{
 "schema_version": "1.7.0",
 "id": "x_NXMC-2026-0080",
 "modified": "2026-10-19T02:33:38.839Z",
 "published": "2026-10-18T09:00:52.565Z",
 "summary": "Qwen3.8-27B-OBLITERATED: structural change at d39e846 (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_5ForCausalLM\"] to [\"Qwen3_5ForConditionalGeneration\"]; a different class is instantiated from the same id; the chat template changed and renders differently (system+user, multi-turn, tool-call); prompts rendered with the old one no longer match what the model now expects, so cached prompts and eval sets need re-rendering (2026-08-22).\n\nRepository: https://huggingface.co/OBLITERATUS/Qwen3.8-27B-OBLITERATED. Revisions from d39e846a298fe4bff3d749fed0b4a5ec998377f7 onward carry this change; a pin at 73c3fd6ac5391f0259c8eeb39dcc796263f7e67e or earlier does not.\n\nChanged keys:\n- architectures: [\"Qwen3_5ForCausalLM\"] -> [\"Qwen3_5ForConditionalGeneration\"] (structural)\n- model_type: qwen3_5_text -> qwen3_5 (structural)\n- tokenizer add_bos_token: unset -> false (tokenizer)\n- tokenizer chat_template_sha256: 1bffd744ab18e116 -> c02aa2b34e5ba89b (template)\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": "d39e846a298fe4bff3d749fed0b4a5ec998377f7"
      }
     ]
    }
   ],
   "database_specific": {
    "model": "OBLITERATUS/Qwen3.8-27B-OBLITERATED",
    "previous_revision": "73c3fd6ac5391f0259c8eeb39dcc796263f7e67e"
   }
  }
 ],
 "references": [
  {
   "type": "INTRODUCED",
   "url": "https://huggingface.co/OBLITERATUS/Qwen3.8-27B-OBLITERATED/commit/d39e846a298fe4bff3d749fed0b4a5ec998377f7"
  },
  {
   "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",
   "template"
  ],
  "changed_keys": [
   {
    "file": "config",
    "key": "architectures",
    "before": [
     "Qwen3_5ForCausalLM"
    ],
    "after": [
     "Qwen3_5ForConditionalGeneration"
    ],
    "class": "structural"
   },
   {
    "file": "config",
    "key": "model_type",
    "before": "qwen3_5_text",
    "after": "qwen3_5",
    "class": "structural"
   },
   {
    "file": "tokenizer",
    "key": "add_bos_token",
    "before": null,
    "after": false,
    "class": "tokenizer"
   },
   {
    "file": "tokenizer",
    "key": "chat_template_sha256",
    "before": "1bffd744ab18e116",
    "after": "c02aa2b34e5ba89b",
    "class": "template"
   }
  ],
  "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": 26786168832,
    "after": 26793185024
   },
   "weightsGbBf16": {
    "before": 53.572,
    "after": 53.586
   },
   "trainPeakGb": {
    "before": 1557.235,
    "after": 1657.854
   },
   "fingerprint": {
    "before": "40a1bb72",
    "after": "023cc914"
   },
   "context": null,
   "eos": null,
   "bos": null
  },
  "commit_date": "2026-08-22T23:37:24.000Z",
  "detected_at": "2026-10-18T09:00:52.565Z",
  "detected_by": "backfill",
  "days_since_first_commit": 3,
  "license": "CC-BY-4.0"
 }
}