At 10 requests/user/day (totaling 3,000,000 queries/mo), running RAG / search-augmented answers on Gemini 2.5 Pro costs $33,750.00 / month ($3.375 / user / mo).
RAG / search-augmented answers for a 10,000 active users (scale-up saas) audience means 100,000 requests per day on average, each carrying 8,000 input and 500 output tokens at a 50% cacheable share — so the effective per-request cost on Gemini 2.5 Pro is $0.0113, of which $11,250.00/mo comes back from prompt caching. Per active user that's $3.375/mo — the number to hold against your pricing tier and gross margin. Charging at least $16.875/user/mo keeps gross margin at or above 80%.
Quick answer
For 10,000 Active Users, RAG / search-augmented answers on Gemini 2.5 Pro is modeled at 3,000,000 requests per month, costing $33,750.00 per month or $3.375 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 10,000 Active Users generating 3,000,000 queries.
Direct inference cost per MAU to model your SaaS pricing tiers and gross margins.
Savings generated by exploiting 50% cache hits on prompt context.
| Model | Provider | Monthly Spend (10,000 Active Users) | Cost / User / Mo | Annual Spend | Context Limit |
|---|---|---|---|---|---|
| Gemini 2.5 Pro (Current) | $33,750.00 | $3.375 | $405,000.00 | 1,000,000 | |
| GPT-5.6 Terra | openai | $44,400.00 | $4.44 | $532,800.00 | 1,050,000 |
| GPT-5.4 Workhorse | openai | $55,500.00 | $5.55 | $666,000.00 | 256,000 |
| o3-mini | openai | $26,400.00 | $2.64 | $316,800.00 | 200,000 |
| o4-mini | openai | $23,100.00 | $2.31 | $277,200.00 | 256,000 |
| o1-mini | openai | $26,400.00 | $2.64 | $316,800.00 | 128,000 |
At 10 queries per user/day with Gemini 2.5 Pro, the estimated cost is $3.375 per monthly active user (MAU). Total monthly bill for 10,000 Active Users is $33,750.00.
Assuming a 50% cache hit rate on repeated system and context tokens, prompt caching saves $11,250.00 per month ($135,000.00/year) on Gemini 2.5 Pro.
With a direct COGS of $3.375 per user/month on Gemini 2.5 Pro, charging at least $16.875 per user/month ensures an 80%+ software gross margin.