The Guardrails on Claude Sonnet 3.5 API are not stricter than Openai's guardrails in my experience. More specifically, if you access the models via API or third party services like Poe or Perplexity the guardrails are not stricter than GPT4o. I've never subscribed to Claude.ai so can't comment on that.
I have no experience with Claud.ai vs ChatGPT but it's clear the underlying model has no issue with guardrails and this is simply an easily tweaked developer setting if you are correct that they are stricter on Claude.ai.
(The old Claude 2.1 was hilariously unwilling to follow reasonable user instructions due to "ethics" but they've come a long way since then.)
I have no experience with Claud.ai vs ChatGPT but it's clear the underlying model has no issue with guardrails and this is simply an easily tweaked developer setting if you are correct that they are stricter on Claude.ai.
(The old Claude 2.1 was hilariously unwilling to follow reasonable user instructions due to "ethics" but they've come a long way since then.)