TIS-100 Bench: Prolonged Sequence Sorter

NEXUS.19.762.9 Hard Sequence algorithms Memory & interpreters Built-in puzzle · TIS-100 Bench report →

Sort longer sequences terminated by −1. Buffer capacity and movement between memory nodes become central constraints.

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. 9 of 16 models solved it. Together they found 10 new Pareto-frontier points beyond the community leaderboard.

9 / 16models solved it
903best LLM cycles (338 community)
10new frontier points

Records

ScoreCommunity bestBest LLMModel
Cycles338903Opus 5.5 · +167%
Nodes34Fable 5.1 · +33%
Instructions2834Gemini 4 Argon · +21%

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

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Every model

ModelSolvedBest cyclesBest nodesBest instructionsNew frontier points
01Opus 5.5Yes90344310
02GPT-6.1 SolYes1,1434451
03Fable 5.1Yes1,025442—
04GPT-6 AstraYes1,220442—
05Sonnet 5.5Yes1,222551—
06Gemini 4 ArgonYes1,486434—
07Kimi K3.1 ProYes1,544446—
08Gemini 3.8 FlashYes2,260450—
09Grok 4.7Yes2,284444—
10DeepSeek V4.1 FlashNo————
11GLM-5.3No————
12Haiku 5.5No————
13MiMo-V2.6-ProNo————
14Muse Spark 1.3No————
15Muse Wonder 1.0No————
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.

Opus 5.5 Fewest cycles★ New frontier point

903 cycles · 5 nodes · 67 instructionsNEXUS.19.762.9.903-5-67.txt on GitHub

Opus 5.5 program running on NEXUS.19.762.9 in TIS-100
Node 0
MOV 9,LEFT
MOV 9,LEFT
MOV 9,LEFT
MOV 9,LEFT
MOV 9,LEFT
MOV 9,LEFT
MOV 9,LEFT
MOV 9,LEFT
MOV 9,LEFT
MOV 9,LEFT
MOV 9,LEFT
S: MOV UP,ACC
MOV ACC,DOWN
MOV ACC,DOWN
JMP S
Node 3
S: JRO RIGHT
MOV DOWN,UP
MOV DOWN,UP
MOV DOWN,UP
MOV DOWN,UP
MOV DOWN,UP
MOV DOWN,UP
MOV DOWN,UP
MOV DOWN,UP
MOV DOWN,UP
B: MOV UP,ACC
SUB 1
MOV ACC,UP
JMP S
MOV UP,DOWN
Node 4
MOV 9,ACC
S: SUB UP
JLZ G
JEZ G
F: MOV 14,LEFT
MOV 14,LEFT
SUB 2
JGZ F
G: ADD 10
MOV ACC,LEFT
MOV UP,ACC
JLZ E
JMP S
E: MOV ACC,DOWN
Node 7
MOV 10,LEFT
MOV UP,ACC
N: MOV LEFT,RIGHT
ADD 1
H: JRO RIGHT
MOV ACC,DOWN
MOV ACC,DOWN
MOV ACC,DOWN
MOV ACC,DOWN
MOV ACC,DOWN
MOV ACC,DOWN
MOV ACC,DOWN
MOV ACC,DOWN
JRO RIGHT
MOV -1,DOWN
Node 8
S: MOV LEFT,ACC
L: JGZ D
MOV 1,LEFT
MOV -9,LEFT
ADD 8
JMP L
D: MOV ACC,LEFT
MOV -11,LEFT

Opus 5.5 Fewest nodes★ New frontier point

1,053 cycles · 4 nodes · 59 instructionsNEXUS.19.762.9.1053-4-59.txt on GitHub

Opus 5.5 program running on NEXUS.19.762.9 in TIS-100
Node 0
MOV 0,LEFT
MOV 0,LEFT
MOV 0,LEFT
MOV 0,LEFT
MOV 0,LEFT
MOV 0,LEFT
MOV 0,LEFT
MOV 0,LEFT
MOV 0,LEFT
MOV 0,LEFT
MOV 0,LEFT
S: MOV UP,ACC
MOV ACC,DOWN
MOV ACC,DOWN
JMP S
Node 3
S: JRO RIGHT
MOV DOWN,UP
MOV DOWN,UP
MOV DOWN,UP
MOV DOWN,UP
MOV DOWN,UP
MOV DOWN,UP
MOV DOWN,UP
MOV DOWN,UP
MOV DOWN,UP
B: MOV UP,ACC
ADD 1
MOV ACC,UP
JMP S
MOV UP,DOWN
Node 4
MOV 9,ACC
S: SUB UP
JLZ G
JEZ G
F: MOV 14,LEFT
MOV 14,LEFT
SUB 2
JGZ F
G: ADD 10
MOV ACC,LEFT
MOV UP,ACC
JLZ E
JMP S
E: MOV ACC,DOWN
Node 7
MOV -1,LEFT
MOV UP,NIL
D: MOV LEFT,ACC
JGZ L
JEZ N
MOV ACC,DOWN
L: SWP
MOV ACC,DOWN
SWP
SUB 1
JNZ L
N: SWP
ADD 1
SWP
JMP D

Gemini 4 Argon Fewest instructions

2,597 cycles · 4 nodes · 34 instructionsNEXUS.19.762.9.2597-4-34.txt on GitHub

Gemini 4 Argon program running on NEXUS.19.762.9 in TIS-100
Node 0
MOV UP, DOWN
Node 3
MOV 0, UP
MOV RIGHT, ACC
JEZ RST
L1: MOV DOWN, UP
SUB 1
JGZ L1
MOV DOWN, ACC
ADD 7
L2: MOV ACC, DOWN
MOV UP, ACC
JNZ L2
RST:
Node 4
O: JRO DOWN
ADD 1
JMP O
IN: MOV UP, ACC
ADD 1
MOV ACC, LEFT
JGZ IN
MOV -1, ACC
MOV ACC, DOWN
Node 7
MOV 7, LEFT
MOV 11, ACC
I: MOV 1, LEFT
SUB 1
JNZ I
MOV 3, UP
MOV UP, NIL
N: MOV LEFT, ACC
L: MOV ACC, UP
SUB 7
JLZ N
MOV UP, DOWN
JMP L