NC Bench
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Run: 2026-02-17-01KHMR3ZXG6VNPCWDVKRCJVTNK
Run Details
Model:
GPT-5 Nano
Test:
Bad Writing Habits
Scenario:
Thriller: chase through city streets
Duration:
1m 4s
Cost:
$0.003065
Provider:
OpenAI
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
Rain hammered the neon, turning Camden Street into a faucet of light and concrete. A city that wore water like a coat—drip from awnings, slick underfoot, the air tasting of iron and ozone. Harlow Quinn stood at the curb outside the Raven’s Nest, shoulders square, breath steady, eyes narrowing as a figure broke from the crowd and slid into the night. The suspect wore a hood, rain-darkened jacket clinging to a lean frame, boots scuffing puddles with a stubborn rhythm. Quinn moved with the practiced economy of eighteen years on the force, the air around her tasting of rain and something sharper, the metallic bite of determination. The Nest’s distinctive green neon sign hummed, a thin line of light cutting through the blur of rain. She could hear the bar’s door sigh as it closed behind a departing draught of warmth, a world kept bittersweetly intact inside while the city outside drifted toward a storm. The suspect’s head bobbed once, frantic and economical all at once, the way people
look
when they’ve
decide
d their own exit strategy and it isn’t yours. Quinn’s
watch
rasped against her wrist—a worn leather instrument that had kept time through bad nights and worse cases, a reminder that time had a habit of running out when you needed it most. She kept her pace low, letting the rain do some of the work, letting the city’s noise blur the sound of her own feet. The streets peeled away into alleyways, a chorus of dumpsters and water-streaked walls. The suspect cut left, a narrow path between brick and a stoop where a cat hissed and fell quiet at the sight of the rain’s X-ray glare. The chase wasn’t loud, not in the moment it mattered. It was a series of small decisions—where to step, how fast to move, when to press the angle and when to hold back. The suspect darted between a pair of dumpsters, claws of rain tapping his hood like fingers on a drum, weaving toward something Quinn couldn’t yet see. She cut through a narrow lane where the city pressed in—advertising boards peeling, the plaster walls sweating with damp, the smell of steam and something metallic carried on the wind. He turned a corner where a stairwell spat up a sigh of damp air, a scent of old water and old secrets. The chase tightened, and the barriers that had seemed mere obstacles became landmarks of a larger map she
was reading
with her body. She understood the city’s grammar: the click of a lock, the tremor of a grate, the way a doorway yawns when you’re not
look
ing for a doorway at all but a threshold. The suspect ducked into an alley where the rain pooled and the city’s surface noise dulled into a muffled hum. Quinn kept her pace, footfalls quiet on the slick pavement, breath lifting in small, careful puffs that rose in the orange lamplight and vanished. The alley opened onto a stairwell, a forgotten spine of the metropolis. It wasn’t the Raven’s Nest anymore, not the place where a bartender could give you a
look
that meant more than a thousand words. It was something else, something that belonged to the nights when a secret market woke with the full moon and the city pretended it hadn’t seen what it already knew. The suspect paused, gloved hands pale against the dark, eyes flicking toward the stair’s bottom as if gauging the risk of stepping into a room where the city’s rules grew thin, where magic and memory bled into the concrete. Her breath fogged in the cold, but the rain’s hiss made a ceiling for the chase. She covered the last few steps with the economy of a soldier, a body trained to be almost invisible until it mattered. The stairwell opened into a tunnel of damp stone, the kind of place that smelled of rust and something ancient—like coins and cursed luck traded in a market you could only reach if you knew the password whispered in a language the city forgot it spoke. The tunnel mouth opened into a world that
seemed to
exhale around them, a shift in atmosphere that felt almost ceremonial. The air was cooler here, the damp darker, the soundscape a low, constant murmur—voices too soft to be human unless you listened too long. The walls bore scuffs and chalky, pale glyphs that weren’t graffiti so much as memories
etched
into stone, a map of occurrences that had nothing to do with police reports or council minutes. The structure of the space suggested a transit—an abandoned tube station beneath Camden, the place the Veil Market whispered about in corners of the city, where time moved differently and what you bought could alter your second-hand truth. The takeoff of the chase into the underground was almost ceremonial, as if the city itself drew a curtain and revealed a second stage for those with eyes to see it. Quinn’s shoes met the floor with a dull
resonance
—the kind of sound that said, This is not a place to be loud in, not if you’d rather walk away with your skin intact. The suspect moved with a practiced ease, slinking toward an arch of bone-white light that glowed faintly from within; a doorway that did not exist on any map Quinn had ever studied. The gate bore a rune of simple geometry—nothing fancy, just a circle with a notch—framing the entrance with bone-like whiteness that was somehow alive to the touch, vibrating with a cold that snuck into her bones. The token that hung from the suspect’s wrist glowed with a pale blue sheen, a glow Quinn recognized as something more than color. It was the bone token—the en
try to
the Veil Market, the token that opened bones into doors and doors into bargains that tasted like rain and fear. The suspect reached for the arch, and the token hummed in his palm, a soft, insistent note that
seemed to
resonate with the rhythm of his heartbeat. The Guardian—if such a thing existed here—
seemed to
pause in its task, awaiting the currency of this night: the token’s exchange for a breath of something forbidden. Quinn halted at a few paces behind him, the world narrowing to the sound of rain on stone and the suspect’s measured breathing. The market was a rumor in the city’s mouth, a place people spoke of in a hushed hurry, as if uttering its name could call the things that lived there into the daylight. Here, the air did not feel cold so much as thick with possibility and danger. The hush of voices came and went, gliding along the stalls like a current of leaves in a storm have you ever walked through a memory you did not quite own? She stepped closer, not to crowd him but to study the floor, the gate, the token’s glow. The Veil Market’s entrance carved a quiet border between the normal and the extraordinary, a thin membrane that made the world outside feel almost nostalgic in its ordinariness. The suspect’s breath fogged, and the hood slid back enough to reveal eyes that were not entirely human, the corners of the gaze flickering with a reflection of something not bound by human rules. “Don’t,” Quinn said
softly
, the word almost lost in the rain’s retreating hiss. Her voice carried the
weight
of sixteen cases that should have ended better, the sound of a woman who had learned to live with the consequences of decisions that were never fully hers to begin with. She kept her hands loose at her sides, ready to move into the moment when she would either claim him or be claimed by the market herself. He
look
ed at her then, a quick study of a hunter who dared the trap only for sport. The corners of his mouth curled; a half-smile that knew just how thin the line was between an exit and an error. He spoke without turning fully, the words brushing against the rain and his own urgency. “You’re not supposed to be here,” he said, the timbre of his voice rough with fear and bravado in equal measure. “Not tonight.” She met his gaze, and for a moment she saw the city in his eyes—the same city that wore the rain and wore its own secrets like medals. She did not answer with a question; she answered with action. One step forward, then another, keeping the chase in her peripheral, always reading, always
calculating
the risk: to follow this man into a place where the rules fray, where the dark already knows your name. The crowd around the gate shifted, not quite men and not quite spirits, a blend of those who walked between the lines for a living. Vendors with eyes that glimmered with valuations of souls, parchments, and promises; a woman with a shawl embroidered with sigils that wriggled like living moths under the lamplight; a boy whose smile showed teeth too sharp to be human and too gentle to be a threat. The Veil Market breathed, a collective exhale of many lives, all stacked like shelves in a shop that sold dreams in short supply. Quinn allowed herself a single, measured breath, a moment to re-check the map inside her mind—the file by file memory of the night’s chase and the barriers she had earlier passed in the city’s ordinary world. The suspect pushed forward, stepping through the gateway as if it were a mere doorway in a back corridor rather than the gate to something no longer bound by daylight or jurisdiction. The token’s glow intensified, a soft halo that
seemed to
pulse in time with his pulse, and the air between them grew colder, as if the market itself exhaled with relief at his arrival. The decision pressed on her with
weight
and consequence. If she followed, she would be stepping beyond the boundaries of law into a city that did not keep to the same clocks as London’s daylight. The presence of the clique—a group she had long suspected of criminal collusion with supernatural undertones—
loomed
in every rumor the market greeted with its peculiar, patient reverence. If she descended, she would be leaving the relative safety of the surface where her badge and the city’s rules kept a rough order, and she would walk into a place where the truth could be bought, where power moved through price and threat, where even the air
seemed to
bargain. On the other hand, if she stayed above ground, she might lose him forever to the labyrinth. The suspect was not merely escaping; he
was seeking
something, something that could bring the clique into daylight in a way a precinct map never could. If she let him vanish, the city would wake to another rumor in the morning: the case of the man who vanished into a market that did not exist in the maps of the city’s police files. The memory of DS Morris—the partner she had mourned—surfaced, sudden and unbidden, not supernatural in origin at the time of his death but a wound she had never allowed to close entirely. If the case at hand could reveal the truth behind that loss, perhaps the risk was one she could not afford to avoid. The suspect paused again at the threshold,
look
ed back over his shoulder as if the city itself had given him a signal, then walked through the bone arch and into the Veil Market’s hush. The blue glow of the token steadied, then dimmed to a pale ember as if adjusting to the change of atmosphere. The world beyond the arch became a soundscape of oddities: the soft clink of glass jars filled with luminescent powders, vendors’ whispers that sounded almost musical, a scent like rain on old stone and something colder—ice-wrapped promises. Quinn held her breath for a heartbeat, listening to the moment stretch, the rain in the tunnel stilling as if giving the market a moment of peace before she intruded. The decision pressed against her will with the gravity of a closed door she was about to open with her own hands. The
weight
of the choice was not only about catching a criminal but about stepping into a space where the lines between crime and consequence blurred into something more and far more dangerous. Her gaze
flicked
to the token again, to the way the blue light traced the runes
etched
into the bone, to how the token
seemed to
pulse with a life of its own, a heartbeat that matched the suspect’s own. The market did not welcome those who came uninvited, but it also did not tolerate those who hesitated when the path lay naked before them. The city’s rain, the tunnel’s
echo
, the bone arch’s cold invitation, the suspect’s breath—a chorus
insisting that she move, that she
decide
. She stepped closer to the gate, felt the chill bite at her fingertips, and for a moment the question sharpened into a single brutal line: If I don’t go now, will I ever know what this city hides, what this case hides, what I could do if I dared to walk through? The breath she released steadied the impulse that had quickened in her chest. The decision
was made
not with a roar but with a quiet, stubborn certainty. She would go down after him. She would face the unknown. She would see what the network of lies and fear and whispered bargains called the Veil Market
truly
offered, and what it might do to her once she walked out again. Her boot found a foothold on the first step, damp heat rising from the stone, a draft of something icy and metallic skimming her skin. The stairs extended downward, a throat opening into a world that hummed with a
resonance
not heard in ordinary London air. The gate behind her exhaled a sigh and then closed with a soft, almost polite finality, as if the market had admitted a new guest and
was weighing
whether she would prove to be trouble or treasure. Down here, the rain produced only as steady a drip as a leaky faucet, and the city’s daylight—the one Quinn knew so well—felt like a rumor from another lifetime. The market’s interior lay ahead: stalls lined with curiosities, shelves that
seemed to
breathe, patrons who wore expressions that suggested they
were listening
for something you could only hear if you had learned to listen to the world’s other languages. The chase would test her more than the city’s streets ever had. It would demand a reckoning with a chapter of her career she had not dared to open aloud: the supernatural origin of Morris’s death, the sense that the city’s rules did not govern everything, that there were forces that used streets and markets as corridors for their own purposes. The Veil Market would not care about a detective’s badge or a partner’s name or the reason her train of thought could bend toward something beyond rational explanation. It would care only about outcomes and debts paid in the currency of fear and power. And still, the decision solidified in her chest with the kind of quiet, stubborn certainty that had kept her alive in precincts where the lights never slept. She pressed onward, steps measured, the bone arch fading behind her as the tunnel widened into a vaulted corridor lit by torches and a strange pale luminescence that did not belong to any daylight. The rain’s sound faded to a distant memory, replaced by the market’s own weather—a breath of something old, something hungry, something that would not forget a single visitor’s footprints. The suspect’s silhouette drew deeper into the market’s labyrinth, swallowed by a crowd that did not quite resemble humanity, a chorus of glances that assessed what she might represent—a cop, a disruptor, a stumbling block to whatever the Market chose to unfold tonight. Quinn moved after him with careful speed, her mind mapping the space as if it were a battlefield—every stall a potential ambush, every candlelit corner a possible
sanctuary
for the truth to hide. She did not know what she would find here, but she did know she would not walk away. The city had given her no rest since Morris vanished, not with the whispers of his case still circling her like moths around a flame. Tonight, she would walk toward what the flame warned against, into the Market’s breath, and she would see what truth wore when it came to dinner. Her eyes adjusted to a world where time split into fragments, where a single breath could be weighed, and where the word trust meant something different from the surface. In this place, bargains were not written on paper but
etched
into the air, pressed onto the skin, traded for the right to know a thing before anyone else did. The suspect moved with a practiced, almost filial ease, as if the Market knew him already and was simply allowing him his due. The decision, finally, was a hinge she could not resist. She stepped after him, letting the door vanish behind her as if it had never existed. The ascent of the stair into the Veil Market felt like stepping into a memory the city had forgotten how to forget. The world narrowed to the sound of her own heartbeat and the low murmur that drifted from the stalls, a language of commerce and consequence, a barter of truth for a price someone would pay in the end. She let the Market take its breath and let the Market itself
decide
whether she belonged here. But she knew, as the token’s glow brightened again in the suspect’s grip, that there was no turning back. The chase had become a descent, and the city had given her its keys. Now it was up to her to
decide
what she would unlock.
created_at
"2026-02-17T02:51:57.46773+00:00"
2/17/2026, 2:51:57 AM
model
"openai/gpt-5-nano-2025-08-07"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
10449
moderation_latency
(null)
generation_time
63664
tokens_prompt
914
tokens_completion
5361
native_tokens_prompt
810
native_tokens_completion
7562
native_tokens_completion_images
0
native_tokens_reasoning
3968
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
"completed"
usage
0.0030653
router
(null)
provider_responses
0
id
"resp_0cac66331662c074016993d78d500c8195944c37aa7d73b889"
status
200
is_byok
false
latency
141
endpoint_id
"50329d77-04e1-4979-a184-c33030289476"
provider_name
"OpenAI"
model_permaslug
"openai/gpt-5-nano-2025-08-07"
api_type
"completions"
id
"gen-1771296653-JfF9qMco7Lu4s65R68cG"
upstream_id
"resp_0cac66331662c074016993d78d500c8195944c37aa7d73b889"
total_cost
0.0030653
cache_discount
(null)
upstream_inference_cost
0
provider_name
"OpenAI"
Evaluation details
Result
Evaluator
Details
Meta Data
22.2222%
Adverbs in dialogue tags
Target: ≤10% dialogue tags with adverbs
totalTags
3
adverbTagCount
1
adverbTags
0
"Quinn said softly, the word almost lost in the rain’s retreating hiss [softly, almost]"
93.3797%
AI-ism adverb frequency
Target: <1% AI-ism adverbs (57 tracked)
wordCount
3021
totalAiIsmAdverbs
2
found
0
adverb
"softly"
count
1
1
adverb
"truly"
count
1
highlights
0
"softly"
1
"truly"
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)
56.9679%
AI-ism word frequency
Target: <1% AI-ism words (140 tracked)
wordCount
3021
totalAiIsms
13
found
0
word
"sanctuary"
count
1
1
word
"resonance"
count
2
2
word
"flicked"
count
1
3
word
"loomed"
count
1
4
word
"calculating"
count
1
5
word
"weight"
count
3
6
word
"echo"
count
1
7
word
"etched"
count
3
highlights
0
"sanctuary"
1
"resonance"
2
"flicked"
3
"loomed"
4
"calculating"
5
"weight"
6
"echo"
7
"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
115
matches
(empty)
100.0000%
Filter word density
Target: ≤12% sentences with filter/hedge words
filterCount
4
hedgeCount
8
narrationSentences
115
filterMatches
0
"look"
1
"watch"
2
"decide"
hedgeMatches
0
"seemed to"
1
"try to"
100.0000%
Overuse of "that" (subordinate clause padding)
Target: ≤10% sentences with "that" clauses
thatCount
2
totalSentences
116
matches
0
"insisting that she move, that she"
30.1489%
Paragraph length variance
Target: CV ≥0.5 for paragraph word counts
totalParagraphs
34
mean
87.94
std
22.47
cv
0.256
sampleLengths
0
107
1
74
2
98
3
111
4
99
5
105
6
84
7
116
8
132
9
104
10
102
11
79
12
76
13
55
14
23
15
74
16
94
17
102
18
113
19
135
20
92
21
85
22
87
23
52
24
69
25
83
26
69
27
105
28
90
29
76
30
69
31
82
32
86
33
62
100.0000%
Passive voice overuse
Target: ≤5% passive sentences
passiveCount
1
totalSentences
115
matches
0
"was made"
100.0000%
Past progressive (was/were + -ing) overuse
Target: ≤10% past progressive verbs
pastProgressiveCount
4
totalVerbs
448
matches
0
"was reading"
1
"was seeking"
2
"was weighing"
3
"were listening"
100.0000%
Purple prose (modifier overload)
Target: <4% adverbs, <2% -ly adverbs, no adj stacking
wordCount
3012
adjectiveStacks
0
stackExamples
(empty)
adverbCount
96
adverbRatio
0.03187250996015936
lyAdverbCount
19
lyAdverbRatio
0.0063081009296148734
100.0000%
Repeated phrase echo
Target: ≤20% sentences with echoes (window: 2)
totalSentences
116
echoCount
0
echoWords
(empty)
89.9462%
Sentence length variance
Target: CV ≥0.4 for sentence word counts
totalSentences
116
mean
25.78
std
9.66
cv
0.375
sampleLengths
0
14
1
19
2
28
3
19
4
27
5
18
6
30
7
26
8
34
9
24
10
13
11
27
12
10
13
23
14
26
15
30
16
22
17
23
18
32
19
20
20
24
21
12
22
24
23
30
24
39
25
16
26
22
27
46
28
21
29
24
30
33
31
38
32
31
33
33
34
32
35
36
36
23
37
27
38
27
39
27
40
23
41
33
42
15
43
31
44
17
45
28
46
34
47
13
48
36
49
27
26.7241%
Sentence opener variety
Target: ≥60% unique sentence openers
consecutiveRepeats
27
diversityRatio
0.19827586206896552
totalSentences
116
uniqueOpeners
23
8.3333%
Dialogue tag variety (said vs. fancy)
Target: ≤30% fancy dialogue tags
totalTags
3
fancyCount
2
fancyTags
0
"Quinn said softly, the word almost lost in the rain’s retreating hiss (say softly, almost lose retreat)"
1
"The world beyond the arch became a soundscape of oddities: the soft clink of glass jars filled with luminescent powders, (become fill)"
78.1013%