Claude Fable 5.2

Anthropic·Nov 9, 2026·10 harness configurations·$8 input / $40 output per 1M tokens

Claude Fable 5.2's best semi-private scores are 98.5% on v1 and 93.8% on v2, both at XHigh reasoning. On v3, it reaches 81.2% with the Standard harness at XHigh reasoning and 97.7% with the Provider Adapter harness at high reasoning. At max reasoning with the Standard harness, 28 of the 55 semi-private games ran for the full 12-hour limit, which capped how far testing could progress in those games.

ARC-AGI 3 leaderboard

Claude Fable 5.2Claude Fable 5.2 - Provider Adapter

Verified scores

Variant	ARC-AGI-1	ARC-AGI-2	ARC-AGI-3(Standard harness)	ARC-AGI-3(Provider Adapter harness)
Max	97.5%	92.5%	65.7%	94.9%
XHigh	98.5%	93.8%	81.2%	97.3%
High	97.5%	90.4%	79.3%	97.7%
Medium	97.5%	89.6%	73.3%	96.8%
Low	94.5%	86.7%	52.0%	92.3%

Tasks & environments

Pass/fail per reasoning level across each benchmark.

ARC-AGI-3 Public Demo - Standard harness

25 environments


AR25	100.0%	100.0%	100.0%	100.0%	100.0%
CD82	100.0%	100.0%	100.0%	100.0%	72.6%
CN04	100.0%	100.0%	100.0%	100.0%	100.0%
DC22	100.0%	100.0%	100.0%	100.0%	100.0%
FT09	100.0%	100.0%	100.0%	100.0%	100.0%
KA59	100.0%	100.0%	100.0%	89.9%	45.1%
LP85	100.0%	100.0%	100.0%	100.0%	100.0%
M0R0	100.0%	100.0%	100.0%	100.0%	89.7%
R11L	100.0%	100.0%	100.0%	100.0%	100.0%
S5I5	100.0%	100.0%	100.0%	100.0%	100.0%
SB26	100.0%	100.0%	100.0%	100.0%	100.0%
SC25	100.0%	89.7%	92.9%	74.7%	59.1%
SK48	100.0%	100.0%	100.0%	100.0%	99.3%
SP80	100.0%	100.0%	100.0%	100.0%	100.0%
TN36	100.0%	100.0%	100.0%	100.0%	91.0%
TR87	100.0%	100.0%	100.0%	100.0%	90.0%
VC33	100.0%	100.0%	100.0%	100.0%	100.0%
SU15	80.0%	94.4%	100.0%	95.5%	19.0%
RE86	77.8%	100.0%	100.0%	100.0%	70.2%
LS20	75.0%	100.0%	100.0%	100.0%	85.4%
TU93	31.2%	2.2%	2.0%	2.2%	2.2%
WA30	22.2%	100.0%	100.0%	100.0%	41.7%
BP35	20.5%	2.2%	1.0%	1.4%	1.0%
LF52	10.9%	5.5%	5.5%	4.8%	1.8%
G50T	3.2%	0.0%	0.3%	0.0%	0.0%

ARC-AGI-3 Public Demo - Provider Adapter harness

25 environments


AR25	100.0%	100.0%	100.0%	100.0%	100.0%
BP35	100.0%	100.0%	100.0%	100.0%	62.2%
CD82	100.0%	100.0%	100.0%	100.0%	100.0%
CN04	100.0%	100.0%	100.0%	100.0%	100.0%
DC22	100.0%	100.0%	100.0%	100.0%	100.0%
FT09	100.0%	100.0%	100.0%	100.0%	100.0%
G50T	100.0%	100.0%	100.0%	82.4%	93.7%
KA59	100.0%	100.0%	100.0%	100.0%	94.0%
LP85	100.0%	100.0%	100.0%	100.0%	100.0%
LS20	100.0%	100.0%	100.0%	100.0%	100.0%
M0R0	100.0%	100.0%	100.0%	100.0%	100.0%
R11L	100.0%	100.0%	100.0%	100.0%	100.0%
RE86	100.0%	100.0%	100.0%	100.0%	100.0%
S5I5	100.0%	100.0%	100.0%	100.0%	100.0%
SB26	100.0%	100.0%	100.0%	100.0%	100.0%
SC25	100.0%	100.0%	100.0%	100.0%	100.0%
SK48	100.0%	100.0%	100.0%	100.0%	100.0%
SP80	100.0%	100.0%	100.0%	100.0%	100.0%
TN36	100.0%	100.0%	100.0%	100.0%	100.0%
TR87	100.0%	100.0%	100.0%	100.0%	100.0%
TU93	100.0%	100.0%	100.0%	100.0%	100.0%
VC33	100.0%	100.0%	100.0%	100.0%	100.0%
WA30	100.0%	100.0%	100.0%	84.7%	99.1%
LF52	81.8%	100.0%	100.0%	100.0%	100.0%
SU15	13.3%	100.0%	100.0%	100.0%	100.0%

ARC-AGI-2 Public Eval

120 tasks

Task	Max	XHigh	High	Medium	Low
0934a4d8	✓	✓	✓	✓	✓
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ARC-AGI-1 Public Eval

400 tasks

Task	Max	XHigh	High	Medium	Low
00576224	✓	✓	✓	✓	✓
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Claude Fable 5.2

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

Future ARC Prize Competitions

ARC Prize: Newsletter

ARC-AGI-3 Public Demo - Standard harness

ARC-AGI-3 Public Demo - Provider Adapter harness