At 8 requests/user/day (totaling 2,400,000 queries/mo), running Agentic workflow on GPT-5.5 Pro costs $1,843,200.00 / month ($184.32 / user / mo).
Total expected API invoice for 10,000 Active Users generating 2,400,000 queries.
Direct inference cost per MAU to model your SaaS pricing tiers and gross margins.
Savings generated by exploiting 65% cache hits on prompt context.
| Model | Provider | Monthly Spend (10,000 Active Users) | Cost / User / Mo | Annual Spend | Context Limit |
|---|---|---|---|---|---|
| GPT-5.5 Pro (Current) | openai | $1,843,200.00 | $184.32 | $22,118,400.00 | 512,000 |
| GPT-5.6 Sol | openai | $307,200.00 | $30.72 | $3,686,400.00 | 1,050,000 |
| GPT-5.6 Cyber | openai | $768,000.00 | $76.80 | $9,216,000.00 | 1,050,000 |
| GPT-5.5 Standard | openai | $307,200.00 | $30.72 | $3,686,400.00 | 512,000 |
| o3-pro (Frontier Reasoning) | openai | $1,084,800.00 | $108.48 | $13,017,600.00 | 1,000,000 |
| o3 (Reasoning Frontier) | openai | $542,400.00 | $54.24 | $6,508,800.00 | 1,050,000 |
At 8 queries per user/day with GPT-5.5 Pro, the estimated cost is $184.32 per monthly active user (MAU). Total monthly bill for 10,000 Active Users is $1,843,200.00.
Assuming a 65% cache hit rate on repeated system and context tokens, prompt caching saves $1,684,800.00 per month ($20,217,600.00/year) on GPT-5.5 Pro.
With a direct COGS of $184.32 per user/month on GPT-5.5 Pro, charging at least $921.60 per user/month ensures an 80%+ software gross margin.