NC Bench
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Run: 2026-02-17-01KHMR7DEY14SW18RZM7BJJEBW
Run Details
Model:
GPT-5 Mini
Test:
Bad Writing Habits
Scenario:
Mystery: examining a crime scene
Duration:
36.1s
Cost:
$0.009207
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="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 station smelled of old rain and tin, the kind of damp that had soaked into tile and iron and lived there long before the Market moved in. Harlow Quinn kept her shoulders squared against it, as if posture could keep smell and superstition at bay. Her boots made a soft, uniform thud on the cracked platform. The leather strap of her
watch
creaked when she checked the time—military habit, not the orientation of a detective—and the face told her nothing she didn't already know: late enough for the Market to be winding down, early enough for the mood of it to be raw. Strings of mismatched lamps hung over a cluster of stalls where, under ordinary circumstances, someone would be haggling for a bone whistle or a vial that smelled faintly of midnight. Tonight a sheet covered the nearest table, and under it the shape of a body made the hush of the Market
feel
thicker. People lingered at the edges—shadows with wallets and secrets. A Market hand in a patched coat cleared a space for her with the kind of submission reserved for those who carried badges that meant more than law. Eva Kowalski was already there, crouched beside the sheet with her satchel at her feet and the left sleeve of her sweater pulled back as if to keep it clean. She'd pushed her glasses up on a freckled nose and
was tucking
hair behind her left ear with the nervous habit Harlow had
watch
ed form over too many nights of shared coffee and mortuary visits. Up close, Eva's green eyes looked too bright for the subway gloom. "They let you in," Eva said without looking up. Her voice had the careful cadence of someone used to
being told
some things were nonsense and others weren't. She had the look of a museum conservator faced with something fragile and possibly cursed: reverent, annoyed, and entirely keyed into detail. Harlow nodded. "They closed the entrance across Camden Road. Asked the brass if Metropolitan had a warrant." She moved the sheet back with a gloved hand. The body was male, mid-thirties, fine clothes ruined and a coppery sheen around the mouth. The throat bore a shallow ring of abrasion, like fingernails or a wire. There were no fractures, no blunt-force trauma, no obvious cause for the slackness of limbs. The eyes were almost unnaturally clear. Blood pooled at an angle on the platform, not where the body lay but collected in a crescent near the wall tiles. It hadn't congealed into the thick, matte clots Harlow expected; it lay like someone had taken the edge off life and let it spread. She crouched and took in the smear pattern: a long drag from the table edge to the crease at the base of the platform, then a clean break. Whoever had moved this body had worked with intent, not panicked hands. "You tell me what this is, Evie," Harlow said. There was no irony in it; she didn't call Eva that in front of the brass. Eva's name carried other things—mileage in museum corridors, a degree from Oxford, a knack for seeing a sigil where an ordinary person saw graffiti. Eva flipped through the man’s pockets with gloved fingers, the way someone reads a book by skimming the margins. She drew out a small brass compass, its casing dulled by verdigris, its face
etched
with protective sigils that caught the light like old teeth. Harlow's breath caught and she felt the old, stubborn ache in the place where another ghost lived—Morris—then shoved it down. "A Veil Compass," Eva said
softly
, half to Harlow and half to herself. "Shade work. Crafted—" she tapped the metal, "—by a Shade artisan. This points to the nearest supernatural rift." Harlow's first impulse was to catalogue this as evidence: item 1, potential origin, chain of custody. Her second thought was to remember how Morris had once brought her a compass much like this and how control had slipped out of his hands. She leaned forward,
watch
ing the needle. It did not rest. It drifted, minute and precise, and settled, pointing not toward the dark mouth of the old tunnels but toward the tiled wall at the far end of the platform. "It's probably tampered with," Harlow said. She kept her voice flat. It had been flat for three years now, a practiced thing that stood between her and the thing she didn't understand at all. "Needle's been dampened before, or the magnet's been reversed. You can fake a number of effects with brass and a thin wire." "Or—or it was used," Eva countered. Her fingers brushed the compass like a conservator would a relic no one should touch. "Someone took this down, led the rift-shift toward the stall to—" She swallowed. "To hide the exit. To make it look like something else." Harlow studied the compass. The patina around the hinge had a fingerprint dug into it. The skin oil had turned the brass dark in a crescent shape; whoever had held it had something like soot under their nails. There was also a smudge of something pale, chalky, in a sigil across the face that didn't belong to the compass's maker—the line was too fresh, the powder unburned. She checked the body again and saw what the others hadn't. Along the inner wrist of the dead man, neat abrasions circled the bone in a pattern too regular to be mere struggle marks. The abrasions were small, like the serrations from a clasp or the teeth of a metal ring dragged tight. On the back of his hand, a crescent of darker skin
was patterned
as if ringed
tightly
for hours. Harlow peeled back a corner of his sleeve and found the underside of the forearm was cleaner; hairless in the way people shaved their limbs for reasons that had nothing to do with hygiene. Someone had prepared this body. "He's been restrained," she said. "Not killed in a fight. Held. Something on him for a long time. Look at the fingernails. No defensive wounds. That hand didn't reach for a throat—it was busy." "It could be the rift took him," Eva said. "Rifts don't have to—" She hesitated, then added, "They siphon. They take—life-heat. Look at the blood." Harlow looked at the smear again. The blood was colder than it should be; it held a metallic smell that suggested a preservative or a chemical with a haemostatic property. Forensics would have a field day, but Harlow didn't need the lab to tell her acid doesn't smell like tin. The blood bore the faint tang of something burnt: bone ash. The tile had a dusting in a pattern that matched the sigils on the compass face. "Someone ground bone into a powder," she said. "Token work. Bone is entry currency here; people trade with it. They dust the sigils for ceremony, but they also use it to con—make something look ritual when it's a cover." Eva's hand, bare and trembling now, reached for the compass again, and Harlow snapped it back into a chain-of-custody bag like reflex. "You saw the marks?" she asked. "On the wall? The tiles where the blood pooled?" Eva nodded, eyes huge behind her round glasses. "It's not just the compass's needle pointing to the tiles. Someone drew a line—rudimentary—out of ash. Looks like a circle but not complete." Harlow stood and walked the line with the discipline of someone measuring danger as geometry. The circle was clever in its errors, a man-made approximation of something older. The part nearest the ventilation shaft broke the pattern: a faint scuff as if someone had forced the grate and risen through, or placed something heavy against it. "Look for prints," Harlow said. Her voice was small in the hollow of the station, but authority made bodies move. Market hands obliged, and someone produced a cheap lamp. Under yellow light, the tiles told stories: a child's boot—too small and shallow for an adult—made a print near the tile seam, as if to suggest innocence or misdirection. Adult boots traced toward the grate, but there was a peculiar tread there, two parallel slashes in the rubber and a crescent of fine metal filings embedded near the heel. "Custom sole," Eva said, peering. "That's not on the market. Someone commissioned that." Harlow's mouth thinned. Someone had wanted a direction. Someone had wanted it to look like the rift had demanded this man be taken. They'd used the compass to point and ash and token bone to make the scene speak a language of
otherworldly
hunger. But a body doesn't move itself into a staged sigil, and the blood didn't evaporate into a breathless maw. People moved it. Hands did what the rift would not. "Why use a Veil Compass if you're staging?" Eva asked aloud, the question fragile with hope for the thing she wanted to be true. "Because gestures have power if people already believe," Harlow said. "Because if you make it look dangerous enough, people walk away. You don't get a second look after a 'rift.' But you leave traces that point to you if you don't know what to hide." Her mind slid to Morris then—the vague handful of details that had never added up, the compass in his pocket smeared with someone else's oil. She had never allowed herself to
link that memory
to this until now, but the same bittered powder, the same circle half-drawn, the same fresh, skillful abrasions. "Whoever did this is part of the market," she said. "Someone who knows the theatre. Someone who wants us to believe the Market eats its own, because that's a faster deterrent than locks." Eva's fingers found the compass again through the plastic; she traced the pattern of the sigils with a fingertip. "Or someone wants to send a message," she whispered. "To the Shades, to the traders. Show them what happens when someone talks." Harlow felt a step tighten inside her. "Or to me." The thought was small and dangerous. It was not a polite thing for the earth; it prodded at the scar of a partner lost to a set of circumstances that had not been put to rights. "Morris thought a clique was selling something out of the Market. He started poking—he found a compass, maybe. He told me nothing would be ordinary. Maybe some of them haven't forgiven that." A Market hand interrupted, breath hot with fear. "We found this by the grate," he said, offering a torn scrap of leather. It was part of a token pouch, bone dust smudged inside. Someone had
tried to
clean it; the thread
was frayed
, but the stitch pattern was particular—two loops, impossible to do if your hands shook. The Market man looked away when Harlow's eyes landed on the neatness. Harlow folded the leather into evidence. The
watch
on her wrist clicked as she tightened the strap, the sound like a countdown. "We catalogue e
very
thing," she said. "We get a full sweep of prints and fibres. We find anyone who bought a Veil Compass in the last month. We ask who commissioned soles like these." She paused. "And we do not let word
leave that this
was a natural rift. Someone wants that on record." Eva swallowed hard. "You think it's them," she said—the clique. Not a formal name, but a shape they'd both known for months: people who trafficked in the Market's gray morals, who kept secrets too useful to trade away. Harlow stared at the compass through the bag. The needle had settled at last, pointed a hair to the right of where it had pointed when she'd arrived. It was inexplicably warm through the plastic; someone had handled it
very
recently. "We get forensics," she said. "We find the grate. We check the tunnels behind it. And we follow the circulation of bone tokens—who's been buying, who can't explain where they came from." She looked at Eva. "You come with me to the archives. Get me e
very
thing on Shade artisans, on whoever has been commissioning compass work. If this was staged, someone made it possible." Eva tucked her hair behind her ear once more, long enough for Harlow to see the pinch of worry between her brows. "If it's staged," she said quietly, "it might be staged to keep people from seeing a real slip. It could be both." Harlow thought about Morris and the terrible clean cut of unanswered questions. She thought about the Market's tendency to move with the moon, to hide and reappear like a beast with a human face. If the clique had learned to mimic the rift, then the danger was not only supernatural; it was human ingenuity dressed up as terror. "Then we'll prove which one is wearing the mask," she said. Her jaw tightened; the
watch
glinted low on her wrist. "And if it's someone from the Market's inner ring, we'll show them what happens when you
try to
make a ghost of someone who knows the difference." The lamps hummed overhead. Someone pulled the sheet back over the dead man with a tenderness that looked absurd among concrete and ash. Harlow handed the compass-bag to a uniform and
watch
ed the exchange of glances. She felt something else now on the station floor: not the residual trace of a rift but the imprint of a plan, a human thing cut with intent. She took one last look at the half-circle in the ash and the child's boot print and the custom sole tread. There was a message here, faint as a whisper: make them fear, and no one looks for the hands. Harlow walked away from the platform with Eva at her elbow, the Market's noise folding around them like a living thing. She did not like the way her mouth tasted—like metal and old ash. She did not like the knowledge that the compass's needle could be used for deception. But she liked the certainty of the evidence she had: prints, scars, a compass whose face had
been rewritten
, a token pouch, the pattern of things that humans leave when they
try to
look like monsters. Outside, the station mouth led back into rainy Camden and the ordinary lights of a city that did not know it sheltered its own shadow trades. Harlow kept her shoulders squared. Her jaw was sharp. Her
watch
was a metronome. There were questions she would ask tonight and people who would find out Harlow Quinn had a memory too long to be fooled.
created_at
"2026-02-17T02:53:21.810306+00:00"
2/17/2026, 2:53:21 AM
model
"openai/gpt-5-mini-2025-08-07"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
12539
moderation_latency
(null)
generation_time
35964
tokens_prompt
923
tokens_completion
3506
native_tokens_prompt
835
native_tokens_completion
4499
native_tokens_completion_images
0
native_tokens_reasoning
1472
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
0.00920675
router
(null)
provider_responses
0
id
"resp_0be7b5690dbb6fb4016993d7fd7d448194b3d0bcf0926d6b72"
status
200
is_byok
false
latency
141
endpoint_id
"c4f66d01-20b0-4c27-a225-438ea22fda43"
provider_name
"OpenAI"
model_permaslug
"openai/gpt-5-mini-2025-08-07"
api_type
"completions"
id
"gen-1771296765-IwXWWvCgS19wfhj4eFT5"
upstream_id
"resp_0be7b5690dbb6fb4016993d7fd7d448194b3d0bcf0926d6b72"
total_cost
0.00920675
cache_discount
(null)
upstream_inference_cost
0
provider_name
"OpenAI"
Evaluation details
Result
Evaluator
Details
Meta Data
87.8788%
Adverbs in dialogue tags
Target: ≤10% dialogue tags with adverbs
totalTags
22
adverbTagCount
3
adverbTags
0
"Eva said softly, half to Harlow and half to herself [softly]"
1
"She hesitated, then added [then]"
2
"she said quietly [quietly]"
87.7651%
AI-ism adverb frequency
Target: <1% AI-ism adverbs (57 tracked)
wordCount
2452
totalAiIsmAdverbs
3
found
0
adverb
"softly"
count
1
1
adverb
"tightly"
count
1
2
adverb
"very"
count
1
highlights
0
"softly"
1
"tightly"
2
"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)
91.8434%
AI-ism word frequency
Target: <1% AI-ism words (140 tracked)
wordCount
2452
totalAiIsms
2
found
0
word
"otherworldly"
count
1
1
word
"etched"
count
1
highlights
0
"otherworldly"
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
130
matches
(empty)
100.0000%
Filter word density
Target: ≤12% sentences with filter/hedge words
filterCount
3
hedgeCount
2
narrationSentences
130
filterMatches
0
"watch"
1
"feel"
hedgeMatches
0
"tried to"
1
"try to"
100.0000%
Overuse of "that" (subordinate clause padding)
Target: ≤10% sentences with "that" clauses
thatCount
2
totalSentences
144
matches
0
"link that memory"
1
"leave that this"
67.9808%
Paragraph length variance
Target: CV ≥0.5 for paragraph word counts
totalParagraphs
42
mean
57.64
std
22.36
cv
0.388
sampleLengths
0
104
1
90
2
77
3
50
4
75
5
86
6
49
7
64
8
31
9
81
10
56
11
45
12
67
13
111
14
34
15
25
16
77
17
39
18
37
19
31
20
56
21
88
22
13
23
73
24
24
25
45
26
52
27
33
28
41
29
78
30
69
31
75
32
38
33
41
34
64
35
44
36
58
37
48
38
64
39
40
40
85
41
63
100.0000%
Passive voice overuse
Target: ≤5% passive sentences
passiveCount
4
totalSentences
130
matches
0
"being told"
1
"was patterned"
2
"was frayed"
3
"been rewritten"
100.0000%
Past progressive (was/were + -ing) overuse
Target: ≤10% past progressive verbs
pastProgressiveCount
1
totalVerbs
313
matches
0
"was tucking"
94.0000%
Purple prose (modifier overload)
Target: <4% adverbs, <2% -ly adverbs, no adj stacking
wordCount
1900
adjectiveStacks
1
stackExamples
0
"same fresh, skillful abrasions."
adverbCount
56
adverbRatio
0.029473684210526315
lyAdverbCount
12
lyAdverbRatio
0.00631578947368421
100.0000%
Repeated phrase echo
Target: ≤20% sentences with echoes (window: 2)
totalSentences
144
echoCount
0
echoWords
(empty)
100.0000%
Sentence length variance
Target: CV ≥0.4 for sentence word counts
totalSentences
144
mean
16.81
std
9.17
cv
0.545
sampleLengths
0
28
1
18
2
11
3
47
4
30
5
23
6
9
7
28
8
30
9
35
10
12
11
9
12
19
13
22
14
2
15
24
16
15
17
13
18
15
19
6
20
22
21
24
22
28
23
12
24
9
25
16
26
24
27
19
28
25
29
20
30
13
31
18
32
16
33
26
34
6
35
4
36
29
37
6
38
5
39
23
40
22
41
6
42
15
43
13
44
11
45
4
46
11
47
23
48
29
49
11
41.2037%
Sentence opener variety
Target: ≥60% unique sentence openers
consecutiveRepeats
14
diversityRatio
0.3055555555555556
totalSentences
144
uniqueOpeners
44
84.0909%
Dialogue tag variety (said vs. fancy)
Target: ≤30% fancy dialogue tags
totalTags
22
fancyCount
8
fancyTags
0
"Eva said without looking up (say up)"
1
"Eva said softly, half to Harlow and half to herself (say softly)"
2
"Eva countered (counter)"
3
"She hesitated, then added (hesitate, add)"
4
"Eva said, peering (say, peer)"
5
"she whispered (whisper)"
6
"he said, offering a torn scrap of leather (say, offer)"
7
"she said quietly (say quietly)"
91.4566%