MTPLX 2.7.2

MTPLX 2.7.2

An emergency fix for mtplx pull. On 2.7.1 and older, re-pulling a model
that changed upstream — such as the Qwen 3.8 repos, re-published on
2026-08-15 with their vision towers restored — can corrupt your local copy.
Upgrade before you pull.

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.