Astra ultrafast rebuilds an app from scratch in ~3 mins using 10% of a $500/mo plan

OpenAIDevs · x · 2026-10-01

At OpenAI's DevDay, developer davis7 ran the Astra coding agent in ultrafast mode (medium reasoning) to rebuild a 1:1 app from scratch on the modretro device handed to attendees:

His take: ultrafast is rarely needed, but it's genuinely impressive when you do use it.

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