Stealth: Hunter Alpha

openrouter/hunter-alpha

Stealth: Hunter Alpha

via OpenRouter

Release Date

Mar 11th, 2026

Context Size

Reasoning

Benchmark Cost

$0.0000

Speed

52.6 tok/s

Subcategories

Bad Writing Habits

Detects common prose quality anti-patterns in AI-generated creative writing, including passive voice, past progressive overuse, weak dialogue tags, filter words, purple prose, cliches, AI-ism words/adverbs/names, and more.

Scenario	#1	#2	#3	#4	#5	Total
Detailed Writing Rules
Fantasy: entering an ancient ruin Creative Writing Hallucination	82	74	71	71	70	74%
Horror: alone in an eerie place at night Creative Writing Hallucination	86	85	80	76	75	81%
Literary fiction: old friends reunite Creative Writing Hallucination	81	79	77	76	75	78%
Mystery: examining a crime scene Creative Writing Hallucination	90	89	88	87	79	86%
Romance: separated couple reunites Creative Writing Hallucination	86	86	85	84	81	84%
Thriller: chase through city streets Creative Writing Hallucination	88	84	82	79	70	81%
Detailed Writing Rules						80.60%
genre
Fantasy: entering an ancient ruin Creative Writing Hallucination	78	73	72	72	72	73%
Horror: alone in an eerie place at night Creative Writing Hallucination	83	79	75	75	69	76%
Literary fiction: old friends reunite Creative Writing Hallucination	78	77	73	73	68	74%
Mystery: examining a crime scene Creative Writing Hallucination	80	77	76	69	68	74%
Romance: separated couple reunites Creative Writing Hallucination	86	77	76	74	73	77%
Thriller: chase through city streets Creative Writing Hallucination	84	80	79	74	71	77%
genre						75.36%
Novelcrafter Default Prompt
Fantasy: entering an ancient ruin Creative Writing Hallucination	76	74	73	69	67	72%
Horror: alone in an eerie place at night Creative Writing Hallucination	83	82	81	80	73	80%
Literary fiction: old friends reunite Creative Writing Hallucination	87	82	81	79	74	81%
Mystery: examining a crime scene Creative Writing Hallucination	87	84	83	82	82	84%
Romance: separated couple reunites Creative Writing Hallucination	83	81	80	76	76	79%
Thriller: chase through city streets Creative Writing Hallucination	92	84	84	84	75	84%
Novelcrafter Default Prompt						79.81%
78.59%

Codex Extraction

Evaluates a model's ability to extract structured codex entries (characters, locations, objects, lore) from prose passages and return them as well-formed XML.

Scenario	#1	#2	#3	#4	#5	Total
Long: The Spire of Echoes (Dense) Tooling Reasoning	99	99	96	96	94	97%
Medium: The Hollow (Inferred) Tooling Reasoning	96	96	95	94	94	95%
Medium: Through the Thornveil (Scattered) Tooling Reasoning	96	95	95	94	94	95%
Short: The Rusty Lantern (Explicit) Tooling Reasoning	96	96	95	95	94	95%
95.50%

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.

Scenario	#1	#2	#3	#4	#5	#6	#7	#8	#9	#10	Total
basic entries
Long text (~1594 words), big codex (51 entries) Hallucination	100	100	100	100	100	25	25	17	17	17	60%
Long text (~1594 words), small codex (11 entries) Hallucination	100	100	100	100	100	100	100	100	100	28	93%
Short text (~524 words), big codex (51 entries) Hallucination	100	100	100	25	25	25	25	25	25	17	47%
Short text (~524 words), small codex (11 entries) Hallucination	100	100	25	25	25	25	25	25	25	25	40%
basic entries											59.88%
detailed entries
Long text (~1594 words), big codex (51 detailed entries) Hallucination	100	100	100	100	100	100	100	100	100	100	100%
Long text (~1594 words), small codex (11 detailed entries) Hallucination	100	100	100	100	100	100	25	25	25	25	70%
Short text (~524 words), big codex (51 detailed entries) Hallucination	100	100	100	100	100	100	100	25	25	17	77%
Short text (~524 words), small codex (11 detailed entries) Hallucination	100	100	100	100	100	100	100	100	100	25	93%
detailed entries											84.79%
72.33%

Codex Violation Detection

Detects factual inconsistencies between a story bible and prose passages. The model must output structured XML identifying each violation with paragraph number and substring.

Scenario	#1	#2	#3	#4	#5	#6	#7	#8	#9	#10	Total
matrix
Large codex (40 entries), long passage (1,019 words) Tooling Reasoning	96	94	93	93	92	91	91	90	86	85	91%
Large codex (40 entries), short passage (165 words) Tooling Reasoning	100	98	98	96	96	95	94	94	92	86	95%
Small codex (7 entries), long passage (734 words) Tooling Reasoning	100	100	100	100	97	92	92	92	91	88	95%
Small codex (7 entries), short passage (165 words) Tooling Reasoning	100	100	100	100	100	100	100	100	100	100	100%
matrix											95.26%
tiers
5 codex entries Tooling Reasoning	100	100	100	100	100	100	91	91	91	91	96%
10 codex entries Tooling Reasoning	100	100	100	100	94	86	86	86	86	86	92%
20 codex entries Tooling Reasoning	100	97	97	94	92	92	92	91	89	88	93%
40 codex entries Tooling Reasoning	100	100	100	100	100	97	93	92	92	92	97%
tiers											94.68%
94.97%

Data extraction

Extract key details from a given block of text.

Scenario	#1	#2	#3	#4	#5	#6	#7	#8	#9	#10	Total
All valid emails Utility	100	100	100	100	100	100	100	100	100	100	100%
Contextual pronoun Utility	100	100	100	100	100	100	100	100	100	100	100%
Fruits excluding citrus Utility	100	100	100	100	100	100	100	100	100	100	100%
Future event time Reasoning	100	50	50	50	50	50	50	50	50	50	55%
Guess the pet Reasoning	100	100	100	100	100	100	100	100	100	50	95%
Highest-rated movie Reasoning	100	100	100	100	100	100	100	100	100	100	100%
Indirect birth year Reasoning	100	100	100	100	100	100	100	100	100	100	100%
What instrument does Lucy play? Reasoning	100	100	100	100	100	100	100	100	100	100	100%
What's the color of the car? Utility	100	100	100	100	100	100	100	100	100	100	100%
What's the correct time? Reasoning	100	0	0	0	0	0	0	0	0	0	10%
Who's the sister? Reasoning	100	100	100	100	100	100	100	100	100	100	100%
Who's the tallest? Reasoning	100	100	100	100	100	100	100	100	100	100	100%
88.33%

Dialogue tags

Various tasks related to dialogue tags in text.

Scenario	#1	#2	#3	#4	#5	#6	#7	#8	#9	#10	Total
dialogue-200
Write 200 words with 10% dialogue Rule Following Utility	85	50	44	41	34	26	22	22	0	0	32%
Write 200 words with 50% dialogue Rule Following Utility	53	50	50	50	49	49	47	38	34	0	42%
Write 200 words with 90% dialogue Rule Following Utility	98	92	80	50	50	49	48	38	20	7	53%
dialogue-200											42.53%
dialogue-500
Write 500 words with 30% dialogue Rule Following Utility	22	0	0	0	0	0	0	0	0	0	2%
Write 500 words with 50% dialogue Rule Following Utility	50	30	14	10	5	0	0	0	0	0	11%
Write 500 words with 70% dialogue Rule Following Utility	43	40	19	5	0	0	0	0	0	0	11%
dialogue-500											7.98%
Ungrouped
Write unattributed dialogue Rule Following	100	100	100	100	100	100	100	100	100	100	100%
35.93%

Language Comprehension

Does the model understand more than just English?

Scenario	#1	#2	#3	#4	#5	Total
Asking for directions (Dutch) Language	100	100	100	100	0	80%
Asking for directions (German) Language	100	100	100	100	100	100%
Friend got new kittens (German) Language	100	100	100	100	100	100%
Friend got new kittens (Tagalog) Language	100	100	100	100	100	100%
95.00%

Language Writing

Can the model generate text in different languages?

Scenario	#1	#2	#3	#4	#5	Total
Character dialogue (French) in a story Language	100	100	100	100	100	100%
Character dialogue (German) in a story Language	100	100	87	67	53	81%
Character dialogue (Hindi) in a story Language	100	100	93	67	45	81%
Character dialogue (Italian) in a story Language	100	100	100	100	95	99%
Character dialogue (Spanish) in a story Language	100	100	96	95	94	97%
91.70%

N-Length Sentences

Write sentences with exactly N words

Scenario	#1	#2	#3	#4	#5	#6	#7	#8	#9	#10	Total
Write sentences with 5 words each Utility	100	100	100	98	94	91	80	77	73	67	88%
Write sentences with 10 words each Utility	100	100	99	93	92	90	90	90	49	32	83%
Write sentences with 20 words each Utility	83	72	66	56	25	0	0	0	0	0	30%
67.22%

Novel outline

Handle questions about the outline of a novel in various formats

Scenario	#1	#2	#3	#4	#5	#6	#7	#8	#9	#10	Total
outline-count
Count acts Utility	100	100	100	100	100	100	100	100	100	100	100%
Count chapters Utility	100	100	100	100	100	100	100	100	100	100	100%
Count scenes Utility	100	100	100	100	100	100	100	100	0	0	80%
outline-count											93.33%
pov-count
Count point of views for Jack and Olivia Utility	100	100	100	100	100	100	50	50	50	50	80%
Count point of views for Jack Harper Utility	100	100	100	100	100	100	100	0	0	0	70%
Count point of views for Olivia Utility	100	100	100	100	100	100	100	100	0	0	80%
pov-count											76.67%
85.00%

Text Replacement

Tests deterministic text transformations: renaming characters/locations, expanding contractions, tense rewriting, POV shifts, gender swaps, combined transformations, and word avoidance. Scored by checking each expected change independently.

Scenario	#1	#2	#3	#4	#5	#6	#7	Total
Generic Prompt
Avoid said/asked/replied/answered Text Editing	100	100	100	100	100	100	100	100%
Character rename: Elena->Mirabel, Gregor->Aldric Text Editing	100	100	100	100	100	100	100	100%
Combined: 3rd person past → 1st person present Text Editing	99	99	99	99	99	99	99	99%
Expand all contractions Text Editing	100	100	100	100	100	100	97	100%
Location rename: market square, outer ring, bridge, northern mines Text Editing	100	100	100	100	100	100	100	100%
Multi-character gender swap: Priya(F)->Rohan(M), Mara unchanged Text Editing	100	100	100	100	100	100	100	100%
Passive voice → active voice Text Editing Hallucination	97	96	93	93	92	92	49	87%
POV shift: 3rd person to 1st person (Elena's perspective) Text Editing	100	100	100	100	100	100	100	100%
Tense rewriting: past to present Text Editing	100	100	99	99	96	92	89	97%
Generic Prompt								98.05%
Specific Prompt
Avoid said/asked/replied/answered Text Editing	100	100	100	100	100	100	67	95%
Character rename: Elena->Mirabel, Gregor->Aldric Text Editing	100	100	100	100	100	100	100	100%
Combined: 3rd person past → 1st person present Text Editing	100	99	99	99	99	99	99	99%
Expand all contractions Text Editing	100	100	100	100	100	99	99	100%
Location rename: market square, outer ring, bridge, northern mines Text Editing	100	100	100	100	100	100	100	100%
Multi-character gender swap: Priya(F)->Rohan(M), Mara unchanged Text Editing	100	100	100	100	100	100	95	99%
Passive voice → active voice Text Editing Hallucination	97	96	96	96	95	95	93	95%
POV shift: 3rd person to 1st person (Elena's perspective) Text Editing	100	100	100	100	100	100	100	100%
Tense rewriting: past to present Text Editing	100	100	100	100	100	100	100	100%
Specific Prompt								98.80%
98.43%

Tool usage within Novelcrafter

Output messages that are related to tool usage within Novelcrafter

Scenario	#1	#2	#3	#4	#5	#6	#7	#8	#9	#10	Total
Create alternate prose sections Tooling	100	100	100	100	100	100	100	100	100	100	100%
100.00%

Voice/dialogue sheets

Extract dialogue from given text as voice sheets.

Scenario	#1	#2	#3	#4	#5	#6	#7	#8	#9	#10	Total
Multiple speakers Rule Following	100	100	100	100	100	100	0	0	0	0	60%
Simple Rule Following	100	100	100	100	100	100	100	100	100	0	90%
Simple (1-shot) 1-shot Rule Following	100	100	100	100	0	0	0	0	0	0	40%
Simple (5-shot) Few-shot Rule Following	100	100	100	100	100	100	100	0	0	0	70%
Unattributed dialogue Rule Following	100	100	100	100	100	100	100	100	100	0	90%
70.00%

Write N of X

Write exactly N words/sentences/paragraphs...

Scenario	#1	#2	#3	#4	#5	#6	#7	#8	#9	#10	Total
paragraphs
1 paragraph summary Utility	100	100	100	100	100	100	100	100	100	100	100%
3 paragraph summary Utility	100	100	100	100	100	100	100	100	100	100	100%
5 paragraph summary Utility	100	100	100	100	100	100	100	100	100	0	90%
paragraphs											96.67%
sentences
1 sentence summary Utility	100	100	100	100	100	100	100	100	100	100	100%
3 sentence summary Utility	100	100	100	100	100	100	100	100	100	100	100%
10 sentence summary Utility	100	100	100	100	100	100	100	100	100	100	100%
20 sentence summary Utility	100	100	100	100	100	100	100	100	100	2	90%
50 sentence summary Utility	100	92	77	77	77	54	9	9	0	0	50%
sentences											87.94%
words
10 word summary Utility	100	100	100	100	100	100	100	100	98	98	100%
20 word summary Utility	100	100	100	100	100	98	98	98	92	92	98%
50 word summary Utility	100	100	100	100	100	100	100	92	77	77	95%
100 word summary Utility	100	100	77	77	54	54	54	54	0	0	57%
200 word summary Utility	0	0	0	0	0	0	0	0	0	0	0%
words											69.82%
82.98%