{
 "schema_version": "1.7.0",
 "id": "x_NXMC-2026-0049",
 "modified": "2026-10-19T02:33:38.839Z",
 "published": "2026-10-18T09:00:52.565Z",
 "summary": "Qwen3.8-27B-DSpark: structural change at d0755f9 (2026-08-28)",
 "details": "Qwen3.8-27B-DSpark: EOS changed from 248046 to 248044; anything fine-tuned or served against the old value stops at a different token; BOS 248044 removed; MLP width 10240 to 17408, attention heads 40 to 32 (2026-08-28).\n\nRepository: https://huggingface.co/RadixArk/Qwen3.8-27B-DSpark. Revisions from d0755f9c75414ab679101ea75453d7b4687a20d4 onward carry this change; a pin at 923ed3a8572615643f0137e424e4ce4edd7f1cda or earlier does not.\n\nChanged keys:\n- bos_token_id: 248044 -> unset (tokenizer)\n- eos_token_id: 248046 -> 248044 (tokenizer)\n- intermediate_size: 10240 -> 17408 (structural)\n- num_attention_heads: 40 -> 32 (structural)\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/RadixArk/Qwen3.8-27B-DSpark",
     "events": [
      {
       "introduced": "d0755f9c75414ab679101ea75453d7b4687a20d4"
      }
     ]
    }
   ],
   "database_specific": {
    "model": "RadixArk/Qwen3.8-27B-DSpark",
    "previous_revision": "923ed3a8572615643f0137e424e4ce4edd7f1cda"
   }
  }
 ],
 "references": [
  {
   "type": "INTRODUCED",
   "url": "https://huggingface.co/RadixArk/Qwen3.8-27B-DSpark/commit/d0755f9c75414ab679101ea75453d7b4687a20d4"
  },
  {
   "type": "PACKAGE",
   "url": "https://huggingface.co/RadixArk/Qwen3.8-27B-DSpark"
  },
  {
   "type": "WEB",
   "url": "https://www.neurarch.com/changes-feeds/models/RadixArk/Qwen3.8-27B-DSpark.html"
  }
 ],
 "database_specific": {
  "source": "neurarch model change tracker",
  "model": "RadixArk/Qwen3.8-27B-DSpark",
  "kind": "structural",
  "classes": [
   "structural",
   "tokenizer"
  ],
  "changed_keys": [
   {
    "file": "config",
    "key": "bos_token_id",
    "before": 248044,
    "after": null,
    "class": "tokenizer"
   },
   {
    "file": "config",
    "key": "eos_token_id",
    "before": 248046,
    "after": 248044,
    "class": "tokenizer"
   },
   {
    "file": "config",
    "key": "intermediate_size",
    "before": 10240,
    "after": 17408,
    "class": "structural"
   },
   {
    "file": "config",
    "key": "num_attention_heads",
    "before": 40,
    "after": 32,
    "class": "structural"
   }
  ],
  "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": 3644106240,
    "after": 4142179840
   },
   "weightsGbBf16": {
    "before": 7.288,
    "after": 8.284
   },
   "trainPeakGb": {
    "before": 212.629,
    "after": 239.278
   },
   "fingerprint": null,
   "context": null,
   "eos": {
    "before": 248046,
    "after": 248044
   },
   "bos": {
    "before": 248044,
    "after": null
   }
  },
  "commit_date": "2026-08-28T03:59:22.000Z",
  "detected_at": "2026-10-18T09:00:52.565Z",
  "detected_by": "backfill",
  "days_since_first_commit": 13,
  "license": "CC-BY-4.0"
 }
}