{
 "schema_version": "1.7.0",
 "id": "x_NXMC-2026-0044",
 "modified": "2026-10-19T02:33:38.839Z",
 "published": "2026-10-18T09:00:52.565Z",
 "summary": "nomic-embed-text-v1.5: structural change at e9b6763 (2026-04-07)",
 "details": "nomic-embed-text-v1.5: head dim unset to 64; derived parameters 108.9M to 110.1M (+1.2M, +0.00 GB of bf16 weights); context window 8192 to 2048 tokens (2026-04-07).\n\nRepository: https://huggingface.co/nomic-ai/nomic-embed-text-v1.5. Revisions from e9b6763023c676ca8431644204f50c2b100d9aab onward carry this change; a pin at e5cf08aadaa33385f5990def41f7a23405aec398 or earlier does not.\n\nChanged keys:\n- head_dim: unset -> 64 (structural)\n- max_position_embeddings: 8192 -> 2048 (structural)\n- pad_token_id: unset -> 0 (tokenizer)\n- rope_theta: unset -> 1000 (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/nomic-ai/nomic-embed-text-v1.5",
     "events": [
      {
       "introduced": "e9b6763023c676ca8431644204f50c2b100d9aab"
      }
     ]
    }
   ],
   "database_specific": {
    "model": "nomic-ai/nomic-embed-text-v1.5",
    "previous_revision": "e5cf08aadaa33385f5990def41f7a23405aec398"
   }
  }
 ],
 "references": [
  {
   "type": "INTRODUCED",
   "url": "https://huggingface.co/nomic-ai/nomic-embed-text-v1.5/commit/e9b6763023c676ca8431644204f50c2b100d9aab"
  },
  {
   "type": "PACKAGE",
   "url": "https://huggingface.co/nomic-ai/nomic-embed-text-v1.5"
  },
  {
   "type": "WEB",
   "url": "https://www.neurarch.com/changes-feeds/models/nomic-ai/nomic-embed-text-v1.5.html"
  }
 ],
 "database_specific": {
  "source": "neurarch model change tracker",
  "model": "nomic-ai/nomic-embed-text-v1.5",
  "kind": "structural",
  "classes": [
   "structural",
   "tokenizer"
  ],
  "changed_keys": [
   {
    "file": "config",
    "key": "head_dim",
    "before": null,
    "after": 64,
    "class": "structural"
   },
   {
    "file": "config",
    "key": "max_position_embeddings",
    "before": 8192,
    "after": 2048,
    "class": "structural"
   },
   {
    "file": "config",
    "key": "pad_token_id",
    "before": null,
    "after": 0,
    "class": "tokenizer"
   },
   {
    "file": "config",
    "key": "rope_theta",
    "before": null,
    "after": 1000,
    "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": 108874752,
    "after": 110054400
   },
   "weightsGbBf16": {
    "before": 0.218,
    "after": 0.22
   },
   "trainPeakGb": {
    "before": 7.3,
    "after": 22.951
   },
   "fingerprint": null,
   "context": {
    "before": 8192,
    "after": 2048
   },
   "eos": null,
   "bos": null
  },
  "commit_date": "2026-04-07T14:17:02.000Z",
  "detected_at": "2026-10-18T09:00:52.565Z",
  "detected_by": "backfill",
  "days_since_first_commit": 787,
  "license": "CC-BY-4.0"
 }
}