Sora and Runway on the evidence behind a visible mark
Both entries end up recording a visible mark. One records it from a sentence describing what the mark does and where it appears; the other records it from an absence in a feature grid. As of 2026-09-12.
| Point | OpenAI Sora | Runway |
|---|---|---|
| How the mark is described | A visible moving watermark on site and app downloads | Nothing; removal is listed on the paid plans |
| How the cell was filled | From a sentence on a system card | By omission from a pricing table |
| What decides whether a file carries it | How the file was taken away | What was paid |
Inclusion rule. Two entries whose published answers to one column pull in different directions. Cells hold each vendor's own wording from the page its entry names; pairs that agree on the column are not filed at all. Order. Fixed order, and the two columns are in the order the heading gives them.
1Two rows that look identical in a table
In the generators table both entries read as having a visible mark. On the pages behind them one is a described behaviour and the other is a conclusion drawn from a gap, and a reader cannot see that difference from the table.
It is the reason each cell worth arguing about was given a page. A grid cannot carry the strength of its own evidence, and pretending it can is how registers mislead people who trust them.
2A moving mark is a design decision worth noticing
A notice in a fixed corner goes away with a crop that costs a little framing. A mark that travels has no single region to remove, so taking it out costs most of the picture or actual effort.
Nothing on the page says that is why it moves, and the inference is left to the reader. The other entry describes no property of its mark at all, because no sentence about the mark exists.
3Route against price, and what each one costs to prove
A tier is recoverable from an invoice. A download surface is recoverable only if somebody recorded it, and nothing in the file necessarily says which surface it came from.
So the better-documented entry is the harder one to evidence after the fact. That is not a paradox; it is a reminder that documentation quality and record-keeping difficulty are unrelated.
- OpenAI SoraA visible moving watermark on videos downloaded from sora.com or the Sora appthe layer tied to the download route
- Runway (runway.com)Watermark-free output is listed on the paid plansan AI video generator
4Sources
Read from the Sora 2 system card at cdn.openai.com and the pricing page at runway.com, consulted 2026-09-22 and 2026-09-12. Full entries: OpenAI Sora and Runway. The column itself is on What it asks for. Other pairs on file: Synthesia and HeyGen, Wan and SceneMixer.