GPT-6 Luna API Pricing
GPT-6 Luna by OpenAI costs $0.10 per million input tokens and $0.50 per million output tokens.
Price verified from OpenAI's pricing page.
Rates and limits
- Input / 1M
- $0.10
- Output / 1M
- $0.50
- Cached input / 1M
- $0.01
- Cache write / 1M
- $0.125
- Batch discount
- 50% off
- Context window
- 1.05M tokens
- Max output
- 128K tokens
- Knowledge cutoff
- May 2026
- Released
- September 2026
Pricing note: Prompts over 272K input tokens are billed at $0.20 in / $0.02 cached / $0.25 cache write / $0.75 out for the whole request. Fast mode is 2x standard; Flex matches Batch (50% off).
What GPT-6 Luna costs per month
Token volume split 3:1 between input and output, with no prompt caching.
| Tokens per month | Input / output | Standard | Batch API |
|---|---|---|---|
| 1M | 750K / 250K | $0.20 | $0.10 |
| 10M | 7.5M / 2.5M | $2.00 | $1.00 |
| 100M | 75M / 25M | $20.00 | $10.00 |
Where to run GPT-6 Luna
Prices above are OpenAI's direct rates. Cloud platforms can charge differently; the cloud platform view compares them.
- OpenAI APIDirect API
- OpenRouterCloud / platform
GPT-6 Luna pricing FAQ
How much does GPT-6 Luna cost per million tokens?
GPT-6 Luna costs $0.10 per million input tokens and $0.50 per million output tokens, as listed on OpenAI's pricing page on September 30, 2026.
How much does GPT-6 Luna cost for 10 million tokens a month?
About $2.00 a month, assuming 7.5 million input and 2.5 million output tokens with no prompt caching, or $1.00 through the batch API.
What is the context window of GPT-6 Luna?
GPT-6 Luna accepts up to 1,050,000 tokens of context and returns up to 128,000 output tokens per request.
Does GPT-6 Luna support prompt caching?
Yes. Cached input tokens cost $0.01 per million, 90% less than the standard input rate. Writing a prefix to the cache costs $0.125 per million tokens.
Is there a batch discount for GPT-6 Luna?
Yes. Requests sent through the batch API cost 50% less: $0.05 per million input tokens and $0.25 per million output tokens.
Where can I use the GPT-6 Luna API?
GPT-6 Luna is available through OpenAI API and OpenRouter.
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Prices shown as input / output per million tokens. All model prices · Side-by-side comparison