Pith Number

pith:L7BU6EDQ

pith:2026:L7BU6EDQXLRZFOVAFDWP5CY5CL

not attested not anchored not stored refs pending

Constraint Tax in Open-Weight LLMs: An Empirical Study of Tool Calling Suppression Under Structured Output Constraints

Aimin Zhang, Chen Lv, Fangzheng Li

arxiv:2606.25605 v1 · 2026-06-24 · cs.CL

Open paper page JSON Open Graph Bundle Merged state Verified badge What is a Pith Number?

Add to your LaTeX paper

\usepackage{pith}
\pithnumber{L7BU6EDQXLRZFOVAFDWP5CY5CL}

Prints a linked badge after your title and injects PDF metadata. Compiles on arXiv. Learn more · Embed verified badge

Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Receipt and verification

First computed	2026-06-25T01:18:10.168443Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

5fc34f1070bae392baa028ecfe8b1d12f840c4462c17f2c4caa25cbbc9d65f56

Aliases

arxiv: 2606.25605 · arxiv_version: 2606.25605v1 · doi: 10.48550/arxiv.2606.25605 · pith_short_12: L7BU6EDQXLRZ · pith_short_16: L7BU6EDQXLRZFOVA · pith_short_8: L7BU6EDQ

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/L7BU6EDQXLRZFOVAFDWP5CY5CL \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: 5fc34f1070bae392baa028ecfe8b1d12f840c4462c17f2c4caa25cbbc9d65f56

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "ede9924eabb037fda3398abb00d620b9ee0bda6a4ae38faa79900a7f8839e2e2",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "cs.CL",
    "submitted_at": "2026-06-24T09:14:18Z",
    "title_canon_sha256": "2fb23602bf0b00711ab8fd5bbf7b8c4ebdff0b9122cba71e6f4b782771f3dd91"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2606.25605",
    "kind": "arxiv",
    "version": 1
  }
}