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.
GPT-5.5 Instant was released on April 23, and it has made significant progress over the past few weeks, particularly in May 2026.
Now, in an updated document, OpenAI quietly confirmed that it has improved the quality of GPT-5.5, which means it'll now respond more accurately and use a better style for its answers.
OpenAI is also reducing long and bullet-heavy responses in an attempt to make GPT sound more human.
These changes mean GPT responses will now be easier to read and more natural in everyday conversation.
