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

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

More stories

  1. Opus 5.5 — r/ClaudeAI
  2. Optimizing my AI subscriptions: Claude Pro (Opus) vs. ChatGPT Plus vs. Perplexity Pro? — r/AI_Agents
  3. If you had to choose only one, which would you pick? — r/GeminiAI
  4. Can't use Gemini with a VPN? — r/GeminiAI
  5. I asked Claude Code to make it's own version of that guy's "time" video by Astra 5.6 from yesterday. — r/ChatGPT
  6. I was curious — r/OpenAI
  7. Why is Google Antigravity so underrated? — r/AI_Agents
  8. How is Opus 5.5 cheaper AND better than Fable 5.1? Genuinely trying to understand the "how" — r/ArtificialInteligence

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