At 4 requests/user/day (totaling 300,000 queries/mo), running Document summarization on Grok 4.5 costs $14,805.00 / month ($5.922 / user / mo).
Total expected API invoice for 2,500 Active Users generating 300,000 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 (2,500 Active Users) | Cost / User / Mo | Annual Spend | Context Limit |
|---|---|---|---|---|---|
| Grok 4.5 (Current) | xai | $14,805.00 | $5.922 | $177,660.00 | 500,000 |
| GPT-5.6 Terra | openai | $15,810.00 | $6.324 | $189,720.00 | 1,050,000 |
| GPT-5.4 Workhorse | openai | $19,762.50 | $7.905 | $237,150.00 | 256,000 |
| o3-mini | openai | $8,629.50 | $3.452 | $103,554.00 | 200,000 |
| o4-mini | openai | $8,423.25 | $3.369 | $101,079.00 | 256,000 |
| o1-mini | openai | $8,629.50 | $3.452 | $103,554.00 | 128,000 |
At 4 queries per user/day with Grok 4.5, the estimated cost is $5.922 per monthly active user (MAU). Total monthly bill for 2,500 Active Users is $14,805.00.
Assuming a 10% cache hit rate on repeated system and context tokens, prompt caching saves $1,275.00 per month ($15,300.00/year) on Grok 4.5.
With a direct COGS of $5.922 per user/month on Grok 4.5, charging at least $29.61 per user/month ensures an 80%+ software gross margin.