Stoicheia is a 405M-parameter character-level masked-diffusion encoder for Ancient Greek (d_model 1024, depth 32, banded attention: three of every four blocks attend within a 256-character window, the fourth globally). Its input is factored into five aligned planes -- letters, word/sentence boundaries, diacritics, capitalization, punctuation -- each of which can be masked independently to an explicit unknown state at inference. That is what lets one model read an edited text, scriptio continua, and a lacuna of unknown length without changing anything but its input.

Anonymous release accompanying a paper under review.

Two per-letter heads on Stoicheia-doc_clean, trained jointly: macronization (long versus short at ambiguous bare α/ι/υ -- Greek orthography never marks vowel length) and scansion (none / heavy-end / light-end / verse-end). An optional Viterbi decoder constrains the scansion output to valid paths through a set of metre automata.

Use this checkpoint when you want both tasks from one model; use Stoicheia-macronizer when you want vowel length alone, where a dedicated head does better.