Stealth: Aurora Alpha

openrouter/aurora-alpha

Stealth: Aurora Alpha

via OpenRouter

Release Date

Feb 9th, 2026

Parameters

–

Context Size

128k

Benchmark Cost

$0.0000

Speed

351.4 tok/s

Creative writing

67.83%

Rule following

85.91%

Utility

81.49%

Mathematics

100.00%

Tooling

89.18%

Language

90.92%

Logic

88.61%

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	Run 1	Run 2	Run 3	Total
genre
Fantasy: entering an ancient ruin 0-shot Creative writingRule following	81%	75%	74%	77%
Horror: alone in an eerie place at night 0-shot Creative writingRule following	79%	76%	68%	74%
Literary fiction: old friends reunite 0-shot Creative writingRule following	89%	86%	83%	86%
Mystery: examining a crime scene 0-shot Creative writingRule following	85%	82%	80%	82%
Romance: separated couple reunites 0-shot Creative writingRule following	86%	80%	78%	81%
Thriller: chase through city streets 0-shot Creative writingRule following	81%	81%	80%	80%
80.18%

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	Run 1	Run 2	Run 3	Run 4	Run 5	Run 6	Run 7	Run 8	Run 9	Run 10	Total
matrix
Large codex (40 entries), long passage (1,019 words) 0-shot ToolingUtilityLogicRule following	88%	84%	83%	83%	82%	82%	81%	80%	78%	75%	82%
Large codex (40 entries), short passage (165 words) 0-shot ToolingUtilityLogicRule following	96%	96%	95%	90%	90%	90%	90%	90%	90%	83%	91%
Small codex (7 entries), long passage (734 words) 0-shot ToolingUtilityLogicRule following	95%	91%	91%	91%	91%	91%	91%	90%	70%	70%	87%
Small codex (7 entries), short passage (165 words) 0-shot ToolingUtilityLogicRule following	97%	97%	97%	97%	97%	97%	97%	97%	97%	0%	87%
tiers
5 codex entries 0-shot ToolingUtilityLogicRule following	100%	100%	100%	100%	100%	93%	93%	93%	93%	66%	94%
10 codex entries 0-shot ToolingUtilityLogicRule following	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
20 codex entries 0-shot ToolingUtilityLogicRule following	91%	86%	86%	85%	85%	85%	85%	85%	85%	81%	85%
40 codex entries 0-shot ToolingUtilityLogicRule following	97%	97%	97%	97%	97%	93%	92%	88%	88%	75%	92%
89.71%

Data extraction

Extract key details from a given block of text.

Scenario	Run 1	Run 2	Run 3	Run 4	Run 5	Run 6	Run 7	Run 8	Run 9	Run 10	Total
All valid emails 0-shot Utility	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
Contextual pronoun 0-shot Utility	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
Fruits excluding citrus 0-shot Utility	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
Future event time 0-shot UtilityLogic	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
Guess the pet 0-shot UtilityLogic	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
Highest-rated movie 0-shot Utility	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
Indirect birth year 0-shot UtilityMathematicsLogic	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
What instrument does Lucy play? 0-shot UtilityLogic	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
What's the color of the car? 0-shot UtilityLogic	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
What's the correct time? 0-shot UtilityLogic	0%	0%	0%	0%	0%	0%	0%	0%	0%	0%	0%
Who's the sister? 0-shot UtilityLogic	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
Who's the tallest? 0-shot UtilityLogic	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
91.67%

Dialogue tags

Various tasks related to dialogue tags in text.

Scenario	Run 1	Run 2	Run 3	Run 4	Run 5	Run 6	Run 7	Run 8	Run 9	Run 10	Total
dialogue-200
Write 200 words with 10% dialogue 0-shot Creative writingRule following	100%	100%	100%	100%	100%	100%	100%	76%	68%	50%	89%
Write 200 words with 50% dialogue 0-shot Creative writingRule following	100%	100%	100%	100%	99%	99%	98%	50%	50%	50%	85%
Write 200 words with 90% dialogue 0-shot Creative writingRule following	95%	94%	77%	72%	62%	59%	56%	50%	0%	0%	56%
dialogue-500
Write 500 words with 30% dialogue 0-shot Creative writingRule following	94%	92%	80%	77%	53%	50%	39%	25%	0%	0%	51%
Write 500 words with 50% dialogue 0-shot Creative writingRule following	81%	75%	61%	48%	42%	37%	22%	21%	10%	0%	40%
Write 500 words with 70% dialogue 0-shot Creative writingRule following	84%	71%	50%	48%	24%	6%	1%	0%	0%	0%	28%
Ungrouped
Write unattributed dialogue 0-shot Creative writingRule following	100%	100%	100%	61%	61%	61%	14%	14%	0%	0%	51%
57.25%

Language Comprehension

Does the model understand more than just English?

Scenario	Run 1	Run 2	Run 3	Run 4	Run 5	Total
Asking for directions (Dutch) 0-shot Language	100%	100%	100%	100%	0%	80%
Asking for directions (German) 0-shot Language	100%	100%	100%	0%	0%	60%
Friend got new kittens (German) 0-shot Language	100%	100%	100%	100%	100%	100%
Friend got new kittens (Tagalog) 0-shot Language	100%	100%	100%	100%	100%	100%
85.00%

Language Writing

Can the model generate text in different languages?

Scenario	Run 1	Run 2	Run 3	Run 4	Run 5	Total
Character dialogue (French) in a story 0-shot Language	100%	100%	87%	86%	83%	91%
Character dialogue (German) in a story 0-shot Language	100%	100%	100%	91%	89%	96%
Character dialogue (Hindi) in a story 0-shot Language	100%	100%	100%	100%	100%	100%
Character dialogue (Italian) in a story 0-shot Language	100%	100%	92%	91%	89%	94%
Character dialogue (Spanish) in a story 0-shot Language	100%	100%	100%	93%	92%	97%
95.66%

N-Length Sentences

Write sentences with exactly N words

Scenario	Run 1	Run 2	Run 3	Run 4	Run 5	Run 6	Run 7	Run 8	Run 9	Run 10	Total
Write sentences with 5 words each 0-shot Rule following	100%	100%	100%	100%	100%	100%	100%	98%	91%	89%	98%
Write sentences with 10 words each 0-shot Rule following	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
Write sentences with 20 words each 0-shot Rule following	100%	100%	100%	100%	100%	100%	100%	100%	92%	75%	97%
98.16%

Novel outline

Handle questions about the outline of a novel in various formats

Scenario	Run 1	Run 2	Run 3	Run 4	Run 5	Run 6	Run 7	Run 8	Run 9	Run 10	Total
outline-count
Count acts 0-shot ToolingUtility	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
Count chapters 0-shot ToolingUtility	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
Count scenes 0-shot ToolingUtility	100%	100%	100%	100%	100%	100%	100%	0%	0%	0%	70%
pov-count
Count point of views for Jack and Olivia 0-shot ToolingUtility	100%	50%	50%	50%	50%	50%	50%	50%	50%	0%	50%
Count point of views for Jack Harper 0-shot ToolingUtility	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
Count point of views for Olivia 0-shot ToolingUtility	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
86.67%

Tool usage within Novelcrafter

Output messages that are related to tool usage within Novelcrafter

Scenario	Run 1	Run 2	Run 3	Run 4	Run 5	Run 6	Run 7	Run 8	Run 9	Run 10	Total
Create alternate prose sections 0-shot ToolingUtility	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	Run 1	Run 2	Run 3	Run 4	Run 5	Run 6	Run 7	Run 8	Run 9	Run 10	Total
Multiple speakers 0-shot Utility	100%	0%	0%	0%	0%	0%	0%	0%	0%	0%	10%
Simple 0-shot Utility	0%	0%	0%	0%	0%	0%	0%	0%	0%	0%	0%
Simple (1-shot) 1-shot Utility	100%	100%	100%	0%	0%	0%	0%	0%	0%	0%	30%
Simple (5-shot) Few-shot Utility	100%	100%	100%	0%	0%	0%	0%	0%	0%	0%	30%
Unattributed dialogue 0-shot Utility	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
34.00%

Write N of X

Write exactly N words/sentences/paragraphs...

Scenario	Run 1	Run 2	Run 3	Run 4	Run 5	Run 6	Run 7	Run 8	Run 9	Run 10	Total
paragraphs
1 paragraph summary 0-shot Rule following	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
3 paragraph summary 0-shot Rule following	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
5 paragraph summary 0-shot Rule following	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
sentences
1 sentence summary 0-shot Rule following	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
3 sentence summary 0-shot Rule following	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
10 sentence summary 0-shot Rule following	100%	100%	100%	100%	100%	100%	98%	98%	98%	92%	99%
20 sentence summary 0-shot Rule following	100%	100%	100%	100%	100%	100%	100%	92%	92%	54%	94%
50 sentence summary 0-shot Rule following	100%	100%	100%	100%	100%	98%	98%	92%	77%	77%	94%
words
10 word summary 0-shot Rule following	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
20 word summary 0-shot Rule following	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
50 word summary 0-shot Rule following	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
100 word summary 0-shot Rule following	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%	100%
200 word summary 0-shot Rule following	100%	100%	100%	100%	100%	100%	100%	100%	100%	77%	98%
98.81%