Core capability
What Gen-4.5 is actually good at
Runway built Gen-4.5 around understanding complex, sequenced instructions in a single prompt — detailed camera choreography, layered scene composition, precise timing of events, and subtle atmospheric changes — while holding the visual fidelity and prompt adherence that put it on top of Artificial Analysis's leaderboard.
Runway's own policy rules out adult content
Runway's Usage Policy explicitly prohibits "sexually explicit content, including sex toys and certain fetish content," "adult nudity," and any attempt to create non-consensual intimate imagery — and states Runway limits sexually suggestive content, including underwear or lingerie, "in some cases." That's Runway's own published language, enforced through automated detection plus internal human review.
Versions and current access
Current access: this is a Runway alternatives guide, not a claim that a Runway-specific selector is live on Makeartly. Open Studio to compare the video models that the current catalogue actually exposes.
Evidence
Where Makeartly's video lineup stands
Makeartly has no relationship to Runway or Gen-4.5 — Runway's policy makes clear it isn't a candidate for adult content regardless of integration. Makeartly runs Kling, Seedance, Wan, Vidu, and Hailuo, uncensored for verified adult (18+) creators, governed by Makeartly's own Content Policy instead.
Use cases
When this article is useful
Runway Gen-4.5 tops the Artificial Analysis video leaderboard but bans adult nudity by policy. Makeartly is a free uncensored AI video alternative. 18+ only.
A focused first test
Runway built Gen-4.5 around understanding complex, sequenced instructions in a single prompt — detailed camera choreography, layered scene composition, precise timing of events, and subtle atmospheric changes — while holding the visual fidelity and prompt adherence that put it on top of Artificial Analysis's leaderboard.