AI Flash Report

Step 3.5 Flash 2603 API price history

Step 3.5 Flash 2603 (StepFun) is free to use — released under Proprietary. Its price book last changed on 2026-06-08. Confirmed unchanged as of 2026-06-15.

Price timeline

$0 $0.0027500000000000003 $0.0055000000000000005 $0.00825 $0.01 2026-05-11 2026-06-15 Input: Free/Mtok observed 2026-05-11 Input: Free/Mtok observed 2026-06-08 Output: Free/Mtok observed 2026-05-11 Output: Free/Mtok observed 2026-06-08 Input / Mtok Output / Mtok

Every observed price point

Step 3.5 Flash 2603 dated API price observations
Observed Input / Mtok Output / Mtok Cache read / Mtok Source
Free Free — archive backfill
Free Free $0.02 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 Step 3.5 Flash 2603 model profile →