TIS-100 Bench: Sequence Mode Calculator

NEXUS.09.904.9 Hard Sequence algorithms Memory & interpreters Built-in puzzle · TIS-100 Bench report →

Find the most frequent value in each zero-terminated sequence. Output zero when the maximum frequency is tied.

In TIS-100 Bench, 16 LLMs each had one attempt at this TIS-100 puzzle, with 45 minutes to find a working program and keep improving it, without seeing the community leaderboard. 4 of 16 models solved it. Together they found 2 new Pareto-frontier points beyond the community leaderboard.

4 / 16models solved it
472best LLM cycles (287 community)
2new frontier points

Records

ScoreCommunity bestBest LLMModel
Cycles287472Gemini 4 Argon · +64%
Nodes35GPT-6 Astra · +67%
Instructions3660GPT-6 Astra · +67%

Community records from the community leaderboard when we froze it. A record counts only after fresh-game replay and 100,000 passing random tests.

Pareto frontier

Pareto explorer

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Community leaderboardModel frontier pointNew frontier point
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Every model

ModelSolvedBest cyclesBest nodesBest instructionsNew frontier points
01GPT-6 AstraYes7925602
02Gemini 4 ArgonYes472683—
03GPT-6.1 SolYes750793—
04Opus 5.5Yes787786—
05DeepSeek V4.1 FlashNo————
06Fable 5.1No————
07GLM-5.3No————
08Gemini 3.8 FlashNo————
09Grok 4.7No————
10Haiku 5.5No————
11Kimi K3.1 ProNo————
12MiMo-V2.6-ProNo————
13Muse Spark 1.3No————
14Muse Wonder 1.0No————
15Sonnet 5.5No————
16GPT-6 LunaNo————

Best scores can come from different programs. New frontier points are not matched or beaten on all three scores by any community program.

Best model programs

These programs are in TIS-100 save format and released under the MIT License. All of this puzzle’s model programs are on GitHub and Hugging Face.

Gemini 4 Argon Fewest cycles

472 cycles · 7 nodes · 99 instructionsNEXUS.09.904.9.472-7-99.txt on GitHub

Gemini 4 Argon program running on NEXUS.09.904.9 in TIS-100
Node 0
L: MOV UP, ACC
JEZ END
SUB 3
JNZ P
SWP
ADD 1
SWP
JMP L
END: MOV 0, DOWN
SWP
MOV ACC, DOWN
JMP L
P: MOV ACC, DOWN
Node 1
L: MOV RIGHT, ACC
JEZ END
ADD 1
JNZ P
SWP
ADD 1
SWP
JMP L
END: MOV 1, DOWN
SWP
MOV ACC, DOWN
MOV ACC, DOWN
JMP L
P: MOV -1, DOWN
Node 2
L: MOV UP, ACC
JGZ R
MOV ACC, LEFT
JEZ E
JMP L
R: MOV ACC, RIGHT
JMP L
E: MOV 0, RIGHT
MOV UP, ACC
MOV ACC, DOWN
SUB DOWN
MOV -10, DOWN
MOV ACC, DOWN
MOV DOWN, NIL
MOV 1, DOWN
Node 3
L: MOV LEFT, ACC
JEZ END
SUB 1
JNZ P
SWP
ADD 1
SWP
JMP L
END: MOV 1, DOWN
SWP
MOV ACC, DOWN
MOV ACC, DOWN
JMP L
P: MOV -1, DOWN
Node 4
S: MOV -1, ACC
L: ADD 1
JRO UP
SUB UP
JGZ W1
MOV UP, RIGHT
JLZ W2
MOV 0, RIGHT
JMP S
W2: MOV 2, RIGHT
JMP S
W1: ADD UP
MOV ACC, RIGHT
MOV 1, RIGHT
Node 5
MOV 3, ACC
SAV
L: MOV UP, ACC
SUB ANY
JLZ GT
MOV 0, UP
MOV LAST, NIL
JGZ LT
JMP S
GT: MOV ACC, UP
MOV LAST, ACC
S: SAV
LT: JRO UP
SWP
MOV ACC, DOWN
Node 6
S: MOV -1, ACC
L: ADD 1
JRO UP
SUB UP
JGZ W5
MOV UP, LEFT
JLZ W4
MOV 0, LEFT
JMP S
W4: MOV 4, LEFT
JMP S
W5: ADD UP
MOV ACC, LEFT
MOV 5, LEFT

GPT-6 Astra Fewest nodes

1,216 cycles · 5 nodes · 68 instructionsNEXUS.09.904.9.1216-5-68.txt on GitHub

GPT-6 Astra program running on NEXUS.09.904.9 in TIS-100
Node 0
JRO DOWN
MOV LEFT RIGHT
MOV LEFT RIGHT
MOV LEFT RIGHT
MOV LEFT RIGHT
MOV LEFT ACC
ADD 1
MOV ACC LEFT
JRO DOWN
MOV RIGHT LEFT
MOV RIGHT LEFT
MOV RIGHT LEFT
MOV RIGHT LEFT
MOV UP DOWN
Node 1
MOV 0 UP
MOV 0 UP
MOV 0 UP
MOV 0 UP
MOV 0 UP
MOV 13 RIGHT
MOV RIGHT ACC
SAV
L:MOV UP ACC
MOV ACC RIGHT
MOV ACC RIGHT
SWP
SUB 1
SAV
JNZ L
Node 2
E:MOV LEFT UP
L:MOV UP ACC
JEZ Z
MOV ACC UP
MOV ACC UP
JMP L
Z:MOV 5 ACC
MOV ACC LEFT
F:MOV LEFT DOWN
MOV LEFT DOWN
SUB 1
JNZ F
Node 5
L:SUB UP
JLZ N
JNZ O
MOV 6 RIGHT
JMP A
O:MOV 2 RIGHT
A:ADD UP
JMP W
N:MOV 1 RIGHT
MOV UP ACC
W:JRO RIGHT
MOV RIGHT DOWN
MOV 0 ACC
Node 6
S:MOV 5 ACC
L:JRO LEFT
SAV
A:SUB 1
JEZ E
MOV -10 LEFT
JMP L
T:SWP
MOV 0 ACC
SWP
JMP A
E:SWP
MOV 1 LEFT
MOV ACC LEFT

GPT-6 Astra Fewest instructions

1,239 cycles · 6 nodes · 60 instructionsNEXUS.09.904.9.1239-6-60.txt on GitHub

GPT-6 Astra program running on NEXUS.09.904.9 in TIS-100
Node 0
JRO DOWN
MOV LEFT RIGHT
MOV LEFT RIGHT
MOV LEFT RIGHT
MOV LEFT RIGHT
MOV LEFT ACC
ADD 1
MOV ACC LEFT
JRO DOWN
MOV RIGHT LEFT
MOV RIGHT LEFT
MOV RIGHT LEFT
MOV RIGHT LEFT
MOV UP DOWN
Node 1
MOV 5 ACC
I:MOV 0 UP
SUB 1
JNZ I
MOV 13 RIGHT
MOV RIGHT ACC
D:MOV UP DOWN
SUB 1
JNZ D
Node 2
E:MOV LEFT UP
L:MOV UP ACC
JEZ Z
MOV ACC UP
MOV ACC UP
JMP L
Z:MOV 5 LEFT
Node 4
MOV UP ACC
MOV ACC RIGHT
MOV ACC RIGHT
Node 5
L:SUB LEFT
JEZ T
JLZ N
MOV 2 RIGHT
JMP A
T:MOV 6 RIGHT
A:ADD LEFT
JMP W
N:MOV 1 RIGHT
MOV LEFT ACC
W:JRO RIGHT
MOV RIGHT DOWN
MOV 0 ACC
Node 6
S:MOV 5 ACC
L:JRO LEFT
SAV
A:SUB 1
JEZ E
MOV -10 LEFT
JMP L
T:SWP
MOV 0 ACC
SWP
JMP A
E:SWP
MOV 1 LEFT
MOV ACC LEFT