The ltx-2 family resolves unsloth/LTX-2-FP8 for the base pipeline and
unsloth/LTX-2.3-FP8 for the 2.3 distilled weights via the variant table
(keyed on the lowercased 2.3 base; a checkpoint baked from the base DiT
fails base_model_id validation against 2.3). The 2.3 checkpoints are
built from the official single file through the exact runtime assembly
path: the builder gains --ltx23-single-file and load_ltx23_pipeline
gains transformer_override so a pre-built DiT can be injected while the
single file contributes only connectors, VAEs and vocoder.
Every checkpoint is gate-validated through the real VideoBackend and
verified bit-identical to on-the-fly quantization (int8: 4186 tensors,
1350 quantized, 0 mismatches; fp8: 4186 tensors, 1360 quantized, 0
mismatches), with same-seed generation deterministic per load.
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