At 40 requests/user/day (totaling 120,000 queries/mo), running AI coding assistant on GPT-5.5 Pro costs $63,072.00 / month ($630.72 / user / mo).
Total expected API invoice for 100 Active Users generating 120,000 queries.
Direct inference cost per MAU to model your SaaS pricing tiers and gross margins.
Savings generated by exploiting 60% cache hits on prompt context.
| Model | Provider | Monthly Spend (100 Active Users) | Cost / User / Mo | Annual Spend | Context Limit |
|---|---|---|---|---|---|
| GPT-5.5 Pro (Current) | openai | $63,072.00 | $630.72 | $756,864.00 | 512,000 |
| GPT-5.6 Sol | openai | $10,512.00 | $105.12 | $126,144.00 | 1,050,000 |
| GPT-5.6 Cyber | openai | $26,280.00 | $262.80 | $315,360.00 | 1,050,000 |
| GPT-5.5 Standard | openai | $10,512.00 | $105.12 | $126,144.00 | 512,000 |
| o3-pro (Frontier Reasoning) | openai | $32,448.00 | $324.48 | $389,376.00 | 1,000,000 |
| o3 (Reasoning Frontier) | openai | $16,224.00 | $162.24 | $194,688.00 | 1,050,000 |
At 40 queries per user/day with GPT-5.5 Pro, the estimated cost is $630.72 per monthly active user (MAU). Total monthly bill for 100 Active Users is $63,072.00.
Assuming a 60% cache hit rate on repeated system and context tokens, prompt caching saves $23,328.00 per month ($279,936.00/year) on GPT-5.5 Pro.
With a direct COGS of $630.72 per user/month on GPT-5.5 Pro, charging at least $3,153.60 per user/month ensures an 80%+ software gross margin.