Set the tokens and how often you call the model. The monthly figure is the answer. The maths sits underneath it. A link to this page keeps the numbers, not any text you pasted on the counter.
Monthly cost
$0.45 a month with GPT-6 Luna.
A month is 30 days. Prices last checked 23 October 2026.
The link stores these numbers. It does not store pasted text.
$0.0003 for one request, and $0.02 a day at 50 requests a day.
Show the maths
New input: 1,000 tokens × $0.10 per million = $0.0001
Output: 400 tokens × $0.50 per million = $0.0002
1,500 requests a month × $0.0003 = $0.45
Caching half the input would save about $0.07 a month
That uses the published cache-read price of $0.01 per million tokens. It assumes half of these input tokens are already in a cache. Writing the cache can cost extra, and that write price is not included.
Batch processing would save about $0.23 a month
OpenAI's batch table lists half the standard input and output price for this model. Batch jobs are slower, and they suit work that can wait.
GPT-4.1 nano would cost about $0.06 less a month
It is a cheaper model in the same broad class on this price list. It is still a different model, and the replies will not match.
A reply half as long would save about $0.15 a month
Output tokens are often the expensive part. Asking for a shorter answer cuts that cost directly.
Cached prices here are read prices. Writing a cache can cost extra, and that write price is on the provider’s page, not in this total. A US-only endpoint is 1.1× at some providers and is not included. Fast modes are not included.