At 6 requests/user/day (totaling 1,800,000 queries/mo), running Customer support chatbot on OpenRouter Auto-Best Router costs $8,190.00 / month ($0.819 / user / mo).
Customer support chatbot for a 10,000 active users (scale-up saas) audience means 60,000 requests per day on average, each carrying 3,500 input and 350 output tokens at a 70% cacheable share — so the effective per-request cost on OpenRouter Auto-Best Router is $0.00455, of which $0.00/mo comes back from prompt caching. Per active user that's $0.819/mo — the number to hold against your pricing tier and gross margin. Charging at least $4.095/user/mo keeps gross margin at or above 80%.
Quick answer
For 10,000 Active Users, Customer support chatbot on OpenRouter Auto-Best Router is modeled at 1,800,000 requests per month, costing $8,190.00 per month or $0.819 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 1,800,000 queries.
Direct inference cost per MAU to model your SaaS pricing tiers and gross margins.
Savings generated by exploiting 70% cache hits on prompt context.
| Model | Provider | Monthly Spend (10,000 Active Users) | Cost / User / Mo | Annual Spend | Context Limit |
|---|---|---|---|---|---|
| OpenRouter Auto-Best Router (Current) | openrouter | $8,190.00 | $0.819 | $98,280.00 | 1,000,000 |
| GPT-5.6 Terra | openai | $12,222.00 | $1.222 | $146,664.00 | 1,050,000 |
| GPT-5.4 Workhorse | openai | $15,277.50 | $1.528 | $183,330.00 | 256,000 |
| o3-mini | openai | $7,276.50 | $0.7277 | $87,318.00 | 200,000 |
| o4-mini | openai | $6,063.75 | $0.6064 | $72,765.00 | 256,000 |
| o1-mini | openai | $7,276.50 | $0.7277 | $87,318.00 | 128,000 |
At 6 queries per user/day with OpenRouter Auto-Best Router, the estimated cost is $0.819 per monthly active user (MAU). Total monthly bill for 10,000 Active Users is $8,190.00.
Assuming a 70% cache hit rate on repeated system and context tokens, prompt caching saves $0.00 per month ($0.00/year) on OpenRouter Auto-Best Router.
With a direct COGS of $0.819 per user/month on OpenRouter Auto-Best Router, charging at least $4.095 per user/month ensures an 80%+ software gross margin.