GPT-6 Astra Fast Mode speed increased to 2x, usage remains 2.5x

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Alex Getman @alexgetmancom · 6 Sep 2026, 11:49 UTC · Updated 31 Oct 2026, 22:26 UTC

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Correction: I got the calculation in this post wrong. A 2.5× usage multiplier means 150% more usage, not 25%. Corrected calculation: https://alexgetman.com/403/gpt-6-astra-fast-mode-quietly-went-from-1-5x-to-2x-speed-with-the-same-2-5x-usag/

GPT-6 Astra Fast mode quietly went from 1.5x to 2x speed, with usage still at 2.5x

So you’re getting double the speed for just 25% extra usage.

At this point, there’s very little reason to turn Fast mode off.

Screenshot of a JSON file change: the 'Fast' mode description updated from '1.5x speed, increased usage' to '2x speed, increased usage'.

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