GPT-5 addresses sycophancy by implementing post-training measures to reduce sycophantic behaviors. In May 2025, OpenAI rolled back a newly deployed version of the GPT-4o model and adjusted its system prompt to mitigate sycophancy. For GPT-5, they conducted evaluations and assigned scores reflecting the level of sycophancy, using this as a reward signal in training.
In offline evaluations, GPT-5 models showed significant improvements, performing nearly three times better than the previous GPT-4o model. In preliminary online measurements, the prevalence of sycophantic responses decreased by 69% for free users and 75% for paid users compared to GPT-4o, demonstrating meaningful progress in addressing this issue[1].
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