At 40 requests/user/day (totaling 60,000 queries/mo), running AI coding assistant on Mistral Medium 3.5 costs $1,396.80 / month ($27.936 / user / mo).
Total expected API invoice for 50 Active Users generating 60,000 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 (50 Active Users) | Cost / User / Mo | Annual Spend | Context Limit |
|---|---|---|---|---|---|
| Mistral Medium 3.5 (Current) | mistral | $1,396.80 | $27.936 | $16,761.60 | 256,000 |
| GPT-5.6 Sol | openai | $5,256.00 | $105.12 | $63,072.00 | 1,050,000 |
| GPT-5.6 Cyber | openai | $13,140.00 | $262.80 | $157,680.00 | 1,050,000 |
| GPT-5.5 Standard | openai | $5,256.00 | $105.12 | $63,072.00 | 512,000 |
| GPT-5.5 Pro | openai | $31,536.00 | $630.72 | $378,432.00 | 512,000 |
| o3-pro (Frontier Reasoning) | openai | $16,224.00 | $324.48 | $194,688.00 | 1,000,000 |
At 40 queries per user/day with Mistral Medium 3.5, the estimated cost is $27.936 per monthly active user (MAU). Total monthly bill for 50 Active Users is $1,396.80.
Assuming a 60% cache hit rate on repeated system and context tokens, prompt caching saves $583.20 per month ($6,998.40/year) on Mistral Medium 3.5.
With a direct COGS of $27.936 per user/month on Mistral Medium 3.5, charging at least $139.68 per user/month ensures an 80%+ software gross margin.