MTPLX 2.7.2

Fixes

• mtplx pull no longer corrupts files that changed upstream (#258, #234). The downloader treated a complete local file whose size no longer matched the server as an interrupted download, and byte-range appended the remote tail onto the old content. Updating a repo in place corrupted config.json and model.safetensors.index.json and left the model unloadable. Stale files are now discarded and re-fetched whole; genuinely interrupted *.incomplete downloads still resume. (Only pulls with progress reporting, the interactive CLI, --progress-json, and the app, had the bug; mtplx pull --json routes through hf_hub's etag downloader and was never affected.)

Already hit by this? A file the old downloader corrupted ends up at exactly the size the server reports, so mtplx pull on 2.7.2 still sees it as complete and cannot repair it on its own. Delete the affected model's config.json and model.safetensors.index.json from its folder under ~/.mtplx/models/, then run mtplx pull again on 2.7.2.

• The Qwen 3.8 models can see again (#263). All six published 3.8 repos (Bare Speed, Optimized Speed, Optimized Quality, and their FP16 siblings) shipped without their vision towers: the forge convert lane kept only the text model. The repos were re-published on 2026-08-15 with the official bf16 tower grafted back in as an index-registered model-vision.safetensors; language and MTP tensors are untouched, so an existing install picks the repair up as a ~0.9 GB delta. mtplx forge build now grafts the vision tower, vision_config, and preprocessor sidecars on every lane and fails closed rather than producing a blind artifact (a repair script for already-forged artifacts ships as scripts/graft_vision_tower.py). Catalog and app download sizes now include the tower.

Still open

• With reasoning off, in a plain chat with no tools, Qwen 3.8 can still emit a stray tool call and end the turn early. Leave thinking on. (Unchanged from 2.7.1.)

Upgrading

• Upgrade before pulling the repaired Qwen 3.8 repos.
• CLI: pip install -U mtplx or brew upgrade mtplx.
• App: Sparkle will offer 2.7.2 (build 2007002), or grab the DMG.
• If a pull on 2.7.1 already corrupted a model, see the first fix above for the two files to delete before pulling again.