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OpenAI Just Upgraded ChatGPT's Default Model—Here's What GPT-5.5 Instant Actually Does

OpenAI Just Upgraded ChatGPT's Default Model—Here's What GPT-5.5 Instant Actually Does

  • Read at Decrypt
  • Tue, 05 May 2026 18:29:40 +0000
OpenAI Just Upgraded ChatGPT's Default Model—Here's What GPT-5.5 Instant Actually Does