GPT-5.6 Luna and Claude Fable 5 both require paid model access. Both accept text and images and produce text in Vizify. Choose between them based on your task and preferred model family; this page does not claim a quality or speed ranking.
Both need Pro or a credit pack purchase; free accounts use GPT-5.4 Mini. With paid access, either is available from the same model picker, alongside GPT-5.6 Terra and Sol if you’d rather stay in the GPT-5.6 family.
Both models now have newer successors. GPT-6 Luna succeeds GPT-5.6 Luna, and Claude Fable 5.1 succeeds Fable 5, each with the same Paid tier and image input. GPT-5.6 Luna and Fable 5 stay available, so this comparison still applies if you want to keep using them. The successors have their own comparison: Claude Fable 5.1 vs GPT-6 Luna.
This page intentionally stops short of claiming one family reasons or writes better than the other — Vizify’s catalog does not expose that kind of comparative data, and this product runs one selected model per request rather than a side-by-side test. Use the tier and modality facts here to pick a starting point, then switch models for a later request if the task changes.