# 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.

- Page: https://tecyfy.com/prices/gpt-6-luna
- Maker: OpenAI

## Price per million tokens, in US dollars

| | Price |
| --- | --: |
| Input | $0.10 |
| Cached input | $0.01 |
| Cache write | $0.125 |
| Output | $0.50 |
| Blend, 3 read for each 1 written | $0.20 |
| Batch input | $0.05 |
| Batch output | $0.25 |
| Long prompt input (over 272K tokens) | $0.20 |
| Long prompt output | $0.75 |
| Context window, tokens | 1.05M |
| Longest answer, tokens | 128K |
| Capability score (Epoch Capabilities Index; GPT-5 is 150) | 156 |

## What 8 everyday jobs cost a month

Each job at its usual runs a day, for 30 days, at the standard price.

| Job | Tokens in, out, runs a day | A run | A month |
| --- | --- | --: | --: |
| A chat question | 300, 500, 100 | 0.028 cents | 84 cents |
| A hard question, with thinking | 300, 1,400, 100 | 0.073 cents | $2.19 |
| A long report, summarised | 60,000, 2,000, 20 | 0.7 cents | $4.20 |
| A 40-turn agent task | 2,800,000, 40,000, 10 | 7.3 cents | $21.96 |
| A support bot's reply | 4,000, 300, 2,000 | 0.037 cents | $22.20 |
| Sort a message into a category | 250, 5, 50,000 | 0.0028 cents | $41.25 |
| Read an invoice into fields | 1,500, 250, 1,000 | 0.027 cents | $8.25 |
| Review a pull request | 25,000, 4,500, 50 | 0.48 cents | $7.13 |

## Cheaper models that score as well as GPT-6 Luna

None of the newest models that scores about as well costs less on a mix of 3 tokens read for each 1 written.

## 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.

## Sources

- [OpenAI: API prices](https://developers.openai.com/api/docs/pricing)
- [Epoch Capabilities Index, by Epoch AI (CC BY 4.0)](https://epoch.ai/benchmarks/eci)
- Every model's prices as [JSON](https://tecyfy.com/prices.json) or [CSV](https://tecyfy.com/prices.csv), free to use

## Compare

- [GPT-6 Luna vs GPT-6 Sol](https://tecyfy.com/prices/compare/gpt-6-luna-vs-gpt-6-sol.md)
- [GPT-5.6 Sol vs GPT-6 Luna](https://tecyfy.com/prices/compare/gpt-5-6-sol-vs-gpt-6-luna.md)
- [GPT-5.6 Terra vs GPT-6 Luna](https://tecyfy.com/prices/compare/gpt-5-6-terra-vs-gpt-6-luna.md)
- [GPT-5.6 Luna vs GPT-6 Luna](https://tecyfy.com/prices/compare/gpt-5-6-luna-vs-gpt-6-luna.md)
- [GPT-5.5 vs GPT-6 Luna](https://tecyfy.com/prices/compare/gpt-5-5-vs-gpt-6-luna.md)
- [GPT-5.5 pro vs GPT-6 Luna](https://tecyfy.com/prices/compare/gpt-5-5-pro-vs-gpt-6-luna.md)
- [GPT-5.4 vs GPT-6 Luna](https://tecyfy.com/prices/compare/gpt-5-4-vs-gpt-6-luna.md)
- [GPT-5.4 mini vs GPT-6 Luna](https://tecyfy.com/prices/compare/gpt-5-4-mini-vs-gpt-6-luna.md)

## OpenAI's other models

- [GPT-6 Astra](https://tecyfy.com/prices/gpt-6-astra.md)
- [GPT-6.1 Sol](https://tecyfy.com/prices/gpt-6-1-sol.md)
- [GPT-6 Sol](https://tecyfy.com/prices/gpt-6-sol.md)
- [GPT-5.6 Sol](https://tecyfy.com/prices/gpt-5-6-sol.md)
- [GPT-5.6 Terra](https://tecyfy.com/prices/gpt-5-6-terra.md)
- [GPT-5.6 Luna](https://tecyfy.com/prices/gpt-5-6-luna.md)
- [GPT-5.5](https://tecyfy.com/prices/gpt-5-5.md)
- [GPT-5.5 pro](https://tecyfy.com/prices/gpt-5-5-pro.md)
- [GPT-5.4](https://tecyfy.com/prices/gpt-5-4.md)
- [GPT-5.4 mini](https://tecyfy.com/prices/gpt-5-4-mini.md)
- [GPT-5.4 nano](https://tecyfy.com/prices/gpt-5-4-nano.md)
- [GPT-5.4 pro](https://tecyfy.com/prices/gpt-5-4-pro.md)
- [GPT-5.2](https://tecyfy.com/prices/gpt-5-2.md)
- [GPT-5.2 pro](https://tecyfy.com/prices/gpt-5-2-pro.md)
- [GPT-5.1](https://tecyfy.com/prices/gpt-5-1.md)
- [GPT-5](https://tecyfy.com/prices/gpt-5.md)
- [GPT-5 mini](https://tecyfy.com/prices/gpt-5-mini.md)
- [GPT-5 nano](https://tecyfy.com/prices/gpt-5-nano.md)
- [GPT-5 pro](https://tecyfy.com/prices/gpt-5-pro.md)
- [GPT-4.1](https://tecyfy.com/prices/gpt-4-1.md)
- [GPT-4.1 mini](https://tecyfy.com/prices/gpt-4-1-mini.md)
- [GPT-4.1 nano](https://tecyfy.com/prices/gpt-4-1-nano.md)
- [GPT-4o](https://tecyfy.com/prices/gpt-4o.md)
- [GPT-4o (2024-05-13)](https://tecyfy.com/prices/gpt-4o-2024-05-13.md)
- [GPT-4o mini](https://tecyfy.com/prices/gpt-4o-mini.md)
- [o1](https://tecyfy.com/prices/o1.md)
- [o1-pro](https://tecyfy.com/prices/o1-pro.md)
- [o3-pro](https://tecyfy.com/prices/o3-pro.md)
- [o3](https://tecyfy.com/prices/o3.md)
- [o4-mini](https://tecyfy.com/prices/o4-mini.md)
- [o3-mini](https://tecyfy.com/prices/o3-mini.md)
- [GPT-4 Turbo (2024-04-09)](https://tecyfy.com/prices/gpt-4-turbo-2024-04-09.md)
- [GPT-4 (0613)](https://tecyfy.com/prices/gpt-4-0613.md)
- [GPT-3.5 Turbo](https://tecyfy.com/prices/gpt-3-5-turbo.md)
- [GPT-3.5 Turbo (0125)](https://tecyfy.com/prices/gpt-3-5-turbo-0125.md)
- [GPT-3.5 Turbo (1106)](https://tecyfy.com/prices/gpt-3-5-turbo-1106.md)
- [GPT-3.5 Turbo Instruct](https://tecyfy.com/prices/gpt-3-5-turbo-instruct.md)
- [davinci-002](https://tecyfy.com/prices/davinci-002.md)
- [babbage-002](https://tecyfy.com/prices/babbage-002.md)