At 20 requests/user/day (totaling 60,000 queries/mo), running Content generation on o3-pro (Frontier Reasoning) costs $6,460.80 / month ($64.608 / user / mo).
Total expected API invoice for 100 Active Users generating 60,000 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 (100 Active Users) | Cost / User / Mo | Annual Spend | Context Limit |
|---|---|---|---|---|---|
| o3-pro (Frontier Reasoning) (Current) | openai | $6,460.80 | $64.608 | $77,529.60 | 1,000,000 |
| GPT-5.6 Sol | openai | $2,335.20 | $23.352 | $28,022.40 | 1,050,000 |
| GPT-5.6 Cyber | openai | $5,838.00 | $58.38 | $70,056.00 | 1,050,000 |
| GPT-5.5 Standard | openai | $2,335.20 | $23.352 | $28,022.40 | 512,000 |
| GPT-5.5 Pro | openai | $14,011.20 | $140.112 | $168,134.40 | 512,000 |
| o3 (Reasoning Frontier) | openai | $3,230.40 | $32.304 | $38,764.80 | 1,050,000 |
At 20 queries per user/day with o3-pro (Frontier Reasoning), the estimated cost is $64.608 per monthly active user (MAU). Total monthly bill for 100 Active Users is $6,460.80.
Assuming a 30% cache hit rate on repeated system and context tokens, prompt caching saves $259.20 per month ($3,110.40/year) on o3-pro (Frontier Reasoning).
With a direct COGS of $64.608 per user/month on o3-pro (Frontier Reasoning), charging at least $323.04 per user/month ensures an 80%+ software gross margin.