At 40 requests/user/day (totaling 1,200,000 queries/mo), running AI coding assistant on o3 (Reasoning Frontier) costs $162,240.00 / month ($162.24 / user / mo).
Total expected API invoice for 1,000 Active Users generating 1,200,000 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 (1,000 Active Users) | Cost / User / Mo | Annual Spend | Context Limit |
|---|---|---|---|---|---|
| o3 (Reasoning Frontier) (Current) | openai | $162,240.00 | $162.24 | $1,946,880.00 | 1,050,000 |
| GPT-5.6 Sol | openai | $105,120.00 | $105.12 | $1,261,440.00 | 1,050,000 |
| GPT-5.6 Cyber | openai | $262,800.00 | $262.80 | $3,153,600.00 | 1,050,000 |
| GPT-5.5 Standard | openai | $105,120.00 | $105.12 | $1,261,440.00 | 512,000 |
| GPT-5.5 Pro | openai | $630,720.00 | $630.72 | $7,568,640.00 | 512,000 |
| o3-pro (Frontier Reasoning) | openai | $324,480.00 | $324.48 | $3,893,760.00 | 1,000,000 |
At 40 queries per user/day with o3 (Reasoning Frontier), the estimated cost is $162.24 per monthly active user (MAU). Total monthly bill for 1,000 Active Users is $162,240.00.
Assuming a 60% cache hit rate on repeated system and context tokens, prompt caching saves $77,760.00 per month ($933,120.00/year) on o3 (Reasoning Frontier).
With a direct COGS of $162.24 per user/month on o3 (Reasoning Frontier), charging at least $811.20 per user/month ensures an 80%+ software gross margin.