OpenAI upgrades GPT-5.5, as it plans to retire legacy ChatGPT models
OpenAI upgrades GPT-5.5, as it plans to retire legacy ChatGPT models By Mayank Parmar June 2, 2026 06:44 PM OpenAI says it's rolling out a new update that improves the existing GPT-5.5 Instant model and retires multiple legacy models, including o3. …