At 40 requests/user/day (totaling 120,000,000 queries/mo), running AI coding assistant on Gemini 3.6 Flash costs $2,793,600.00 / month ($27.936 / user / mo).
Total expected API invoice for 100,000 Active Users generating 120,000,000 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 (100,000 Active Users) | Cost / User / Mo | Annual Spend | Context Limit |
|---|---|---|---|---|---|
| Gemini 3.6 Flash (Current) | $2,793,600.00 | $27.936 | $33,523,200.00 | 1,000,000 | |
| GPT-5.6 Terra | openai | $4,204,800.00 | $42.048 | $50,457,600.00 | 1,050,000 |
| GPT-5.4 Workhorse | openai | $5,256,000.00 | $52.56 | $63,072,000.00 | 256,000 |
| o3-mini | openai | $2,164,800.00 | $21.648 | $25,977,600.00 | 200,000 |
| o4-mini | openai | $1,927,200.00 | $19.272 | $23,126,400.00 | 256,000 |
| o1-mini | openai | $2,164,800.00 | $21.648 | $25,977,600.00 | 128,000 |
At 40 queries per user/day with Gemini 3.6 Flash, the estimated cost is $27.936 per monthly active user (MAU). Total monthly bill for 100,000 Active Users is $2,793,600.00.
Assuming a 60% cache hit rate on repeated system and context tokens, prompt caching saves $1,166,400.00 per month ($13,996,800.00/year) on Gemini 3.6 Flash.
With a direct COGS of $27.936 per user/month on Gemini 3.6 Flash, charging at least $139.68 per user/month ensures an 80%+ software gross margin.