NC Bench
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Run: 2026-02-17-01KHMQT656PD11AGTMJNP06ZC5
Run Details
Model:
Claude Opus 4.5
Test:
Bad Writing Habits
Scenario:
Thriller: chase through city streets
Duration:
58.5s
Cost:
$0.072435
Provider:
Amazon Bedrock
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 came down in sheets, turning Soho into a maze of reflected neon and pooling shadows. Detective Harlow Quinn's boots slammed against the wet pavement, each impact sending up a spray of dirty water that soaked through her trousers. Ahead of her, maybe thirty meters and pulling away, Tomás Herrera ran like a man who knew exactly where he
was going
. She'd found him at The Raven's Nest, nursing a whiskey at the bar beneath that garish green sign. He'd spotted her the moment she walked through the door—something in the way his warm brown eyes had
flicked
to the exit, the way his hand had moved instinctively to the Saint Christopher medallion at his throat. He'd bolted before she could get within ten feet, shoving past a waitress and disappearing through a back door she hadn't even noticed. Now the chase had dragged them north through the rain-slicked streets, past the shuttered shops and late-night kebab joints, past the clusters of tourists huddled under awnings and the homeless man Quinn had nearly trampled coming around a corner. Her lungs burned. Eighteen years on the force had kept her fit, but this bastard was younger, faster, and apparently terrified enough to run until his heart gave out. "Metropolitan Police!" she shouted, the words torn away by wind and rain. "Stop!" Herrera didn't even glance back. He cut left into a narrow alley, his dark curly hair plastered to his skull, and Quinn followed, her worn leather
watch
catching briefly on a protruding brick as she cornered too tight. The alley stank of rotting vegetables and old beer. A cat yowled and scattered from an overturned bin. She
was gaining
on him. His olive skin gleamed under a security light as he vaulted a low fence, and Quinn was over it three seconds later, her sharp jaw set in determination. She could hear him breathing now, ragged gasps that matched her own. Camden Town opened up around them, the market stalls skeletal and empty in the darkness. Quinn knew these streets—she'd walked this beat as a constable, back when her hair was still fully brown and her partner Morris had been alive to
watch
her back. The memory
flickered
unbidden: Morris's face in the dim light of that warehouse, the fear in his eyes as something moved in the shadows behind him— She shoved the thought away. Focus. The suspect was what mattered. Herrera ducked beneath a half-lowered security gate and disappeared into a building that looked like it had
been condemned
for years. Quinn paused at the threshold, her hand moving automatically to her hip. No weapon. She was off-duty, following up on a lead that her superintendent had explicitly told her to drop. The clique, he'd called them. Just rumors and paranoid speculation. Let it go, Quinn. She couldn't let it go. Not when every thread she pulled led back to that night three years ago. Not when Morris's death still sat in her chest like a stone. The building's interior
was gutted
, stripped down to concrete and exposed wiring. Quinn moved through it with military precision, each step placed
carefully
to avoid debris. She could hear Herrera ahead of her, his
footsteps
echoing
off the walls. He
was heading
down—she found the stairs and descended, one hand trailing along the damp wall for balance. The smell hit her first: incense and ozone, something coppery underneath. The sounds came next—voices, dozens of them, overlapping in languages she didn't recognize. And then she emerged from a narrow corridor into impossible space. The Veil Market spread out before her like something from a fever dream. It occupied what had clearly once been a Tube station, the curved walls still bearing faded advertisements for products that hadn't existed in decades. But the platform had
been transformed
into a labyrinthine bazaar, stalls and tents and makeshift structures crowding every available inch. Lanterns hung from wires strung across the ceiling, casting everything in shifting amber light. The rain was a distant memory down here; the air was thick and warm and carried scents Quinn couldn't identify. And the people—if they could all be called people—moved through the cramped spaces with the easy familiarity of regular customers. Quinn saw a woman with skin like polished obsidian examining a rack of dried herbs. A man with too many joints in his fingers haggled over a box of what looked like teeth. Something that might have been a child, if children came with pointed ears and eyes like molten gold, darted between the legs of the crowd. Quinn's breath caught in her throat. Her hand found the wall behind her, cold concrete reassuring her that she hadn't lost her mind entirely. Herrera had stopped running. He stood at the edge of the market, maybe twenty meters away, half-hidden behind a stall selling bottles filled with luminescent liquid. He
was watching
her, and for the first time she could read his expression clearly: not fear, exactly, but something more complex. Wariness. And underneath it, something that looked almost like pity. She could arrest him. March over there, grab him by his scarred forearm, drag him back to the surface and into a holding cell. Book him on suspicion of—what, exactly? Being present when the clique conducted their off-the-books business? Providing medical care to patients who didn't officially exist? Or she could turn around. Climb those stairs. Pretend she'd never found the entrance to this place. Go home to her empty flat, drink herself to sleep, and keep asking questions that nobody wanted to answer. The market swirled around her, unconcerned with her presence. A vendor called out in what might have been Arabic, or might have been something far older. Two figures in hooded cloaks brushed past her without a glance, their conversation a low murmur of syllables that
seemed to
crawl along her skin. Quinn took a step forward. And then another. She pushed into the crowd, ignoring the curious looks from faces that were almost but not quite human. The floor beneath her feet was uneven, the old platform tiles cracked and worn by countless
footsteps
. She kept her eyes fixed on Herrera, who hadn't moved from his position near the glowing bottles. "Detective." His voice was softer than she'd expected,
lightly
accented. He didn't
try to
run again. "You shouldn't be here." "Neither should you." She stopped an arm's length away, close enough to see the scar that ran along his left forearm, a ridge of pale tissue against his olive skin. "You're going to answer some questions." "Here?" A faint, humorless smile. "These people don't take kindly to police." "I'm not police right now. I'm off-duty." "Then what are you?" The question hung between them. Behind Quinn, she could hear the crowd shifting, murmuring. She felt eyes on her back—too many eyes, some of them not positioned where eyes should be. "I'm someone looking for answers," she said. "About the clique. About what they do, who they protect." She paused. "About what happened to my partner three years ago." Something changed in Herrera's expression. The pity was still there, but now it
was mixed
with something else—recognition, maybe, or resignation. "Morris," he said quietly. "The warehouse case." Quinn's heart stuttered. She hadn't mentioned Morris's name. She hadn't mentioned any names. "You know what happened to him." "I know..." Herrera exhaled
slowly
, his fingers finding his Saint Christopher medallion again. "I know it wasn't what the official report said. And I know that if you keep asking questions, you're going to find answers that you can't un-learn." The market noise
seemed to
recede, leaving them in a bubble of relative silence. Quinn studied the young man's face—the deep brown eyes, the lines of tension around his mouth. He looked tired. He looked like someone who'd seen too much. "I was a paramedic once," he continued. "NHS. I helped people. And then one night I was called to a scene, and I saw something I couldn't explain. Someone who should have been dead, who had injuries that couldn't exist, who healed right in front of me while I was trying to administer treatment." He shook his head. "I reported it. Filed the paperwork. And a week later, I was out. License revoked. Career over." "So you came here." Quinn gestured at the market around them. "To this." "I came here because people still needed help. Because there's an entire world that exists alongside yours, Detective, and they don't have access to hospitals or clinics or anyone who understands what they are." Herrera's voice hardened. "The clique isn't what you think. They're not criminals. They're protectors. And sometimes protection means operating outside the law." Quinn opened her mouth to respond—and then stopped, because something was wrong. The crowd around them had gone quiet. The vendors had stopped calling out. Even the ambient sounds of the market—the haggling, the
footsteps
, the clink of commerce—had faded to silence. Everyone
was looking
at her. Quinn turned
slowly
, her police instincts screaming. The faces around her weren't hostile, not yet, but they were
watch
ful. Assessing. She saw vendors reaching beneath their stalls, customers stepping back from the aisles, making room. "She doesn't have a bone token," someone said, their voice carrying in the sudden stillness. "She shouldn't be able to enter." "Detective." Herrera's hand closed around her elbow, his grip urgent. "We need to leave. Now." "I'm not done—" "You will be, if you don't move." He was already pulling her toward a side passage, a narrow gap between two stalls that she hadn't noticed before. "The Market has rules. You've broken them just by being here. And the people who enforce those rules don't negotiate." Quinn's training warred with her instinct. Every fiber of her
being screamed
to stand her ground, flash her badge, assert authority. But her badge meant nothing here. Her authority was worth less than the dirty water pooling in the gutters above. She let Herrera lead her into the passage. They emerged into another corridor, this one older and darker than the first. Quinn could hear sounds of pursuit behind them—not
footsteps
, exactly, but something that might have been
footsteps
if feet came in configurations she didn't want to imagine. "There's an exit ahead," Herrera said, not slowing. "It comes out near the canal. When we get there, don't look back. Don't stop. Just run." "And then?" "And then you go home, Detective. You forget you ever saw this place." His brown eyes met hers in the darkness. "Or you don't. And if you don't, you find me at the Nest next week. Same time." He pressed something into her palm—small, smooth, warm from his body heat. "That's a token. It'll get you back in when the Market moves." "Why are you helping me?" "Because Morris was a good man." Herrera's jaw tightened. "And because whatever killed him is still out there. And you're the first person in three years who seems to care enough to find out what." They burst out of the passage into cold night air, the rain still falling, the canal stretching out before them like a ribbon of black
silk
. Quinn's lungs burned as she ran, her boots splashing through puddles, and behind her the sounds of pursuit faded into the urban noise of the city. When she finally stopped, gasping, beneath a railway bridge, Herrera
was gone
. But the bone token was still in her hand, smooth and ancient and humming with possibilities she didn't understand. Quinn looked down at it, then up at the rain-soaked sky. Next week, she thought. Same time. She began the long walk home.
created_at
"2026-02-17T02:46:31.007862+00:00"
2/17/2026, 2:46:31 AM
model
"anthropic/claude-4.5-opus-20251124"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1740
moderation_latency
134
generation_time
58348
tokens_prompt
914
tokens_completion
3003
native_tokens_prompt
917
native_tokens_completion
2714
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
0.072435
router
(null)
provider_responses
0
id
"ba6b60f1-f1c3-4583-a586-a01c795b40c3"
status
200
is_byok
false
latency
1739
endpoint_id
"de32581c-2e11-4f54-8d29-e8a6e19d3038"
provider_name
"Amazon Bedrock"
model_permaslug
"anthropic/claude-4.5-opus-20251124"
api_type
"completions"
id
"gen-1771296331-3kUdOlkJHL59MUmjzS58"
upstream_id
"ba6b60f1-f1c3-4583-a586-a01c795b40c3"
total_cost
0.072435
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Amazon Bedrock"
Evaluation details
Result
Evaluator
Details
Meta Data
85.7143%
Adverbs in dialogue tags
Target: ≤10% dialogue tags with adverbs
totalTags
7
adverbTagCount
1
adverbTags
0
"he said quietly [quietly]"
79.6334%
AI-ism adverb frequency
Target: <1% AI-ism adverbs (57 tracked)
wordCount
1964
totalAiIsmAdverbs
4
found
0
adverb
"carefully"
count
1
1
adverb
"lightly"
count
1
2
adverb
"slowly"
count
2
highlights
0
"carefully"
1
"lightly"
2
"slowly"
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)
54.1752%
AI-ism word frequency
Target: <1% AI-ism words (140 tracked)
wordCount
1964
totalAiIsms
9
found
0
word
"flickered"
count
1
1
word
"flicked"
count
1
2
word
"silk"
count
1
3
word
"footsteps"
count
5
4
word
"echoing"
count
1
highlights
0
"flickered"
1
"flicked"
2
"silk"
3
"footsteps"
4
"echoing"
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
128
matches
(empty)
100.0000%
Filter word density
Target: ≤12% sentences with filter/hedge words
filterCount
1
hedgeCount
3
narrationSentences
128
filterMatches
0
"watch"
hedgeMatches
0
"seemed to"
1
"try to"
100.0000%
Overuse of "that" (subordinate clause padding)
Target: ≤10% sentences with "that" clauses
thatCount
0
totalSentences
150
matches
(empty)
100.0000%
Paragraph length variance
Target: CV ≥0.5 for paragraph word counts
totalParagraphs
61
mean
31.8
std
23.05
cv
0.725
sampleLengths
0
62
1
78
2
68
3
13
4
56
5
45
6
70
7
11
8
66
9
31
10
57
11
35
12
13
13
78
14
78
15
24
16
58
17
48
18
36
19
51
20
5
21
3
22
52
23
20
24
36
25
12
26
7
27
4
28
31
29
28
30
21
31
7
32
13
33
6
34
40
35
41
36
75
37
13
38
56
39
12
40
30
41
5
42
35
43
21
44
15
45
3
46
47
47
41
48
8
49
40
100.0000%
Passive voice overuse
Target: ≤5% passive sentences
passiveCount
6
totalSentences
128
matches
0
"been condemned"
1
"was gutted"
2
"been transformed"
3
"was mixed"
4
"being screamed"
5
"was gone"
100.0000%
Past progressive (was/were + -ing) overuse
Target: ≤10% past progressive verbs
pastProgressiveCount
5
totalVerbs
276
matches
0
"was going"
1
"was gaining"
2
"was heading"
3
"was watching"
4
"was looking"
100.0000%
Purple prose (modifier overload)
Target: <4% adverbs, <2% -ly adverbs, no adj stacking
wordCount
1586
adjectiveStacks
0
stackExamples
(empty)
adverbCount
63
adverbRatio
0.03972257250945776
lyAdverbCount
22
lyAdverbRatio
0.013871374527112233
100.0000%
Repeated phrase echo
Target: ≤20% sentences with echoes (window: 2)
totalSentences
150
echoCount
0
echoWords
(empty)
100.0000%
Sentence length variance
Target: CV ≥0.4 for sentence word counts
totalSentences
150
mean
12.93
std
9.01
cv
0.697
sampleLengths
0
17
1
23
2
22
3
18
4
37
5
23
6
39
7
3
8
26
9
12
10
1
11
5
12
33
13
9
14
9
15
5
16
28
17
12
18
15
19
29
20
26
21
5
22
1
23
5
24
21
25
12
26
2
27
17
28
5
29
5
30
4
31
5
32
14
33
12
34
12
35
14
36
13
37
18
38
11
39
13
40
11
41
13
42
24
43
20
44
14
45
20
46
20
47
15
48
18
49
25
58.6667%
Sentence opener variety
Target: ≥60% unique sentence openers
consecutiveRepeats
12
diversityRatio
0.4
totalSentences
150
uniqueOpeners
60
0.0000%
Dialogue tag variety (said vs. fancy)
Target: ≤30% fancy dialogue tags
totalTags
7
fancyCount
6
fancyTags
0
"shouted (shout)"
1
"he said quietly (say quietly)"
2
"he continued (continue)"
3
"someone said, their voice carrying in the sudden stillness (say, carry)"
4
"Herrera said, not slowing (say, does not slow)"
5
"pressed (pressed)"
86.9523%