At 40 requests/user/day (totaling 120,000,000 queries/mo), running AI coding assistant on Grok 4.5 costs $2,851,200.00 / month ($28.512 / 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 |
|---|---|---|---|---|---|
| Grok 4.5 (Current) | xai | $2,851,200.00 | $28.512 | $34,214,400.00 | 500,000 |
| 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 Grok 4.5, the estimated cost is $28.512 per monthly active user (MAU). Total monthly bill for 100,000 Active Users is $2,851,200.00.
Assuming a 60% cache hit rate on repeated system and context tokens, prompt caching saves $1,468,800.00 per month ($17,625,600.00/year) on Grok 4.5.
With a direct COGS of $28.512 per user/month on Grok 4.5, charging at least $142.56 per user/month ensures an 80%+ software gross margin.