At 40 requests/user/day (totaling 12,000,000 queries/mo), running AI coding assistant on GPT-4o mini costs $29,520.00 / month ($2.952 / user / mo).
Total expected API invoice for 10,000 Active Users generating 12,000,000 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 (10,000 Active Users) | Cost / User / Mo | Annual Spend | Context Limit |
|---|---|---|---|---|---|
| GPT-4o mini (Current) | openai | $29,520.00 | $2.952 | $354,240.00 | 128,000 |
| GPT-5.6 Luna | openai | $42,048.00 | $4.205 | $504,576.00 | 1,050,000 |
| GPT-5.4 mini | openai | $157,680.00 | $15.768 | $1,892,160.00 | 256,000 |
| GPT-5.4 nano | openai | $43,248.00 | $4.325 | $518,976.00 | 128,000 |
| Claude Haiku 4.5 | anthropic | $186,240.00 | $18.624 | $2,234,880.00 | 1,000,000 |
| Claude 3.5 Haiku | anthropic | $148,992.00 | $14.899 | $1,787,904.00 | 200,000 |
At 40 queries per user/day with GPT-4o mini, the estimated cost is $2.952 per monthly active user (MAU). Total monthly bill for 10,000 Active Users is $29,520.00.
Assuming a 60% cache hit rate on repeated system and context tokens, prompt caching saves $6,480.00 per month ($77,760.00/year) on GPT-4o mini.
With a direct COGS of $2.952 per user/month on GPT-4o mini, charging at least $14.76 per user/month ensures an 80%+ software gross margin.