GPT-5.6 Luna

OpenAI·Jul 9, 2026·5 reasoning variants

GPT-5.6 Luna is the budget tier of the GPT-5.6 family and is was effectively non-functional against ARC-AGI-3. It scores 0% on Public and 0.18% on Semi-Private. Like Terra it fails to benefit from extra effort — Luna `xhigh` is essentially flat with `high`.

Related models: GPT-5.6 Sol, GPT-5.6 Terra

ARC-AGI 3 leaderboard

GPT-5.6 Luna

Verified scores

Variant	ARC-AGI-1	ARC-AGI-2	ARC-AGI-3
Max	88.0%	59.5%	0.18%
XHigh	87.7%	47.6%	0.02%
High	76.5%	29.3%	0.10%
Medium	56.5%	7.4%	0.17%
Low	34.2%	5.1%	0.17%

Tasks & environments

Pass/fail per reasoning level across each benchmark.

ARC-AGI-3 Public Demo

25 environments


AR25	0.0%	0.0%	0.0%	0.0%	0.0%
BP35	0.0%	0.0%	0.0%	0.0%	0.0%
CD82	0.0%	0.0%	0.0%	0.0%	0.0%
CN04	0.0%	0.0%	0.0%	0.0%	0.0%
DC22	0.0%	0.0%	0.0%	0.0%	0.0%
FT09	0.0%	0.0%	0.0%	0.0%	0.0%
G50T	0.0%	0.0%	0.0%	0.0%	0.0%
KA59	0.0%	0.0%	0.0%	0.0%	0.0%
LF52	0.0%	0.0%	0.0%	0.0%	0.0%
LS20	0.0%	0.0%	0.0%	0.0%	0.0%
M0R0	0.0%	0.0%	0.0%	0.0%	0.0%
R11L	0.0%	0.0%	0.0%	0.0%	0.0%
RE86	0.0%	0.0%	0.0%	0.0%	0.0%
S5I5	0.0%	0.0%	0.0%	0.0%	0.0%
SB26	0.0%	0.0%	0.0%	0.0%	0.0%
SC25	0.0%	0.0%	0.0%	0.0%	0.0%
SK48	0.0%	0.0%	0.0%	0.0%	0.0%
SP80	0.0%	0.0%	0.0%	0.0%	0.0%
SU15	0.0%	0.0%	0.0%	0.0%	0.0%
TN36	0.0%	0.0%	0.0%	0.0%	0.0%
TR87	0.0%	0.0%	0.0%	0.0%	0.0%
TU93	0.0%	0.0%	0.0%	0.0%	0.0%
VC33	0.0%	0.0%	0.0%	0.0%	0.0%
WA30	0.0%	0.0%	0.0%	0.0%	0.0%
LP85	0.0%	0.0%	0.0%	0.8%	0.0%

ARC-AGI-2 Public Eval

120 tasks

Task	Max	XHigh	High	Medium	Low
0934a4d8	✓	✓	✗	✗	✗
135a2760	✗	✗	✗	✗	✗
136b0064	✓	✓	✓	✓	✗
13e47133	✗	✗	✗	✗	✗
142ca369	✓	✓	✗	✗	✗
16b78196	✗	✗	✗	✗	✗
16de56c4	✓	✓	✗	✗	✗
1818057f	✓	✓	✓	✗	✗
195c6913	✗	✗	✗	✗	✗
1ae2feb7	✓	✓	✓	✓	✗
20270e3b	✓	✓	✓	✗	✗
20a9e565	✓	✓	✗	✗	✗
21897d95	✗	✗	✗	✗	✗
221dfab4	✗	✗	✗	✗	✗
247ef758	✗	✗	✓	✗	✗
269e22fb	✗	✗	✗	✗	✗
271d71e2	✗	✗	✗	✗	✗
28a6681f	✗	✗	✗	✗	✗
291dc1e1	✓	✓	✓	✗	✗
2b83f449	✗	✗	✗	✗	✗
2ba387bc	✓	✓	✓	✓	✓
2c181942	✗	✓	✗	✗	✗
2d0172a1	✓	✗	✗	✗	✗
31f7f899	✓	✓	✓	✗	✗
332f06d7	✓	✗	✗	✗	✗
35ab12c3	✓	✗	✗	✗	✗
36a08778	✓	✓	✗	✗	✗
38007db0	✓	✓	✗	✗	✗
3a25b0d8	✗	✗	✗	✗	✗
3dc255db	✓	✗	✗	✗	✗
3e6067c3	✓	✗	✗	✗	✗
409aa875	✓	✓	✓	✗	✗
446ef5d2	✗	✗	✗	✗	✗
45a5af55	✓	✓	✓	✗	✗
4a21e3da	✓	✓	✗	✗	✗
4c3d4a41	✗	✗	✗	✗	✗
4c416de3	✓	✓	✗	✗	✗
4c7dc4dd	✗	✗	✗	✗	✗
4e34c42c	✗	✗	✗	✗	✗
53fb4810	✓	✓	✓	✓	✓
5545f144	✗	✗	✗	✗	✗
581f7754	✗	✗	✗	✗	✗
58490d8a	✓	✓	✓	✓	✓
58f5dbd5	✓	✓	✓	✗	✗
5961cc34	✗	✗	✗	✗	✗
5dbc8537	✓	✗	✗	✗	✗
62593bfd	✗	✗	✗	✗	✗
64efde09	✗	✗	✗	✗	✗
65b59efc	✓	✗	✗	✗	✗
67e490f4	✗	✗	✓	✗	✗
6e453dd6	✓	✓	✓	✗	✗
6e4f6532	✗	✗	✗	✗	✗
6ffbe589	✓	✗	✗	✗	✗
71e489b6	✗	✗	✗	✗	✗
7491f3cf	✓	✓	✓	✗	✗
7666fa5d	✓	✓	✗	✗	✗
78332cb0	✓	✗	✗	✗	✗
7b0280bc	✗	✗	✗	✗	✗
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7c66cb00	✓	✓	✗	✗	✗
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800d221b	✗	✗	✗	✗	✗
80a900e0	✓	✓	✗	✗	✗
8698868d	✗	✓	✗	✗	✗
88bcf3b4	✗	✗	✗	✗	✗
88e364bc	✗	✗	✗	✗	✗
89565ca0	✗	✗	✓	✗	✗
898e7135	✓	✓	✗	✗	✗
8b7bacbf	✗	✗	✗	✗	✗
8b9c3697	✓	✓	✗	✗	✗
8e5c0c38	✗	✗	✗	✗	✗
8f215267	✓	✓	✗	✗	✗
8f3a5a89	✓	✓	✓	✗	✗
9385bd28	✓	✗	✗	✗	✗
97d7923e	✓	✓	✓	✗	✗
981571dc	✓	✓	✓	✗	✗
9aaea919	✗	✓	✗	✗	✗
9bbf930d	✗	✗	✗	✗	✗
a251c730	✗	✗	✗	✗	✗
a25697e4	✗	✗	✗	✗	✗
a32d8b75	✗	✗	✗	✗	✗
a395ee82	✓	✓	✓	✗	✗
a47bf94d	✓	✓	✗	✗	✗
a6f40cea	✓	✗	✗	✗	✗
aa4ec2a5	✗	✗	✗	✗	✗
abc82100	✗	✗	✗	✗	✗
b0039139	✓	✗	✓	✗	✗
b10624e5	✗	✗	✗	✗	✗
b5ca7ac4	✗	✓	✗	✗	✗
b6f77b65	✗	✓	✗	✗	✗
b99e7126	✓	✓	✓	✗	✗
b9e38dc0	✗	✗	✗	✗	✗
bf45cf4b	✓	✓	✓	✓	✗
c4d067a0	✓	✓	✗	✗	✗
c7f57c3e	✗	✗	✗	✗	✗
cb2d8a2c	✓	✓	✗	✗	✗
cbebaa4b	✗	✗	✗	✗	✗
d35bdbdc	✓	✗	✗	✗	✗
d59b0160	✓	✓	✗	✗	✗
d8e07eb2	✓	✗	✗	✗	✗
da515329	✗	✗	✗	✗	✗
db0c5428	✗	✓	✗	✗	✗
db695cfb	✓	✓	✓	✗	✗
dbff022c	✗	✗	✗	✗	✗
dd6b8c4b	✓	✗	✗	✗	✗
de809cff	✗	✗	✗	✗	✗
dfadab01	✓	✓	✗	✗	✗
e12f9a14	✗	✗	✗	✗	✗
e3721c99	✗	✗	✗	✗	✗
e376de54	✓	✓	✓	✗	✗
e8686506	✓	✓	✓	✗	✗
e87109e9	✗	✗	✗	✗	✗
edb79dae	✓	✗	✗	✗	✗
eee78d87	✓	✓	✗	✗	✗
f560132c	✓	✓	✗	✗	✗
f931b4a8	✓	✗	✓	✗	✗
faa9f03d	✗	✗	✗	✗	✗
fc7cae8d	✓	✓	✗	✗	✗

ARC-AGI-1 Public Eval

400 tasks

Task	Max	XHigh	High	Medium	Low
00576224	✓	✓	✓	✓	✓
009d5c81	✓	✓	✓	✓	✓
00dbd492	✓	✓	✓	✓	✓
03560426	✓	✓	✓	✓	✗
05a7bcf2	✓	✗	✗	✗	✗
0607ce86	✗	✓	✗	✗	✗
0692e18c	✓	✓	✓	✓	✓
070dd51e	✓	✓	✓	✓	✗
08573cc6	✗	✓	✗	✗	✗
0934a4d8	✓	✓	✗	✗	✗
09c534e7	✓	✓	✗	✗	✗
0a1d4ef5	✓	✗	✓	✓	✗
0a2355a6	✓	✓	✓	✓	✗
0b17323b	✓	✓	✓	✓	✓
0bb8deee	✓	✓	✓	✓	✓
0becf7df	✓	✓	✗	✓	✓
0c786b71	✓	✓	✓	✓	✓
0c9aba6e	✓	✗	✓	✓	✗
0d87d2a6	✗	✗	✗	✗	✗
0e671a1a	✓	✓	✓	✓	✓
0f63c0b9	✓	✓	✓	✓	✗
103eff5b	✓	✓	✓	✓	✗
11e1fe23	✓	✓	✓	✗	✗
12422b43	✓	✓	✓	✓	✓
12997ef3	✓	✓	✓	✓	✓
12eac192	✓	✓	✗	✗	✗
136b0064	✓	✓	✓	✗	✗
13713586	✓	✓	✓	✗	✓
137f0df0	✓	✓	✓	✓	✓
140c817e	✓	✓	✓	✓	✓
14754a24	✓	✓	✓	✗	✗
15113be4	✗	✗	✓	✗	✗
15663ba9	✓	✓	✓	✗	✗
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16b78196	✗	✗	✗	✗	✗
17b80ad2	✗	✗	✓	✓	✗
17cae0c1	✓	✓	✓	✓	✓
18419cfa	✗	✓	✗	✗	✗
184a9768	✓	✓	✗	✗	✗
195ba7dc	✓	✓	✓	✓	✓
1990f7a8	✓	✓	✓	✗	✗
19bb5feb	✓	✓	✓	✓	✓
1a2e2828	✓	✓	✓	✓	✓
1a6449f1	✓	✓	✓	✓	✓
1acc24af	✗	✗	✗	✗	✓
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1c0d0a4b	✓	✓	✗	✓	✗
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1d0a4b61	✓	✓	✓	✓	✓
1d398264	✓	✓	✓	✓	✓
1da012fc	✓	✓	✓	✓	✗
1e81d6f9	✓	✓	✗	✓	✗
1e97544e	✓	✓	✓	✓	✓
2037f2c7	✓	✗	✗	✗	✗
2072aba6	✓	✓	✓	✓	✓
20818e16	✓	✓	✓	✓	✗
20981f0e	✓	✓	✓	✓	✓
212895b5	✓	✓	✗	✗	✗
21f83797	✓	✗	✓	✗	✗
22a4bbc2	✓	✓	✓	✓	✗
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2546ccf6	✗	✗	✗	✗	✗
256b0a75	✗	✗	✗	✗	✗
2685904e	✓	✓	✓	✓	✓
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2753e76c	✓	✓	✓	✓	✓
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52fd389e	✗	✗	✗	✓	✗
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