AI Token Cost Calculator
Estimate what a fleet of AI agents costs per month on current Claude API pricing, and what prompt caching and a memory layer each change.
Last Updated: August 2026
| Scenario | Monthly cost | Annual |
|---|---|---|
| BaselineEvery request pays full input and output rates. | $3,300 | $39,600 |
| With prompt caching40% of input billed at the model's published cache-read rate. | $2,388 | $28,656 |
| With a memory layer (token reduction only)Applies the 41.2% token reduction measured on Terminal-Bench 2.1. | $1,940 | $23,285 |
| With a memory layer (full measured effect)Applies the 72.6% cost reduction measured on Terminal-Bench 2.1, where fewer retries and shorter runs compound with fewer tokens. | $904.20 | $10,850 |
30,000 model calls per month at the rates Anthropic publishes as of October 2026: Opus 5.5 at $4 input and $20 output per million tokens, Sonnet 5.5 at $2 and $10, Haiku 5.5 at $0.10 and $0.50 for prompts up to 100,000 tokens ($0.50 and $2.50 above that), Haiku 4.5 at $1 and $5, Fable 5.1 at $10 and $50, and each model's published cache-read rate. Batch processing halves both rates for non-interactive work and is not modeled here.
The memory-layer rows use figures from Sentra's published Terminal-Bench 2.1 evaluation: 41.2% fewer tokens and 72.6% lower model cost across 445 trials against the public baseline. That was a coding-agent workload; your reduction depends on how much of your context is re-derived per call. Prompt caching and a memory layer compose, since one lowers the price of stable tokens and the other removes re-sent context.