
What happened
A developer who pays about $5 monthly each for OpenAI and Gemini APIs and 1,200 yen for YouTube Premium expects Google AI Pro's 2,900 yen fee to add only about 100 yen a month.
Why it matters
That gap comes from folding the existing roughly 2,800 yen of monthly API and video spending into the new subscription, so the extra outlay buys additional development capacity at little added cost.
Summaries like this, every morning.
The calculation rests on a simple swap. The developer already spends about 1,600 yen a month on APIs and 1,200 yen on YouTube Premium, roughly 2,800 yen in total. Replacing those with the 2,900 yen Google AI Pro plan leaves a gap of only about 100 yen. That is why the extra development capacity the plan brings in feels like a small add-on rather than a new expense.
The main development environment stays as it is: Codex through ChatGPT Plus at 3,000 yen a month is not being cancelled. What changes is the backup setup. Antigravity's paid usage is meant to cover moments when Codex limits run out, and the free tier and the paid plan differ not only in usage counts but also in which models are available. The API credit is expected to cover both the Sumibi conversion API and benchmarking, with the developer planning to confirm actual usage after switching.
One practical detail stands out: YouTube Premium is not cancelled automatically, so the developer intends to cancel it manually and move to the included Lite plan, which becomes active only once the paid contract starts. From November, the plan is to check whether the API credit covers daily use, whether Antigravity works as a backup, and whether Lite is enough for regular viewing.
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