Positive users praise Codex CLI's GPT-5.5 as the strongest agentic coding model yet while negative users criticize its heavy Windows startup performance, cumbersome config tracking, and inability to select the newer model.
Based on 12 visible X reactions from 29 accounts; directional sample.
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@coreyching @theo Please take a look at performance in Windows, it is really heavy at startup, but the worst offender is that It pins one core on the machine and don't let it idle properly without doing any work, from what I can tell, there is an strange interaction between it and Windows Defender
@theo Codex cli is the saddest one out of the big 4
@theo It's our strongest agentic coding model yet
@theo 5.5 is peak. Not too loud. Not too quiet.
Positive users praise Codex CLI's GPT-5.5 as the strongest agentic coding model yet while negative users criticize its heavy Windows startup performance, cumbersome config tracking, and inability to select the newer model.
Based on 12 visible X reactions from 29 accounts; directional sample.
Ask a question below.
Published answers will appear here.
@theo LETSGOOO