ChatGPT adds a clearer reasoning-effort choice
The useful choice is how much effort a task deserves, rather than memorising every model name.
What changed
OpenAI began rolling GPT-5.6 Sol and Sol Pro into ChatGPT reasoning modes while the everyday default remains a faster option.
Who should care
People comparing difficult options. People using ChatGPT for longer analysis.
Try this today
Run one real task at a fast and a deeper setting, then compare usefulness, elapsed time and correction effort.
