{
 "schema_version": "1.7.0",
 "id": "x_NXMC-2025-0050",
 "modified": "2026-10-19T02:33:38.839Z",
 "published": "2026-10-18T09:00:52.565Z",
 "summary": "Meta-Llama-3.1-8B-Instruct: structural change at 28e14b5 (2025-02-02)",
 "details": "Meta-Llama-3.1-8B-Instruct: EOS changed from [128001,128008,128009] to 128009; anything fine-tuned or served against the old value stops at a different token; head dim unset to 128; add_bos_token unset to true; encoding the same text yields different ids (2025-02-02).\n\nRepository: https://huggingface.co/unsloth/Meta-Llama-3.1-8B-Instruct. Revisions from 28e14b5ea9119456491adc638b85594d58532588 onward carry this change; a pin at 62b4abd08ef28d337b64d3d668f040b75fb6fadc or earlier does not.\n\nChanged keys:\n- eos_token_id: [128001,128008,128009] -> 128009 (tokenizer)\n- head_dim: unset -> 128 (structural)\n- tokenizer add_bos_token: unset -> true (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/unsloth/Meta-Llama-3.1-8B-Instruct",
     "events": [
      {
       "introduced": "28e14b5ea9119456491adc638b85594d58532588"
      }
     ]
    }
   ],
   "database_specific": {
    "model": "unsloth/Meta-Llama-3.1-8B-Instruct",
    "previous_revision": "62b4abd08ef28d337b64d3d668f040b75fb6fadc"
   }
  }
 ],
 "references": [
  {
   "type": "INTRODUCED",
   "url": "https://huggingface.co/unsloth/Meta-Llama-3.1-8B-Instruct/commit/28e14b5ea9119456491adc638b85594d58532588"
  },
  {
   "type": "PACKAGE",
   "url": "https://huggingface.co/unsloth/Meta-Llama-3.1-8B-Instruct"
  },
  {
   "type": "WEB",
   "url": "https://www.neurarch.com/changes-feeds/models/unsloth/Meta-Llama-3.1-8B-Instruct.html"
  }
 ],
 "database_specific": {
  "source": "neurarch model change tracker",
  "model": "unsloth/Meta-Llama-3.1-8B-Instruct",
  "kind": "structural",
  "classes": [
   "structural",
   "tokenizer"
  ],
  "changed_keys": [
   {
    "file": "config",
    "key": "eos_token_id",
    "before": [
     128001,
     128008,
     128009
    ],
    "after": 128009,
    "class": "tokenizer"
   },
   {
    "file": "config",
    "key": "head_dim",
    "before": null,
    "after": 128,
    "class": "structural"
   },
   {
    "file": "tokenizer",
    "key": "add_bos_token",
    "before": null,
    "after": true,
    "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": null,
   "weightsGbBf16": null,
   "trainPeakGb": null,
   "fingerprint": null,
   "context": null,
   "eos": {
    "before": [
     128001,
     128008,
     128009
    ],
    "after": 128009
   },
   "bos": null
  },
  "commit_date": "2025-02-02T04:35:10.000Z",
  "detected_at": "2026-10-18T09:00:52.565Z",
  "detected_by": "backfill",
  "days_since_first_commit": 193,
  "license": "CC-BY-4.0"
 }
}