{
 "schema_version": "1.7.0",
 "id": "x_NXMC-2026-0079",
 "modified": "2026-10-19T02:33:38.839Z",
 "published": "2026-10-18T09:00:52.565Z",
 "summary": "Qwen3.8-27B-OBLITERATED: structural change at 73c3fd6 (2026-08-22)",
 "details": "Qwen3.8-27B-OBLITERATED: derived parameters 26.79B to 26.79B (-7.0M, -0.01 GB of bf16 weights); architectures [\"Qwen3_5ForConditionalGeneration\"] to [\"Qwen3_5ForCausalLM\"]; a different class is instantiated from the same id; add_bos_token false to unset; encoding the same text yields different ids (2026-08-22).\n\nRepository: https://huggingface.co/OBLITERATUS/Qwen3.8-27B-OBLITERATED. Revisions from 73c3fd6ac5391f0259c8eeb39dcc796263f7e67e onward carry this change; a pin at fc09b0df0896106d9bd6bcd7403905dd83fe12d7 or earlier does not.\n\nChanged keys:\n- architectures: [\"Qwen3_5ForConditionalGeneration\"] -> [\"Qwen3_5ForCausalLM\"] (structural)\n- model_type: qwen3_5 -> qwen3_5_text (structural)\n- tokenizer add_bos_token: false -> unset (tokenizer)\n\nThis record says what the change does mechanically. It is not a report that anything broke for anyone.",
 "affected": [
  {
   "ranges": [
    {
     "type": "GIT",
     "repo": "https://huggingface.co/OBLITERATUS/Qwen3.8-27B-OBLITERATED",
     "events": [
      {
       "introduced": "73c3fd6ac5391f0259c8eeb39dcc796263f7e67e"
      }
     ]
    }
   ],
   "database_specific": {
    "model": "OBLITERATUS/Qwen3.8-27B-OBLITERATED",
    "previous_revision": "fc09b0df0896106d9bd6bcd7403905dd83fe12d7"
   }
  }
 ],
 "references": [
  {
   "type": "INTRODUCED",
   "url": "https://huggingface.co/OBLITERATUS/Qwen3.8-27B-OBLITERATED/commit/73c3fd6ac5391f0259c8eeb39dcc796263f7e67e"
  },
  {
   "type": "PACKAGE",
   "url": "https://huggingface.co/OBLITERATUS/Qwen3.8-27B-OBLITERATED"
  },
  {
   "type": "WEB",
   "url": "https://www.neurarch.com/changes-feeds/models/OBLITERATUS/Qwen3.8-27B-OBLITERATED.html"
  }
 ],
 "database_specific": {
  "source": "neurarch model change tracker",
  "model": "OBLITERATUS/Qwen3.8-27B-OBLITERATED",
  "kind": "structural",
  "classes": [
   "structural",
   "tokenizer"
  ],
  "changed_keys": [
   {
    "file": "config",
    "key": "architectures",
    "before": [
     "Qwen3_5ForConditionalGeneration"
    ],
    "after": [
     "Qwen3_5ForCausalLM"
    ],
    "class": "structural"
   },
   {
    "file": "config",
    "key": "model_type",
    "before": "qwen3_5",
    "after": "qwen3_5_text",
    "class": "structural"
   },
   {
    "file": "tokenizer",
    "key": "add_bos_token",
    "before": false,
    "after": null,
    "class": "tokenizer"
   }
  ],
  "impact": {
   "memory": true,
   "serving": true,
   "tokenizer": true,
   "licence": null
  },
  "breaking": true,
  "breaking_rule": "https://www.neurarch.com/changes-feeds/advisories/index.json#breaking_rule",
  "consequence": {
   "params": {
    "before": 26793185024,
    "after": 26786168832
   },
   "weightsGbBf16": {
    "before": 53.586,
    "after": 53.572
   },
   "trainPeakGb": {
    "before": 1657.854,
    "after": 1557.235
   },
   "fingerprint": {
    "before": "023cc914",
    "after": "40a1bb72"
   },
   "context": null,
   "eos": null,
   "bos": null
  },
  "commit_date": "2026-08-22T08:57:29.000Z",
  "detected_at": "2026-10-18T09:00:52.565Z",
  "detected_by": "backfill",
  "days_since_first_commit": 2,
  "license": "CC-BY-4.0"
 }
}