Stealth: Aurora Alpha

openrouter/aurora-alpha

Stealth: Aurora Alpha

via OpenRouter

Release Date

Feb 9th, 2026

Context Size

128k

Reasoning

Benchmark Cost

$0.0000

Speed

324.5 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	66	66	65	62	62	64%
Horror: alone in an eerie place at night Creative Writing Hallucination	69	64	62	62	62	64%
Literary fiction: old friends reunite Creative Writing Hallucination	75	74	74	72	71	73%
Mystery: examining a crime scene Creative Writing Hallucination	77	72	69	65	62	69%
Romance: separated couple reunites Creative Writing Hallucination	76	74	72	68	67	71%
Thriller: chase through city streets Creative Writing Hallucination	72	72	71	68	65	70%
Detailed Writing Rules						68.42%
genre
Fantasy: entering an ancient ruin Creative Writing Hallucination	63	61	61	61	60	61%
Horror: alone in an eerie place at night Creative Writing Hallucination	62	59	59	58	58	59%
Literary fiction: old friends reunite Creative Writing Hallucination	70	67	67	66	66	67%
Mystery: examining a crime scene Creative Writing Hallucination	68	68	67	67	63	66%
Romance: separated couple reunites Creative Writing Hallucination	72	69	67	64	63	67%
Thriller: chase through city streets Creative Writing Hallucination	67	64	62	62	60	63%
genre						64.01%
Novelcrafter Default Prompt
Fantasy: entering an ancient ruin Creative Writing Hallucination	68	65	65	63	62	64%
Horror: alone in an eerie place at night Creative Writing Hallucination	67	64	63	62	59	63%
Literary fiction: old friends reunite Creative Writing Hallucination	76	76	75	71	62	72%
Mystery: examining a crime scene Creative Writing Hallucination	74	73	73	72	66	72%
Romance: separated couple reunites Creative Writing Hallucination	78	73	72	72	70	73%
Thriller: chase through city streets Creative Writing Hallucination	70	70	66	64	62	66%
Novelcrafter Default Prompt						68.30%
66.91%

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	89	88	87	87	83	83	83	82	82	77	84%
Large codex (40 entries), short passage (165 words) Tooling Reasoning	96	96	95	90	90	90	90	90	90	83	91%
Small codex (7 entries), long passage (734 words) Tooling Reasoning	92	88	88	88	88	88	88	87	70	70	85%
Small codex (7 entries), short passage (165 words) Tooling Reasoning	97	97	97	97	97	97	97	97	97	0	87%
matrix											86.68%
tiers
5 codex entries Tooling Reasoning	100	100	100	100	100	93	93	93	93	66	94%
10 codex entries Tooling Reasoning	100	100	100	100	100	100	100	100	100	100	100%
20 codex entries Tooling Reasoning	91	86	86	85	85	85	85	85	85	81	85%
40 codex entries Tooling Reasoning	97	97	97	97	97	93	92	88	88	75	92%
tiers											92.77%
89.73%

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	100	100	100	100	100	100	100	100	100	100%
Guess the pet Reasoning	100	100	100	100	100	100	100	100	100	100	100%
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	0	0	0	0	0	0	0	0	0	0	0%
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%
91.67%

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	100	100	100	100	100	100	100	76	68	50	89%
Write 200 words with 50% dialogue Rule Following Utility	100	100	100	100	99	99	98	50	50	50	85%
Write 200 words with 90% dialogue Rule Following Utility	95	94	77	72	62	59	56	50	0	0	56%
dialogue-200											76.87%
dialogue-500
Write 500 words with 30% dialogue Rule Following Utility	94	92	80	77	53	50	39	25	0	0	51%
Write 500 words with 50% dialogue Rule Following Utility	81	75	61	48	42	37	22	21	10	0	40%
Write 500 words with 70% dialogue Rule Following Utility	84	71	50	48	24	6	1	0	0	0	28%
dialogue-500											39.74%
Ungrouped
Write unattributed dialogue Rule Following	100	100	100	61	61	61	14	1	0	0	50%
57.07%

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	0	0	60%
Friend got new kittens (German) Language	100	100	100	100	100	100%
Friend got new kittens (Tagalog) Language	100	100	100	100	100	100%
85.00%

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	100	100	100	100%
Character dialogue (Hindi) in a story Language	100	100	100	100	100	100%
Character dialogue (Italian) in a story Language	100	100	100	100	100	100%
Character dialogue (Spanish) in a story Language	100	100	100	100	100	100%
100.00%

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	100	100	100	100	100	91	89	98%
Write sentences with 10 words each Utility	100	100	100	100	100	100	100	100	100	100	100%
Write sentences with 20 words each Utility	100	100	100	100	100	100	100	100	100	75	98%
98.48%

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	0	0	0	70%
outline-count											90.00%
pov-count
Count point of views for Jack and Olivia Utility	100	100	50	50	50	50	50	50	50	50	60%
Count point of views for Jack Harper Utility	100	100	100	100	100	100	100	100	100	100	100%
Count point of views for Olivia Utility	100	100	100	100	100	100	100	100	100	100	100%
pov-count											86.67%
88.33%

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	0	0	0	0	0	0	0	0	0	10%
Simple Rule Following	0	0	0	0	0	0	0	0	0	0	0%
Simple (1-shot) 1-shot Rule Following	100	100	100	0	0	0	0	0	0	0	30%
Simple (5-shot) Few-shot Rule Following	100	100	100	0	0	0	0	0	0	0	30%
Unattributed dialogue Rule Following	100	100	100	100	100	100	100	100	100	100	100%
34.00%

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	100	100%
paragraphs											100.00%
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	98	98	98	92	99%
20 sentence summary Utility	100	100	100	100	100	100	100	92	92	54	94%
50 sentence summary Utility	100	100	100	100	100	98	98	92	77	77	94%
sentences											97.37%
words
10 word summary Utility	100	100	100	100	100	100	100	100	100	100	100%
20 word summary Utility	100	100	100	100	100	100	100	100	100	100	100%
50 word summary Utility	100	100	100	100	100	100	100	100	100	100	100%
100 word summary Utility	100	100	100	100	100	100	100	100	100	100	100%
200 word summary Utility	100	100	100	100	100	100	100	100	100	77	98%
words											99.54%
98.81%