NC Bench
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Run: 2026-02-17-01KHMN09EXG1VWZ5WJKXZDH2SE
Run Details
Model:
Claude 3.7 Sonnet
Test:
Bad Writing Habits
Scenario:
Thriller: chase through city streets
Duration:
46.5s
Cost:
$0.035706
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 hammered London's streets with merciless persistence, transforming Soho into a
glistening
maze of reflections. Detective Harlow Quinn's boots splashed through puddles as she sprinted after the hooded figure who'd bolted from The Raven's Nest moments earlier. Her breath came in controlled bursts, the discipline of two decades on the force keeping her pace steady even as her quarry darted between late-night revelers. "Police! Stop!" she shouted, knowing it was futile. The suspect—male, approximately six feet, athletic build—had
been seated
at the bar's corner when Quinn entered. His immediate flight when she'd flashed her warrant card confirmed her suspicions. Three weeks of surveillance on The Raven's Nest had finally yielded movement. Quinn sidestepped a startled couple, her focus locked on the suspect's dark silhouette now turning
sharply
down an alley. Her worn leather
watch
slapped against her wrist as she accelerated. The timepiece had been with her longer than most relationships—a gift from DS Morris before he'd vanished during that warehouse raid three years ago. The alley narrowed, brick walls pressing in from both sides. The suspect vaulted over a chain-link fence with practiced ease. Quinn followed, her body remembering the motions from academy training despite the protests of her forty-one-year-old knees. She landed with military precision, barely breaking stride. "You're just making this worse for yourself," she called out, her voice steady despite the exertion. Ahead, the suspect knocked over a stack of wooden pallets. Quinn hurdled them, the gap between them narrowing. She
was gaining
. The chase led them deeper into a labyrinth of service roads and loading bays behind Camden's main thoroughfares, away from the neon-lit streets into the city's shadowy arteries. The rain intensified, plastering Quinn's salt-and-pepper hair to her scalp. Water trickled down her neck, but she registered the discomfort only distantly. What mattered was the figure ahead—the same figure who'd
been photographed
meeting with three different victims before they'd turned up dead, their bodies drained of blood in ways the medical examiner couldn't explain. The suspect darted down a set of crumbling stone
steps that Quinn
hadn't noticed until she was nearly upon them. They descended steeply into darkness, disappearing beneath street level. The entrance to an abandoned Tube station, its existence scrubbed from most modern maps. Quinn slowed, drawing her service weapon and flashlight. The beam cut through the darkness, illuminating graffiti-covered walls and debris-strewn steps. Her instincts screamed caution, but the suspect was still in view, his
footsteps
echoing
from below. Protocol dictated waiting for backup before entering an unknown subterranean space. But backup meant explanations, and Quinn had precious few that wouldn't sound delusional. How could she
explain that the
victims' blood hadn't
been spilled
—it had simply vanished from their bodies? Or that each crime scene had contained traces of a substance forensics couldn't identify? Decision made, Quinn descended, keeping her back to the wall. The staircase spiraled deeper than expected, the air growing noticeably warmer and heavy with unfamiliar scents—incense, exotic spices, and something acrid that burned her nostrils. The staircase emptied into what had once been a platform. Quinn froze at the threshold, momentarily stunned by the transformation. What should have been an abandoned space had become a bustling marketplace. Stalls lined both sides of the platform, illuminated by mismatched lanterns and strings of lights. Vendors called out in languages Quinn recognized and others she didn't. The crowd itself was... wrong. Quinn's brain struggled to process figures moving beneath hoods and cloaks that concealed too little or too much. A woman with skin like polished obsidian haggled with a hunched figure whose hands bore too many joints. A man with gill-like slits on his neck examined a vial of luminescent liquid. Quinn instinctively retreated into the shadows of the stairwell, holstering her weapon. Drawing attention here seemed unwise. Her suspect was moving purposefully through the crowd toward the far end of the platform. She needed to follow, but stepping into that throng meant exposing herself in an environment where she was clearly the outsider. "First time at the Veil Market, Detective?" Quinn spun, weapon halfway drawn before she registered the voice. Leaning against the wall behind her was a man with warm brown eyes and a Saint Christopher medallion
glinting
at his throat. "Tomás Herrera," Quinn said, recognition clicking into place from her case files. "You're the ex-paramedic who works with the Raven's Nest crowd." Herrera's expression revealed nothing, but his eyes
flicked
briefly to her holstered weapon. "Your reputation precedes you, Detective Quinn," he said, his Spanish accent subtle but present. "Most police avoid this place. The ones who stumble in by accident rarely leave with their sanity intact." "I'm pursuing a suspect in multiple homicides," Quinn said, gesturing toward the market where her quarry
was disappearing
into the crowd. "I don't have time for cryptic warnings." "The man you're chasing is headed to see the Bone Merchant," Herrera said. "You won't reach him without a token, and even if you could, you wouldn't survive the encounter without protection." Quinn studied Herrera, noting the scar running along his left forearm—reportedly from protecting a victim during a knife attack that had ultimately cost him his medical license. His file listed him as a person of interest, not a confirmed criminal. Someone who operated in gray areas but wasn't known for violence. "Why are you helping me?" she asked. "I'm not," Herrera said. "I'm preventing a bloodbath. The Market moves locations every full moon. Tonight's the last night at this station. The security is... less tolerant of intrusions." Beyond them, the suspect had reached a makeshift gate fashioned from what
appeared to
be actual human ribcages. He presented something to the monstrous figure guarding it—a small white token. "I need to get through there," Quinn said. "You need a bone token," Herrera replied. "And I happen to have a spare." He produced a small ivory-colored disk from his pocket, rolling it between his fingers. "But I want something in exchange." "I don't negotiate with—" "With what, Detective? Criminals? Witnesses? People trying to keep the peace between worlds you don't understand?" Quinn's jaw tightened. Her suspect would disappear any moment. "What do you want?" "The file you have on me. I want it expunged." "I can't just delete official records." "Not all of it. Just the supernatural connections you've been documenting. The ones your superiors would dismiss as fantasy." His expression softened
slightly
. "I help people, Detective. People the NHS won't or can't treat." Quinn glanced toward the gate where her suspect was now passing through. Decision time. "Fine," she said. "But you're coming with me." Surprise
flickered
across Herrera's face. "That wasn't our agreement." "New terms. I need a guide, and you need insurance that I'll keep my word." She stepped closer, her voice dropping. "And maybe you can explain what happened to my partner three years ago." Herrera's
eyes widened
fractionally. "What makes you think I know anything about DS Morris?" "Because the last person to see him alive was receiving treatment from you for an 'unusual condition.' His disappearance file mentions a witness matching your description." Rain water dripped from Quinn's jacket onto the concrete between them. The distant sounds of the market
seemed to
fade as they assessed each other. Finally, Herrera nodded. "I'll take you through. But understand this—down here, your badge means nothing. Your gun means less than nothing. Some things in the Veil Market see human weapons as insults rather than threats." He pressed the bone token into her palm. It was unnervingly warm to the touch, like it had
been carried
close to a body—or was somehow still part of one. "Follow my lead. Speak only when spoken to. Don't stare at anyone or anything for too long. If I say run, you run—no questions." Quinn closed her fingers around the token, its edges digging into her palm. "Let's go." Herrera led her into the market, weaving expertly through the crowd. Quinn stayed close, hyper-aware of the strange gazes following their progress. Some vendors pulled covers over their merchandise as they passed. Others called out to Herrera in languages that made Quinn's ears ache. As they approached the bone gate, Quinn caught glimpses of wares that defied explanation—bottles containing miniature thunderstorms, jewelry that shifted and moved when not directly observed, weapons that seemed partially transparent. The gate guardian turned as they approached—a hulking figure whose features
seemed to
ripple and shift beneath a cowl. Quinn forced herself to breathe evenly, focusing on the familiar
weight
of her
watch
against her wrist rather than the impossible creature before her. Herrera spoke
softly
to the guardian while Quinn presented her token. The ivory disk grew painfully hot in her palm before crumbling to dust. The guardian stepped aside. Beyond the threshold lay another world entirely—one that might provide answers to the unexplainable deaths haunting London's streets, and perhaps to the fate of her partner. But as Quinn stepped through, she knew with absolute certainty that she
was crossing
a line from which her life could never fully return.
created_at
"2026-02-17T01:57:13.274824+00:00"
2/17/2026, 1:57:13 AM
model
"anthropic/claude-3-7-sonnet-20250219"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
423
moderation_latency
(null)
generation_time
45967
tokens_prompt
914
tokens_completion
2505
native_tokens_prompt
917
native_tokens_completion
2197
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
0.035706
router
(null)
provider_responses
0
id
"msg_01P4Y7ZVTLBbmdvfrGMdbfoZ"
status
200
is_byok
false
latency
423
endpoint_id
"1347c8dc-12f5-47df-8355-3ec7e80a8c67"
provider_name
"Anthropic"
model_permaslug
"anthropic/claude-3-7-sonnet-20250219"
api_type
"completions"
id
"gen-1771293386-B9mOg78N3GqhRgC3DPea"
upstream_id
"msg_01P4Y7ZVTLBbmdvfrGMdbfoZ"
total_cost
0.035706
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Anthropic"
Evaluation details
Result
Evaluator
Details
Meta Data
100.0000%
Adverbs in dialogue tags
Target: ≤10% dialogue tags with adverbs
totalTags
12
adverbTagCount
0
adverbTags
(empty)
80.3922%
AI-ism adverb frequency
Target: <1% AI-ism adverbs (57 tracked)
wordCount
1530
totalAiIsmAdverbs
3
found
0
adverb
"sharply"
count
1
1
adverb
"slightly"
count
1
2
adverb
"softly"
count
1
highlights
0
"sharply"
1
"slightly"
2
"softly"
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)
54.2484%
AI-ism word frequency
Target: <1% AI-ism words (140 tracked)
wordCount
1530
totalAiIsms
7
found
0
word
"flickered"
count
1
1
word
"flicked"
count
1
2
word
"glistening"
count
1
3
word
"glinting"
count
1
4
word
"weight"
count
1
5
word
"footsteps"
count
1
6
word
"echoing"
count
1
highlights
0
"flickered"
1
"flicked"
2
"glistening"
3
"glinting"
4
"weight"
5
"footsteps"
6
"echoing"
100.0000%
Cliche density
Target: ≤1 cliche(s) per 800-word window
totalCliches
1
maxInWindow
1
found
0
label
"eyes widened/narrowed"
count
1
highlights
0
"eyes widened"
100.0000%
Emotion telling (show vs. tell)
Target: ≤3% sentences with emotion telling
emotionTells
0
narrationSentences
92
matches
(empty)
100.0000%
Filter word density
Target: ≤12% sentences with filter/hedge words
filterCount
2
hedgeCount
3
narrationSentences
92
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
114
matches
0
"steps that Quinn"
1
"explain that the"
100.0000%
Paragraph length variance
Target: CV ≥0.5 for paragraph word counts
totalParagraphs
51
mean
29.49
std
16.52
cv
0.56
sampleLengths
0
64
1
8
2
40
3
54
4
45
5
16
6
49
7
55
8
43
9
36
10
55
11
35
12
58
13
55
14
53
15
7
16
32
17
22
18
13
19
32
20
28
21
32
22
51
23
7
24
29
25
30
26
8
27
14
28
20
29
4
30
16
31
13
32
10
33
6
34
34
35
14
36
8
37
9
38
34
39
14
40
26
41
25
42
35
43
30
44
24
45
15
46
44
47
31
48
43
49
28
100.0000%
Passive voice overuse
Target: ≤5% passive sentences
passiveCount
4
totalSentences
92
matches
0
"been seated"
1
"been photographed"
2
"been spilled"
3
"been carried"
100.0000%
Past progressive (was/were + -ing) overuse
Target: ≤10% past progressive verbs
pastProgressiveCount
3
totalVerbs
213
matches
0
"was gaining"
1
"was disappearing"
2
"was crossing"
84.0818%
Purple prose (modifier overload)
Target: <4% adverbs, <2% -ly adverbs, no adj stacking
wordCount
1174
adjectiveStacks
2
stackExamples
0
"illuminating graffiti-covered walls"
1
"small ivory-colored disk"
adverbCount
41
adverbRatio
0.03492333901192504
lyAdverbCount
29
lyAdverbRatio
0.024701873935264053
100.0000%
Repeated phrase echo
Target: ≤20% sentences with echoes (window: 2)
totalSentences
114
echoCount
0
echoWords
(empty)
100.0000%
Sentence length variance
Target: CV ≥0.4 for sentence word counts
totalSentences
114
mean
13.19
std
7.17
cv
0.543
sampleLengths
0
16
1
22
2
26
3
8
4
16
5
12
6
12
7
19
8
11
9
24
10
10
11
10
12
17
13
8
14
16
15
10
16
8
17
3
18
28
19
10
20
12
21
33
22
20
23
9
24
14
25
8
26
12
27
16
28
11
29
13
30
17
31
14
32
10
33
25
34
10
35
10
36
12
37
15
38
11
39
4
40
1
41
18
42
18
43
14
44
12
45
5
46
15
47
21
48
7
49
10
66.0819%
Sentence opener variety
Target: ≥60% unique sentence openers
consecutiveRepeats
8
diversityRatio
0.43859649122807015
totalSentences
114
uniqueOpeners
50
70.8333%
Dialogue tag variety (said vs. fancy)
Target: ≤30% fancy dialogue tags
totalTags
12
fancyCount
5
fancyTags
0
"shouted (shout)"
1
"she called out, her voice steady despite the exertion (call out)"
2
"explain (explain)"
3
"Quinn said, recognition clicking into place from her case files (say, click place)"
4
"Quinn said, gesturing toward the market where her quarry was disappearing into the crowd (say, gesture disappear)"
91.5081%