At 6 requests/user/day (totaling 9,000,000 queries/mo), running Customer support chatbot on DeepSeek V4 Flash costs $8,624.70 / month ($0.1725 / user / mo).
Total expected API invoice for 50,000 Active Users generating 9,000,000 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 (50,000 Active Users) | Cost / User / Mo | Annual Spend | Context Limit |
|---|---|---|---|---|---|
| DeepSeek V4 Flash (Current) | deepseek | $8,624.70 | $0.1725 | $103,496.40 | 1,000,000 |
| GPT-5.6 Luna | openai | $6,111.00 | $0.1222 | $73,332.00 | 1,050,000 |
| GPT-5.4 mini | openai | $22,916.25 | $0.4583 | $274,995.00 | 256,000 |
| GPT-5.4 nano | openai | $6,268.50 | $0.1254 | $75,222.00 | 128,000 |
| GPT-4o mini | openai | $4,961.25 | $0.0992 | $59,535.00 | 128,000 |
| Claude Haiku 4.5 | anthropic | $27,405.00 | $0.5481 | $328,860.00 | 1,000,000 |
At 6 queries per user/day with DeepSeek V4 Flash, the estimated cost is $0.1725 per monthly active user (MAU). Total monthly bill for 50,000 Active Users is $8,624.70.
Assuming a 70% cache hit rate on repeated system and context tokens, prompt caching saves $9,393.30 per month ($112,719.60/year) on DeepSeek V4 Flash.
With a direct COGS of $0.1725 per user/month on DeepSeek V4 Flash, charging at least $0.8625 per user/month ensures an 80%+ software gross margin.