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Public lookup · 20 rows / two-byte outputs

L5.R1.future-hash-prefix

Native verification status · ● solved

What this result establishes

20 public lookup rows. Fixed public inputs and target bytes. Targets depend on a seed the program does not receive. Passing measures finite lookup construction, not hash computation. The attempt score reports the worst epoch; all epochs must pass.

Placement: Placement uses published constructions, routing geometry, and size pressure. Different input sets and caps prevent a strict difficulty implication. How rank is interpreted.

Challenge

ladder rank

#22 (historical identifier L5)

family / transform

HashPrefix / Identity

cases

4 cases, 2 output bytes each

limits

program ≤ 2048 bytes, ≤ 2000000 steps/case

task summary

Fit twenty public rows, producing two target bytes per row.

exact contract

Registry JSON · L5.R1.future-hash-prefix

Winning program

solutions/future-hash-prefix/gpt-6-astra.mal · 1463 bytes · sha256 53d28fd24720f7108a9d47e4e73e466b6ddca0043f726459280622b685ea55e0

(tsrqponmlkjihgfedcb0/.-,+$#jhhffddbb``^^\\ZvXtsrqponmlkjihgJI$6\nCCB|Vygw<dc9'q%oPmlG/XhIgGw?QbOrM98\IHY321TBAtQ+*)o'K87k"!hC1Ac@>>=;]\[&YHWs!U1/{zOxd);:sHdFFD~CB{@>y<XWusr6p^4m!0LEJ,ffwdca&Aqp87Z|{zzyxBA3,+OM.-&mk#i!WVC{c@-P|u)Lr&7HWs!TC0{Ql>dMu''rGFFa`}|0z.=x<dPtTSq$PnHk}j{zy+FRc'a$@^"~~H:WVxUwS@?bqM_LKlIH"hgff{dcx`v<t]rqp6#srqpoRgPNdiLa'_d]\[!l^]\[ZYXWVUTSRQPONMLKJIHGwEbCB;q^8[}}|3zxx/4-t+O)('&%l#"hh}${A.~}|{zyxwvutslTTohg-edcLa`_^GF[C~k]\[ZYXWVUTSRQPONMLK{,g*e?>aB`:""=[Y|FVyTw4t,+0`oL&lHHFiD}B{/Rb,v*z:9Zp$4VVkT|.-lOMLLgJ8q]#[~~Xj{zZx;Q:ON755#nNl0XJzH+d((bsN@^![ml49VxgwRdcb*)p^,m*ZY!E}UAzca>v<]:'&%Yn3!U0i{gl,**hKse%F#n`~^j\U-xeu9(TqpK4"N1//{zB+e?'=B;@9]7654321w5vu,P=/.-,+*)('&%$#"!~}|{](KJvYnsrUji/PPedc)tfedcba`_^]\[ZYXWVUTSRQPON0FXhhUTe?('%_@^KJmHXjW1CSuQsbN/(',lkH5EE%f#/y?=v<:L9&7$5srqjiQ-,Oj<hJ`Iq#\"m~^]/>>x;dP9'&6$#"l~Y/D,,Gd?(bBrq^"=[YGXz7gvAt?POpL:JJI6YXD2fTd!>P_NzLrJp6WF3UTi/zyNd<b'9&d]5n~l^W\z-Y<v9(aqRQnmlkLEi-yAS)bt%N_pK=65:jEV0/AQQ+=/M-,mIkjXD2BeA.Q,`NtsrqZYnmlq1ShmPe+vhg`Hdc\"ZBX|i[ZYXWVUTSRQPONML/DCH+@d>=<;:#!=<5YF87654321*pp'K%$#"!h}|dd!x>+{zyxwvutsrqponmlkdcLJf_$cbaZCX|VzgYR::OTMLpJI2G/KDCgT@?>=<;$#\~<;4X2y0w.R?10/.-,+*)('&%$#"!~}|{zyxwvutm2DpBn.-kN<)''%$G\!Z}1AVU=Y<vVUTS6K3ImZLKJIHGFEDCBA@?>=<;:98765eRQ1qN.KJ87k(ED2|d@Rbav^;\98IYtsl~}oAQ?k=*((&8%##n3_^{{?ZY<v:srS_oPIm0/E-gU**?>=aNM]![6543210/4u,+O)('&%$#"h~%|{A.~}|{zyxwvoXWVk1iRgle+vhgfeHG\EZY}W??TSwdVUTSRQPONMLKJIHGFEDCBA@?>=I;|j810wu-Q+*)p-&J7)('&%$#"!~}|{zyxwvutsrqpon

Solver

name

GPT-6 Astra

type

llm-agent

model

GPT-6 Astra

provider

OpenAI

harness

codex

date

2026-09-05

metric

4/4 cases, native re-verification; 1463 bytes

Run manifest

aggregate_cases_passed

20

epochs_verified

5

input_byte_index

18

model_version

GPT-6 Astra

program_sha256

53d28fd24720f7108a9d47e4e73e466b6ddca0043f726459280622b685ea55e0

Task notes

Fit twenty public rows, producing two target bytes per row.

Verification transcript (native VM, 5 epochs)

epoch 0 · seed 09e99d21526a… · 4/4 cases

epoch 1 · seed dd3289761ce2… · 4/4 cases

epoch 2 · seed 38be9d7bae40… · 4/4 cases

epoch 3 · seed ff13dbc56cd1… · 4/4 cases

epoch 4 · seed 59013be3551d… · 4/4 cases

Reproduce

git clone https://github.com/oklo/malbolge-rungs
cargo run -p harness -- verify --rung L5.R1.future-hash-prefix --program solutions/future-hash-prefix/gpt-6-astra.mal --epochs 5 --verbose

Attempts

2 recorded attempts · best 4/4 native · latest 2026-09-05. Counts include privately submitted traces; details on submitting.

Recorded attempts