Chess Puzzles (Epoch AI) · Open Analysis

#	Model	Effort	Score	Cost / task	Harness
1	GPT-6 Astra Pro	max	76.0%	–	Epoch AI
2	GPT-6 Astra	max	74.0%	–	Epoch AI
3	GPT-5.6 Sol Pro	max	68.0%	–	Epoch AI
4	GPT-6.1 Sol	max	68.0%	–	Epoch AI
5	Opus 5.5	max	67.0%	–	Epoch AI
6	Gemini 3.7 Flash	high	66.0%	–	Epoch AI
7	GPT-5.5	xhigh	63.0%	–	Epoch AI
8	GPT-5.5 Pro	xhigh	62.0%	–	Epoch AI
9	GPT-5.2 Pro	xhigh	60.0%	–	Epoch AI
10	GPT-5.4 Pro	xhigh	59.0%	–	Epoch AI
11	Gemini 4	high	59.0%	–	Epoch AI
12	GPT-5.6 Sol	max	59.0%	–	Epoch AI
13	Sonnet 5.5	max	59.0%	–	Epoch AI
14	Gemini 3.8 Flash	high	58.0%	–	Epoch AI
15	GPT-6 Sol	max	56.0%	–	Epoch AI
16	Haiku 5.5	max	55.0%	–	Epoch AI
17	Opus 4.8	max	52.0%	–	Epoch AI
18	Gemini 3.1 Pro	high	51.0%	–	Epoch AI
19	GPT-5.2	xhigh	48.0%	–	Epoch AI
20	GPT-5 Pro	high	48.0%	–	Epoch AI
21	GPT-5.4	xhigh	48.0%	–	Epoch AI
22	Fable 5.1	max	48.0%	–	Epoch AI
23	DeepSeek V4.1 Flash	max	48.0%	–	Epoch AI
24	GPT-5.6 Terra	max	47.0%	–	Epoch AI
25	Fable 5	max	47.0%	–	Epoch AI
26	Qwen 3.8 Max	xhigh	46.0%	–	Epoch AI
27	DeepSeek V4 Pro 0813	max	46.0%	–	Epoch AI
28	GPT-5.4 Nano	xhigh	45.0%	–	Epoch AI
29	Gemini 3.5 Flash	high	45.0%	–	Epoch AI
30	Sonnet 5	max	45.0%	–	Epoch AI
31	GPT-5.6 Luna	max	43.0%	–	Epoch AI
32	Opus 5	max	43.0%	–	Epoch AI
33	GPT-5.1	high	42.0%	–	Epoch AI
34	Gemini 3.6 Flash	low	42.0%	–	Epoch AI
35	Opus 4.7	max	41.0%	–	Epoch AI
36	Grok 4.7	xhigh	41.0%	–	Epoch AI
37	Gemini 3 Flash	high	39.0%	–	Epoch AI
38	GLM 5.3	max	37.0%	–	Epoch AI
39	Kimi K3	high	37.0%	–	Epoch AI
40	o3	medium	37.0%	–	Epoch AI
41	Muse Spark 1.3	max	37.0%	–	Epoch AI
42	GPT-5	high	36.0%	–	Epoch AI
43	GPT-6 Luna	max	36.0%	–	Epoch AI
44	Grok 4.5	high	35.0%	–	Epoch AI
45	Muse Spark 1.1	xhigh	34.0%	–	Epoch AI
46	Mistral Large 4	high	33.0%	–	Epoch AI
47	Grok 4.6	xhigh	33.0%	–	Epoch AI
48	DeepSeek V4 Flash 0731	max	32.0%	–	Epoch AI
49	Grok 4.20	xhigh	29.0%	–	Epoch AI
50	Muse Spark 1.2	xhigh	27.0%	–	Epoch AI
51	Qwen 3.7 Max	max	26.0%	–	Epoch AI
52	GPT-5 Mini	high	24.0%	–	Epoch AI
53	GPT-5.4 Mini	high	23.0%	–	Epoch AI
54	Sonnet 4.6	max	23.0%	–	Epoch AI
55	GLM 5.2	max	22.0%	–	Epoch AI
56	o4 mini	medium	22.0%	–	Epoch AI
57	GPT-5 Nano	high	22.0%	–	Epoch AI
58	GLM 4.7	none	21.0%	–	Epoch AI
59	GLM 5.3 Flash	max	21.0%	–	Epoch AI
60	Opus 4.6	max	21.0%	–	Epoch AI
61	Gemini 3.5 Flash-Lite	low	21.0%	–	Epoch AI
62	Inkling	xhigh	21.0%	–	Epoch AI
63	GLM 5.1	max	20.0%	–	Epoch AI
64	Kimi K2.6	max	20.0%	–	Epoch AI
65	DeepSeek V4 Pro	max	19.0%	–	Epoch AI
66	Grok 4.3	high	18.0%	–	Epoch AI
67	o3 mini	high	15.0%	–	Epoch AI
68	Kimi K2.7 Code	max	14.0%	–	Epoch AI
69	Opus 4.5	high	14.0%	–	Epoch AI
70	Qwen 3.5 Flash	max	14.0%	–	Epoch AI
71	Qwen 3.6 Plus	max	14.0%	–	Epoch AI
72	MiniMax M3	max	13.0%	–	Epoch AI
73	Qwen 3.6 Flash	max	12.0%	–	Epoch AI
74	o1	high	10.0%	–	Epoch AI
75	Sonnet 4.5	high	10.0%	–	Epoch AI
76	Haiku 4.5	xhigh	8.0%	–	Epoch AI
77	Qwen 3.5 Plus	none	8.0%	–	Epoch AI
78	GPT-4o	high	6.0%	–	Epoch AI
79	GPT-4o mini	high	3.0%	–	Epoch AI
80	GPT-4.1	high	3.0%	–	Epoch AI
81	Opus 3	none	3.0%	–	Epoch AI
82	GPT-4.1 Mini	high	1.0%	–	Epoch AI
83	GPT-4.1 Nano	high	0.0%	–	Epoch AI