GPT-6 Luna costs $0.22 per million words.
OpenAI lists it at $0.10 per million input tokens and $0.50 per million output tokens on OpenAI’s pricing page, read 4:40 PM Eastern, Oct 7, 2026. It bills about 1,123 tokens for a thousand English words, so a million words, three in for every one out, costs $0.22.
- Maker
- OpenAI
- Input
- $0.10 per million tokens
- Output
- $0.50 per million tokens
- Cached input
- $0.01 per million tokens
- Tokens for 1,000 words
- 1,123, measured by Brass on Oct 7, 2026
- Source
- OpenAI’s pricing page
Brass does not offer GPT-6 Luna in its chat. The nearest model it offers from OpenAI is GPT-6.1 Sol: $4.49 per million words at OpenAI’s price, $5.61 in the Brass chat. The lowest-priced model in the Brass chat is DeepSeek V4.1 Flash, at $0.74 per million words.
To use the models Brass offers, buy a pack.
Price history
| From | Per million words | Per million tokens, in / out |
|---|---|---|
| Oct 7, 2026 | $0.22 | $0.10 / $0.50 |
We began tracking GPT-6 Luna on Oct 7, 2026.