TIS-100 Bench: Submaximum Selector

NEXUS.07.050.0 Hard Sequence algorithms Routing & synchronization Built-in puzzle · TIS-100 Bench report →

Select the second-largest of four inputs. Keeping the top two candidates is enough; fully sorting is another option.

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. 16 of 16 models solved it. Together they found 4 new Pareto-frontier points beyond the community leaderboard.

16 / 16models solved it

414best LLM cycles (336 community)

4new frontier points

Records

Score	Community best	Best LLM	Model
Cycles	336	414	Kimi K3.1 Pro · +23%
Nodes	6	6	GPT-6 Astra Ties record
Instructions	31	40	GPT-6 Astra · +29%

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

Lower is better ↙

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Community leaderboardModel frontier pointNew frontier point

Select a point with the mouse or keyboard to inspect its scores and program.

Community leaderboardModel frontier pointNew frontier pointNodes are not shown; lower is better on both axes.

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Every model

Model	Solved	Best cycles	Best nodes	Best instructions	New frontier points
01GPT-6 Astra	Yes	480	6	40	3
02Opus 5.5	Yes	443	6	47	1
03Kimi K3.1 Pro	Yes	414	7	55	—
04Fable 5.1	Yes	418	7	49	—
05Muse Wonder 1.0	Yes	438	7	57	—
06Gemini 4 Argon	Yes	446	6	49	—
07Sonnet 5.5	Yes	484	6	50	—
08GPT-6.1 Sol	Yes	496	6	48	—
09Gemini 3.8 Flash	Yes	503	7	63	—
10Grok 4.7	Yes	539	8	64	—
11Haiku 5.5	Yes	560	8	64	—
12MiMo-V2.6-Pro	Yes	586	10	67	—
13GLM-5.3	Yes	598	7	55	—
14GPT-6 Luna	Yes	619	8	78	—
15DeepSeek V4.1 Flash	Yes	654	8	70	—
16Muse Spark 1.3	Yes	937	10	75	—

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.

Kimi K3.1 Pro Fewest cycles

414 cycles · 10 nodes · 62 instructionsNEXUS.07.050.0.414-10-62.txt on GitHub

Kimi K3.1 Pro program running on NEXUS.07.050.0 in TIS-100

Node 0

MOV UP,ACC
MOV ACC,RIGHT
MOV ACC,RIGHT
MOV RIGHT,DOWN

Node 1

S: MOV UP,ACC
SAV
SUB LEFT
JLZ W
SWP
MOV ACC,DOWN
MOV LEFT,LEFT
JMP S
W: MOV LEFT,DOWN
SWP
MOV ACC,LEFT

Node 2

S: MOV UP,ACC
SAV
SUB RIGHT
JLZ W
SWP
MOV ACC,DOWN
MOV RIGHT,RIGHT
JMP S
W: MOV RIGHT,DOWN
SWP
MOV ACC,RIGHT

Node 3

MOV UP,ACC
MOV ACC,LEFT
MOV ACC,LEFT
MOV LEFT,DOWN

Node 4

MOV UP,RIGHT

Node 5

S: MOV UP,ACC
MOV ACC,RIGHT
JRO RIGHT
MOV LEFT,NIL
MOV ACC,DOWN
JMP S
W: MOV LEFT,DOWN

Node 6

S: MOV UP,ACC
SAV
SUB LEFT
JLZ W
MOV 1,LEFT
MOV RIGHT,DOWN
JMP S
W: MOV 4,LEFT
MOV RIGHT,NIL
SWP
MOV ACC,DOWN

Node 7

MOV UP,LEFT

Node 8

MOV UP,ACC
MOV ACC,RIGHT
MOV ACC,RIGHT

Node 9

S: MOV UP,ACC
SAV
SUB LEFT
JLZ W
MOV LEFT,NIL
SWP
MOV ACC,DOWN
JMP S
W: MOV LEFT,DOWN

GPT-6 Astra Fewest nodes

621 cycles · 6 nodes · 57 instructionsNEXUS.07.050.0.621-6-57.txt on GitHub

GPT-6 Astra program running on NEXUS.07.050.0 in TIS-100

Node 0

MOV UP ACC
MOV ACC RIGHT
MOV ACC RIGHT
MOV ACC RIGHT
MOV ACC RIGHT

Node 1

S: MOV UP ACC
SUB LEFT
JLZ A
ADD LEFT
MOV ACC RIGHT
MOV ACC RIGHT
MOV LEFT RIGHT
MOV LEFT NIL
JMP S
A: MOV LEFT RIGHT
MOV LEFT RIGHT
ADD LEFT
MOV ACC RIGHT

Node 2

S: MOV UP ACC
SUB RIGHT
JLZ A
ADD RIGHT
MOV ACC DOWN
MOV LEFT DOWN
MOV RIGHT DOWN
JMP M
A: MOV RIGHT DOWN
MOV LEFT DOWN
ADD RIGHT
MOV ACC DOWN
M: MOV LEFT DOWN
MOV LEFT DOWN

Node 3

MOV UP ACC
MOV ACC LEFT
MOV ACC LEFT
MOV ACC LEFT

Node 6

MOV UP ACC
SAV
SUB UP
JLZ A
MOV UP ACC
MOV UP DOWN
MOV UP NIL
JMP O
A: SWP
MOV UP NIL
MOV UP NIL
MOV UP DOWN
O: MOV ACC DOWN
MOV ACC DOWN

Node 9

S: MOV UP ACC
SUB UP
JGZ A
MOV UP DOWN
JMP S
A: ADD UP
MOV ACC DOWN

GPT-6 Astra Fewest instructions

1,542 cycles · 6 nodes · 40 instructionsNEXUS.07.050.0.1542-6-40.txt on GitHub

Node 0

MOV UP RIGHT

Node 1

MOV LEFT RIGHT
MOV UP RIGHT

Node 2

MOV LEFT DOWN
MOV LEFT ACC
MOV ACC DOWN
MOV ACC DOWN
MOV -10 DOWN
MOV UP ACC
MOV ACC DOWN
MOV ACC DOWN
MOV -10 DOWN
MOV RIGHT ACC
MOV ACC DOWN
MOV ACC DOWN
MOV -11 DOWN

Node 3

MOV UP LEFT

Node 6

MOV UP ACC
L: SAV
SUB UP
JGZ A
MOV UP ACC
SWP
JMP O
A: MOV UP ACC
O: MOV ACC DOWN
MOV ACC DOWN
SWP
JRO UP

Node 9

MOV UP NIL
MOV UP ACC
SUB UP
SUB 999
ADD 999
ADD UP
SUB UP
SUB 999
ADD 999
ADD UP
MOV ACC DOWN

Records

Pareto frontier

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Every model

Best model programs

Kimi K3.1 Pro Fewest cycles

GPT-6 Astra Fewest nodes

GPT-6 Astra Fewest instructions