diff --git a/TODO.sota/67-b6-thai-lexicon.md b/TODO.sota/67-b6-thai-lexicon.md
index c4927472..501fb843 100644
--- a/TODO.sota/67-b6-thai-lexicon.md
+++ b/TODO.sota/67-b6-thai-lexicon.md
@@ -1,6 +1,15 @@
 # WO67 — B6: Thai — lexicon-first, three layers (PER < 2)
 
-Status: PLANNED · launchable now
+Status: IN_PROGRESS (lexicon phase landed 2026-10-21)
+Lexicon phase DONE: corpora/tha-phonemic.yaml -- 28,644 train / 3,225
+test (word -> phonemic-with-tones pairs, ORST vocabulary x pythainlp
+royin engine); 6,291 engine-corrupt rows filtered and documented;
+bucket run-080-thai-lexicon, size-verified. NOTE the layer honesty:
+royin emits PHONEMIC+tones, NOT RTGS -- the RTGS layer requires
+encoding bgnpcgn-tha (a BGN/PCGN gap-system row: ROMANIZATION OF
+THAI.pdf, whole-document transcription) then the rule composite.
+NEXT: bgnpcgn-tha encoding; hit-rate metric over the eval set; the
+three-layer (RTGS/IPA/IPA+tone) eval harness.
 Goal: published PER < 2; lexicon hit-rate reported; tone accuracy for
 the TTS layer (RTGS / IPA / IPA+tone tracked separately).
 Method: Royal Institute dictionary (or equivalent licensed lexicon) as
diff --git a/corpora/tha-phonemic.yaml b/corpora/tha-phonemic.yaml
new file mode 100644
index 00000000..f8cd6033
--- /dev/null
+++ b/corpora/tha-phonemic.yaml
@@ -0,0 +1,19 @@
+id: tha-phonemic
+task: g2p
+sources:
+  # ORST (Royal Institute Dictionary) wordlist via pythainlp's corpus
+  # packaging (Apache-2.0); phonemic readings generated by pythainlp's
+  # "royin" engine. Owner note: the underlying wordlist is Royal
+  # Institute of Thailand material redistributed by pythainlp -- terms
+  # recorded here for awareness, SPDX-open packaging clears the gate.
+  # 6,291 rows (17%) dropped: the royin engine repeats syllables on
+  # certain clusters (e.g. rust-class รักษา words) -- generator defect,
+  # filtered, documented in WO67.
+  - kind: bucket
+    id: Interscript/isx-training/run-080-thai-lexicon
+    revision: run-080-thai-lexicon
+    license: Apache-2.0
+    mount: /data-tha
+splits:
+  train: {path: tha-phonemic-train.jsonl, rows: 28644, sha256: 68a799711aa0d4ca8e3d1796cdcaf1b8599c82f0b7390d7d5ea3f53442c39c7d}
+  test: {path: tha-phonemic-test.jsonl, rows: 3225, sha256: a5abe80b9c9f119fa8bdeb51ca22a931b2c5b2d2e946d9ea190161f937b53966}