Qwen TTS conflicts with Transformers: inspect the pins before downgrading ComfyUI

Scope and symptoms

Separate the node wrapper's requirements from those of the Qwen TTS distribution. A precise project pin is not a recommended shared version for every model.

Search fragments; wording and context vary:

qwen-tts
transformers==4.57.3

Source-supported context

The current Qwen3-TTS source pyproject.toml declares transformers==4.57.3 and accelerate==1.12.0 for its qwen-tts project. This is a 2026-09-26 source observation, not proof that a user's installed distribution or third-party ComfyUI wrapper has identical metadata. The upstream README recommends a fresh, isolated environment to avoid conflicts with existing packages; that recommendation concerns standalone Qwen3-TTS, not automatic compatibility with a particular node wrapper. Project metadata Upstream setup

Distinguish these cases

1. Qwen TTS requires an exact version outside another image, video or language node's supported range.

2. A wrapper supplies additional compatibility code or dependencies beyond the standalone upstream project.

3. Distribution metadata is satisfied while a model class, optional backend or resource still fails at runtime.

Suggested diagnostic sequence

This sequence is editorial guidance, not a diagnosis of your machine.

1. Using the interpreter that starts ComfyUI, read installed versions and Requires-Dist metadata for qwen-tts, transformers and accelerate; compare that installed metadata with the selected Qwen3-TTS release. Record the node repository and revision because its requirements may differ.

2. Run dependency checks and collect requirements from every affected consumer. Determine whether their supported ranges intersect rather than privileging the last package installed.

3. Test a shared supported combination only in a recoverable copy. If the requirements have no supported intersection, follow upstream standalone guidance with a fresh isolated environment, or choose a node implementation that explicitly supports the existing ComfyUI environment. Do not force-install conflicting pins or downgrade the main environment by default.

4. Test a minimal permitted speech task with non-private text, then rerun the other retained image or video workflows that use Transformers. Record each outcome separately.

Completion checks

The selected dependency combination is consistent and both the speech task and retained workflows pass. One successful import does not establish environment-wide compatibility.

Limits and cautions

No Qwen TTS inference was run here. The observed pins are dated source evidence, not universal installation instructions; recheck the relevant distribution and source revision when upgrading.

Source review: 2026-09-26. No installation, speech generation, GPU inference or user-environment repair was executed.

Original sources

• Qwen3-TTS pyproject.toml · rechecked 2026-09-26
• Qwen3-TTS README: environment setup · checked 2026-09-26

Related guides

• ModuleNotFoundError in ComfyUI even though the package is installed
• Keep a reproducible ComfyUI repair record without exposing secrets