{
 "schema_version": "1.7.0",
 "id": "x_NXMC-2026-0048",
 "modified": "2026-10-19T02:33:38.839Z",
 "published": "2026-10-18T09:00:52.565Z",
 "summary": "phi-4: tokenizer change at 2db69c1 (2026-07-14)",
 "details": "phi-4: EOS changed from 100265 to [100257,100265]; anything fine-tuned or served against the old value stops at a different token (2026-07-14).\n\nRepository: https://huggingface.co/microsoft/phi-4. Revisions from 2db69c1c3e91a05d2c64a3185acfbaf36f744e25 onward carry this change; a pin at 187ef0342fff0eb3333be9f00389385e95ef0b61 or earlier does not.\n\nChanged keys:\n- generation eos_token_id: 100265 -> [100257,100265] (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/microsoft/phi-4",
     "events": [
      {
       "introduced": "2db69c1c3e91a05d2c64a3185acfbaf36f744e25"
      }
     ]
    }
   ],
   "database_specific": {
    "model": "microsoft/phi-4",
    "previous_revision": "187ef0342fff0eb3333be9f00389385e95ef0b61"
   }
  }
 ],
 "references": [
  {
   "type": "INTRODUCED",
   "url": "https://huggingface.co/microsoft/phi-4/commit/2db69c1c3e91a05d2c64a3185acfbaf36f744e25"
  },
  {
   "type": "PACKAGE",
   "url": "https://huggingface.co/microsoft/phi-4"
  },
  {
   "type": "WEB",
   "url": "https://www.neurarch.com/changes-feeds/models/microsoft/phi-4.html"
  }
 ],
 "database_specific": {
  "source": "neurarch model change tracker",
  "model": "microsoft/phi-4",
  "kind": "tokenizer",
  "classes": [
   "tokenizer"
  ],
  "changed_keys": [
   {
    "file": "generation",
    "key": "eos_token_id",
    "before": 100265,
    "after": [
     100257,
     100265
    ],
    "class": "tokenizer"
   }
  ],
  "impact": {
   "memory": false,
   "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": 100265,
    "after": [
     100257,
     100265
    ]
   },
   "bos": null
  },
  "commit_date": "2026-07-14T14:22:25.000Z",
  "detected_at": "2026-10-18T09:00:52.565Z",
  "detected_by": "backfill",
  "days_since_first_commit": 580,
  "license": "CC-BY-4.0"
 }
}