At 40 requests/user/day (totaling 120,000 queries/mo), running AI coding assistant on GPT-5.6 Terra costs $4,204.80 / month ($42.048 / user / mo).
Total expected API invoice for 100 Active Users generating 120,000 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 Active Users) | Cost / User / Mo | Annual Spend | Context Limit |
|---|---|---|---|---|---|
| GPT-5.6 Terra (Current) | openai | $4,204.80 | $42.048 | $50,457.60 | 1,050,000 |
| GPT-5.4 Workhorse | openai | $5,256.00 | $52.56 | $63,072.00 | 256,000 |
| o3-mini | openai | $2,164.80 | $21.648 | $25,977.60 | 200,000 |
| o4-mini | openai | $1,927.20 | $19.272 | $23,126.40 | 256,000 |
| o1-mini | openai | $2,164.80 | $21.648 | $25,977.60 | 128,000 |
| Claude Sonnet 5 | anthropic | $3,724.80 | $37.248 | $44,697.60 | 1,000,000 |
At 40 queries per user/day with GPT-5.6 Terra, the estimated cost is $42.048 per monthly active user (MAU). Total monthly bill for 100 Active Users is $4,204.80.
Assuming a 60% cache hit rate on repeated system and context tokens, prompt caching saves $1,555.20 per month ($18,662.40/year) on GPT-5.6 Terra.
With a direct COGS of $42.048 per user/month on GPT-5.6 Terra, charging at least $210.24 per user/month ensures an 80%+ software gross margin.