{
 "schema_version": "1.7.0",
 "id": "x_NXMC-2025-0075",
 "modified": "2026-10-19T02:33:38.839Z",
 "published": "2026-10-18T09:00:52.565Z",
 "summary": "Qwen3-8B-AWQ: structural change at c664f5e (2025-05-03)",
 "details": "Qwen3-8B-AWQ: EOS changed from 151645 to [151645,151643]; anything fine-tuned or served against the old value stops at a different token; BOS declared as 151643 (was unset); context window 65536 to 40960 tokens (2025-05-03).\n\nRepository: https://huggingface.co/Qwen/Qwen3-8B-AWQ. Revisions from c664f5e955c33186a8b7a5cf0cbc3b220e4afdd4 onward carry this change; a pin at cb7d6a337aadb4d2082ed0dcef1032e4f8645194 or earlier does not.\n\nChanged keys:\n- bos_token_id: unset -> 151643 (tokenizer)\n- max_position_embeddings: 65536 -> 40960 (structural)\n- pad_token_id: 151643 -> unset (tokenizer)\n- tokenizer chat_template_sha256: be3e45a0ad8b7079 -> 87a2728cb8dc9fe4 (template)\n- generation bos_token_id: unset -> 151643 (tokenizer)\n- generation eos_token_id: 151645 -> [151645,151643] (tokenizer)\n- generation temperature: unset -> 0.6 (generation-defaults)\n- generation top_k: unset -> 20 (generation-defaults)\n- generation top_p: unset -> 0.95 (generation-defaults)\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/Qwen/Qwen3-8B-AWQ",
     "events": [
      {
       "introduced": "c664f5e955c33186a8b7a5cf0cbc3b220e4afdd4"
      }
     ]
    }
   ],
   "database_specific": {
    "model": "Qwen/Qwen3-8B-AWQ",
    "previous_revision": "cb7d6a337aadb4d2082ed0dcef1032e4f8645194"
   }
  }
 ],
 "references": [
  {
   "type": "INTRODUCED",
   "url": "https://huggingface.co/Qwen/Qwen3-8B-AWQ/commit/c664f5e955c33186a8b7a5cf0cbc3b220e4afdd4"
  },
  {
   "type": "PACKAGE",
   "url": "https://huggingface.co/Qwen/Qwen3-8B-AWQ"
  },
  {
   "type": "WEB",
   "url": "https://www.neurarch.com/changes-feeds/models/Qwen/Qwen3-8B-AWQ.html"
  }
 ],
 "database_specific": {
  "source": "neurarch model change tracker",
  "model": "Qwen/Qwen3-8B-AWQ",
  "kind": "structural",
  "classes": [
   "structural",
   "tokenizer",
   "template",
   "generation-defaults"
  ],
  "changed_keys": [
   {
    "file": "config",
    "key": "bos_token_id",
    "before": null,
    "after": 151643,
    "class": "tokenizer"
   },
   {
    "file": "config",
    "key": "max_position_embeddings",
    "before": 65536,
    "after": 40960,
    "class": "structural"
   },
   {
    "file": "config",
    "key": "pad_token_id",
    "before": 151643,
    "after": null,
    "class": "tokenizer"
   },
   {
    "file": "tokenizer",
    "key": "chat_template_sha256",
    "before": "be3e45a0ad8b7079",
    "after": "87a2728cb8dc9fe4",
    "class": "template"
   },
   {
    "file": "generation",
    "key": "bos_token_id",
    "before": null,
    "after": 151643,
    "class": "tokenizer"
   },
   {
    "file": "generation",
    "key": "eos_token_id",
    "before": 151645,
    "after": [
     151645,
     151643
    ],
    "class": "tokenizer"
   },
   {
    "file": "generation",
    "key": "temperature",
    "before": null,
    "after": 0.6,
    "class": "generation-defaults"
   },
   {
    "file": "generation",
    "key": "top_k",
    "before": null,
    "after": 20,
    "class": "generation-defaults"
   },
   {
    "file": "generation",
    "key": "top_p",
    "before": null,
    "after": 0.95,
    "class": "generation-defaults"
   }
  ],
  "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": {
    "before": 65536,
    "after": 40960
   },
   "eos": {
    "before": 151645,
    "after": [
     151645,
     151643
    ]
   },
   "bos": {
    "before": null,
    "after": 151643
   }
  },
  "commit_date": "2025-05-03T12:31:05.000Z",
  "detected_at": "2026-10-18T09:00:52.565Z",
  "detected_by": "backfill",
  "days_since_first_commit": 0,
  "license": "CC-BY-4.0"
 }
}