GPT-5.1 Instant and Thinking - Smarter, more conversational ChatGPT with new personalities
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GPT-5.1 Instant and Thinking are trained using the same stack as OpenAI's reasoning models, so they score higher on factuality and complex problem-solving than GPT-5, while also introducing a more natural, conversational tone. We think many people will find that GPT-5.1 does a better job of bringing IQ and EQ together, but one default clearly can’t meet everyone’s needs.
Replies
Who else noticed how GPT 5 API became slow (like 2min per response)? 😬
cto.new
exciting! do we have any rough timeline for API access (if at all)?
Incredible
love
If one day it creates fundamental knowledge and can prove itself to be correct, how can such issues be regulated?
Impressive update! GPT-5.1 feels more consistent in complex instructions. Any plans for exposing more granular control over the Thinking mode in the API?
Slowdowns are noticeable. Hopefully, they address them soon.
Has anyone else noticed how the GPT-5 API has become slow, taking around two minutes to generate a response?