Long text (~1594 words), big codex (51 detailed entries)

Codex Red Herring (False Positive Detection)

Tests whether models correctly report "no violations" when a codex is fully consistent with the prose passage. Models that hallucinate false violations (false positives) fail. Uses a 2×2 matrix of text length × codex size, with bare and detailed-entry variants.

Hallucination

Performance Score Distribution (Top 20)

Click a model name to view its detail page.

	Score
Claude Opus 4.6 (Reasoning)	100%
GPT-5 Mini	100%
GPT-5.1	100%
Claude Opus 4.6	100%
GPT-5	100%
Z.AI GLM 5	100%
o4 Mini High	100%
Grok 4.1 Fast	100%
Aion 2.0	100%
GPT-4.1	100%
o4 Mini	100%
Ministral 3 8B	100%
Ministral 8B	100%
Ministral 3 14B	93%
Claude Sonnet 4.6 (Reasoning)	93%
GPT-5.2	93%
Grok 4 Fast	93%
Gemini 2.5 Flash Lite (Reasoning)	93%
GPT-5 Nano	93%
MoonshotAI: Kimi K2.5	92%

	Score	Cost	Time
Ministral 8B	100%	$0.0014	525ms
Ministral 3 8B	100%	$0.0022	678ms
Ministral 3 14B	93%	$0.0029	2.7s
Arcee AI: Trinity Mini	90%	$0.0018	45.5s
GPT-4.1	100%	$0.0097	972ms
Grok 4.1 Fast	100%	$0.0031	13.4s
ByteDance Seed 1.6 Flash	84%	$0.0016	13.8s
Grok 4 Fast	93%	$0.0032	25.0s
Gemini 2.5 Flash Lite (Reasoning)	93%	$0.0038	27.3s
Gemini 2.5 Flash (Reasoning)	85%	$0.015	19.0s
GPT-5.2	93%	$0.021	20.9s
GPT-5 Mini	100%	$0.0090	53.0s
ByteDance Seed 1.6	85%	$0.0074	45.3s
Minimax M2.5	83%	$0.0064	50.3s
GPT-5 Nano	93%	$0.0046	1.3m
o4 Mini	100%	$0.026	43.6s
Z.AI GLM 4.5	70%	$0.0061	34.6s
Gemini 3 Flash (Preview, Reasoning)	91%	$0.031	52.9s
Aion 2.0	100%	$0.017	1.7m
GPT-5.1	100%	$0.051	44.5s

	Score	Cost	Speed	Stability
Ministral 8B	100%	$0.0014	525ms	100%
Ministral 3 8B	100%	$0.0022	678ms	100%
GPT-4.1	100%	$0.0097	972ms	100%
Grok 4.1 Fast	100%	$0.0031	13.4s	100%
GPT-5 Mini	100%	$0.0090	53.0s	100%
o4 Mini	100%	$0.026	43.6s	100%
GPT-5.1	100%	$0.051	44.5s	100%
Aion 2.0	100%	$0.017	1.7m	100%
Claude Opus 4.6	100%	$0.104	19.4s	100%
o4 Mini High	100%	$0.048	1.5m	100%
Z.AI GLM 5	100%	$0.031	2.4m	100%
GPT-5	100%	$0.066	2.0m	100%
Ministral 3 14B	93%	$0.0029	2.7s	56%
Grok 4 Fast	93%	$0.0032	25.0s	55%
Gemini 2.5 Flash Lite (Reasoning)	93%	$0.0038	27.3s	55%
GPT-5.2	93%	$0.021	20.9s	55%
GPT-5 Nano	93%	$0.0046	1.3m	55%
Arcee AI: Trinity Mini	90%	$0.0018	45.5s	40%
Gemini 3 Flash (Preview, Reasoning)	91%	$0.031	52.9s	46%
ByteDance Seed 1.6 Flash	84%	$0.0016	13.8s	37%

Rank	Model	Avg. Cost	Avg. Time	Stability	# 1	# 2	# 3	# 4	# 5	# 6	# 7	# 8	# 9	# 10	Total
27	Claude Opus 4.6 (Reasoning)	$0.322	2.7m	100%	100	100	100	100	100	100	100	100	100	100	100%
5	GPT-5 Mini	$0.0090	53.0s	100%	100	100	100	100	100	100	100	100	100	100	100%
7	GPT-5.1	$0.051	44.5s	100%	100	100	100	100	100	100	100	100	100	100	100%
9	Claude Opus 4.6	$0.104	19.4s	100%	100	100	100	100	100	100	100	100	100	100	100%
12	GPT-5	$0.066	2.0m	100%	100	100	100	100	100	100	100	100	100	100	100%
11	Z.AI GLM 5	$0.031	2.4m	100%	100	100	100	100	100	100	100	100	100	100	100%
10	o4 Mini High	$0.048	1.5m	100%	100	100	100	100	100	100	100	100	100	100	100%
4	Grok 4.1 Fast	$0.0031	13.4s	100%	100	100	100	100	100	100	100	100	100	100	100%
8	Aion 2.0	$0.017	1.7m	100%	100	100	100	100	100	100	100	100	100	100	100%
3	GPT-4.1	$0.0097	972ms	100%	100	100	100	100	100	100	100	100	100	100	100%
6	o4 Mini	$0.026	43.6s	100%	100	100	100	100	100	100	100	100	100	100	100%
2	Ministral 3 8B	$0.0022	678ms	100%	100	100	100	100	100	100	100	100	100	100	100%
1	Ministral 8B	$0.0014	525ms	100%	100	100	100	100	100	100	100	100	100	100	100%
13	Ministral 3 14B	$0.0029	2.7s	56%	100	100	100	100	100	100	100	100	100	28	93%
83	Claude Sonnet 4.6 (Reasoning)	$0.404	6.7m	55%	100	100	100	100	100	100	100	100	100	25	93%
16	GPT-5.2	$0.021	20.9s	55%	100	100	100	100	100	100	100	100	100	25	93%
14	Grok 4 Fast	$0.0032	25.0s	55%	100	100	100	100	100	100	100	100	100	25	93%
15	Gemini 2.5 Flash Lite (Reasoning)	$0.0038	27.3s	55%	100	100	100	100	100	100	100	100	100	25	93%
17	GPT-5 Nano	$0.0046	1.3m	55%	100	100	100	100	100	100	100	100	100	25	93%
24	MoonshotAI: Kimi K2.5	$0.024	3.2m	50%	100	100	100	100	100	100	100	100	100	17	92%
19	Gemini 3 Flash (Preview, Reasoning)	$0.031	52.9s	46%	100	100	100	100	100	100	100	100	100	10	91%
18	Arcee AI: Trinity Mini	$0.0018	45.5s	40%	100	100	100	100	100	100	100	100	100	0	90%
22	ByteDance Seed 1.6	$0.0074	45.3s	40%	100	100	100	100	100	100	100	100	25	25	85%
21	Gemini 2.5 Flash (Reasoning)	$0.015	19.0s	40%	100	100	100	100	100	100	100	100	25	25	85%
20	ByteDance Seed 1.6 Flash	$0.0016	13.8s	37%	100	100	100	100	100	100	100	100	25	17	84%
23	Minimax M2.5	$0.0064	50.3s	30%	100	100	100	100	100	100	100	100	25	2	83%
31	Grok 4	$0.099	1.7m	24%	100	100	100	100	100	100	100	25	17	10	75%
26	Z.AI GLM 4.5	$0.0061	34.6s	27%	100	100	100	100	100	100	31	29	25	17	70%
37	Z.AI GLM 4.7	$0.037	3.0m	23%	100	100	100	100	100	100	25	25	25	13	69%
80	Gemini 3.1 Pro (Preview)	$0.259	3.3m	17%	100	100	100	100	100	100	17	17	17	13	66%
28	Qwen 2.5 72B	$0.0018	5.5s	17%	100	100	100	100	100	38	33	27	25	6	63%
30	Z.AI GLM 4.6	$0.013	1.3m	15%	100	100	100	100	100	25	25	25	25	17	62%
36	Claude Sonnet 4.6	$0.096	57.8s	26%	100	100	50	50	50	50	50	35	32	31	55%
35	Cohere Command R+ (Aug. 2024)	$0.040	12.8s	5%	100	100	100	100	100	17	13	13	3	1	55%
84	Qwen 3.5 397B A17B	$0.041	7.4m	6%	100	100	100	100	25	25	25	25	17	13	53%
78	Gemini 3 Pro (Preview)	$0.197	2.2m	5%	100	100	100	100	25	25	25	17	13	13	52%
25	Claude Haiku 4.5	$0.018	5.5s	48%	50	50	50	50	50	50	50	50	50	42	49%
32	GPT-4.1 Nano	$0.0010	8.3s	4%	100	100	100	100	26	26	25	3	2	1	48%
33	Claude Sonnet 4.5	$0.051	5.8s	16%	100	100	42	42	38	38	38	33	17	17	46%
65	Arcee AI: Trinity Large (Preview)	$0.0000	3.8m	7%	100	100	100	26	26	26	26	26	26	0	46%
38	GPT-4o, Aug. 6th (temp=1)	$0.019	2.0s	9%	100	100	35	35	25	25	17	17	17	8	38%
43	Gemini 2.5 Flash Lite	$0.0038	18.0s	2%	100	100	100	26	25	3	2	2	0	0	36%
29	Mistral Medium 3.1	$0.0070	6.2s	29%	42	38	33	33	31	31	30	29	29	27	32%
53	Mistral Small 3.2 24B	$0.0038	1.0m	0%	100	100	100	2	2	2	1	1	1	0	31%
52	WizardLM 2 8x22b	$0.0094	58.3s	4%	100	100	38	26	17	10	7	4	3	3	31%
75	Z.AI GLM 4.7 Flash	$0.0066	3.3m	11%	100	25	25	25	25	17	17	17	17	13	28%
34	GPT-4.1 Mini	$0.0039	19.8s	27%	30	28	28	28	27	27	27	27	27	25	27%
45	GPT-4o, May 13th (temp=1)	$0.074	2.9s	20%	50	42	38	33	31	25	17	10	8	7	26%
39	Mistral Small Creative	$0.0025	19.9s	20%	50	26	26	26	26	26	26	26	25	1	26%
40	Rocinante 12B	$0.0032	17.1s	18%	50	50	32	31	31	25	6	6	5	4	24%
81	Claude Opus 4	$0.254	10.0s	9%	50	42	38	35	13	13	13	10	10	7	23%
55	Claude Opus 4.5	$0.087	8.3s	17%	35	33	33	25	25	17	17	17	10	8	22%
41	Writer: Palmyra X5	$0.015	17.0s	21%	42	28	27	27	26	26	17	13	6	5	22%
46	GPT-4o, Aug. 6th (temp=0)	$0.027	3.9s	13%	42	42	42	35	31	7	6	5	3	2	21%
58	Claude 3.7 Sonnet	$0.052	6.8s	5%	100	35	13	10	10	10	10	8	7	7	21%
42	Gemini 2.5 Flash	$0.0036	1.1s	15%	25	25	25	25	17	17	17	17	17	17	20%
44	Llama 3.1 8B	$0.0005	38.9s	20%	33	33	33	29	27	27	6	6	2	0	20%
48	Ministral 3B	$0.0012	1.1m	20%	27	27	27	26	26	26	26	2	1	0	19%
56	Hermes 3 70B	$0.0044	24.6s	3%	100	30	10	8	8	7	6	5	5	4	18%
69	DeepSeek V3.2	$0.0049	2.1m	12%	50	27	26	25	25	10	7	3	1	0	17%
47	Claude 3 Haiku	$0.0043	4.6s	9%	42	38	33	13	13	13	6	6	6	6	17%
54	DeepSeek-V2 Chat	$0.0056	21.8s	6%	50	30	25	25	10	7	7	6	4	1	16%
50	GPT-4o Mini (temp=1)	$0.0017	8.0s	8%	35	32	31	10	10	10	8	8	8	4	16%
61	Ministral 3 3B	$0.0042	1.8m	19%	27	26	26	25	25	25	1	0	0	0	16%
49	Gemini 3 Flash (Preview)	$0.0086	4.7s	10%	35	31	13	13	13	13	13	10	10	5	15%
57	Claude Sonnet 4	$0.051	6.4s	10%	42	13	13	13	13	13	13	13	13	10	15%
64	Gemini 2.5 Pro	$0.064	40.8s	13%	25	17	17	17	17	13	13	13	10	10	15%
51	Hermes 3 405B	$0.014	7.7s	10%	38	17	17	17	13	13	10	10	7	6	15%
74	DeepSeek V3.1	$0.0048	2.2m	11%	27	26	26	25	25	4	3	2	2	1	14%
63	Llama 3.1 Nemotron 70B	$0.018	29.9s	4%	33	31	28	6	6	6	6	6	4	3	13%
70	Mistral Large	$0.037	28.1s	4%	27	27	27	6	5	5	5	4	4	2	11%
59	Llama 3.1 70B	$0.0076	18.2s	6%	28	17	10	10	8	6	5	5	5	3	10%
60	DeepSeek V3 (2024-12-26)	$0.0058	16.0s	5%	25	17	10	7	6	6	5	5	4	3	9%
76	Claude 3.5 Sonnet	$0.105	9.6s	8%	10	8	8	8	8	8	7	7	7	7	8%
79	Qwen 3.5 Plus (2026-02-15)	$0.025	2.2m	7%	13	13	10	10	8	7	5	3	2	1	7%
66	Mistral Large 3	$0.0091	28.3s	4%	27	8	6	6	5	4	4	3	3	2	7%
72	Mistral Large 2	$0.036	26.7s	3%	27	8	6	5	4	4	4	4	3	2	7%
67	GPT-4o Mini (temp=0)	$0.0016	45.6s	6%	8	8	7	7	7	6	6	5	4	4	6%
62	Gemma 3 12B	$0.0011	16.5s	5%	8	8	8	6	6	5	4	4	4	1	5%
71	DeepSeek V3 (2025-03-24)	$0.0038	54.7s	5%	8	8	6	5	5	5	5	5	1	1	5%
68	Gemma 3 27B	$0.0018	21.0s	3%	7	4	4	3	3	3	3	3	2	2	3%
82	Mistral NeMO	$0.0054	3.1m	2%	10	7	5	4	3	1	1	1	0	0	3%
77	GPT-4o, May 13th (temp=0)	$0.094	10.4s	3%	5	5	4	3	3	3	3	3	3	2	3%
73	Gemma 3 4B	$0.0008	30.9s	1%	2	1	1	1	1	1	1	1	1	1	1%
47.76%

Median	Evaluator	Top 3	Flop 3
40.0%	Correct "no violations" response	100o4 Mini High 100o4 Mini 100GPT-5	0DeepSeek V3 (2025-03-24) 0Mistral NeMO 0DeepSeek V3 (2024-12-26)
36.6%	No hallucinated violations	100Ministral 8B 100Claude Opus 4.6 (Reasoning) 100GPT-5.1	1Ministral 3 3B 2Gemma 3 4B 2Ministral 3B

Codex Red Herring (False Positive Detection)

Long text (~1594 words), big codex (51 detailed entries)

Performance Score Distribution (Top 20)

Price-Performance Score Distribution (Top 20)

Most Stable Models (Top 20)

Top Overall Models (Top 20)