GPT-4.1 mini API cost calculator
GPT-4.1 mini (OpenAI) is priced at $0.4 per million input tokens, $0.1 for cached input, and $1.60 per million output tokens — half that through the Batch API. Verified 2026-09-17 against OpenAI's pricing page.
What GPT-4.1 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. | $0.0013 | $6.50 | $195 |
| RAG over documentsRetrieved context dominates — 12k in, 500 out, 30% cached. | $0.0045 | $6.78 | $203 |
| Coding agentGrowing context every turn — 20k in, 1.5k out, 80% cached. | $0.0056 | $16.80 | $504 |
| Batch classificationTiny prompts at volume through the Batch API — 800 in, 20 out. | $0.0002 | $35.20 | $1,056 |
Its blast radius when an agent loops
The coding-agent workload above at 30 requests a minute — $10.08 an hour — priced at each point a team usually finds out:
Hourly alert
$10.08
Next morning
$242
After a weekend
$605
Monthly invoice
$7,258