GPT-5.6 Luna
The fast, low-cost GPT-5.6, for high-volume work.
About GPT-5.6 Luna
GPT-5.6 Luna is the cheapest tier of the GPT-5.6 family, built for what OpenAI calls cost-sensitive, high-volume workloads. It is quick — independent measurements put it at about 178 tokens a second — and it scored 82.5% on Terminal-Bench 2.1, strong for the bottom tier of a family.
GPT-6 Luna has since replaced it with similar ability and newer knowledge, so this one is for products already running on it.
Where it’s strong
High-volume extraction and classification.
Light coding and command-line helper agents.
Products already built on GPT-5.6.
Where to be careful
Wordy: in one independent benchmark run it wrote about twice the median amount of output, and output is what you pay for.
Replaced by GPT-6 Luna, whose knowledge is three months newer.
Price in rupees
For scale: 1,000 requests of about 3,000 tokens in and 1,000 out cost $2.07 — 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-5.6-lunaUsing it from Sri Lanka
GPT-5.6 Luna is billed in rupees, on the same monthly invoice as every other model your team uses — no foreign card, no separate OpenAI account, and one key for all of it.
Prompts sent to GPT-5.6 Luna are processed outside Sri Lanka. If a workload has to stay in the country, Qwen3.8-27B (Colombo) runs on our own servers in Colombo.
Call 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-5.6-luna",
messages=[{"role": "user", "content": "Summarise this contract in plain English."}],
)Compare GPT-5.6 Luna
Questions
How much does GPT-5.6 Luna cost in Sri Lanka?
Input is $0.23 per 1M tokens; output is $1.38 per 1M tokens. For scale, 1,000 requests of about 3,000 tokens in and 1,000 out cost $2.07. The rate is published and does not change from one request to the next.
Can I pay for GPT-5.6 Luna in Sri Lankan rupees?
Yes. Usage is billed to one monthly invoice in rupees, together with every other model your team uses, and you can also pay by card. There is no separate OpenAI account to open and no foreign card needed.
Does GPT-5.6 Luna keep data in Sri Lanka?
No — prompts sent to GPT-5.6 Luna are processed outside Sri Lanka. If your data has to stay in the country, use Qwen3.8-27B (Colombo), which runs on our servers in Colombo.
Is GPT-5.6 Luna open source?
No. OpenAI does not publish the weights, so it is only available through an API like this one.