Jev documentation also apply to GPT-6 Luna:

• Question design: options must cover every case, each option should have a description, each question should have a name, and the meaning of the response fields.
• Production readiness: setting confidence thresholds with human-labeled samples, and combining multiple questions into one request.

Billing

The decision mode and the chat mode are billed separately; decision mode rates are listed on the model page . In testing, the usage returned by decision requests contains only prompt_tokens (including the image portion) and does not contain completion_tokens.

Common errors

For error messages and resolutions, see Jev · Common errors and Decisions API · Common errors. Errors related to image input to Jev do not apply to GPT-6 Luna.

Official documentation

• OpenAI · Decisions 

FAQ