OpenAI· GPT / ChatGPT / APIModel update

GPT-5.5 Instant: smarter, clearer, and more personalized

GPT-5.5 Instant is a model update that becomes ChatGPT's default model, offering smarter, more accurate answers, reduced hallucinations, and improved personalization controls.

From the source

GPT-5.5 Instant updates ChatGPT’s default model with smarter, more accurate answers, reduced hallucinations, and improved personalization controls.

openai.com

Announced

05 May 2026 10:00 UTC

Detected

03 Aug 2026 21:11 UTC (+90d after)