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  1. Claude Fable 5 and Claude Mythos 5

  2. Introducing Deep Research: An Agent That Uses Reasoning to Synthesize Large Amounts of Online Information and Complete Multi-Step Research Tasks for You. Available to Pro Users Today, Plus and Team Next

  3. Introducing GPT-5.5: A New Class of Intelligence for Real Work § Pro

  4. Introducing Claude Opus 4.8