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OpenAI

Every release, newest first. Primary source: https://openai.com/news/

• 23 Sept 2026
  Rumor: OpenAI Frontier 3 (demo) in limited testing
  RumorTier 2
• 28 Aug 2026
  OpenAI Frontier 2 (demo) released; Frontier 1 deprecated for 1 December
  ConfirmedTier 1