Claude Opus 4.8 API cost calculator
Claude Opus 4.8 (Anthropic) is priced at $5 per million input tokens, $0.5 for cached input, and $25 per million output tokens — half that through the Batch API. Verified 2026-09-17 against Anthropic's pricing page.
What Claude Opus 4.8 costs for common workloads
| Workload | Per request | Per day | Per month |
|---|---|---|---|
| Support chatbotShort turns with a reused system prompt — 3k in, 400 out, 60% cached. | $0.017 | $84.50 | $2,535 |
| RAG over documentsRetrieved context dominates — 12k in, 500 out, 30% cached. | $0.056 | $84.45 | $2,534 |
| Coding agentGrowing context every turn — 20k in, 1.5k out, 80% cached. | $0.066 | $197 | $5,895 |
| Batch classificationTiny prompts at volume through the Batch API — 800 in, 20 out. | $0.0023 | $450 | $13,500 |
Its blast radius when an agent loops
The coding-agent workload above at 30 requests a minute — $118 an hour — priced at each point a team usually finds out:
Hourly alert
$118
Next morning
$2,830
After a weekend
$7,074
Monthly invoice
$84,888