NC Bench
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Run: 2026-02-17-01KHMQKDFDHJAGR1DD53GP8HRW
Run Details
Model:
o4 Mini High
Test:
Bad Writing Habits
Scenario:
Mystery: examining a crime scene
Duration:
27.2s
Cost:
$0.014268
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
Detective Harlow Quinn paused at the mouth of the abandoned Tube stairwell, her booted feet stirring dust motes in the stale London air. The dim vault of the old Camden station yawned before her,
flicker
ing fluorescents overhead casting blotchy pallor across graffiti-scarred tiles. A faint pulse of murmured bartering drifted from deeper in the tunnels—voices too hushed to make out, punctuated by the scrape of crates on concrete. This was the Veil Market tonight: a black market of enchantments and banned lore, shifting like a specter to a new location every full moon. Quinn’s mastiff posture remained rigid, shoulders squared, leather
watch
snug around her left wrist. She inhaled, tasting damp stone and something more metallic—blood, she suspected, or the
echo
of it. Behind her, a lanky figure in a threadbare overcoat tugged at a satchel strap. Eva Kowalski adjusted her round glasses, green eyes wide beneath curls of red hair. Quinn didn’t wait for an invitation. She descended the final steps and followed the
echo
ing voices down a corridor lined with metal stalls. Vendors had packed away most wares—brass talismans, phials of writhing ichor, dusty tomes—leaving only six feet of open space around one stall draped in tattered
velvet
. A yellow police cordon bisected the tunnel; ghostly bodies of uniformed officers stood at its perimeter, nodding when Quinn produced her badge. The body lay face-down in the center of the stall’s cleared zone. The man’s cloak—a midnight blue weave that somehow absorbed ambient light—had parted to reveal a suit stained in blossom-shaped splatters of crimson. Quinn crouched, scanning. The tunnel roof curved low here; steel girders arched overhead. Faint runes, drawn in chalk, traced an inverted triangle around the corpse. Blood had pooled along the chalk lines, darkening them. She dropped to one knee, fingers poised over the mahogany floor tile. The man’s hair shone black, damp in places that weren’t blood. She touched the nape of his neck: skin was warm but slipping cool under bruising. Ligature marks circled like a noose. “He was strangled,” Quinn said
softly
, standing and brushing dust from her trousers. She
flicked
her jawline against stubble of frustration—another ritualistic murder? She met Eva’s gaze. “Your binding-runic theory doesn’t hold. These chalk marks look staged.” Eva’s lips parted. She tucked a curl behind her left ear, nervous habit, and pressed forward. “But Detective, look at the charcoal inlay. That sheen—it’s nightshade root powder, consecrated under a lunar eclipse.” She tipped a small sample vial from her satchel, the dust settling into filigree on her palm. “Whoever did this meant to summon or bind a spirit. The noose was part of the rite.” Quinn stood, arms folded. She
watch
ed vendors and buyers drift past the cordon beyond, their eyes flicking but their voices hushed. In three strides she reached the man’s shoes—Oxford brogues polished so dark they were almost black. Tiny flecks of verdigris powder speckled the laces, dull green. She knelt again and pried one shoe free, revealing a brass compass face stitched into the sole. The petite disc lay flush, its needle quivering toward the back wall. “A Veil Compass,” Eva murmured as Quinn popped the casing open. The brass
was mottled
with green patina. Sigils
etched
across its face shone in the
flicker
ing light. The needle spun wildly, then locked pointing at a jagged seam in the tiled wall. Eva’s glasses caught the reflection. “It’s attuned to supernatural energy—picks up rifts and portals.” Quinn’s chest tightened. DS Morris had carried one of these once. The compass had gone mad just before he... Before he vanished. She bit the corner of her lip and traced the compass needle with her gaze. The seam it aimed at was narrow, nearly invisible where two tile edges misaligned. She leaned in. “Eva, help me.” Gently, Quinn pressed her fingertips against the tile seam. A click sounded, a panel shifting inward. Dust motes swirled beneath her fingers as the wall slid open just enough for her to peer inside. A
flicker
of shifting color—violet and black streamers, like oil on water. The hum of energy thrummed against Quinn’s chest. She straightened. “See that? Not a spirit bound here. Someone’s using a portal.” She gestured to the runes scrawled around the body. “They staged the chalk to cover up murder. This wasn’t ritual. It was a setup to distract from the real crime.” Eva’s brows knitted. “But why?” she whispered. “If they wanted to open the rift, why kill him? And leave him here, obvious?” “Because,” Quinn said, rising, “he was the distraction. The real target was whatever lies beyond this portal. They needed time—enough to stabilize the breach. The corpse forced us to look at the runes, not the wall.” She walked the perimeter of the cordoned zone. Three yellow tags marked pieces of charcoal and iron filings along the tile edge—evidence collected by junior officers. None had noticed the seam. Quinn’s
watch
beeped
softly
; she checked the screen: five missed texts from CID Headquarters, three more from a number she didn’t know. She ignored all of them. Her gaze snapped to an overhead duct. A faint trail of fine powder led up and out of the stall. She followed it, elbowing past uniformed officers. Eva trailed her. “That dust—verdigris? From the compass casing?” “More like slag from the portal’s energy discharge.” Quinn nodded at the powder tracing up the wall, swirling into a ventilation grate. A moment later, a draft sighed back, cold and distant. Quinn jammed her gloved hand into the grate and felt ridges of metal coil inside. “They ran cables or tubing through here to siphon energies. Maybe to power an alchemical engine aboveground.” Eva pressed closer. “But that requires equipment—someone hauling generators into the market, unseen by vendors?” Quinn licked her lips. “Or someone who traded for it here. Only place that deals in banned contraptions.” She turned, scanning other stalls. Most lay empty; a few lingering merchants squared shoulders at the police cordon, their eyes flicking between Quinn and the body. She cleared her throat. “Open the perimeter. I want every stall searched for cables, for arc generators. And tap into ventilation camera feeds. See who entered here last night.” Eva bit her lip. “This isn’t just murder. It’s smuggling supernatural energy. If the breach grows—” “I know.” Quinn fitted the compass back into her breast pocket. The brass warmed against her chest. “And I’m not letting it.” She paused at the body, knelt again, inspecting the chalk. The lines converged at a single point on the man’s spine. She
traced that arcane
crease with a fingertip. “Whoever drew these wanted to pin the focus on the spine—to claim the corpse was animated postmortem.” Eva’s breath caught. “Like a revenant.” “Exactly.” Quinn looked up at her friend’s pale face. “A diversion. The real crime is the portal. And this man—he was a courier. Knew too much, or maybe carrying something through. They silenced him.” Eva tapped her satchel
anxiously
. “What do we do?” Quinn rose, brushing dust from her knees. “Get me a list of every item sold at the Market tonight. Names, descriptions—especially alchemical devices. And cross-reference with any known missing equipment from private collections.” She reached into her coat and extracted a small bone token, polished smooth. “This grant me access. You’ll need one, too, if we’re going deeper.” Eva’s
eyes widened
at the token. “You carry one?” Quinn flipped it in her palm. “I got this from Morris’s locker. We never found where he took it. Now I know why he kept it.” Thunder rumbled somewhere aboveground. The market’s fluorescent lights
flickered
. Quinn looked back at the rift behind the displaced tile panel. Violet tendrils of energy rippled in the seam. She felt a cold itch at her scalp. Her partner’s disappearance bloomed in her memory: the same hum, the same shattered tile edges. She pressed a finger to the compass in her pocket; the sigils on its face gleamed faintly. “You ready?” she asked Eva. Eva nodded, swallowing. She tugged her satchel upright. “Let’s
close that rift
.” Quinn holstered her professionalism and squared her shoulders. “And find whoever’s behind it. Let them bring supernatural forces into the city. I’ll end it.” Above them, the corridor lights stuttered out, plunging the Veil Market into partial darkness. Voices hushed,
footsteps
retreated. In the gloom, two women moved toward the silent breach—one with the precision of a soldier, the other with the knowledge of ancient rites. Between them lay a fracture in reality and the truth of a murder buried beneath misdirection. Quinn took a deep breath, felt the
weight
of the compass and the bone token against her chest, and stepped forward.
created_at
"2026-02-17T02:42:17.573892+00:00"
2/17/2026, 2:42:17 AM
model
"openai/o4-mini-high-2025-04-16"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
4048
moderation_latency
(null)
generation_time
27099
tokens_prompt
923
tokens_completion
2634
native_tokens_prompt
835
native_tokens_completion
3034
native_tokens_completion_images
0
native_tokens_reasoning
1024
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
0.0142681
router
(null)
provider_responses
0
id
"resp_07c7971a9827a526016993d56e2770819789257996f41f0b28"
status
200
is_byok
false
latency
151
endpoint_id
"60020533-2fb2-4aa1-9454-181029fd52de"
provider_name
"OpenAI"
model_permaslug
"openai/o4-mini-high-2025-04-16"
api_type
"completions"
id
"gen-1771296110-YthJRlwNbBtbsaut8vy9"
upstream_id
"resp_07c7971a9827a526016993d56e2770819789257996f41f0b28"
total_cost
0.0142681
cache_discount
(null)
upstream_inference_cost
0
provider_name
"OpenAI"
Evaluation details
Result
Evaluator
Details
Meta Data
77.7778%
Adverbs in dialogue tags
Target: ≤10% dialogue tags with adverbs
totalTags
6
adverbTagCount
1
adverbTags
0
"Quinn said softly, standing and brushing dust from her trousers [softly]"
72.7335%
AI-ism adverb frequency
Target: <1% AI-ism adverbs (57 tracked)
wordCount
1467
totalAiIsmAdverbs
4
found
0
adverb
"anxiously"
count
1
1
adverb
"gently"
count
1
2
adverb
"softly"
count
2
highlights
0
"anxiously"
1
"gently"
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)
38.6503%
AI-ism word frequency
Target: <1% AI-ism words (140 tracked)
wordCount
1467
totalAiIsms
9
found
0
word
"flickered"
count
1
1
word
"flicker"
count
1
2
word
"flicked"
count
1
3
word
"velvet"
count
1
4
word
"weight"
count
1
5
word
"footsteps"
count
1
6
word
"echo"
count
1
7
word
"echoing"
count
1
8
word
"etched"
count
1
highlights
0
"flickered"
1
"flicker"
2
"flicked"
3
"velvet"
4
"weight"
5
"footsteps"
6
"echo"
7
"echoing"
8
"etched"
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
102
matches
(empty)
100.0000%
Filter word density
Target: ≤12% sentences with filter/hedge words
filterCount
2
hedgeCount
0
narrationSentences
102
filterMatches
0
"watch"
hedgeMatches
(empty)
100.0000%
Overuse of "that" (subordinate clause padding)
Target: ≤10% sentences with "that" clauses
thatCount
2
totalSentences
121
matches
0
"traced that arcane"
1
"close that rift"
100.0000%
Paragraph length variance
Target: CV ≥0.5 for paragraph word counts
totalParagraphs
31
mean
46.55
std
29.97
cv
0.644
sampleLengths
0
123
1
99
2
68
3
44
4
37
5
67
6
76
7
57
8
54
9
57
10
43
11
22
12
36
13
85
14
9
15
64
16
15
17
73
18
16
19
68
20
6
21
34
22
9
23
58
24
9
25
26
26
68
27
5
28
12
29
24
30
79
100.0000%
Passive voice overuse
Target: ≤5% passive sentences
passiveCount
1
totalSentences
102
matches
0
"was mottled"
100.0000%
Past progressive (was/were + -ing) overuse
Target: ≤10% past progressive verbs
pastProgressiveCount
0
totalVerbs
195
matches
(empty)
100.0000%
Purple prose (modifier overload)
Target: <4% adverbs, <2% -ly adverbs, no adj stacking
wordCount
1079
adjectiveStacks
0
stackExamples
(empty)
adverbCount
27
adverbRatio
0.025023169601482854
lyAdverbCount
9
lyAdverbRatio
0.008341056533827619
100.0000%
Repeated phrase echo
Target: ≤20% sentences with echoes (window: 2)
totalSentences
121
echoCount
0
echoWords
(empty)
100.0000%
Sentence length variance
Target: CV ≥0.4 for sentence word counts
totalSentences
121
mean
11.93
std
7.49
cv
0.628
sampleLengths
0
23
1
20
2
25
3
25
4
14
5
16
6
14
7
14
8
6
9
17
10
26
11
22
12
12
13
22
14
3
15
10
16
12
17
9
18
12
19
11
20
15
21
6
22
13
23
10
24
4
25
10
26
3
27
13
28
34
29
17
30
4
31
17
32
16
33
10
34
17
35
12
36
11
37
7
38
10
39
15
40
5
41
9
42
3
43
8
44
8
45
3
46
15
47
14
48
3
49
12
64.4628%
Sentence opener variety
Target: ≥60% unique sentence openers
consecutiveRepeats
2
diversityRatio
0.39669421487603307
totalSentences
121
uniqueOpeners
48
0.0000%
Dialogue tag variety (said vs. fancy)
Target: ≤30% fancy dialogue tags
totalTags
6
fancyCount
5
fancyTags
0
"Quinn said softly, standing and brushing dust from her trousers (say softly, stand brush)"
1
"Eva murmured as Quinn popped the casing open (murmur pop case)"
2
"pressed (pressed)"
3
"whispered (whisper)"
4
"Quinn said, rising (say, rise)"
85.5073%