NC Bench
Overview
About
Tests
Models
Vendors
Run: 2026-02-17-01KHMR3FKTNJS8669ZR3P98A21
Run Details
Model:
Claude Sonnet 4.5
Test:
Bad Writing Habits
Scenario:
Mystery: examining a crime scene
Duration:
42.7s
Cost:
$0.030666
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 abandoned platform beneath Camden smelled of rust and old electricity. Detective Harlow Quinn stood at the entrance to what her constables had cordoned off as a crime scene, though the yellow tape looked absurd strung between Victorian iron pillars that had stood here since before the Tube's first expansion. Her worn leather
watch
read half past three in the morning, and the temperature had dropped enough that her breath misted in the beam of her torch. The body lay twenty feet down the platform, positioned too neatly against the curved tile wall. Male, mid-forties, expensive suit now ruined by the pool of blood that had spread beneath him and dried to a dark, tacky substance. The Metropolitan Police photographer had already done her work, and the forensics team
was packing
up their equipment with the efficient movements of people who wanted to be anywhere else. Quinn's jaw tightened as she approached, her boots
echoing
on the concrete. The victim's throat had been cut—a single deep wound, left to right. The weapon was nowhere to be seen. Neither was the victim's wallet, phone, or any form of identification. "Straightforward enough," said Detective Inspector
Marcus
Reed, materializing at her shoulder. He'd been her partner for six months now, ever since—but she didn't let herself finish that thought. Reed gestured at the body with his notebook. "Robbery gone wrong. Victim wanders down here, maybe drunk or lost. Assailant follows, demands valuables, things escalate." Quinn crouched beside the body, careful not to disturb what remained of the scene. "Victim's shoes are clean." "Sorry?" "Look at them." She pointed with her pen. "Italian leather, probably eight hundred pounds new. Not a scuff on them. No dust, no grime. This platform is filthy—you can see our footprints everywhere—but his shoes look like he walked out of a shop." Reed shifted his
weight
. "So he was carried?" "Maybe." But Quinn's attention had already moved to the victim's hands. The right one
was clenched
around something, fingers locked in rigor mortis. She pulled on a latex glove and
carefully
pried the fingers open. A small brass compass tumbled onto her palm. The casing was tarnished, covered in what looked like green corrosion, and the face was scratched all to hell with marks she couldn't quite make out in the dim light. But what caught her attention was the needle. It spun
lazily
, making three full rotations before settling to point directly at the far wall of the platform—nowhere near
magnetic
north. "Broken," Reed said dismissively. "Probably sentimental value. Family heirloom or something." Quinn stood, turning the compass over in her hand. The markings on the face weren't scratches. They were deliberate, carved with precision into the brass. Symbols she didn't recognize but had seen before, three years ago, in the photographs from Morris's case file. The file that had gone missing from the archives two weeks after Morris's death. The file she'd memorized before it disappeared. Her pulse quickened, but her face remained neutral. "When did forensics clear out?" "Ten minutes ago. Said there wasn't much to process. No defensive wounds, minimal struggle, no trace evidence besides what you'd expect in an abandoned station." "Did they dust the pillars?" Reed frowned. "Why would they?" Quinn walked to the nearest iron pillar, running her torch beam along its surface. Rust flaked under her fingertips, decades of oxidation and neglect. But there—about chest height—the rust had
been disturbed
. Not brushed away, exactly. More like burned away in a perfect handprint, the metal beneath showing clean and dark. "
Marcus
, come look at this." He joined her, skepticism clear in his expression. "Could be anything. Kids exploring, homeless using this place as a shelter—" "The victim's blood splatter." Quinn cut him off, directing her torch back toward the body. "Look at the pattern." The blood had spread outward from the neck wound, which was expected. But it had stopped spreading about six inches from the body, forming an almost perfect circle. And the tiles within that circle were
pristine
—no dust, no dirt, nothing but blood and clean ceramic. "Someone cleaned the floor before he was killed," Quinn said. She crouched again, this time examining the perimeter of the blood pool. "But they only cleaned a specific area. Why do that?" Reed was quiet for a moment. "Ritual?" The word hung between them. Reed meant it as a joke—she could hear it in his tone—but Quinn's mind was already racing. The compass needle had steadied now, pointing at the wall with absolute certainty. She stood and followed its direction, stepping
carefully
around the blood. The wall where the needle pointed looked unremarkable at first. Curved white tiles, advertisements from the 1960s still barely visible beneath layers of grime. But when Quinn pressed her palm against it, the tiles were warm. Not hot, but distinctly warmer than the surrounding surfaces. Warmer than they should be in an abandoned station in November. "Feel this," she said. Reed placed his hand beside hers, then pulled it back. "That's—that's odd." Quinn traced the outline of the warm section. Roughly six feet tall, three feet wide. Door-shaped. And there, at what would be waist height on a door, more of those burned-away handprints. "We need to call in structural engineers," Reed said, stepping back. "Could be electrical wiring, gas lines—" "No." Quinn's voice was steady, but something cold had settled in her chest. "This isn't infrastructure." She pulled out her phone and began photographing everything. The warm wall. The handprints. The clean circle around the body. The compass in her hand, its needle
unwavering
. Reed
watch
ed her with growing unease. "Quinn, what are you thinking?" She didn't answer immediately. Instead, she walked back to the body and crouched beside it once more, studying the victim's face. In death, his expression wasn't one of fear or surprise. It was resignation. Like he'd known this
was coming
. His left hand, she noticed now, bore traces of something on the fingertips. She leaned closer, catching a faint smell beneath the copper tang of blood. Chalk. And something else—herbs, maybe? Something organic and old. "I'm thinking," she said finally, "that this wasn't a robbery. I'm thinking our victim came here
deliberately
. I'm thinking someone was waiting for him, and whatever happened here was planned down to the last detail." "Based on a broken compass and some warm tiles?" Quinn stood, meeting her partner's eyes. In the six months they'd worked together, she'd never told him about Morris. Never explained why she sometimes spent her off hours in the archives, pulling files on unexplained deaths and disappearances. Never mentioned the dreams that still woke her at 3 AM, where her old partner called her name from the darkness. "Based on eighteen years of instinct telling me when something doesn't fit." She pocketed the compass, ignoring procedure, ignoring the voice in her head that sounded like her sergeant major from basic training. "I want every camera in a three-block radius pulled. I want background checks on anyone reported in this area in the last week. And I want the archives searched for similar cases—unusual murders in abandoned spaces, victims with no defensive wounds." "That could be dozens of cases—" "Then we start going through them tonight." She headed toward the exit, then paused. "And
Marcus
? Not a word about the compass or the wall to anyone else. Not yet." She could feel his confusion behind her, his half-formed questions. But she kept walking, the brass compass warm against her hip, its needle still spinning uselessly in her pocket. Somewhere in this city, someone had opened a door that shouldn't exist. Someone had killed a man in a place that wasn't entirely on any official map. And three years ago, her partner had died investigating something just like this. Quinn's hand went to her
watch
, fingers tracing the worn leather strap. She'd waited three years for another thread to pull. Now she had one, and she wasn't going to let it slip away.
created_at
"2026-02-17T02:51:19.825351+00:00"
2/17/2026, 2:51:19 AM
model
"anthropic/claude-4.5-sonnet-20250929"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
2342
moderation_latency
171
generation_time
42458
tokens_prompt
923
tokens_completion
2119
native_tokens_prompt
937
native_tokens_completion
1857
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
0.030666
router
(null)
provider_responses
0
id
"bfe216a3-7339-4108-924d-13aee0b743ce"
status
200
is_byok
false
latency
2328
endpoint_id
"d8bee848-f020-454a-b2be-4a7ce868f99f"
provider_name
"Amazon Bedrock"
model_permaslug
"anthropic/claude-4.5-sonnet-20250929"
api_type
"completions"
id
"gen-1771296636-WASURWJW03kdojDRAwzn"
upstream_id
"bfe216a3-7339-4108-924d-13aee0b743ce"
total_cost
0.030666
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
6
adverbTagCount
3
adverbTags
0
"Reed said dismissively [dismissively]"
1
"Reed said, stepping back [back]"
2
"she said finally [finally]"
70.3044%
AI-ism adverb frequency
Target: <1% AI-ism adverbs (57 tracked)
wordCount
1347
totalAiIsmAdverbs
4
found
0
adverb
"carefully"
count
2
1
adverb
"deliberately"
count
1
2
adverb
"lazily"
count
1
highlights
0
"carefully"
1
"deliberately"
2
"lazily"
80.0000%
AI-ism character names
Target: 0 AI-default names (17 tracked, −20% each)
codexExemptions
(empty)
found
0
"Marcus"
100.0000%
AI-ism location names
Target: 0 AI-default location names (33 tracked, −20% each)
codexExemptions
(empty)
found
(empty)
62.8805%
AI-ism word frequency
Target: <1% AI-ism words (140 tracked)
wordCount
1347
totalAiIsms
5
found
0
word
"pristine"
count
1
1
word
"unwavering"
count
1
2
word
"magnetic"
count
1
3
word
"weight"
count
1
4
word
"echoing"
count
1
highlights
0
"pristine"
1
"unwavering"
2
"magnetic"
3
"weight"
4
"echoing"
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
93
matches
(empty)
100.0000%
Filter word density
Target: ≤12% sentences with filter/hedge words
filterCount
2
hedgeCount
0
narrationSentences
93
filterMatches
0
"watch"
hedgeMatches
(empty)
100.0000%
Overuse of "that" (subordinate clause padding)
Target: ≤10% sentences with "that" clauses
thatCount
0
totalSentences
116
matches
(empty)
100.0000%
Paragraph length variance
Target: CV ≥0.5 for paragraph word counts
totalParagraphs
44
mean
30.2
std
21.55
cv
0.714
sampleLengths
0
77
1
69
2
42
3
53
4
18
5
1
6
43
7
8
8
35
9
8
10
60
11
11
12
64
13
13
14
25
15
5
16
5
17
51
18
5
19
20
20
19
21
45
22
32
23
7
24
46
25
56
26
4
27
12
28
32
29
17
30
16
31
34
32
5
33
40
34
35
35
35
36
9
37
59
38
74
39
6
40
30
41
56
42
13
43
34
100.0000%
Passive voice overuse
Target: ≤5% passive sentences
passiveCount
2
totalSentences
93
matches
0
"was clenched"
1
"been disturbed"
100.0000%
Past progressive (was/were + -ing) overuse
Target: ≤10% past progressive verbs
pastProgressiveCount
2
totalVerbs
165
matches
0
"was packing"
1
"was coming"
94.4595%
Purple prose (modifier overload)
Target: <4% adverbs, <2% -ly adverbs, no adj stacking
wordCount
1036
adjectiveStacks
0
stackExamples
(empty)
adverbCount
48
adverbRatio
0.04633204633204633
lyAdverbCount
14
lyAdverbRatio
0.013513513513513514
100.0000%
Repeated phrase echo
Target: ≤20% sentences with echoes (window: 2)
totalSentences
116
echoCount
0
echoWords
(empty)
100.0000%
Sentence length variance
Target: CV ≥0.4 for sentence word counts
totalSentences
116
mean
11.46
std
7.96
cv
0.695
sampleLengths
0
11
1
39
2
27
3
16
4
23
5
30
6
12
7
12
8
7
9
11
10
11
11
17
12
8
13
17
14
14
15
4
16
1
17
8
18
35
19
4
20
4
21
11
22
12
23
12
24
8
25
30
26
8
27
22
28
4
29
7
30
9
31
7
32
9
33
18
34
14
35
7
36
8
37
5
38
25
39
5
40
2
41
3
42
14
43
10
44
8
45
4
46
15
47
5
48
8
49
12
76.7241%
Sentence opener variety
Target: ≥60% unique sentence openers
consecutiveRepeats
6
diversityRatio
0.49137931034482757
totalSentences
116
uniqueOpeners
57
8.3333%
Dialogue tag variety (said vs. fancy)
Target: ≤30% fancy dialogue tags
totalTags
6
fancyCount
4
fancyTags
0
"said Detective Inspector Marcus Reed, materializing at her shoulder (say materialize)"
1
"Reed said dismissively (say dismissively)"
2
"Reed said, stepping back (say, step)"
3
"she said finally (say finally)"
81.9236%