Anthropic vs OpenAI for Writing?

I've been in Claude since early this year because, well, Claude was just better. Seems like a bunch of folks are jumping ship (back) to OpenAI with 5.6 and Astra releases. I haven't had the time to do any testing. What's your experience? Anyone compared the writing capabilities between the modern OpenAI models and say Opus 4.8 or Sonnet 5? I've started a 70 article series on Substack and LinkedIn so I'm not switching midstream for that. Just curious

Ari convinced me to look at Grok 4.6 so I'm testing that as well but for coding only.

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Anthropic vs OpenAI for Writing?