GPT-6 Astra Ultrafast measured well below advertised speed

Hakm @hakmgptOriginally posted 2026.10.05

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I hope that GPT-6.1 SOL ultrafast can be the same speed of the normal opus 5.5 :) I’ve been watching the speed of the GPT-6 Astra for the past two days with Ultrafast. It usually won’t give you more than 90 TP/s. It can reach 140 sometimes, but only rarely. It’s just not like what they promised (350 TP/s)

This post quotes another post: “Users note Claude Opus 5.5 outpaces GPT-6 Astra fast and GPT-6 SOL fast”