GPT-6 Luna
OpenAI’s cheapest GPT-6, with the same million-token memory as Astra.
About GPT-6 Luna
Luna is the volume tier of GPT-6 — the model for jobs you run thousands of times a day. It keeps the flagship’s full 1.05M-token context and 128K-token answers, which is unusual at this price. At maximum effort OpenAI reports 66.6% on DeepSWE, which it puts level with Claude Opus 5 at medium effort.
Its reasoning can be switched off completely, so it also works as a fast plain model. Independent testing puts its intelligence roughly level with GPT-5.6 Luna: the gain is in price, not ability.
Where it’s strong
Sorting, tagging, extracting and routing at high volume.
Cheap helper agents inside a larger system.
Summarising very long documents in one pass.
Where to be careful
Not a step up in ability over GPT-5.6 Luna — the same class of model at a lower price.
Small-model mistakes still happen: one reviewer got Kubernetes files that passed every check and then crashed on start. Test generated code before shipping it.
Price
For scale: 1,000 requests of about 3,000 tokens in and 1,000 out cost $0.92 — a long prompt and a page of answer each. Every rate is published and stays the same from one request to the next. See every model.
Specs
gpt-6-lunaCall it
Use the OpenAI SDK you already have — point it at Roar AI and name the model. Read the docs.
from openai import OpenAI
client = OpenAI(base_url="https://api.roar-ai.com/v1", api_key="roar_live_…")
reply = client.chat.completions.create(
model="gpt-6-luna",
messages=[{"role": "user", "content": "Summarise this contract in plain English."}],
)Compare GPT-6 Luna
Questions
How much does GPT-6 Luna cost?
Input is $0.115 per 1M tokens; output is $0.575 per 1M tokens. For scale, 1,000 requests of about 3,000 tokens in and 1,000 out cost $0.92. The rate is published and does not change from one request to the next.
Can I use GPT-6 Luna alongside other models?
Yes. Every model on Roar AI is on the same API key and the same monthly invoice, so switching from GPT-6 Luna to another model is a change to one word in your code.
Is GPT-6 Luna open source?
No. OpenAI does not publish the weights, so it is only available through an API like this one.