The trick to using the GPT5 series models is to reduce restrictions
Someone shared very long and fancy prompts claiming to improve GPT5’s performance, which should be viewed with caution. Unlike the sonnet or opus4.6 and earlier models in claudecode, GPT5 is more noticeably negatively affected by randomly written custom prompts. GPT5’s system prompts should be carefully considered, otherwise it is easy to degrade the model’s performance.
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Someone shared very long and fancy prompts claiming to improve GPT5’s performance, which should be viewed with caution. Unlike the sonnet or opus4.6 and earlier models in claudecode, GPT5 is more noticeably negatively affected by randomly written custom prompts. GPT5’s system prompts should be carefully considered, otherwise it is easy to degrade the model’s performance.
