AI Agent 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. | $4,125 | $49,500 |
| With prompt caching40% of input billed at the 0.1x cache-read rate (Anthropic's published multiplier). | $3,045 | $36,540 |
| With a memory layer (token reduction only)Applies the 41.2% token reduction measured on Terminal-Bench 2.1. | $2,426 | $29,106 |
| 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. | $1,130 | $13,563 |
30,000 model calls per month at the rates Anthropic publishes as of August 2026: Opus 5 at $5 input and $25 output per million tokens, Sonnet 5 at $2 and $10, Haiku 4.5 at $1 and $5, Fable 5 at $10 and $50, cache reads at 0.1x input. 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.