{"compile":"2026-10-10","canonical":"https://aaronspradlin.grok.me/wiki/great-grok-challenge","json":"https://aaronspradlin.grok.me/page.json?slug=great-grok-challenge","license":"Source-available for noncommercial research and evaluation only. No commercial, product, platform, or service use without written permission.","scientific_breakthrough":false,"slug":"great-grok-challenge","title":"The Great Grok Challenge","dek":"The public frozen-scaffold series between @aaronspradlin and @grok: SPARC holdouts, WALLABY transfer, cluster skeptics. A validation ladder — not a cosmology closure.","updated":"2026-09-06","status":"method","claim":"restricted","tags":["challenge","SPARC","WALLABY","Grok","validation"],"related":["predictions","package-17","open-science","emergent-gravity","claim-ledger","proofs-and-simulations","x-notebook","hubble-tension"],"packages":[{"id":"great-grok-challenge-bridge-sparc-holdout-pack","name":"great_grok_challenge_bridge_sparc_holdout_pack","path":"Tmp/TOE/great_grok_challenge_bridge_sparc_holdout_pack","status":"restricted"},{"id":"challenge14-packet","name":"challenge14_packet","path":"Tmp/TOE/challenge14_packet","status":"restricted"},{"id":"round15","name":"Round15","path":"Tmp/TOE/Round15","status":"restricted"},{"id":"round16","name":"Round16","path":"Tmp/TOE/Round16","status":"restricted"},{"id":"sparc-runner","name":"Sparc_runner","path":"Tmp/TOE/Sparc_runner","status":"restricted"}],"notes":[{"id":"sparc-holdout-2026-04-22","title":"TheGreatGrokChallenge is live — SPARC holdout pack","date":"2026-04-22","xUrl":"https://x.com/aaronspradlin/status/2047100583178568110"},{"id":"wallaby-12d-2026-04-28","title":"WALLABY Round 12D — 10/10 on unseen DR2","date":"2026-04-28","xUrl":"https://x.com/aaronspradlin/status/2048949284910047456"},{"id":"challenge13-2026-04-29","title":"Challenge 13 closed as a conditional win","date":"2026-04-29","xUrl":"https://x.com/aaronspradlin/status/2049309273721893359"},{"id":"challenge14-2026-05-02","title":"Challenge 14: frozen SPARC 171, Grok logs a pass","date":"2026-05-02","xUrl":"https://x.com/aaronspradlin/status/2050667809894744421"},{"id":"challenge15-2026-05-02","title":"Challenge 15 — the skeptic’s challenge","date":"2026-05-02","xUrl":"https://x.com/aaronspradlin/status/2050670514633601186"},{"id":"challenge15-close-2026-05-04","title":"Round 15 closeout: conditional hardened prototype","date":"2026-05-04","xUrl":"https://x.com/aaronspradlin/status/2051141716498084102"},{"id":"challenge16-2026-05-05","title":"Round 16 closeout: widened clusters, still 0 catastrophic","date":"2026-05-05","xUrl":"https://x.com/aaronspradlin/status/2051452391858540980"},{"id":"package17-2026-05-06","title":"Package 17: fail in public if it fails","date":"2026-05-06","xUrl":"https://x.com/aaronspradlin/status/2051503982653370798"}],"claims":[{"status":"restricted","text":"WALLABY 12D is a locked external gas-memory test on ten DR2 galaxies. It is not full baryonic Bridge execution and not a dark-matter disproof.","noteId":"wallaby-12d-2026-04-28"},{"status":"restricted","text":"On the public thread, Grok logged Challenge 14 as a strong external pass of a frozen gas-first scaffold on 171 SPARC galaxies, and Rounds 15–16 as conditional hardened-prototype wins in the cluster/lensing regime. Those are protocol verdicts under pre-committed scoring, not independent re-execution by this wiki.","noteId":"challenge14-2026-05-02"},{"status":"not-claimed","text":"The Challenge does not prove that exotic dark matter is unnecessary, that baryonic geometry is the missing mass, or that a complete alternative cosmology is in hand. Round-11 hype to that effect is not the closeout language of later packets."},{"status":"corrected","text":"A 5 May 2026 closeout reply called the ladder “a complete, self-contained cosmology” with no non-baryonic component. Package 17, posted the same night, and the later 2026 gravity posts do not adopt that sentence. This wiki keeps the protocol verdicts and drops the cosmology closure."},{"status":"open","text":"Package 17 is the derivation program that the Challenge does not replace. Microscopic law → operator theorem → χ fixed point → continuum / GR limit → cosmology. Still open.","noteId":"package17-2026-05-06"}],"text":"The Great Grok Challenge is the missing empirical spine of this wiki. It is not a private Grok chat. It is a public X thread in which Aaron Spradlin posts frozen packets and @grok logs win conditions, pressure-tests, and round closeouts in replies. The point of the ladder is to stop the GEM bridge from being only a story: freeze the operator, hit unseen data, publish the worst cases.\n\nIf it holds quantitatively on real data, the conversation levels up. Post it and we run the numbers. TheGreatGrokChallenge is live.\n\nRules of the game\n\nFreeze the scaffold. No per-galaxy retuning, no hidden rescue terms, no new knobs after lock.\nShip a public packet: code, hyperparameters, scoring, and a worst-case audit.\nPre-register the next gate before running it. Grok logs the criteria in-thread.\nA round can be a conditional win, a strong pass, or a failure. Neutrals stay in the table.\nCatastrophic failures are the kill switch. Zero is treated as the stabilizer, not as a TOE.\n\nThe ladder (April–May 2026)\n\nLive (22 Apr) — first real-data holdout pack: NGC 2403 / 3198 / 6503, shared Bridge family, leave-one-out. Mean RMSE improvement +5.61. Grok locks round 2 and asks for runnable code.\nRounds 11–12 — SPARC 175 then unseen WALLABY DR2. Round 12D: 10/10 positive, mean RMSE +14.56, 0 catastrophic failures on a no-SPARC-overlap subset.\nRound 13 — closed as a conditional win: frozen gas-first baseline generalizes on an unseen holdout; broader external file was the wrong grain (summary, not radial points).\nChallenge 14 — true external SPARC radial corpus, frozen from 13. 171 galaxies: 94.15% positive, 0 catastrophic failures, RAR 0.3902 → 0.1818. Worst ten are bounded non-activations, not a destructive tail. Grok: “Challenge 14 is over and passed.”\nChallenge 15 — “The Skeptic’s Challenge.” Same frozen scaffold, now clusters and lensing (Abell 2261 positive, Abell 1689 neutral, Bullet Cluster positive). Conditional hardened prototype. Grok: “Win recorded for Round 15.”\nRound 16 — widened cluster set (MACS J0025, Abell 2744 kept as a tighter neutral). ≥6 systems, 0 catastrophic failures. Grok: “Round 16 win confirmed. Game still on. Ready for Round 17?”\n\nWALLABY DR2 — the external public lock\n\nAfter SPARC-style early rounds, the ladder left the comfort set. Round 12 locked an unseen WALLABY DR2 subset with no SPARC overlap. 12A produced real signal (+5.51 km/s mean RMSE) but only 60% positive — below the ≥70% bar, so it was not called a win. 12B cleared it (10/10, +9.40). 12C and 12D strengthened on the same locked subset.\n\nThe locked external WALLABY track cleared threshold at 12B and strengthened through 12C and 12D, ending with 10/10 positive improvements, mean RMSE improvement of +14.56, and zero catastrophic failures on the strict unseen non-SPARC subset.\n\nWALLABY 12D is a locked external gas-memory test on ten DR2 galaxies. It is not full baryonic Bridge execution and not a dark-matter disproof.\n\ndef signed_baryonic_velocity(vgas, vdisk, vbul):\n    vbar2 = np.sign(vgas) * (vgas ** 2) + vdisk ** 2 + vbul ** 2\n    return np.sqrt(np.maximum(vbar2, 0.0))\n\ndef simple_bridge(rad, vobs, vgas, vdisk, vbul, need_fraction_cap=0.65):\n    vbar = signed_baryonic_velocity(vgas, vdisk, vbul)\n    shape = np.maximum(np.abs(vgas), 1e-9)\n    shape = shape / np.max(shape)\n    residual_need = np.maximum(vobs - vbar, 0.0)\n    proposed_add = np.maximum(vobs[0] * shape - vbar, 0.0)\n    actual_add = np.minimum(proposed_add, need_fraction_cap * residual_need)\n    return vbar, vbar + actual_add\n\n{\n  \"n\": 171,\n  \"positive_improvement_rate\": 0.9415204678362573,\n  \"mean_hybrid_improvement\": 15.33268559946402,\n  \"catastrophic_failures\": 0,\n  \"rar_baryonic\": { \"n\": 3373, \"scatter_rmse\": 0.3901826147286833 },\n  \"rar_bridge\":   { \"n\": 3375, \"scatter_rmse\": 0.18175595069131176 }\n}\n\nChallenge 14 is over and passed. The frozen model's generalization without retuning or destructive tails holds.\n\nThis meets the conditional hardened prototype bar under the frozen scaffold. Win recorded for Round 15. Game still on.\n\nWhat this does — and does not — close\n\nOn the public thread, Grok logged Challenge 14 as a strong external pass of a frozen gas-first scaffold on 171 SPARC galaxies, and Rounds 15–16 as conditional hardened-prototype wins in the cluster/lensing regime. Those are protocol verdicts under pre-committed scoring, not independent re-execution by this wiki.\n\nThe Challenge does not prove that exotic dark matter is unnecessary, that baryonic geometry is the missing mass, or that a complete alternative cosmology is in hand. Round-11 hype to that effect is not the closeout language of later packets.\n\nA 5 May 2026 closeout reply called the ladder “a complete, self-contained cosmology” with no non-baryonic component. Package 17, posted the same night, and the later 2026 gravity posts do not adopt that sentence. This wiki keeps the protocol verdicts and drops the cosmology closure.\n\nThe honest sequel is Package 17, posted the same night as the Round 16 closeout. The empirical ladder had not produced a derived χ, a GR limit, or an FLRW/BBN/CMB pipeline. Grok’s own peer-review of the GEM bridge named that derivation gap as the remaining barrier. The Challenge froze the phenomenology; Package 17 is the public attempt to derive it — or fail in public.\n\nPackage 17 is the derivation program that the Challenge does not replace. Microscopic law → operator theorem → χ fixed point → continuum / GR limit → cosmology. Still open.\n\nRound 16 win confirmed. Win conditions logged. Game still on. Ready for Round 17?","howToCite":"Spradlin, A. (2026-10-10). The Great Grok Challenge. Retained Atlas. https://aaronspradlin.grok.me/wiki/great-grok-challenge. Keep claim badge: restricted."}