Why bring your own model matters for writers
Two anxieties shadow every AI writing tool: where does my manuscript go, and how much will this cost me at scale? Bring-Your-Own-Model answers both. Your text is generated through your own provider key, and you pay provider rates directly instead of marked-up credits.
It also answers a craft question. Different models have different prose instincts. With BYOK you choose the one whose voice you trust for fiction, rather than accepting whatever a tool hard-wires.
A real privacy and cost story
Sudowrite is credit-based and doesn't offer BYOK; Novelcrafter offers it as a core feature. Muze Writer's stance is that model choice and key ownership shouldn't be a power-user privilege — they're available on every tier, including free.
The Muse still does everything it does — reads your Story Core, holds your voice, edits rather than ghostwrites — just powered by the model and key you choose. (See how this compares in Muze Writer vs Sudowrite.)