Claude Opus 5.5 and GPT-6 Sol arrived as the newest members of their families in Vizify, and on paper they sit in the same place: both are Paid-tier chat models, both accept an uploaded image with the text, and both have a Fast twin charged at double the per-token credit rate. If access and modality were the whole story there would be nothing to choose between.
The difference is who controls reasoning. Vizify runs Opus 5.5 in a fixed, model-managed mode: reasoning is always on and the chat picker offers no effort setting, so the model decides how much thinking an answer gets. GPT-6 Sol exposes six effort steps, from none to max, and you can change the step for each request — useful when some messages need a direct reply and others deserve more work.
Both replace models that are still in the catalog. Claude Opus 5.5 follows Opus 5 and Opus 4.8, and GPT-6 Sol follows GPT-5.6 Sol, so an ongoing conversation on an older model keeps working. For the other Claude-versus-GPT-6 pairing, see Claude Fable 5.1 vs GPT-6 Luna.