At 6 requests/user/day (totaling 450,000 queries/mo), running Customer support chatbot on Qwen3 Coder Flash (OpenRouter) costs $288.698 / month ($0.1155 / user / mo).
Customer support chatbot for a 2,500 active users (series a product) audience means 15,000 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 Qwen3 Coder Flash (OpenRouter) is $0.000642, of which $171.99/mo comes back from prompt caching. Per active user that's $0.1155/mo — the number to hold against your pricing tier and gross margin. Charging at least $0.5774/user/mo keeps gross margin at or above 80%.
Quick answer
For 2,500 Active Users, Customer support chatbot on Qwen3 Coder Flash (OpenRouter) is modeled at 450,000 requests per month, costing $288.698 per month or $0.1155 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 450,000 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 (2,500 Active Users) | Cost / User / Mo | Annual Spend | Context Limit |
|---|---|---|---|---|---|
| Qwen3 Coder Flash (OpenRouter) (Current) | qwen | $288.698 | $0.1155 | $3,464.37 | 1,000,000 |
| GPT-5.3 Codex | openai | $3,224.813 | $1.29 | $38,697.75 | 256,000 |
| DeepSeek Coder V2.5 | deepseek | $125.685 | $0.0503 | $1,508.22 | 128,000 |
| Codestral 2501 | mistral | $316.575 | $0.1266 | $3,798.90 | 256,000 |
| Grok Build 0.1 | xai | $1,008.00 | $0.4032 | $12,096.00 | 256,000 |
| Qwen 2.5 Coder 32B | qwen | $211.05 | $0.0844 | $2,532.60 | 128,000 |
At 6 queries per user/day with Qwen3 Coder Flash (OpenRouter), the estimated cost is $0.1155 per monthly active user (MAU). Total monthly bill for 2,500 Active Users is $288.698.
Assuming a 70% cache hit rate on repeated system and context tokens, prompt caching saves $171.99 per month ($2,063.88/year) on Qwen3 Coder Flash (OpenRouter).
With a direct COGS of $0.1155 per user/month on Qwen3 Coder Flash (OpenRouter), charging at least $0.5774 per user/month ensures an 80%+ software gross margin.