Claude Haiku 5.5

Anthropic·Oct 7, 2026·6 harness configurations

Claude Haiku 5.5's best Semi-Private scores are 89.0% on v1 at max reasoning and 61.3% on v2 at xhigh reasoning. The v1 max score counts incomplete tasks as incorrect; that run completed 93 of 100 tasks. We omit v2 max due to lower task coverage, with 74 of 120 tasks complete; many incomplete attempts failed to return parseable answers, consistent with max reasoning exhausting the available output budget. On v3, Haiku 5.5 reaches 0.5% with the Standard harness and 2.8% with the Provider Adapter harness, both at max reasoning.

ARC-AGI 3 leaderboard

Claude Haiku 5.5Claude Haiku 5.5 - Provider Adapter

Verified scores

Variant	ARC-AGI-1	ARC-AGI-2	ARC-AGI-3(Standard harness)	ARC-AGI-3(Provider Adapter harness)
Max	89.0%	—	0.45%	2.82%
XHigh	87.5%	61.3%	—	—
High	81.5%	30.7%	—	—
Medium	57.3%	9.4%	—	—
Low	50.3%	2.8%	—	—

Tasks & environments

Pass/fail per reasoning level across each benchmark.

ARC-AGI-3 Public Demo - Standard harness

25 environments


DC22	4.8%
SP80	4.8%
FT09	3.8%
VC33	3.4%
LP85	2.8%
WA30	2.2%
SB26	0.8%
SU15	0.4%
LF52	0.4%
S5I5	0.4%
AR25	0.0%
BP35	0.0%
CD82	0.0%
CN04	0.0%
G50T	0.0%
KA59	0.0%
LS20	0.0%
M0R0	0.0%
R11L	0.0%
RE86	0.0%
SC25	0.0%
SK48	0.0%
TN36	0.0%
TR87	0.0%
TU93	0.0%

ARC-AGI-3 Public Demo - Provider Adapter harness

25 environments


LP85	25.0%
SP80	7.7%
TU93	6.7%
VC33	5.4%
RE86	4.9%
CN04	4.8%
FT09	4.8%
R11L	4.8%
AR25	4.3%
WA30	4.1%
KA59	3.6%
CD82	3.3%
S5I5	0.7%
SU15	0.4%
G50T	0.3%
TR87	0.3%
BP35	0.0%
DC22	0.0%
LF52	0.0%
LS20	0.0%
M0R0	0.0%
SB26	0.0%
SC25	0.0%
SK48	0.0%
TN36	0.0%

ARC-AGI-2 Public Eval

120 tasks

Task	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	✗	✗	✓	✓
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3dc255db	✓	✗	✗	✗
3e6067c3	✗	✗	✗	✗
409aa875	✓	✗	✗	✗
446ef5d2	✗	✗	✗	✗
45a5af55	✗	✓	✗	✗
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53fb4810	✓	✓	✗	✗
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581f7754	✗	✓	✗	✗
58490d8a	✓	✓	✓	✗
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71e489b6	✓	✓	✗	✗
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7666fa5d	✓	✓	✗	✗
78332cb0	✓	✗	✗	✗
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7b3084d4	✓	✓	✗	✗
7b5033c1	✓	✓	✓	✗
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7c66cb00	✗	✗	✗	✗
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800d221b	✓	✗	✗	✗
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a251c730	✓	✓	✗	✗
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a395ee82	✗	✗	✗	✗
a47bf94d	✓	✗	✗	✗
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aa4ec2a5	✗	✗	✗	✗
abc82100	✗	✗	✗	✗
b0039139	✓	✓	✗	✗
b10624e5	✗	✗	✗	✗
b5ca7ac4	✓	✓	✗	✗
b6f77b65	✗	✗	✗	✗
b99e7126	✓	✓	✗	✓
b9e38dc0	✓	✗	✗	✗
bf45cf4b	✓	✓	✓	✓
c4d067a0	✗	✓	✗	✗
c7f57c3e	✓	✗	✗	✗
cb2d8a2c	✗	✗	✗	✗
cbebaa4b	✗	✓	✗	✗
d35bdbdc	✗	✗	✗	✗
d59b0160	✓	✓	✗	✗
d8e07eb2	✓	✓	✗	✗
da515329	✗	✗	✗	✗
db0c5428	✓	✓	✓	✗
db695cfb	✗	✗	✗	✗
dbff022c	✗	✗	✗	✗
dd6b8c4b	✓	✗	✗	✗
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dfadab01	✗	✗	✗	✗
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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	✓	✗	✗	✓	✗
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0934a4d8	✓	✗	✓	✗	✗
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0a1d4ef5	✓	✓	✓	✓	✓
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0b17323b	✓	✓	✓	✓	✓
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0d87d2a6	✗	✗	✗	✗	✗
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103eff5b	✓	✓	✓	✗	✗
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136b0064	✓	✓	✓	✓	✗
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18419cfa	✗	✓	✗	✗	✗
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1990f7a8	✓	✓	✓	✓	✓
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25094a63	✗	✓	✓	✓	✗
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256b0a75	✓	✗	✓	✗	✗
2685904e	✓	✓	✓	✓	✓
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2753e76c	✓	✓	✓	✓	✓
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310f3251	✓	✓	✓	✓	✓
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319f2597	✓	✓	✓	✓	✗
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55783887	✓	✓	✗	✓	✗
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5833af48	✓	✓	✓	✓	✗
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Claude Haiku 5.5

ARC-AGI 3 leaderboard

Verified scores

Tasks & environments

ARC-AGI-3 Public Demo - Standard harnessStandard harness enables a model to carry forward notes it chooses to keep with it throughout the environment.

ARC-AGI-3 Public Demo - Provider Adapter harnessThe Provider Adapter harness preserves opaque reasoning state between requests and uses compaction for longer conversations, allowing the model to reuse prior work.

ARC-AGI-2 Public Eval

ARC-AGI-1 Public Eval

ARC Prize 2026

ARC Prize: Newsletter

ARC-AGI-3 Public Demo - Standard harness

ARC-AGI-3 Public Demo - Provider Adapter harness