GPT-6 Luna API pricing
GPT-6 Luna costs $0.10 per million input tokens and $0.50 per million output tokens at the standard rate. Here are its cached and batch prices, and what it costs for your usage.
| Token type | Standard | Batch (50% off) |
|---|---|---|
| Input | $0.10 | $0.05 |
| Cached input | $0.01 | $0.005 |
| Output | $0.50 | $0.25 |
GPT-6 Luna: Long prompts are billed at higher long-context rates.
- Input $3.00
- Cached input $0.3
- Output $4.50
| Workload | Standard | Batch | |
|---|---|---|---|
Support chatbot 2,000 in / 300 out tokens,
1,000 requests a day, 50% cached | $7.80 | $3.90 | 2nd cheapest of 18 |
Document summaries 10,000 in / 800 out tokens,
200 requests a day | $8.40 | $4.20 | 2nd cheapest of 18 |
Tagging / classifying 400 in / 20 out tokens,
20,000 requests a day | $30.00 | $15.00 | 2nd cheapest of 18 |
Compare GPT-6 Luna with
Other OpenAI models
FAQ
Frequently asked questions
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 at the standard rate. Prices are in USD, before tax, from OpenAI API pricing, last checked on 30 Sept 2026. Long prompts are billed at higher long-context rates.
Does GPT-6 Luna have a Batch API discount?
Yes. Through the Batch API, GPT-6 Luna costs $0.05 per million input tokens and $0.25 per million output tokens, 50% less than the standard rate. Batch requests are processed asynchronously rather than straight away.
How much does prompt caching save on GPT-6 Luna?
Input read from the prompt cache costs $0.01 per million tokens instead of $0.10, 90% less. Writing to or storing the cache can cost extra; those charges aren’t included here.
Is GPT-6 Luna one of the cheaper API models?
For a support chatbot sending 1,000 requests a day (2,000 input and 300 output tokens each, 50% of the input cached), GPT-6 Luna is the 2nd cheapest of the 18 OpenAI, Anthropic and Google models we track, at $7.80 a month. Price alone doesn’t tell you how well a model will handle your task, so test the candidates on your own prompts.