Comment by Someone1234
4 hours ago
Unfortunately no word on "Thinking Mini" getting fixed.
Before GPT-5 was released it used to be a perfect compromise between a "dumb" non-Thinking model and a SLOW Thinking model. However, something went badly wrong within the GPT-5 release cycle, and today it is exactly the same speed (or SLOWER) than their Thinking model even with Extended Thinking enabled, making it completely pointless.
In essence Thinking Mini exists because it is faster than Thinking, but smarter than non-Thinking, but it is dumber than full-Thinking while not being faster.
In my opinion I think it’s possible to infer by what has been said[1], and the lack of a 5.1 “Thinking mini” version, that it has been folded into 5.1 Instant with it now deciding when and how much to “think”. I also suspect 5.1 Thinking will be expected to dynamically adapt to fill in the role somewhat given the changes there.
[1] “GPT‑5.1 Instant can use adaptive reasoning to decide when to *think before responding*”
Which model are you talking about here?
The one that I said in my comment, GPT-5 Thinking Mini.
I was confused when you said "Before GPT-5 was released it used to be a perfect compromise between a "dumb" non-Thinking model and a SLOW Thinking model" - so I guess you mean the difference between GPT-4o and o3 there?