At 20 requests/user/day (totaling 30,000 queries/mo), running Content generation on o3 (Reasoning Frontier) costs $1,615.20 / month ($32.304 / user / mo).
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 |
|---|---|---|---|---|---|
| o3 (Reasoning Frontier) (Current) | openai | $1,615.20 | $32.304 | $19,382.40 | 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 o3 (Reasoning Frontier), the estimated cost is $32.304 per monthly active user (MAU). Total monthly bill for 50 Active Users is $1,615.20.
Assuming a 30% cache hit rate on repeated system and context tokens, prompt caching saves $64.80 per month ($777.60/year) on o3 (Reasoning Frontier).
With a direct COGS of $32.304 per user/month on o3 (Reasoning Frontier), charging at least $161.52 per user/month ensures an 80%+ software gross margin.