Opus 5.5 wins the day as GPT-6 Sol skips ChatGPT, sparking model debate
koltregaskes · x · 2026-09-23
koltregaskes recaps yesterday's model releases: Opus 5.5 is a big hit — faster, more intelligent and a better writer — while GPT-6 Sol (and Luna) didn't arrive in ChatGPT, only in Work and Codex, and appears to be an optimized version of 5.6. Quoting @dedene: if Opus 5.5 beats Fable 5.1 on intelligence, speed and cost, where does Fable still make sense?
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