Cicada Park · AI-driven game development
Which AI models can you legally use in a paid game?
Short answer: FLUX.1 [schnell] for pictures, MV-Adapter and TRELLIS image-large for 3-D models, BiRefNet for cut-outs, and the Qwen 3.5 language models with llama.cpp for talking characters are all under licences that allow a game you sell, if you leave out a few non-commercial helper parts. FLUX [dev], FLUX Kontext [dev] and Hunyuan3D are not usable for a paid game offered in Europe. The table below gives every verdict.
Updated 29 October 2026. We build Cicada Park, an online fantasy RPG, with these models, and we update this page when a licence or a model changes.
The table
| Use | Model or tool | Paid game? | Why |
|---|---|---|---|
| Pictures | FLUX.1 [schnell] | Yes | Apache-2.0 |
| Pictures | Stable Diffusion XL base | Yes, with conditions | OpenRAIL++-M: its use restrictions must be passed on in your terms of use |
| Pictures | FLUX.1 [dev], FLUX Kontext [dev] | No | Non-commercial licence |
| More views of one figure | MV-Adapter | Yes | Apache-2.0; leave out its mesh helpers that pull non-commercial or GPL code |
| Picture to 3-D | TRELLIS image-large | Yes | MIT; never import its renderers and helpers under non-commercial or copyleft licences |
| Picture to 3-D | TRELLIS.2 | Check | MIT, but a dependency (nvdiffrast) is non-commercial; needs a 24 GB card |
| Picture to 3-D | Hunyuan3D 2.x | No (in Europe) | Its licence excludes the EU, the UK and South Korea |
| Picture to 3-D | Paid services (Tripo, Rodin, Meshy) | Their terms | Paid, hosted: read each service's terms |
| Cut-outs | BiRefNet | Yes | MIT |
| Rigging | UniRig | Check | Code MIT; the checkpoint's terms are not stated |
| Talking characters | Qwen 3.5 (9B, 4B) | Yes | Apache-2.0 |
| Running language models | llama.cpp | Yes | MIT |
How we decide
Our rule: anything that is legal to use in a game sold to the public, without paying a fee, is allowed; nothing non-commercial, and no copyleft code inside the game. Before a model is downloaded we read its card and its licence file, and we write down the verdict. A model's code, its weights and the libraries it pulls in can each have different terms: check all three.
Questions
Can I use FLUX.1 [schnell] for art in a game I sell?
Yes. It is under Apache-2.0. Its siblings FLUX.1 [dev] and FLUX Kontext [dev] are not: they are non-commercial.
Can I use Hunyuan3D in a paid game?
Not for players in the European Union, the United Kingdom or South Korea: its community licence excludes those territories.
Can I use TRELLIS for 3-D models in a paid game?
Yes, the image-large model is MIT-licensed. Run only the image-to-mesh path and keep its non-commercial and copyleft helper parts out of your build.
This page is general information from a studio that uses these tools, not legal advice. Licences change: check each one yourself before you ship.