At 4 requests/user/day (totaling 60,000 queries/mo), running Document summarization on GPT-4o mini costs $235.35 / month ($0.4707 / user / mo).
Total expected API invoice for 500 Active Users generating 60,000 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 (500 Active Users) | Cost / User / Mo | Annual Spend | Context Limit |
|---|---|---|---|---|---|
| GPT-4o mini (Current) | openai | $235.35 | $0.4707 | $2,824.20 | 128,000 |
| GPT-5.6 Luna | openai | $316.20 | $0.6324 | $3,794.40 | 1,050,000 |
| GPT-5.4 mini | openai | $1,185.75 | $2.372 | $14,229.00 | 256,000 |
| GPT-5.4 nano | openai | $318.00 | $0.636 | $3,816.00 | 128,000 |
| Claude Haiku 4.5 | anthropic | $1,545.00 | $3.09 | $18,540.00 | 1,000,000 |
| Claude 3.5 Haiku | anthropic | $1,236.00 | $2.472 | $14,832.00 | 200,000 |
At 4 queries per user/day with GPT-4o mini, the estimated cost is $0.4707 per monthly active user (MAU). Total monthly bill for 500 Active Users is $235.35.
Assuming a 10% cache hit rate on repeated system and context tokens, prompt caching saves $11.25 per month ($135.00/year) on GPT-4o mini.
With a direct COGS of $0.4707 per user/month on GPT-4o mini, charging at least $2.354 per user/month ensures an 80%+ software gross margin.