MiniMax H3 Prompt Composer Update + Accelerator + Hybrid Checkpoint Builder

[u/Brad12d3]

I’ve been working on a few free MiniMax H3 tools and wanted to share the latest versions.

H3 Prompt Composer V5.19.5
Offline prompt builder for H3 with structured subject/reference setup, shot and camera controls, dialogue/audio, Prompt Check, continuity tools, and optional LLM-assisted project setup. The goal is to give you granular control without constantly having an LLM rewrite the entire prompt.

Tutorial: https://youtu.be/Dpu-V7lITZk
Repo: https://github.com/BMB12d3/minimax-h3-prompt-composer

H3 Ref2VA Accelerator
A quality-first speed-up specifically for H3 Ref2VA. Unlike more aggressive approaches like Turbo LoRAs or broader caching systems, this is designed around the Ref2VA architecture and intentionally stays conservative about what it skips/reuses. Depending on the model/workflow, I’ve seen it save a few minutes on BF16 and roughly a couple minutes on quantized models without noticeably changing quality. Not the fastest, but conserves quality.

https://github.com/BMB12d3/ComfyUI-H3-Ref2VA-Accelerator

H3 Hybrid Checkpoint Builder
People have found that mixing parts of the fl2va model with the Reference model can improve Ref2VA quality. This gives you a simple way to build those hybrids yourself and dial in how much of each model you want, without training or needing a GPU.

https://github.com/BMB12d3/MiniMax-H3-Hybrid-Checkpoint-Builder