Round 5
One saved weekly assessment of Pure iron favours bcc over hcp at 330 GPa and 6000 K., kept as it was published. It is an estimate from three models reading the evidence, not proof the hypothesis holds, and it did not set any price.
- Published
- Nov 10, 2026 09:33 PM EST
- Estimate
- 20%
- Range the models covered
- 16–25%
- Confident binary
- No unanimous verdict this round.
- Methodology
- panel-v9
- Round hash
0648d0d044acd03be6cf58e1e8a4c69cda7c8776a03095f4af26e4156f5c8182
The hash commits to this round's recorded bytes. It does not prove the wording is sound or that the science is right.
openai/gpt-6.1-sol
The retrieved calculations favor hcp, lowering my support for the proposed negative free-energy difference. However, the exact-state 2023 calculation lets bcc transform rather than measuring its constrained-basin free energy, while the 2026 study does not establish the required independently reproduced, exact-state 95% intervals including electronic-structure uncertainty. Neither terminal criterion is demonstrated; no verified signed evidence cutoff was supplied.
What would change this view: Independent exact-state calculations with fully budgeted 95% intervals below zero would reverse my assessment; intervals wholly nonnegative would support a definite contrary verdict.
anthropic/claude-sonnet-5.5
Published first-principles results disagree on the bcc–hcp ordering of iron near inner-core conditions. Belonoshko and co-workers favour bcc, while most free-energy studies and the named crystal-structure-prediction paper favour hcp. I found no set of independently implemented calculations at exactly 330 GPa and 6000 K with 95% intervals that all fall on one side of zero. So neither YES nor NO is established. I did not run a live search, so this rests on recalled literature.
What would change this view: Several independently implemented anharmonic free-energy calculations at 330 GPa and 6000 K with full error bars all giving bcc lower (raising the estimate) or all giving hcp lower (lowering it).
No sources recorded for this answer.
x-ai/grok-4.7
At the stated state point, the peer-reviewed T-USPEX/PBE calculation finds a bcc seed relaxes to hcp, so bcc is not stable in its crystalline basin and no constrained G_bcc-G_hcp 95% interval wholly below zero exists. Older MD favoring bcc is model-dependent and lacks the required independent error budget. Basin instability plus unresolved electronic-structure error leaves the comparison undecided.
What would change this view: Two independent peer-reviewed calculations with 95% intervals for constrained G_bcc-G_hcp at 330 GPa and 6000 K wholly below zero.
Round 5: score 0.20
OpenAI estimated 0.25. The retrieved calculations favor hcp, lowering my support for the proposed negative free-energy difference. However, the exact-state 2023 calculation lets bcc transform rather than measuring its constrained-basin free… Anthropic estimated 0.20. Published first-principles results disagree on the bcc–hcp ordering of iron near inner-core conditions. Belonoshko and co-workers favour bcc, while most free-energy studies and the named crystal-structure-prediction… xAI estimated 0.16. At the stated state point, the peer-reviewed T-USPEX/PBE calculation finds a bcc seed relaxes to hcp, so bcc is not stable in its crystalline basin and no constrained G_bcc-G_hcp 95% interval wholly below zero exists.… The three models did not return a unanimous confident binary, so the market is not decided.
No audit bundle is recorded for this round. A bundle from another round is not substituted for it.