GPT-5.2 Pro API cost calculator
GPT-5.2 Pro (OpenAI) is priced at $21 per million input tokens, $21 for cached input, and $168 per million output tokens — half that through the Batch API. Verified 2026-09-17 against OpenAI's pricing page.
What GPT-5.2 Pro 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. | $0.130 | $651 | $19,530 |
| RAG over documentsRetrieved context dominates — 12k in, 500 out, 30% cached. | $0.336 | $504 | $15,120 |
| Coding agentGrowing context every turn — 20k in, 1.5k out, 80% cached. | $0.672 | $2,016 | $60,480 |
| Batch classificationTiny prompts at volume through the Batch API — 800 in, 20 out. | $0.010 | $2,016 | $60,480 |
Its blast radius when an agent loops
The coding-agent workload above at 30 requests a minute — $1,210 an hour — priced at each point a team usually finds out:
Hourly alert
$1,210
Next morning
$29,030
After a weekend
$72,576
Monthly invoice
$870,912