AI Flash Report

GPT-5.1 API price history

GPT-5.1 (OpenAI) currently costs $2.25 per million input tokens and $11.00 per million output tokens. Its price book last changed on 2026-05-11. Confirmed unchanged as of 2026-06-15.

Price timeline

$0 $3.03 $6.05 $9.08 $12.10 2026-04-12 2026-06-15 Input: $2.25/Mtok observed 2026-04-12 Input: $2.25/Mtok observed 2026-05-11 Output: $11.00/Mtok observed 2026-04-12 Output: $11.00/Mtok observed 2026-05-11 Input / Mtok Output / Mtok

Every observed price point

GPT-5.1 dated API price observations
Observed Input / Mtok Output / Mtok Cache read / Mtok Source
$2.25 $11.00 — archive backfill
$2.25 $11.00 $0.12 archive backfill

Dates are when our snapshot observed the price, not necessarily the vendor's announcement date. Prices from each lab's official pricing page, per million tokens.

Full GPT-5.1 model profile →