How much does GPT-6 Luna cost?

GPT-6 Luna costs $0.10 per million input tokens, the text it reads, and $0.50 per million output tokens, the text it writes, thinking included. On a mix of 3 tokens read for each 1 written, that is $0.20 per million.

How much does cached input cost on GPT-6 Luna?

Text GPT-6 Luna reads again from the cache costs $0.01 per million tokens, against $0.10 the first time. Putting text in the cache costs $0.125 per million, so a long prompt sent again and again costs far less after the first time.

Does GPT-6 Luna have a batch price?

Yes. With a batch, where you send many requests and collect the answers later instead of at once, GPT-6 Luna costs $0.05 per million tokens read and $0.25 per million written.

Does a long prompt cost more on GPT-6 Luna?

Yes. Once a prompt passes 272K tokens, the whole request costs $0.20 per million tokens read and $0.75 per million written, against $0.10 and $0.50 below that.

What is the context window of GPT-6 Luna?

GPT-6 Luna holds 1.05M tokens at once, about 1,600 pages of English text, and writes up to 128K tokens in one answer. The window holds your instructions, the files you attach, the conversation so far and the answer.

How good is GPT-6 Luna?

GPT-6 Luna scores 156 on the Epoch Capabilities Index, an independent score from Epoch AI that combines over 50 benchmarks, with a range of doubt from 154 to 159 (GPT-5 is 150). One score is an average; test it on 10 tasks of your own.

Where does GPT-6 Luna rank on price?

GPT-6 Luna is the 2nd cheapest of the 16 newest models we list, by the price of 3 tokens read for each 1 written.

What does a support bot cost a month on GPT-6 Luna?

At 2,000 replies a day, each reading 4,000 tokens (50 percent of them from cache) and writing 300, a support bot costs 0.037 cents a reply on GPT-6 Luna, $22.20 a month.

What does an AI agent task cost on GPT-6 Luna?

One 40-turn task that reads 2,800,000 tokens in all, 90 percent of them from cache, and writes 40,000, costs 7.3 cents on GPT-6 Luna. At 10 tasks a day that is $21.96 a month.

GPT-6 Luna API pricing

GPT-6 Luna is one of OpenAI's newest models. It costs $0.10 per million tokens it reads and $0.50 per million it writes, $0.20 on a mix of 3 read for each 1 written. Below are every price OpenAI lists for it, what 8 everyday jobs cost a month on it, and the models that do as well for less.

Price your own job Compare it

Input: $0.10 per million tokens read
Output: $0.50 per million tokens written
On everyday work: $0.20 per million, 3 read for each 1 written, the 2nd cheapest of the 16 newest models
Context window: 1.05M tokens at once
Capability score: 156 on the Epoch Capabilities Index, GPT-5 is 150

Every GPT-6 Luna price, per million tokens

In US dollars, as OpenAI prints them on its price page.

InputTokens the model reads	$0.10
Cached inputRead again from the cache	$0.01
Cache writePutting text in the cache	$0.125
OutputTokens it writes, thinking included	$0.50
Blend 3:13 tokens read for each 1 written	$0.20
Batch inputAnswers collected later	$0.05
Batch output	$0.25
Long prompt inputA prompt over 272K tokens	$0.20
Long prompt output	$0.75
Context windowTokens it holds at once	1.05M tokens
Longest answerTokens it writes in 1 reply	128K tokens

What 8 everyday jobs cost a month on GPT-6 Luna

Each job at its usual number of runs a day, for 30 days, at the standard price. Open any job in the cost calculator to change its size, or to set it beside every other model.

Job	A run	A month
A chat question300 in, 500 out, 100 a day	0.028 cents	84 cents
A hard question, with thinking300 in, 1,400 out, 100 a day	0.073 cents	$2.19
A long report, summarised60,000 in, 2,000 out, 20 a day	0.7 cents	$4.20
A 40-turn agent task2,800,000 in, 40,000 out, 10 a day	7.3 cents	$21.96
A support bot's reply4,000 in, 300 out, 2,000 a day	0.037 cents	$22.20
Sort a message into a category250 in, 5 out, 50,000 a day	0.0028 cents	$41.25
Read an invoice into fields1,500 in, 250 out, 1,000 a day	0.027 cents	$8.25
Review a pull request25,000 in, 4,500 out, 50 a day	0.48 cents	$7.13

No newest model scores as well for less

Of the newest models we list, none that scores about as well on the Epoch Capabilities Index costs less on a mix of 3 tokens read for each 1 written.

Compare GPT-6 Luna

Both price lists side by side, and what the same 8 jobs cost on each.

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How to read a model's prices

Every maker prints 2 main prices: one for the tokens a model reads (input) and one for the tokens it writes (output), each per million tokens. Writing costs more on almost every model, so a job that reads a long document and writes a line pays mostly the input price, and a chat that writes paragraphs pays mostly the output price. The blend, 3 tokens read for each 1 written, is one figure for ranking models on everyday work.

The other prices lower or raise the bill. Text read again from a cache costs a fraction of the input price, so a long system prompt or document sent with every request gets cheaper after the first. Work that can wait a day costs about half on a batch where the maker offers one. Some models charge more for every token once a prompt passes a set length.

Thinking is billed as output, and the same text is not the same number of tokens on every model, so the price per token is only the start. Each job below is priced the way the cost calculator prices it, at its usual runs a day for 30 days; open one to change its size, or compare the model with another side by side.

Questions

How much does GPT-6 Luna cost?: GPT-6 Luna costs $0.10 per million input tokens, the text it reads, and $0.50 per million output tokens, the text it writes, thinking included. On a mix of 3 tokens read for each 1 written, that is $0.20 per million.
How much does cached input cost on GPT-6 Luna?: Text GPT-6 Luna reads again from the cache costs $0.01 per million tokens, against $0.10 the first time. Putting text in the cache costs $0.125 per million, so a long prompt sent again and again costs far less after the first time.
Does GPT-6 Luna have a batch price?: Yes. With a batch, where you send many requests and collect the answers later instead of at once, GPT-6 Luna costs $0.05 per million tokens read and $0.25 per million written.
Does a long prompt cost more on GPT-6 Luna?: Yes. Once a prompt passes 272K tokens, the whole request costs $0.20 per million tokens read and $0.75 per million written, against $0.10 and $0.50 below that.
What is the context window of GPT-6 Luna?: GPT-6 Luna holds 1.05M tokens at once, about 1,600 pages of English text, and writes up to 128K tokens in one answer. The window holds your instructions, the files you attach, the conversation so far and the answer.
How good is GPT-6 Luna?: GPT-6 Luna scores 156 on the Epoch Capabilities Index, an independent score from Epoch AI that combines over 50 benchmarks, with a range of doubt from 154 to 159 (GPT-5 is 150). One score is an average; test it on 10 tasks of your own.
Is there a cheaper model as good as GPT-6 Luna?: Not among the newest models we list: none that scores about as well on the Epoch Capabilities Index costs less on a mix of 3 tokens read for each 1 written.
Where does GPT-6 Luna rank on price?: GPT-6 Luna is the 2nd cheapest of the 16 newest models we list, by the price of 3 tokens read for each 1 written.
What does a support bot cost a month on GPT-6 Luna?: At 2,000 replies a day, each reading 4,000 tokens (50 percent of them from cache) and writing 300, a support bot costs 0.037 cents a reply on GPT-6 Luna, $22.20 a month.
What does an AI agent task cost on GPT-6 Luna?: One 40-turn task that reads 2,800,000 tokens in all, 90 percent of them from cache, and writes 40,000, costs 7.3 cents on GPT-6 Luna. At 10 tasks a day that is $21.96 a month.

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