NC Bench
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Run: 2026-02-17-01KHMMPZ206D30QD98ZP7FQZB4
Run Details
Model:
Claude 3.7 Sonnet
Test:
Bad Writing Habits
Scenario:
Thriller: chase through city streets
Duration:
44.2s
Cost:
$0.036621
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
Rain pummeled the streets of Soho, water sluicing down gutters already clogged with autumn leaves. Quinn pushed her way through the crowd outside The Raven's Nest, her police ID held high like a talisman. "Move," she barked, shouldering past a group of students huddled beneath a single umbrella. The green neon sign above the entrance buzzed and
flickered
, casting an eerie glow across the wet pavement. Quinn had
watch
ed her suspect enter the bar twenty minutes ago. She'd planned to wait him out, but something had spooked him. Now he was on the move again, slipping out the rear exit like smoke through fingers. Quinn's shoes slapped against the wet concrete as she rounded the corner into the alley behind the bar. Her breath came in controlled bursts, the rhythm of someone who knew how to pace herself. Eighteen years on the force had taught her that much. The rain plastered her salt-and-pepper hair to her scalp, but she barely noticed the discomfort. Focus was everything. The alley opened onto a side street. She caught a glimpse of her target—male, six feet, black hoodie—ducking into the tube station across the road. Quinn swore under her breath and broke into a sprint, dodging a taxi that blared its horn as she darted across the street. Inside the station, she flashed her badge at a startled attendant. "Police. Man in a black hoodie. Which way?" The attendant pointed toward the Northern line. Quinn took the stairs two at a time, her hand instinctively hovering near her concealed weapon. The platform was nearly empty—just a few late-night travelers waiting for the last train. No sign of her suspect. She scanned the platform methodically, left to right, the way they'd taught her at Hendon. Nothing. But she'd seen him come this way. The hairs on the back of her neck stood up. Something wasn't right. That's when she spotted it—a maintenance door at the far end of the platform,
slightly
ajar. Quinn approached
cautiously
, using the sparse crowd as cover. As she neared the door, she noticed the lock had
been forced
. Amateur work, but effective. Quinn drew her phone and sent a quick text to the station, requesting backup at Camden tube station. She
wasn't making
the same mistake again. Three years ago, DS Morris had followed a lead alone. They'd found his body two days later with no explanation for the bizarre burns that covered ninety percent of his body. The official report cited "electrical malfunction," but Quinn had seen electrical burns before. These were different. She pushed the thought aside. The text delivered, she slipped through the maintenance door, closing it behind her. The service tunnel beyond was dimly lit by widely spaced emergency bulbs. The air smelled of damp concrete and something else—something sweet and unfamiliar, like incense. Her quarry's
footsteps
echoed
ahead, moving at a measured pace now. He thought he'd lost her. Quinn kept her own steps light, maintaining distance. Better to see where he
was going
than to spook him into running again. The tunnel sloped downward, taking them deeper beneath the city. Quinn checked her
watch
—the worn leather band dark with rainwater—and noted the time. Backup would be at least ten minutes. She should wait, but instinct told her this was important. This could be the break she'd been looking for. The suspect had
been seen
three times near locations where people had disappeared—people whose cases had been hastily classified as runaways or suicides. But Quinn had seen the patterns others missed. Each disappearance had occurred during the full moon. Each victim had been last seen near locations frequented by a group she'd been
watch
ing—a clique of people who
seemed to
move through London like ghosts, leaving barely a trace. Ahead, the tunnel widened into what looked like an abandoned platform—one of London's ghost stations, closed decades ago and forgotten by most. But this place wasn't abandoned. Soft light spilled from somewhere up ahead, and the murmur of voices carried through the still air. Quinn slowed her pace, keeping to the shadows. Her suspect had stopped at what
appeared to
be a dead end, his hand resting on the wall. He pulled something from his pocket—small and white,
glinting
in the low light—and pressed it against a specific brick. The wall slid aside without a sound, revealing a passage beyond. Quinn blinked. That wasn't possible. Yet she'd seen it with her own eyes. The wall had moved. The suspect slipped through the opening, which
began to
close behind him. Quinn had seconds to decide: wait for backup or follow him into whatever lay beyond. Her training said wait. The memory of Morris's burned body said wait. But the answers she'd sought for three years might be on the other side of that wall. Quinn lunged forward, catching the edge of the opening just before it closed
completely
. The stone was cold against her palm as she pried it open just enough to slip through. The passage beyond was narrow, forcing her to turn sideways to
navigate
it. The sweet smell was stronger here, mingled with other scents—cooking food, exotic spices, and something acrid that made her eyes water. The passage opened abruptly into a vast space that made Quinn freeze in disbelief. She
was standing
on a balcony overlooking what had once been a tube station platform, but was now transformed into a bustling market. Stalls lined every available space, their surfaces covered with wares that glinted, glowed, and in some cases, moved of their own accord. People—if they were people—moved through the crowd in a
kaleidoscope
of shapes and sizes. Quinn instinctively stepped back into the shadows, her mind struggling to process what she
was seeing
. This couldn't be real. Yet there was her suspect, moving confidently through the crowd toward a stall draped with dark fabric. "First time at the Veil Market?" Quinn spun, her hand reaching for her weapon. A man stood behind her, olive-skinned with warm brown eyes that crinkled at the corners when he smiled. He raised his hands placatingly, showing he was unarmed. A Saint Christopher medallion gleamed at his throat. "Whoa, easy," he said, his accent a musical blend of Spanish and London English. "I'm not looking for trouble." Quinn didn't relax her stance. "Who are you?" "Tomás Herrera. Though most people here call me Tommy." He nodded toward her concealed weapon. "That won't do you much good down here, Detective." Quinn's
eyes narrowed
. "How do you know I'm a detective?" "The way you stand. The way you assess everything. And the fact that you followed Rook through the rain for six blocks." Herrera smiled, but his eyes remained cautious. "You're out of your jurisdiction, Detective... Quinn, is it?" The fact that he knew her name
sent a chill down
Quinn's spine. "What is this place?" "The Veil Market. It moves around, but tonight it's beneath Camden." Herrera's gaze
flickered
to something behind Quinn. "And you
really
shouldn't be here without an invitation. Or at least a bone token." Quinn glanced over her shoulder. Her suspect—Rook, Herrera had called him—was now engaged in conversation with the proprietor of the fabric-draped stall. "That man is connected to several disappearances." "Possibly," Herrera conceded. "But charging through the Market accusing people isn't going to end well for you. Especially not tonight." "What's special about tonight?" "Full moon." Herrera's hand unconsciously touched the scar that ran along his left forearm. "The Market's busiest night. And its most dangerous." Quinn's gaze swept the scene below them again. Now that the initial shock was fading, she
was cataloging
details with professional precision. Most of the vendors appeared human, but some... didn't. And the wares they sold—bottles containing swirling mists, jewelry that
seemed to
change shape, creatures that resembled nothing she'd ever seen in any zoology textbook. "What
happened to
your partner, Detective?" Herrera asked quietly. "The one who disappeared three years ago?" Quinn's attention snapped back to him. "How do you—" "I was there. I tried to help him, but by the time I reached him..." Herrera shook his head. "The burns were beyond my skills. And I used to be a good paramedic." Quinn felt like the ground had shifted beneath her feet. Three years of questions, of hitting walls and dead ends, and here was someone who claimed to know what
happened to
Morris. "Tell me," she said, her voice tight with control. "Not here." Herrera nodded toward a tunnel on the far side of the market. "Your suspect is about to leave through the south exit. If you still want to follow him, that's your choice. But if you want answers about your partner, come with me instead." Quinn glanced back at Rook, who was indeed concluding his business and turning toward the exit Herrera had indicated. Everything in her training told her to follow the suspect, to gather evidence methodically. But Morris deserved justice. And whatever this place was, it held answers she'd never find in police databases or witness statements. "Lead the way," Quinn said, making her decision. "But if you're wasting my time..." "I understand." Herrera's expression was solemn as he gestured toward a different passage. "This way, Detective. And try not to make eye contact with anyone. You don't have a token, and they'll know you don't belong." As Quinn followed Herrera into the crowd, she felt eyes tracking her movement. The rain-soaked world of London streets seemed impossibly distant now, as if she'd stepped through a door into another reality entirely. Perhaps she had. But one thing remained constant—her determination to find the truth. Whatever it cost her. Wherever it led.
created_at
"2026-02-17T01:52:05.484628+00:00"
2/17/2026, 1:52:05 AM
model
"anthropic/claude-3-7-sonnet-20250219"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
672
moderation_latency
(null)
generation_time
44103
tokens_prompt
914
tokens_completion
2512
native_tokens_prompt
917
native_tokens_completion
2258
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
0.036621
router
(null)
provider_responses
0
id
"msg_011orDyMZ3fEqgbSDGzVgER5"
status
200
is_byok
false
latency
672
endpoint_id
"1347c8dc-12f5-47df-8355-3ec7e80a8c67"
provider_name
"Anthropic"
model_permaslug
"anthropic/claude-3-7-sonnet-20250219"
api_type
"completions"
id
"gen-1771293080-73sjAZ5EuzbwaLhyhCrr"
upstream_id
"msg_011orDyMZ3fEqgbSDGzVgER5"
total_cost
0.036621
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
7
adverbTagCount
0
adverbTags
(empty)
75.4451%
AI-ism adverb frequency
Target: <1% AI-ism adverbs (57 tracked)
wordCount
1629
totalAiIsmAdverbs
4
found
0
adverb
"cautiously"
count
1
1
adverb
"completely"
count
1
2
adverb
"slightly"
count
1
3
adverb
"really"
count
1
highlights
0
"cautiously"
1
"completely"
2
"slightly"
3
"really"
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)
57.0289%
AI-ism word frequency
Target: <1% AI-ism words (140 tracked)
wordCount
1629
totalAiIsms
7
found
0
word
"flickered"
count
2
1
word
"glinting"
count
1
2
word
"footsteps"
count
1
3
word
"echoed"
count
1
4
word
"navigate"
count
1
5
word
"kaleidoscope"
count
1
highlights
0
"flickered"
1
"glinting"
2
"footsteps"
3
"echoed"
4
"navigate"
5
"kaleidoscope"
66.6667%
Cliche density
Target: ≤1 cliche(s) per 800-word window
totalCliches
2
maxInWindow
2
found
0
label
"eyes widened/narrowed"
count
1
1
label
"sent a shiver through"
count
1
highlights
0
"eyes narrowed"
1
"sent a chill down"
100.0000%
Emotion telling (show vs. tell)
Target: ≤3% sentences with emotion telling
emotionTells
0
narrationSentences
118
matches
(empty)
100.0000%
Filter word density
Target: ≤12% sentences with filter/hedge words
filterCount
1
hedgeCount
5
narrationSentences
118
filterMatches
0
"watch"
hedgeMatches
0
"seemed to"
1
"appeared to"
2
"began to"
3
"happened to"
100.0000%
Overuse of "that" (subordinate clause padding)
Target: ≤10% sentences with "that" clauses
thatCount
0
totalSentences
137
matches
(empty)
100.0000%
Paragraph length variance
Target: CV ≥0.5 for paragraph word counts
totalParagraphs
46
mean
34.87
std
18.85
cv
0.541
sampleLengths
0
34
1
14
2
56
3
62
4
48
5
19
6
42
7
36
8
41
9
72
10
44
11
38
12
49
13
69
14
44
15
56
16
56
17
17
18
65
19
73
20
37
21
6
22
43
23
19
24
8
25
24
26
10
27
38
28
17
29
33
30
29
31
20
32
4
33
22
34
56
35
16
36
9
37
33
38
32
39
9
40
46
41
54
42
14
43
36
44
37
45
17
100.0000%
Passive voice overuse
Target: ≤5% passive sentences
passiveCount
2
totalSentences
118
matches
0
"been forced"
1
"been seen"
100.0000%
Past progressive (was/were + -ing) overuse
Target: ≤10% past progressive verbs
pastProgressiveCount
5
totalVerbs
254
matches
0
"wasn't making"
1
"was going"
2
"was standing"
3
"was seeing"
4
"was cataloging"
100.0000%
Purple prose (modifier overload)
Target: <4% adverbs, <2% -ly adverbs, no adj stacking
wordCount
1362
adjectiveStacks
0
stackExamples
(empty)
adverbCount
44
adverbRatio
0.032305433186490456
lyAdverbCount
20
lyAdverbRatio
0.014684287812041116
100.0000%
Repeated phrase echo
Target: ≤20% sentences with echoes (window: 2)
totalSentences
137
echoCount
0
echoWords
(empty)
100.0000%
Sentence length variance
Target: CV ≥0.4 for sentence word counts
totalSentences
137
mean
11.71
std
6.41
cv
0.548
sampleLengths
0
15
1
19
2
14
3
18
4
11
5
11
6
16
7
18
8
16
9
10
10
15
11
3
12
7
13
18
14
23
15
11
16
8
17
7
18
16
19
14
20
5
21
15
22
1
23
7
24
10
25
3
26
16
27
9
28
12
29
4
30
18
31
7
32
10
33
21
34
13
35
3
36
5
37
13
38
12
39
14
40
11
41
5
42
8
43
14
44
10
45
13
46
7
47
10
48
9
49
23
59.3674%
Sentence opener variety
Target: ≥60% unique sentence openers
consecutiveRepeats
7
diversityRatio
0.38686131386861317
totalSentences
137
uniqueOpeners
53
32.1429%
Dialogue tag variety (said vs. fancy)
Target: ≤30% fancy dialogue tags
totalTags
7
fancyCount
4
fancyTags
0
"she barked, shouldering past a group of students huddled beneath a single umbrella (bark, shoulder huddle)"
1
"The official report cited but Quinn had seen electrical burns before. (cite see)"
2
"Herrera conceded (concede)"
3
"Quinn said, making her decision (say, make)"
87.6853%