At 10 requests/user/day (totaling 150,000 queries/mo), running RAG / search-augmented answers on Muse Spark 1.2 Contributor (OpenRouter) costs $135.00 / month ($0.27 / user / mo).
RAG / search-augmented answers for a 500 active users (early growth) audience means 5,000 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 Muse Spark 1.2 Contributor (OpenRouter) is $0.0009, of which $0.00/mo comes back from prompt caching. Per active user that's $0.27/mo — the number to hold against your pricing tier and gross margin. Charging at least $1.35/user/mo keeps gross margin at or above 80%.
Quick answer
For 500 Active Users, RAG / search-augmented answers on Muse Spark 1.2 Contributor (OpenRouter) is modeled at 150,000 requests per month, costing $135.00 per month or $0.27 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 500 Active Users generating 150,000 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 (500 Active Users) | Cost / User / Mo | Annual Spend | Context Limit |
|---|---|---|---|---|---|
| Muse Spark 1.2 Contributor (OpenRouter) (Current) | meta | $135.00 | $0.27 | $1,620.00 | 1,050,000 |
| GPT-5.6 Luna | openai | $222.00 | $0.444 | $2,664.00 | 1,050,000 |
| GPT-5.4 mini | openai | $832.50 | $1.665 | $9,990.00 | 256,000 |
| GPT-5.4 nano | openai | $225.75 | $0.4515 | $2,709.00 | 128,000 |
| GPT-4o mini | openai | $180.00 | $0.36 | $2,160.00 | 128,000 |
| Claude Haiku 4.5 | anthropic | $1,035.00 | $2.07 | $12,420.00 | 1,000,000 |
At 10 queries per user/day with Muse Spark 1.2 Contributor (OpenRouter), the estimated cost is $0.27 per monthly active user (MAU). Total monthly bill for 500 Active Users is $135.00.
Assuming a 50% cache hit rate on repeated system and context tokens, prompt caching saves $0.00 per month ($0.00/year) on Muse Spark 1.2 Contributor (OpenRouter).
With a direct COGS of $0.27 per user/month on Muse Spark 1.2 Contributor (OpenRouter), charging at least $1.35 per user/month ensures an 80%+ software gross margin.