At 4 requests/user/day (totaling 6,000 queries/mo), running Document summarization on o3-pro (Frontier Reasoning) costs $3,018.00 / month ($60.36 / user / mo).
Total expected API invoice for 50 Active Users generating 6,000 queries.
Direct inference cost per MAU to model your SaaS pricing tiers and gross margins.
Savings generated by exploiting 10% cache hits on prompt context.
| Model | Provider | Monthly Spend (50 Active Users) | Cost / User / Mo | Annual Spend | Context Limit |
|---|---|---|---|---|---|
| o3-pro (Frontier Reasoning) (Current) | openai | $3,018.00 | $60.36 | $36,216.00 | 1,000,000 |
| GPT-5.6 Sol | openai | $790.50 | $15.81 | $9,486.00 | 1,050,000 |
| GPT-5.6 Cyber | openai | $1,976.25 | $39.525 | $23,715.00 | 1,050,000 |
| GPT-5.5 Standard | openai | $790.50 | $15.81 | $9,486.00 | 512,000 |
| GPT-5.5 Pro | openai | $4,743.00 | $94.86 | $56,916.00 | 512,000 |
| o3 (Reasoning Frontier) | openai | $1,509.00 | $30.18 | $18,108.00 | 1,050,000 |
At 4 queries per user/day with o3-pro (Frontier Reasoning), the estimated cost is $60.36 per monthly active user (MAU). Total monthly bill for 50 Active Users is $3,018.00.
Assuming a 10% cache hit rate on repeated system and context tokens, prompt caching saves $270.00 per month ($3,240.00/year) on o3-pro (Frontier Reasoning).
With a direct COGS of $60.36 per user/month on o3-pro (Frontier Reasoning), charging at least $301.80 per user/month ensures an 80%+ software gross margin.