GPT-5.4 mini API cost calculator
GPT-5.4 mini (OpenAI) is priced at $0.75 per million input tokens, $0.075 for cached input, and $4.50 per million output tokens — half that through the Batch API. Verified 2026-09-17 against OpenAI's pricing page.
What GPT-5.4 mini 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. | $0.0028 | $14.17 | $425 |
| RAG over documentsRetrieved context dominates — 12k in, 500 out, 30% cached. | $0.0088 | $13.23 | $397 |
| Coding agentGrowing context every turn — 20k in, 1.5k out, 80% cached. | $0.011 | $32.85 | $986 |
| Batch classificationTiny prompts at volume through the Batch API — 800 in, 20 out. | $0.0003 | $69.00 | $2,070 |
Its blast radius when an agent loops
The coding-agent workload above at 30 requests a minute — $19.71 an hour — priced at each point a team usually finds out:
Hourly alert
$19.71
Next morning
$473
After a weekend
$1,183
Monthly invoice
$14,191