At 15 requests/user/day (totaling 1,125,000 queries/mo), running Translation on o3-pro (Frontier Reasoning) costs $592,312.50 / month ($236.925 / user / mo).
Translation for a 2,500 active users (series a product) audience means 37,500 requests per day on average, each carrying 5,000 input and 5,500 output tokens at a 15% cacheable share — so the effective per-request cost on o3-pro (Frontier Reasoning) is $0.5265, of which $15,187.50/mo comes back from prompt caching. Per active user that's $236.925/mo — the number to hold against your pricing tier and gross margin. Charging at least $1,184.625/user/mo keeps gross margin at or above 80%.
Quick answer
For 2,500 Active Users, Translation on o3-pro (Frontier Reasoning) is modeled at 1,125,000 requests per month, costing $592,312.50 per month or $236.925 per active user.
Method & trust
This projection combines the selected active-user tier, requests per user per day, input/output tokens per request, and the modeled cache share. It is an operating estimate, not a provider invoice; production traffic and retries should be measured against it.
Total expected API invoice for 2,500 Active Users generating 1,125,000 queries.
Direct inference cost per MAU to model your SaaS pricing tiers and gross margins.
Savings generated by exploiting 15% cache hits on prompt context.
| Model | Provider | Monthly Spend (2,500 Active Users) | Cost / User / Mo | Annual Spend | Context Limit |
|---|---|---|---|---|---|
| o3-pro (Frontier Reasoning) (Current) | openai | $592,312.50 | $236.925 | $7,107,750.00 | 1,000,000 |
| GPT-5.6 Sol | openai | $209,953.125 | $83.981 | $2,519,437.50 | 1,050,000 |
| GPT-5.6 Cyber | openai | $524,882.813 | $209.953 | $6,298,593.75 | 1,050,000 |
| GPT-5.5 Standard | openai | $209,953.125 | $83.981 | $2,519,437.50 | 512,000 |
| GPT-5.5 Pro | openai | $1,259,718.75 | $503.888 | $15,116,625.00 | 512,000 |
| o3 (Reasoning Frontier) | openai | $296,156.25 | $118.463 | $3,553,875.00 | 1,050,000 |
At 15 queries per user/day with o3-pro (Frontier Reasoning), the estimated cost is $236.925 per monthly active user (MAU). Total monthly bill for 2,500 Active Users is $592,312.50.
Assuming a 15% cache hit rate on repeated system and context tokens, prompt caching saves $15,187.50 per month ($182,250.00/year) on o3-pro (Frontier Reasoning).
With a direct COGS of $236.925 per user/month on o3-pro (Frontier Reasoning), charging at least $1,184.625 per user/month ensures an 80%+ software gross margin.