The SI redefinition of the mole took effect on May 20, 2019, based on a fixed...

**Cycle ID:** `cycle_8335_cyc_8335_ba229f9a` **Verified at:** 2026-04-12T21:00:08.004Z **Ensemble:** 9 models from 3 providers **Result:** 9 of 9 models responded **Cycle wall time:** 24.656 seconds **Canonical URL:** https://trust.polylogicai.com/claim/the-si-redefinition-of-the-mole-took-effect-on-may-20-2019-based-on-a-fixed-avog **Source paper:** [PolybrainBench (version 12)](https://trust.polylogicai.com/polybrainbench) **Source ledger row:** [`public-ledger.jsonl#cycle_8335_cyc_8335_ba229f9a`](https://huggingface.co/datasets/polylogic/polybrainbench/blob/main/public-ledger.jsonl) **Cryptographic provenance:** SHA-256 `5da52c348bca93af8d6cd7272b47ff985cf2af26285f026ec5f6cd4efeb3a67b`

Verification verdict

Of 9 models in the ensemble, 9 responded successfully and 0 failed.

Per-model responses

The full text of each model's response is available in the source ledger. The summary below records each model's success or failure and the first 280 characters of its response.

| Model | Status | Response chars | | --- | :---: | ---: | | gpt-4.1-mini | ✓ | 633 | | gpt-4.1-nano | ✓ | 3217 | | gpt-oss-120b | ✓ | 305 | | grok-3-mini | ✓ | 7391 | | grok-4-fast | ✓ | 5309 | | kimi-k2-groq | ✓ | 547 | | llama-3.3-70b | ✓ | 2418 | | llama-4-scout | ✓ | 706 | | qwen3-32b | ✓ | 6337 |

Pairwise agreement

The pairwise Jaccard agreement between successful responses for this cycle:

_Per-cycle pairwise agreement matrix is computed offline; will be populated in canonical page v2._

Divergence score

This cycle's divergence score is **TBD** on a 0 to 1 scale, where 0 means all responses are token-identical and 1 means no two responses share any tokens. The dataset-wide median divergence is 0.5 for context.

How to cite this claim

```bibtex @misc{polybrainbench_claim_cycle_8335_cyc_8335_ba229f9a, author = {Polylogic AI}, title = {The SI redefinition of the mole took effect on May 20, 2019, based on a fixed Avogadro constant.}, year = {2026}, howpublished = {PolybrainBench cycle cycle_8335_cyc_8335_ba229f9a}, url = {https://trust.polylogicai.com/claim/the-si-redefinition-of-the-mole-took-effect-on-may-20-2019-based-on-a-fixed-avog} } ```

Reproduce this cycle

```bash node ~/polybrain/bin/polybrain-cycle.mjs start --raw --fast "The SI redefinition of the mole took effect on May 20, 2019, based on a fixed Avogadro constant." ```

Schema.org structured data

```json { "@context": "https://schema.org", "@type": "ClaimReview", "datePublished": "2026-04-12T21:00:08.004Z", "url": "https://trust.polylogicai.com/claim/the-si-redefinition-of-the-mole-took-effect-on-may-20-2019-based-on-a-fixed-avog", "claimReviewed": "The SI redefinition of the mole took effect on May 20, 2019, based on a fixed Avogadro constant.", "itemReviewed": { "@type": "Claim", "datePublished": "2026-04-12T21:00:08.004Z", "appearance": "https://trust.polylogicai.com/claim/the-si-redefinition-of-the-mole-took-effect-on-may-20-2019-based-on-a-fixed-avog", "author": { "@type": "Organization", "name": "PolybrainBench" } }, "reviewRating": { "@type": "Rating", "ratingValue": "9", "bestRating": "9", "worstRating": "0", "alternateName": "Unanimous" }, "author": { "@type": "Organization", "name": "Polylogic AI", "url": "https://polylogicai.com" } } ```

Provenance and integrity

This page was generated by the PolybrainBench daemon at version 0.1.0 from cycle cycle_8335_cyc_8335_ba229f9a. The full provenance chain (per-response SHA-256 stamps, cross-cycle prev-hash linking, Thalamus grounding verification) is recorded in the source cycle directory at `~/polybrain/cycles/8335/provenance.json` and mirrored in the published dataset. The page is regenerated on every harvest pass; the URL is permanent and the content is immutable for any given paper version.