At 20 requests/user/day (totaling 30,000 queries/mo), running Content generation on GPT-5.6 Luna Pro (OpenRouter) costs $46.704 / month ($0.9341 / user / mo).
Content generation for a 50 active users (private beta) audience means 1,000 requests per day on average, each carrying 800 input and 1,200 output tokens at a 30% cacheable share — so the effective per-request cost on GPT-5.6 Luna Pro (OpenRouter) is $0.001557, of which $1.296/mo comes back from prompt caching. Per active user that's $0.9341/mo — the number to hold against your pricing tier and gross margin. Charging at least $4.67/user/mo keeps gross margin at or above 80%.
Quick answer
For 50 Active Users, Content generation on GPT-5.6 Luna Pro (OpenRouter) is modeled at 30,000 requests per month, costing $46.704 per month or $0.9341 per active user.
Method & trust
This projection combines the selected active-user tier, requests per user per day, input/output tokens per request, and the modeled cache share. It is an operating estimate, not a provider invoice; production traffic and retries should be measured against it.
Total expected API invoice for 50 Active Users generating 30,000 queries.
Direct inference cost per MAU to model your SaaS pricing tiers and gross margins.
Savings generated by exploiting 30% cache hits on prompt context.
| Model | Provider | Monthly Spend (50 Active Users) | Cost / User / Mo | Annual Spend | Context Limit |
|---|---|---|---|---|---|
| GPT-5.6 Luna Pro (OpenRouter) (Current) | openai | $46.704 | $0.9341 | $560.448 | 1,050,000 |
| GPT-5.6 Sol | openai | $1,167.60 | $23.352 | $14,011.20 | 1,050,000 |
| GPT-5.6 Cyber | openai | $2,919.00 | $58.38 | $35,028.00 | 1,050,000 |
| GPT-5.5 Standard | openai | $1,167.60 | $23.352 | $14,011.20 | 512,000 |
| GPT-5.5 Pro | openai | $7,005.60 | $140.112 | $84,067.20 | 512,000 |
| o3-pro (Frontier Reasoning) | openai | $3,230.40 | $64.608 | $38,764.80 | 1,000,000 |
At 20 queries per user/day with GPT-5.6 Luna Pro (OpenRouter), the estimated cost is $0.9341 per monthly active user (MAU). Total monthly bill for 50 Active Users is $46.704.
Assuming a 30% cache hit rate on repeated system and context tokens, prompt caching saves $1.296 per month ($15.552/year) on GPT-5.6 Luna Pro (OpenRouter).
With a direct COGS of $0.9341 per user/month on GPT-5.6 Luna Pro (OpenRouter), charging at least $4.67 per user/month ensures an 80%+ software gross margin.