ModelMergeCosmos7B_motorway_edition

Cosmos comes in sizes, and the 7B is the one that fits on more GPUs. ModelMergeCosmos7B is ComfyUI's per-block merge node for the smaller Cosmos architecture - 28 transformer blocks with the same embedder family as its 14B sibling - and this is its Motorway-ed clone.

The block layout

• pos_embedder and extra_pos_embedder - positional embeddings for spatial/temporal structure.
• x_embedder - the latent input projection.
• t_embedder - timestep conditioning.
• affline_norm - the conditioning-path normalization (the spelling is from the architecture, not a typo).
• blocks.block0–blocks.block27 - the 28 main transformer blocks. Early blocks carry coarse structure and motion; later ones carry fine temporal detail.
• final_layer - the output projection.

The 7B node mirrors the 14B node with a smaller block count - same embedders, same behavior, fewer transformers. And the family gotcha holds: all ratios default to 1.0, so an untouched merge returns model2. The practical recipe is identical to the other per-block nodes - set a base blend across all the floats, sample, then push the regions you care about.

Honest note on the whole Cosmos merge niche: NVIDIA pitched these models at world-model and research use, so the community recipe book for merging them is thin compared to the SDXL/Flux scene. You're more likely here because the motorway_edition generator cloned every built-in node than because the merge culture demanded it - which is fine. The node works exactly like its siblings; you'll just be writing your own playbook for what blends well.

The inputs

• INPUT_model1_key (default model1) and INPUT_model2_key (default model2) - the two Cosmos 7B models.
• The block ratios, each 0.0–1.0, step 0.01, default 1.0.
• OUTPUT_MODEL_key (default MODEL) - where the merged model lands.

The wrapper keeps every ratio as a widget, turns the models into key strings, and keyed-writes the result. Runtime behavior matches stock ModelMergeCosmos7B.

Install

One install for the whole pack. ComfyUI Manager, search "ComfyUI_agilly1989_motorway", or:

cd ComfyUI/custom_nodes
git clone https://github.com/agilly1989/ComfyUI_agilly1989_motorway

Restart ComfyUI. No requirements.txt, no model downloads.

Troubleshooting

• Result is pure model2? All ratios default to 1.0 - set a base blend first.
• Don't use the 7B node on 14B weights (or vice versa) - the block counts differ and the ratios won't map.
• Merge Cosmos with Cosmos only; other video/transformer families have incompatible layouts.
• 'MotorwayClass' object has no attribute 'hash_' = a model key isn't in the Motorway; check the loaders ran and the key spelling matches (case-sensitive).
• Pack caveats: BETA, and the newest published version (1.1.7) disabled clone generation, so on a fresh install these _motorway_edition nodes may be missing from the menu. They're present in the 1.1.0–1.1.6 builds comfy.icu indexed.