At 6 requests/user/day (totaling 18,000 queries/mo), running Customer support chatbot on Claude Opus 5 costs $274.05 / month ($2.74 / user / mo).
Total expected API invoice for 100 Active Users generating 18,000 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 (100 Active Users) | Cost / User / Mo | Annual Spend | Context Limit |
|---|---|---|---|---|---|
| Claude Opus 5 (Current) | anthropic | $274.05 | $2.74 | $3,288.60 | 1,000,000 |
| GPT-5.6 Sol | openai | $305.55 | $3.056 | $3,666.60 | 1,050,000 |
| GPT-5.6 Cyber | openai | $763.875 | $7.639 | $9,166.50 | 1,050,000 |
| GPT-5.5 Standard | openai | $305.55 | $3.056 | $3,666.60 | 512,000 |
| GPT-5.5 Pro | openai | $1,833.30 | $18.333 | $21,999.60 | 512,000 |
| o3-pro (Frontier Reasoning) | openai | $970.20 | $9.702 | $11,642.40 | 1,000,000 |
At 6 queries per user/day with Claude Opus 5, the estimated cost is $2.74 per monthly active user (MAU). Total monthly bill for 100 Active Users is $274.05.
Assuming a 70% cache hit rate on repeated system and context tokens, prompt caching saves $198.45 per month ($2,381.40/year) on Claude Opus 5.
With a direct COGS of $2.74 per user/month on Claude Opus 5, charging at least $13.702 per user/month ensures an 80%+ software gross margin.