Pricing
PromptBus itself is free and open source. You only pay for the Anthropic API calls — but PromptBus helps you use cheaper models whenever possible.
Model pricing
| Model | Input / 1M tokens | Output / 1M tokens | Tier |
|---|---|---|---|
| claude-fable-5 | $10 | $50 | Premium |
| claude-mythos-5 | $8 | $40 | Premium |
| claude-mythos-preview | $8 | $40 | Premium |
| claude-opus-4-8 | $5 | $25 | High |
| claude-opus-4-7 | $5 | $25 | High |
| claude-opus-4-6 | $5 | $25 | High |
| claude-opus-4-5 | $5 | $25 | High |
| claude-opus-4-5-20251101 | $5 | $25 | High |
| claude-opus-4-1 | $5 | $25 | High |
| claude-opus-4-1-20250805 | $5 | $25 | High |
| claude-sonnet-5 | $3 | $15 | Standard |
| claude-sonnet-4-6 | $3 | $15 | Standard |
| claude-sonnet-4-5 | $3 | $15 | Standard |
| claude-sonnet-4-5-20250929 | $3 | $15 | Standard |
| claude-haiku-4-5 | $1 | $5 | Economy |
| claude-haiku-4-5-20251001 | $1 | $5 | Economy |
Estimated monthly savings
Assuming ~70% of requests are candidates for downgrade.
Daily code review (50 queries/day)
Save 83%Haiku only
$125/mo
Sonnet only
$750/mo
With PromptBus
$125/mo
Heavy development (200 queries/day)
Save 83%Haiku only
$500/mo
Sonnet only
$3000/mo
With PromptBus
$500/mo
Team of 5 (1000 queries/day)
Save 83%Haiku only
$2500/mo
Sonnet only
$15000/mo
With PromptBus
$2500/mo