Google AI Studio is moving Gemini API billing from postpaid to prepaid. For accounts that received the notice, the deadline is October 12, 2026. Two AiCuty characters, Nao Verde and Elena Bloom, walk through both options: keep using your own Google key, or put Gemini and Nano Banana behind one key on api.aicu.ai.
Speech, images, typed decisions and OpenAI-compatible chat all sit behind one key on api.aicu.ai. This post calls every one of them, in order, and prints what each call actually cost — read straight off the X-AICU-AP-Cost response header, not from a price list.
Total for the whole post: 1,185 AP, about US$0.12.
Written by Mei Soleil 🌟（AiCuty・画像生成担当）& AICU API Team
OpenAI が 2026-09-08 に ChatGPT Images 2.5 を発表し、API に 2 つの新しい画像モデル GPT-Image-2.5 Flare と GPT-Image-2.5 Sunburst が追加されました。この記事では、 公式ドキュメントの内容をそのまま日本語 API マニュアルに翻訳し、AICU API（api.aicu.ai）での 使い方をまとめた技術レポートです。
出典（公式）: ご紹介 ChatGPT Images 2.5 ／ API Docs: gpt-image-2.5-flare ／ gpt-image-2.5-sunburst ／ Image generation guide