By OpenAI
GPT-6 Luna
A light GPT-6 model that thinks before it answers, at a low price
Price per message
0.2 PMCper message(KRW 8)
Shown as x0.2 in the chat.
Anything extra, such as input beyond the included length, attachments or paid web search, is added up and shown on the send button before you send.
1 PMC is based on KRW 40, and a payment fee is added when you buy PMC (for example, 100 PMC costs KRW 4,476).
Features
- Shows a reasoning summary by default
- Web search +0.5 PMC
- Photo input
- PDF and document input
Try it
Start from an example
- Make a monthly savings plan for a salary of 2 million won
- Explain the quadratic formula with an example
- What should I check when buying a used laptop
Nothing is sent when you click. You review the message in the chat and are charged only when you send it yourself. You can look around without signing in; you sign in when you send.
Sign up and verify your email to get 7.5 bonus PMC, enough for 37 messages with this model at its base price (bonus valid for 90 days).
There is also a free version. Accounts with a verified email can use GPT-6 Luna Free for free up to 70 times a day and 30 times an hour. The free version is set up differently from this model, for example in answer length, and you can pick it in the chat model selector.
Good for
- Homework or work questions that need a moment of thought
- Everyday questions you ask often, at a low price per message
- Reading the reasoning summary to see how it reached the answer
Good to know
- PDFs are read as extracted text only, so tables, charts and scanned images are not reflected in answers.
- Web search costs extra only when turned on. With it off, the model answers from what it knew as of its knowledge cutoff.
- It always reasons before answering, so even short questions can take a while to start.
Specifications
- Provider
- OpenAI
- Released
- September 22, 2026
- Input included per message
- Up to 10,000 characters (extra input is charged)
- Knowledge cutoff
- May 2026
- Input types
- Text, Photos, Files
- PDF handling
- Reads extracted text only
- Web search
- Extra charge when turned on (0.5)
- Reasoning
- Always on
- Multiplier
- x0.2
Sources
- Provider model documentation (checked 2026-10-15)
Compare with other OpenAI models
Prices are the base price per message (memory on, no attachments or search).
| Model | Per message | Reasoning summary | Web search |
|---|---|---|---|
| GPT-6 Luna (This model) | 0.2 PMC | Shown | +0.5 PMC |
| GPT-5.6 Luna | 0.25 PMC | Shown | +0.5 PMC |
| GPT-6 Luna Deep | 0.5 PMC | Shown | Included |
| GPT-4.1 | 0.75 PMC | No | +1 PMC |
| GPT-5.2 | 0.75 PMC | No | +1 PMC |
| GPT-6.1 Terra | 0.75 PMC | Shown | +0.75 PMC |
FAQ
- How much does one message cost?
- The base price is 0.2 PMC (KRW 8) per message, shown as x0.2 in the chat. Anything extra, such as input beyond the included length, attachments or paid web search, is added up and shown on the send button before you send.
- Do I need a monthly subscription?
- No. There is no monthly subscription: you top up PMC and only what you use is deducted each time you send. 1 PMC is based on KRW 40, and a payment fee is added when you buy PMC (for example, 100 PMC costs KRW 4,476).
- Can it search the web?
- Yes. If you turn web search on when sending, 0.5 PMC is added to that message.
- Can I upload photos or files?
- Yes. You can send photos as well as PDFs and document files. If a file costs extra, the amount is shown on the send button before you send.
- Can I see a reasoning summary?
- Yes. A short summary of what it worked through before answering is shown by default, at no extra charge.
- What is the reasoning summary?
- It is a short summary, shown above the answer, of what the model worked through before answering. There is no extra charge.