ChatGPT Response Times Hit 60+ Minutes in Suspected GPT-5.6 A/B Test This Week

According to developers and testers on X, ChatGPT users reported significantly longer response times and improved outputs this week (June 18-19), suggesting OpenAI is quietly A/B testing GPT-5.6 within ChatGPT for some Pro accounts. Response times jumped from the typical 10 minutes to 60+ minutes for complex tasks like 3D game generation, while design and web outputs showed noticeable improvements.

Leaked specifications attributed to the model include a knowledge cutoff pushed to December 2025, a reasoning-effort parameter raised from 768 to 960, and enhanced SVG and 3D design capabilities. Multiple sources on X suggest a planned public launch on Thursday, June 25, though OpenAI has not confirmed any of these details. Polymarket contracts pricing a launch between June 22 and June 28 hit 89% this week.