[AI]■ STORY TIMELINE
OPENAI UPGRADES GPT-5.5, RETIRES LEGACY MODELS
OpenAI has released an update to its GPT-5.5 Instant model while announcing plans to discontinue multiple legacy models, including o3.
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OpenAI says it's rolling out a new update that improves the existing GPT-5.5 Instant model, and this move comes ahead of…