NC Bench
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Run: 2026-02-17-01KHMMGYKV4M6ZEJS5CB3KCPVT
Run Details
Model:
Claude 3.7 Sonnet
Test:
Bad Writing Habits
Scenario:
Thriller: chase through city streets
Duration:
46.0s
Cost:
$0.036696
Provider:
Anthropic
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="4417" name="Tomás Herrera" aliases="Tommy, Tomás, Herrera" pronouns="he/him" species="Human" storyRole="Support"> <eyeColor>warm brown</eyeColor> <hair>short curly dark brown</hair> <height>5'10"</height> <age>29</age> <skinTone>olive skin</skinTone> <scar>scar running along his left forearm from a knife attack</scar> <medallion>Saint Christopher medallion around his neck</medallion> <birthplace>Seville, Spain</birthplace> <description>A former paramedic who provides off-the-books medical care for the clique.</description> <backstory>Born in Seville, Spain. He moved to London to work for the NHS but lost his license after administering unauthorized treatments to supernatural patients.</backstory> </character> <location id="854" name="The Raven's Nest" aliases="the Nest, Raven, Silas' bar" realm="Earth"> <signColor>distinctive green neon sign above the entrance</signColor> <secretRoom>hidden back room accessible through a bookshelf, used for clandestine meetings</secretRoom> <description>A dimly lit bar in Soho, London. The walls are covered with old maps and black-and-white photographs.</description> </location> <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> </codex> Write a fully fleshed out scene of at least 1000 words in the thriller genre. A detective is pursuing a suspect through rain-soaked city streets at night. The chase takes them from the street level down into an underground market. The detective must decide whether to follow the suspect into unfamiliar and potentially dangerous territory. 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 rain-slicked asphalt reflected London's nightscape in
fractured
puddles as Detective Harlow Quinn cut through the darkness. Her boots pounded against the wet pavement, splashing through miniature lakes forming at every curb and gutter. Three blocks and counting. The suspect—a lanky figure in a dark hoodie—darted between late-night pedestrians with frustrating agility. "Police! Stop!" Quinn's voice cut through the ambient noise of the city, but achieved little else. The figure glanced back, face obscured by shadow and rain, before diving down a narrow alleyway. Quinn followed, her breathing measured despite the exertion. Eighteen years on the force had taught her pacing. Her hand instinctively checked her sidearm as she entered the alley—a habit born from experience and loss. Three years since DS Morris had disappeared during what should have been a routine questioning. Three years of nightmares featuring the inexplicable darkness that had swallowed her partner. The alley narrowed, brick walls pressing in from both sides. Ahead, the suspect knocked over a stack of empty crates, sending them clattering across Quinn's path. She vaulted over them without breaking stride, rain pelting her face as she emerged onto a less populated street in Camden. For a moment, she lost sight of her quarry. Quinn paused, scanning the street with practiced efficiency. There—a flash of movement down the steps of what
appeared to
be an abandoned Tube station entrance, cordoned off with faded construction tape. "Dispatch, this is Detective Quinn," she spoke into her radio, wiping rainwater from her brow. "Suspect heading into the old Camden Town station development site. Requesting backup." Static answered her. Quinn checked her radio, tapping it against her palm. Dead. She glanced at her
watch
—the worn leather band dark with rain—noting the time. Nearly midnight. Decision time. The proper procedure would be to wait for backup. But proper procedure hadn't helped Morris, had it? And this suspect
was connected
to the same strange case she'd been quietly pursuing off-books. Four disappearances in three months, all with witnesses reporting bizarre circumstances—impossible circumstances—before each victim vanished. Quinn descended the stairs, drawing her torch and weapon simultaneously. The entrance had
been forced
open, the temporary wall partially dismantled to create a narrow passage. Construction equipment sat abandoned, gathering dust. Quinn slipped through, following fresh footprints in the dust. The old station platform
loomed
ahead, dimly lit by what
appeared to
be gas lamps—an anachronistic choice for a construction site. Quinn frowned, moving forward with growing caution. Something wasn't right. The platform shouldn't be accessible yet; the renovation project had barely broken ground according to city records. Yet here was a platform that looked... used. Not the
pristine
preservation of a heritage site, but the lived-in wear of daily traffic. And there was traffic—shadows moving in the periphery of her vision, figures that darted away when she turned her torch toward them. The suspect was nowhere to be seen, but a narrow staircase at the far end of the platform led deeper below ground. A soft, ambient hum of voices and movement rose from below—far too many people for an abandoned station at midnight. As Quinn approached the stairs, a man emerged from below. He froze upon seeing her, eyes widening at the gun in her hand. He was handsome in a rough way, olive-skinned with short curly dark hair. Quinn immediately noted the scar running along his left forearm and the Saint Christopher medallion
gleaming
against his chest. "This area is restricted," Quinn said, keeping her voice authoritative. "Metropolitan Police. I'm pursuing a suspect." The man's eyes
flicked
to her face, then to her gun, then back up. "You shouldn't be here, Detective," he said, his Spanish accent evident. "It's dangerous for... uninvited guests." Quinn raised an eyebrow. "I don't need an invitation to pursue a suspect. Who are you?" "Tomás Herrera." He didn't offer identification or explanation. Instead, he took a careful step toward her, hands visible. "You're Detective Quinn, yes? The one asking questions about the disappearances?" Quinn's grip tightened on her weapon. "How do you know my name?" "Word gets around." Herrera glanced over his shoulder toward the stairwell. "Your suspect went down there, into the Market. If you follow, I cannot guarantee your safety." "The Market?" Quinn's mind raced through possibilities. Some kind of black market operation? Drug den? Human trafficking? "What exactly is down there, Mr. Herrera?" "Things you're not ready to understand." His tone softened. "Like what happened to your partner, DS Morris." The mention of Morris hit Quinn like a physical blow. She took a step forward, torch beam directed squarely at Herrera's face. "What do you know about Morris?" Herrera blinked in the harsh light but didn't back away. "Only rumors. But if you go down there without protection, without a token, you risk the same fate." "And what fate
is that?" Quinn
demanded. Instead of answering, Herrera reached
slowly
into his pocket and withdrew a small object. He held it out on his palm—a small token carved from what
appeared to
be bone,
etched
with symbols Quinn didn't recognize. "Take it," he said. "It will grant you passage. But stay close to me, speak to no one, and touch nothing. The Market operates by different rules than your world." Quinn hesitated, suspicion warring with the desperate need for answers. "My world? You make it sound like I'm crossing into another country." "In a way," Herrera said, "you are." The rational part of Quinn's mind screamed warnings. This had all the hallmarks of a trap—a suspicious character, an underground location, a mysterious token. Yet something in Herrera's expression seemed genuine, and the mention of Morris... She took the token, feeling its unnatural warmth against her palm. "Follow me," Herrera said. "And holster your weapon. Guns draw attention, and attention is the last thing you want down there." Against her better judgment, Quinn holstered her sidearm but kept her hand near it. "Lead the way, Mr. Herrera. But understand—if this is a trap, I will hold you personally responsible." Herrera's lips quirked in what might have been a smile. "Fair enough, Detective." They descended the narrow stairs, the ambient noise growing louder with each step. The stairwell opened onto a scene that stopped Quinn in her tracks. The space below was impossibly vast for an underground station—a sprawling marketplace that str
etched
beyond what architectural logic should allow. Stalls and shops lined twisting pathways lit by mismatched lights—gas lamps, electric bulbs, and what
appeared to
be floating orbs of blue flame.
The air was thick with
unfamiliar scents—incense, exotic spices, and something metallic that reminded Quinn of blood. And the people—if they could all be called people. Many looked human enough, but others... Quinn's mind struggled to process figures that
seemed to
o tall, too angular, or possessed features that shifted when viewed directly. A woman with what
appeared to
be scales along her neck. A man whose shadow moved independently of his body. "Welcome to the Veil Market," Herrera said quietly. "Keep that token visible and stay close." "What is this place?" Quinn whispered, her worldview cracking at the foundations. "A marketplace for those who exist between worlds. Those your laws don't acknowledge or protect." Herrera guided her through the crowd, which parted subtly before them. "Your suspect came this way. Probably heading to the Raven's Nest." "The what?" "A bar. Meeting place. Neutral ground for certain... factions." Herrera glanced sideways at her. "Your suspect works for the bar's owner. Not as a criminal—as protection." Quinn struggled to process this information while simultaneously absorbing the impossible sights around her. A stall selling bottles of liquid light. Another with what
appeared to
be living shadows caged in glass spheres. A tall, thin merchant with elongated fingers exchanging gold coins for what looked like ordinary playing cards. "This can't be real," she muttered. "But it is," Herrera replied. "And it's been here, beneath your city, for centuries. Moving locations with each full moon to avoid detection." They turned down a narrower path, and ahead Quinn saw a distinctive green neon sign illuminating the entrance to what
appeared to
be a pub carved directly into the tunnel wall: THE RAVEN'S NEST. "Your suspect will be inside," Herrera said. "But before we enter—what exactly are they suspected of?" Quinn hesitated, professional caution warring with her desperate need for answers. "Connection to four disappearances. Possibly... Morris's too." Herrera's expression softened with something like pity. "Morris wasn't taken by any criminal, Detective. He saw something he shouldn't have—something from the other side of the Veil—and he couldn't turn away. Some minds can't reconcile such revelations." "What are you
saying? That he
went mad? Killed himself?" Quinn demanded, anger flaring. "No." Herrera touched his medallion briefly. "I'm saying he crossed over. Voluntarily. And if you're not careful, you might follow the same path." Quinn stared at the bar entrance, rain from the streets above still dripping from her coat. Everything she knew about the world—about reality itself—seemed
suddenly
fragile, like tissue paper dissolving in water. But one thing remained solid: her need for answers. "Let's go," she said, gripping the bone token
tightly
. "I've come too far to turn back now." The green neon light bathed her face as she stepped toward the entrance, leaving behind the world she understood and advancing into one where the rules were yet to be learned.
created_at
"2026-02-17T01:48:49.910093+00:00"
2/17/2026, 1:48:49 AM
model
"anthropic/claude-3-7-sonnet-20250219"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
441
moderation_latency
(null)
generation_time
45972
tokens_prompt
914
tokens_completion
2577
native_tokens_prompt
917
native_tokens_completion
2263
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
0.036696
router
(null)
provider_responses
0
id
"msg_0194rPCso8r8bktAEjcHSUEC"
status
200
is_byok
false
latency
441
endpoint_id
"1347c8dc-12f5-47df-8355-3ec7e80a8c67"
provider_name
"Anthropic"
model_permaslug
"anthropic/claude-3-7-sonnet-20250219"
api_type
"completions"
id
"gen-1771292883-p1wMqRoBgdIqzFLdZwaF"
upstream_id
"msg_0194rPCso8r8bktAEjcHSUEC"
total_cost
0.036696
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Anthropic"
Evaluation details
Result
Evaluator
Details
Meta Data
85.7143%
Adverbs in dialogue tags
Target: ≤10% dialogue tags with adverbs
totalTags
14
adverbTagCount
2
adverbTags
0
"Herrera said quietly [quietly]"
1
"she said, gripping the bone token tightly [tightly]"
81.0127%
AI-ism adverb frequency
Target: <1% AI-ism adverbs (57 tracked)
wordCount
1580
totalAiIsmAdverbs
3
found
0
adverb
"slowly"
count
1
1
adverb
"suddenly"
count
1
2
adverb
"tightly"
count
1
highlights
0
"slowly"
1
"suddenly"
2
"tightly"
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)
62.0253%
AI-ism word frequency
Target: <1% AI-ism words (140 tracked)
wordCount
1580
totalAiIsms
6
found
0
word
"flicked"
count
1
1
word
"gleaming"
count
1
2
word
"loomed"
count
1
3
word
"pristine"
count
1
4
word
"fractured"
count
1
5
word
"etched"
count
1
highlights
0
"flicked"
1
"gleaming"
2
"loomed"
3
"pristine"
4
"fractured"
5
"etched"
100.0000%
Cliche density
Target: ≤1 cliche(s) per 800-word window
totalCliches
1
maxInWindow
1
found
0
label
"air was thick with"
count
1
highlights
0
"The air was thick with"
100.0000%
Emotion telling (show vs. tell)
Target: ≤3% sentences with emotion telling
emotionTells
0
narrationSentences
106
matches
(empty)
100.0000%
Filter word density
Target: ≤12% sentences with filter/hedge words
filterCount
1
hedgeCount
8
narrationSentences
106
filterMatches
0
"watch"
hedgeMatches
0
"appeared to"
1
"seemed to"
100.0000%
Overuse of "that" (subordinate clause padding)
Target: ≤10% sentences with "that" clauses
thatCount
2
totalSentences
132
matches
0
"is that?\" Quinn"
1
"saying? That he"
100.0000%
Paragraph length variance
Target: CV ≥0.5 for paragraph word counts
totalParagraphs
53
mean
29.26
std
14.7
cv
0.502
sampleLengths
0
52
1
32
2
62
3
47
4
40
5
27
6
30
7
47
8
41
9
48
10
45
11
42
12
55
13
16
14
30
15
16
16
29
17
12
18
27
19
24
20
17
21
28
22
28
23
7
24
36
25
30
26
22
27
7
28
36
29
11
30
21
31
31
32
13
33
25
34
60
35
55
36
15
37
12
38
37
39
2
40
26
41
50
42
6
43
23
44
34
45
16
46
18
47
37
48
14
49
23
100.0000%
Passive voice overuse
Target: ≤5% passive sentences
passiveCount
2
totalSentences
106
matches
0
"was connected"
1
"been forced"
100.0000%
Past progressive (was/were + -ing) overuse
Target: ≤10% past progressive verbs
pastProgressiveCount
0
totalVerbs
207
matches
(empty)
94.0000%
Purple prose (modifier overload)
Target: <4% adverbs, <2% -ly adverbs, no adj stacking
wordCount
1171
adjectiveStacks
1
stackExamples
0
"short curly dark hair."
adverbCount
34
adverbRatio
0.029035012809564473
lyAdverbCount
22
lyAdverbRatio
0.018787361229718188
100.0000%
Repeated phrase echo
Target: ≤20% sentences with echoes (window: 2)
totalSentences
132
echoCount
0
echoWords
(empty)
100.0000%
Sentence length variance
Target: CV ≥0.4 for sentence word counts
totalSentences
132
mean
11.75
std
6.28
cv
0.535
sampleLengths
0
17
1
17
2
4
3
14
4
16
5
16
6
8
7
9
8
17
9
15
10
13
11
10
12
16
13
21
14
9
15
8
16
23
17
15
18
12
19
3
20
9
21
1
22
13
23
2
24
2
25
9
26
8
27
15
28
15
29
10
30
16
31
6
32
9
33
21
34
7
35
3
36
17
37
7
38
1
39
15
40
22
41
22
42
20
43
10
44
13
45
13
46
19
47
10
48
6
49
14
76.5152%
Sentence opener variety
Target: ≥60% unique sentence openers
consecutiveRepeats
4
diversityRatio
0.4772727272727273
totalSentences
132
uniqueOpeners
63
32.1429%
Dialogue tag variety (said vs. fancy)
Target: ≤30% fancy dialogue tags
totalTags
14
fancyCount
8
fancyTags
0
"she spoke into her radio, wiping rainwater from her brow (speak wipe)"
1
"Quinn said, keeping her voice authoritative (say, keep)"
2
"demanded (demand)"
3
"Herrera said quietly (say quietly)"
4
"whispered (whisper)"
5
"she muttered (mutter)"
6
"demanded (demand)"
7
"she said, gripping the bone token tightly (say, grip)"
90.0830%