At 40 requests/user/day (totaling 120,000,000 queries/mo), running AI coding assistant on GPT-5.4 mini costs $1,576,800.00 / month ($15.768 / 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 |
|---|---|---|---|---|---|
| GPT-5.4 mini (Current) | openai | $1,576,800.00 | $15.768 | $18,921,600.00 | 256,000 |
| GPT-5.6 Luna | openai | $420,480.00 | $4.205 | $5,045,760.00 | 1,050,000 |
| GPT-5.4 nano | openai | $432,480.00 | $4.325 | $5,189,760.00 | 128,000 |
| GPT-4o mini | openai | $295,200.00 | $2.952 | $3,542,400.00 | 128,000 |
| Claude Haiku 4.5 | anthropic | $1,862,400.00 | $18.624 | $22,348,800.00 | 1,000,000 |
| Claude 3.5 Haiku | anthropic | $1,489,920.00 | $14.899 | $17,879,040.00 | 200,000 |
At 40 queries per user/day with GPT-5.4 mini, the estimated cost is $15.768 per monthly active user (MAU). Total monthly bill for 100,000 Active Users is $1,576,800.00.
Assuming a 60% cache hit rate on repeated system and context tokens, prompt caching saves $583,200.00 per month ($6,998,400.00/year) on GPT-5.4 mini.
With a direct COGS of $15.768 per user/month on GPT-5.4 mini, charging at least $78.84 per user/month ensures an 80%+ software gross margin.