NC Bench
Overview
About
Tests
Models
Vendors
Run: 2026-02-17-01KHMR4Z8YDZ4BEK1AATM3BC03
Run Details
Model:
Claude Opus 4.5
Test:
Bad Writing Habits
Scenario:
Mystery: examining a crime scene
Duration:
53.9s
Cost:
$0.066110
Provider:
Amazon Bedrock
Model input
System
You are an expert novelist with a gift for vivid, immersive prose. You write in tight third-person limited point of view with a strong narrative voice. Your prose is clean, precise, and engaging — you favor strong verbs, concrete details, and natural-sounding dialogue. You will be given a story bible (codex) containing canonical details about characters, locations, items, and lore. Use these details to ground your writing in the established world. Stay consistent with the codex. Write only the prose of the scene. Do not include titles, chapter headings, markdown formatting, or any commentary before or after the scene.
User/Human
<codex> <character id="4416" name="Detective Harlow Quinn" aliases="Quinn, Detective Quinn, Harlow" pronouns="she/her" species="Human" storyRole="Antagonist"> <eyeColor>brown</eyeColor> <hair>closely cropped salt-and-pepper</hair> <height>5'9"</height> <age>41</age> <jawline>sharp jaw</jawline> <watch>worn leather watch on her left wrist</watch> <bearing>military precision</bearing> <description>A Metropolitan Police detective with 18 years of decorated service who suspects the clique is involved in criminal activity.</description> <backstory>She lost her partner, DS Morris, during a case three years ago under unexplained circumstances that had supernatural origins she doesn't yet understand.</backstory> </character> <character id="4414" name="Eva Kowalski" aliases="Eva, Evie" pronouns="she/her" species="Human" storyRole="Best Friend"> <eyeColor>green</eyeColor> <hair>curly red</hair> <height>5'4"</height> <age>26</age> <glasses>round glasses</glasses> <satchel>worn leather satchel full of books</satchel> <freckles>freckled complexion</freckles> <nervousHabit>tucking hair behind her left ear</nervousHabit> <description>Aurora's childhood friend and an occult researcher.</description> <backstory>Moved to London two years before Aurora and works as a research assistant at the British Museum's restricted archives. She holds a master's degree in Ancient History from Oxford.</backstory> </character> <location id="856" name="The Veil Market" aliases="Veil Market, the Market, underground market" realm="Earth"> <currentLocation>abandoned Tube station beneath Camden</currentLocation> <entryRequirement>bone token</entryRequirement> <schedule>moves locations every full moon</schedule> <description>A hidden supernatural black market that sells enchanted goods, banned alchemical substances, and information.</description> </location> <item id="2004" name="Veil Compass" aliases="the Compass, shadow compass" type="Tool" origin="The Veil Market"> <casingMaterial>small brass compass</casingMaterial> <faceMarkings>face etched with protective sigils</faceMarkings> <needle>points toward the nearest supernatural rift or portal</needle> <patina>casing has a patina of verdigris</patina> <creator>crafted by a Shade artisan</creator> <description>A compass attuned to supernatural energy.</description> </item> </codex> Write a fully fleshed out scene of at least 1000 words in the mystery genre. A detective arrives at a crime scene in an unusual location. Something is wrong — the evidence doesn't add up. A colleague is present, offering a different interpretation. Through careful observation and deduction, the detective begins to see what others have missed. Use the codex entries above as your world reference for characters and setting. Only include the prose of the scene without any markdown or commentary.
Model response
Messages
Meta
AI
The bone token felt wrong in Quinn's palm. Too light, like holding a promise someone never in
tended to
keep. She'd confiscated it from a pickpocket in Whitechapel three days ago—a nervous kid who'd sworn he didn't know what it was, just that it was worth something to the right people. The right people, apparently, meant whoever ran a black market beneath the abandoned tunnels of Camden. Quinn descended the maintenance ladder into darkness, her worn leather
watch
catching against the rusted rungs. The passage had
been hidden
behind a false wall in a closed chip shop, exactly where her informant said it would be. The air grew colder with each step, carrying the mineral tang of old stone and something else—something that made the hair on her arms stand up. She'd been a detective for eighteen years. She'd seen bodies in e
very
state of decomposition, crime scenes that would make veterans lose their lunch. But nothing had prepared her for what waited at the bottom of that ladder. The Veil Market spread out before her like a fever dream given form. Lanterns hung from the curved ceiling of the abandoned Tube station, casting pools of amber light across stalls draped in fabric that
seemed to
shift color when she
wasn't looking
directly at it. Vendors called out in languages she didn't recognize, offering wares displayed on tables made from salvaged platform benches and Victorian luggage carts. The crowd was sparse at this hour—figures in hooded cloaks, a woman with skin that glittered like crushed pearl, a man whose shadow moved a half-second behind his body. Quinn kept her hand near her service weapon and followed the yellow crime scene tape. It was incongruous, that tape. Bright and official amid all this impossible commerce. It str
etched
across a narrow alcove between two stalls, where someone had laid out the body with almost ceremonial precision. The victim was a young woman, mid-twenties, with curly red hair fanned around her head like a copper halo. Round glasses sat cracked across the bridge of her nose. A worn leather satchel lay open beside her, books spilled across the ancient tile floor. Quinn's throat tightened. She'd seen photographs of this woman before. Eva Kowalski. Research assistant at the British Museum, master's degree from Oxford. Friend to Aurora Vance, the primary person of interest in three open cases that had been driving Quinn
slowly
mad for months. "Detective Quinn." She turned. A uniformed constable stood at the edge of the tape—PC Brennan, if she remembered correctly. Young, fresh-faced, clearly in over his head. His eyes kept darting to the market stalls behind them, where a vendor
was selling
jars of what
appeared to
be bottled lightning. "Brennan. Who called this in?" "Anonymous tip, ma'am. Came through the regular channels, but—" He lowered his voice. "How is there a regular channel for a place like this?" Quinn ducked under the tape and crouched beside the body. "There are a lot of things that don't make sense right now. Let's focus on what does." She pulled on a pair of nitrile gloves. "Walk me through what we know." "Victim is Eva Kowalski, twenty-six years old. Positive ID from her museum credentials." Brennan consulted his notebook with trembling hands. "No visible wounds. No signs of struggle. The medical examiner's initial assessment was cardiac arrest, but he seemed... uncertain." "Uncertain how?" "He said her heart looked like it had been running for days. Like it just burned out." Quinn frowned. She examined Eva's face—peaceful, almost serene. Her green eyes were open, staring at the curved ceiling. A strand of curly red hair had
been tucked
behind her left ear, and something about that small detail made Quinn's chest ache with a grief she had no right to feel. She'd been
watch
ing Eva Kowalski for weeks. Following her movements, cataloging her associations, trying to understand her connection to Aurora Vance and the strange occurrences that
seemed to
follow that clique
like shadows. Eva had seemed harmless—bookish, nervous, forever buried in research about folklore and ancient history. The kind of woman who apologized to lampposts when she bumped into them. Not the kind of woman who ended up dead in a supernatural black market. "What was she doing here?" Quinn muttered. "Buying something, we think." Brennan pointed to the satchel. "We found a receipt tucked into one of the books. Something called a Veil Compass." Quinn reached for the satchel,
carefully
extracting the books one by one. Texts on alchemy, Renaissance grimoires, a battered copy of something called *Portals and Passages: A History of Threshold Magic*. Tucked between the pages of the last book was a handwritten receipt on paper that felt like dried leaves. *One Veil Compass. Brass casing, protective sigils. Points toward nearest rift or portal.* *Payment received in full. May shadows guide your path.* "She bought a compass that points to supernatural rifts," Quinn said
slowly
. "Why would a museum researcher need something like that?" "Maybe she was investigating something. For work." "The British Museum's restricted archives don't exactly deal in magic compasses, Brennan." She continued searching the body, her fingers finding a small brass object in Eva's coat pocket. The compass was heavier than it looked, its casing covered in a patina of verdigris that spoke to considerable age. Strange symbols
were etched
into the face—sigils, if she had to guess, though she had no framework for understanding them. The needle spun
lazily
, pointing toward something behind Quinn's left shoulder. She pocketed it without thinking. Evidence, she told herself. She
was preserving
evidence. "Detective?" A new voice. Quinn turned to find a woman standing at the edge of the crime scene—tall, elegantly dressed in a charcoal coat that probably cost more than Quinn's monthly salary. Her silver hair
was swept
back from a face that might have been beautiful if not for the
calculating
coldness in her pale eyes. "I'm sorry, this is an active crime scene. You'll need to—" "I'm Dr. Helena Vance." The woman smiled, and it didn't reach her eyes. "Aurora's mother. I believe you've been investigating my daughter?" Quinn rose
slowly
. "Dr. Vance. This isn't an appropriate time." "On the contrary, Detective. This is the perfect time." Helena stepped closer, her gaze moving to Eva's body with an expression that might have been regret or might have been calculation. "Miss Kowalski was a friend of my daughter's. I'd like to understand what happened to her." "So would I." "Then perhaps we can help each other." Helena's pale eyes fixed on Quinn. "I imagine the evidence is confusing you. A young woman, dead without apparent cause, in a location that shouldn't exist. Your medical examiner will find nothing useful. Your forensic team will be baffled. You'll file a report that raises more questions than it answers, and eventually this case will end up in a drawer somewhere, forgotten." Quinn's sharp jaw tightened. "You seem
very
certain of that." "I've seen it happen before. Many times." Helena tilted her head. "You lost a partner three years ago. DS Morris. Under circumstances that were never adequately explained." The words hit Quinn like a physical blow. She kept her face neutral through sheer force of will, but her hand drifted toward her weapon. "How do you know about that?" "I know many things, Detective. Things that might help you understand what happened to Morris. What
really
happened." Helena's smile turned almost sympathetic. "The world is larger than you've been led to believe. More dangerous. And my daughter—for all her faults—is not your enemy." "Your daughter is connected to three suspicious deaths in the past year." "My daughter is trying to prevent more deaths. As was Miss Kowalski, in her own way." Helena gestured toward the body. "Eva came here tonight to purchase a tool. A compass that would help her locate something dangerous—a rift, a doorway between worlds. She wanted to close it before something came through." "And instead she ended up dead." "Yes. Which tells me she wasn't working alone, and she wasn't careful enough." Helena's voice hardened. "Someone knew she was coming. Someone stopped her before she could complete her mission." Quinn looked back at Eva's peaceful face. The tucked hair. The careful arrangement of her body. This wasn't the result of cardiac arrest. This was a message. "Who would want to stop her?" "That, Detective, is the right question." Helena reached into her coat and withdrew a small card. "When you're ready to look beyond the evidence that makes sense, call this number. My daughter will answer. She owes Eva that much." Quinn took the card automatically, her mind still processing. "I can't just—this is a murder investigation. If you have information—" "What I have won't help you in any court. What I have requires you to
accept that everything
you think you know about the world is incomplete." Helena turned to leave, then paused. "The compass in your pocket. Keep it close. When the needle points true north—which it shouldn't be able to do—you'll know you're near the rift Eva died trying to find." "How did you know I—" But Helena Vance was already walking away, her charcoal coat disappearing into the strange crowd of the Veil Market. Quinn stood alone beside the body, the compass heavy in her pocket, the market's impossible lights flickering around her. She thought about Morris—his laugh, his terrible jokes, the look of confusion on his face in those last moments before something she still couldn't explain had taken him. The evidence didn't add up. It never had. And for the first time in three years, Quinn wondered if that was because she'd been looking at the wrong evidence entirely. She pulled out the compass and
watch
ed the needle spin. It settled, pointing toward the darkness of a sealed tunnel at the far end of the platform. Not north. Something else. "Brennan," she said quietly. "I want a full team down here within the hour. Forensics, photography, the works. And I want e
very
thing logged—e
very
thing we find, e
very
thing we see, no matter how strange it seems." "Ma'am, some of this stuff... I don't even know how to describe it in a report." Quinn looked at the young constable with his trembling notebook and his terrified eyes. She remembered being that young. That certain that the world followed rules. "Do your best," she said. "Sometimes the evidence that doesn't make sense is the evidence that matters most." She turned back to Eva Kowalski's body and began, methodically, to look for the truth hidden beneath the impossible.
created_at
"2026-02-17T02:52:19.44792+00:00"
2/17/2026, 2:52:19 AM
model
"anthropic/claude-4.5-opus-20251124"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1864
moderation_latency
173
generation_time
53646
tokens_prompt
923
tokens_completion
2775
native_tokens_prompt
937
native_tokens_completion
2457
native_tokens_completion_images
(null)
native_tokens_reasoning
0
native_tokens_cached
0
num_media_prompt
(null)
num_input_audio_prompt
(null)
num_media_completion
0
num_search_results
(null)
origin
"https://ncbench.com/"
is_byok
false
finish_reason
"stop"
native_finish_reason
"stop"
usage
0.06611
router
(null)
provider_responses
0
id
"558b715b-8d1f-44ea-931a-547ba4244455"
status
200
is_byok
false
latency
1864
endpoint_id
"de32581c-2e11-4f54-8d29-e8a6e19d3038"
provider_name
"Amazon Bedrock"
model_permaslug
"anthropic/claude-4.5-opus-20251124"
api_type
"completions"
id
"gen-1771296685-TxwnpMTXaVmpYiDsjQO9"
upstream_id
"558b715b-8d1f-44ea-931a-547ba4244455"
total_cost
0.06611
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Amazon Bedrock"
Evaluation details
Result
Evaluator
Details
Meta Data
0.0000%
Adverbs in dialogue tags
Target: ≤10% dialogue tags with adverbs
totalTags
4
adverbTagCount
2
adverbTags
0
"Quinn said slowly [slowly]"
1
"she said quietly [quietly]"
60.5634%
AI-ism adverb frequency
Target: <1% AI-ism adverbs (57 tracked)
wordCount
1775
totalAiIsmAdverbs
7
found
0
adverb
"carefully"
count
1
1
adverb
"lazily"
count
1
2
adverb
"slowly"
count
3
3
adverb
"really"
count
1
4
adverb
"very"
count
1
highlights
0
"carefully"
1
"lazily"
2
"slowly"
3
"really"
4
"very"
100.0000%
AI-ism character names
Target: 0 AI-default names (17 tracked, −20% each)
codexExemptions
(empty)
found
(empty)
100.0000%
AI-ism location names
Target: 0 AI-default location names (33 tracked, −20% each)
codexExemptions
(empty)
found
(empty)
88.7324%
AI-ism word frequency
Target: <1% AI-ism words (140 tracked)
wordCount
1775
totalAiIsms
2
found
0
word
"calculating"
count
1
1
word
"etched"
count
1
highlights
0
"calculating"
1
"etched"
100.0000%
Cliche density
Target: ≤1 cliche(s) per 800-word window
totalCliches
0
maxInWindow
0
found
(empty)
highlights
(empty)
100.0000%
Emotion telling (show vs. tell)
Target: ≤3% sentences with emotion telling
emotionTells
0
narrationSentences
99
matches
(empty)
100.0000%
Filter word density
Target: ≤12% sentences with filter/hedge words
filterCount
1
hedgeCount
4
narrationSentences
99
filterMatches
0
"watch"
hedgeMatches
0
"tended to"
1
"seemed to"
2
"appeared to"
100.0000%
Overuse of "that" (subordinate clause padding)
Target: ≤10% sentences with "that" clauses
thatCount
2
totalSentences
133
matches
0
"follow that clique"
1
"accept that everything"
100.0000%
Paragraph length variance
Target: CV ≥0.5 for paragraph word counts
totalParagraphs
60
mean
29.25
std
21.03
cv
0.719
sampleLengths
0
66
1
64
2
38
3
97
4
15
5
33
6
44
7
44
8
2
9
47
10
5
11
24
12
41
13
39
14
2
15
17
16
50
17
60
18
14
19
7
20
24
21
50
22
13
23
9
24
21
25
7
26
12
27
67
28
13
29
1
30
55
31
11
32
22
33
10
34
47
35
3
36
69
37
10
38
27
39
31
40
44
41
12
42
52
43
6
44
30
45
27
46
6
47
39
48
20
49
63
100.0000%
Passive voice overuse
Target: ≤5% passive sentences
passiveCount
4
totalSentences
99
matches
0
"been hidden"
1
"been tucked"
2
"were etched"
3
"was swept"
100.0000%
Past progressive (was/were + -ing) overuse
Target: ≤10% past progressive verbs
pastProgressiveCount
3
totalVerbs
189
matches
0
"wasn't looking"
1
"was selling"
2
"was preserving"
94.0000%
Purple prose (modifier overload)
Target: <4% adverbs, <2% -ly adverbs, no adj stacking
wordCount
1145
adjectiveStacks
1
stackExamples
0
"lay open beside her,"
adverbCount
33
adverbRatio
0.028820960698689956
lyAdverbCount
19
lyAdverbRatio
0.016593886462882096
100.0000%
Repeated phrase echo
Target: ≤20% sentences with echoes (window: 2)
totalSentences
133
echoCount
0
echoWords
(empty)
100.0000%
Sentence length variance
Target: CV ≥0.4 for sentence word counts
totalSentences
133
mean
13.2
std
9.08
cv
0.688
sampleLengths
0
8
1
11
2
31
3
16
4
16
5
22
6
26
7
7
8
17
9
14
10
13
11
33
12
22
13
29
14
15
15
5
16
8
17
20
18
19
19
10
20
15
21
3
22
7
23
2
24
10
25
22
26
2
27
2
28
15
29
7
30
23
31
5
32
13
33
11
34
10
35
25
36
6
37
20
38
19
39
2
40
17
41
2
42
6
43
10
44
32
45
7
46
26
47
14
48
13
49
14
76.4411%
Sentence opener variety
Target: ≥60% unique sentence openers
consecutiveRepeats
5
diversityRatio
0.48120300751879697
totalSentences
133
uniqueOpeners
64
0.0000%
Dialogue tag variety (said vs. fancy)
Target: ≤30% fancy dialogue tags
totalTags
4
fancyCount
3
fancyTags
0
"muttered (mutter)"
1
"Quinn said slowly (say slowly)"
2
"she said quietly (say quietly)"
83.5139%