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GPT-6 and Claude Opus 5.5 shipped days apart — here's what actually happened this week in AI

This story is from 2026-09-28. It is preserved in the archive; the latest stories are on the live feed.

While US markets closed the week higher (Dow +478 points, Nasdaq +0.48%), the AI industry just had its biggest news week of 2026. Everything below is verified against Hacker News discussion data (Sept 18–26). 1. Claude Opus 5.5 vs GPT-6: the same-week showdown Anthropic shipped Claude Opus 5.5 and…

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  1. 2026-09-28 05:39 · DEV Community — Machine Learning
    GPT-6 and Claude Opus 5.5 shipped days apart — here's what actually happened this week in AI

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