NC Bench
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Run: 2026-02-17-01KHMQY7QG0WBYDJXA2397ZBSN
Run Details
Model:
Claude Opus 4.5
Test:
Bad Writing Habits
Scenario:
Mystery: examining a crime scene
Duration:
44.9s
Cost:
$0.054635
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="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 bone token felt wrong in Quinn's palm. Too light, like holding a piece of chalk that had
been hollowed
out. She'd found it in the victim's coat pocket three days ago, and it had taken her that long to learn what it was for—and longer still to find someone willing to tell her where to use it. The abandoned Tube station beneath Camden smelled of damp stone and something else, something that reminded her of the ozone tang before a lightning strike. Quinn descended the last few steps, her torch beam cutting through darkness that
seemed to
push back against the light. The platform str
etched
before her, empty save for the crime scene tape she'd ordered strung across the far end and the single figure already waiting there. Eva Kowalski stood with her back to Quinn, her worn leather satchel slung across her shoulders, her curly red hair catching the weak glow from the emergency lights that still functioned down here after all these years. The young woman
was studying
something on the ground, her round glasses pushed up on her nose. "You're early," Quinn said, and her voice
echoed
strangely off the tiled walls. The acoustics were wrong. Sound should have carried further, bounced more. Instead, her words fell flat, absorbed by something she couldn't see. Eva turned, tucking a strand of hair behind her left ear. "I've been here for an hour. The market moves e
very
full moon, Detective. We've got three days before this whole place shifts and takes whatever evidence is left with it." Quinn crossed the platform, her
footsteps
precise, measured. Eighteen years on the force had taught her how to read a crime scene like text, but the words here
were written
in a language she was only beginning to learn. The body had been removed two nights ago—a John Doe, mid-forties, cause of death listed as cardiac arrest despite the fact that his heart had been found six feet from his chest, still beating when the first responder arrived. That detail hadn't made it into the official report. Quinn had made sure of it. "Walk me through what you see," she said. Eva crouched near a scorch mark on the platform's edge, pulling a small brass compass from her satchel. Quinn recognized it—she'd seen drawings of similar objects in the restricted files Eva had shown her, files that weren't supposed to exist in the British Museum's archives. The compass's face
was etched
with symbols that
seemed to
shift when Quinn
tried to
focus on them, and its casing bore a patina of verdigris that spoke to age far beyond what brass should accumulate. "The Veil Compass is reading active," Eva said, her voice dropping to
barely above a whisper
. "There was a rift here. Recently. The needle's still spinning, which means the energy hasn't fully dissipated." Quinn knelt beside her, studying the scorch mark. It wasn't char, she realized. The blackening wasn't on the surface—it was in the tile itself, as if the ceramic had
been stained
from within. She pulled a penlight from her jacket pocket and angled it across the mark. At a certain slant, the black
seemed to
shimmer with an iridescent quality, like oil on water. "The official theory
is that our
victim was killed during a deal gone wrong," Quinn said. "Underground market, illegal goods, someone decided he wasn't worth the trouble of paying." "That's not what happened." "I know." Quinn straightened, scanning the platform. The market stalls
were gone
now—packed up and vanished into whatever shadow roads the Veil Market's vendors used to transport their wares. But she could see the traces they'd left behind: scuff marks in the dust, a dropped coin she'd already bagged as evidence, the faint chalk lines that had marked out vendor territories. "His heart was removed without a single cut to his chest. No incision, no trauma to the surrounding tissue. The pathologist nearly quit on the spot." Eva stood, the compass still in her hand. Its needle had stopped spinning, pointing now toward the tunnel's dark mouth at the platform's north end. "There are creatures that can do that. Reach inside you and take what they want without breaking the skin. The old texts call them Hollow-Handed. They're servants, usually. Someone else's weapon." "Someone at the market?" "Or someone who wanted something from the market. Something specific enough to kill for." Quinn walked the perimeter of the scorch mark, counting steps. Twelve feet in diameter. Almost perfect circle, save for an irregular bulge on the eastern edge. She pulled out her notebook—leather-bound, worn soft from years of use—and sk
etched
the shape. "The bulge," she said. "What does that tell you?" Eva crossed to examine it, her satchel swinging against her hip. The books inside rustled with the movement, pages shifting against pages. She was quiet for a long moment, her green eyes tracing the mark's edge. "Interrupted," she finally said. "The rift was interrupted. Someone—or something—
tried to
close it before it fully formed. See how the edge here is jagged? A clean rift leaves smooth borders. This one was fought." Quinn thought about that. Thought about the victim's face, frozen in an expression she'd first read as terror and now reconsidered. Not terror. Determination. His hands had
been clenched
when they'd found him, fingernails torn and bloody, but there had been nothing under them. Nothing physical, at least. "He wasn't the target," Quinn said
slowly
, the pieces beginning to align. "He was trying to stop something." "Or protect something." Eva pointed to a second scorch mark, smaller, partially hidden beneath a collapsed advertising board. Quinn hadn't noticed it during her initial sweep. She moved toward it, her worn leather
watch
catching on her sleeve as she knelt to examine the mark. This one was different. The same internal staining, the same iridescent quality, but the shape was wrong. Not a circle. A crescent, curved like a cupped hand. "A shield mark," Eva said from behind her. "Someone was standing here, protected by something when the rift opened. Our victim took the hit meant for them." Quinn's jaw tightened. Three years ago, DS Morris had died in a warehouse fire that had burned cold—flames that froze e
very
thing they touched, that left her partner's body unmarked but
utterly
, impossibly dead. She'd
been told
it was a gas leak. A chemical reaction. Something that made sense in a world where sense still applied. She'd known it was a lie. She just hadn't known what the truth looked like. "Who would he have been protecting?" she asked. Eva was already moving, following some pattern Quinn couldn't see, her compass held out before her like a dowsing rod. "The market deals in information as much as goods. Someone here knew something worth killing over. Worth dying over." She stopped near the tunnel mouth, the compass needle now pointing directly into the darkness. "The rift didn't just open randomly. It was aimed. Targeted. Whoever our victim died protecting, they
went that way
." Quinn stood, brushing dust from her knees with military precision. The tunnel str
etched
before her, its darkness absolute beyond the reach of the emergency lights. Her torch
suddenly
felt inadequate. A child's toy against whatever waited in that black. "The official investigation ends here," she said. "Cardiac arrest, suspicious circumstances, case pending further evidence." She met Eva's eyes, seeing the same calculation there, the same weighing of risk against necessity. "Unofficially?" Eva smiled, but there was no humor in it. Just a grim recognition between two people who had seen behind the curtain and couldn't pretend the world was still what they'd believed it to be. "Unofficially, Detective Quinn, I think you're about to solve a murder that never officially happened, committed by something that officially doesn't exist, to protect someone who officially wasn't here." She pulled a second bone token from her satchel and pressed it into Quinn's hand. "You'll need this. Where we're going, cash won't spend." Quinn looked at the token. Same hollow lightness, same chalk-white surface, but this one was marked with a symbol she didn't recognize—a spiral that
seemed to
turn inward the longer she looked at it. "What is it?" "Payment. For the kind of answers you're looking for." Eva shouldered her satchel, adjusting the strap. "The Veil Market moves e
very
full moon, but the people who run it have longer memories than that. Three days isn't much time, but it's enough to find out what was worth a man's life." Quinn pocketed the token and checked her
watch
. Half past eleven. The darkness in the tunnel
seemed to
pulse with something almost like a heartbeat. "Then let's not waste it." They walked into the black together, and behind them, the scorch mark on the platform floor began,
very
slowly
, to glow.
created_at
"2026-02-17T02:48:30.241283+00:00"
2/17/2026, 2:48:30 AM
model
"anthropic/claude-4.5-opus-20251124"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1657
moderation_latency
222
generation_time
44629
tokens_prompt
923
tokens_completion
2272
native_tokens_prompt
937
native_tokens_completion
1998
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
0.054635
router
(null)
provider_responses
0
id
"c9cbadbe-2457-45cc-bfd7-cc1960ea0c9a"
status
200
is_byok
false
latency
1657
endpoint_id
"de32581c-2e11-4f54-8d29-e8a6e19d3038"
provider_name
"Amazon Bedrock"
model_permaslug
"anthropic/claude-4.5-opus-20251124"
api_type
"completions"
id
"gen-1771296464-O2TGjBYgH0QFAfbU54gk"
upstream_id
"c9cbadbe-2457-45cc-bfd7-cc1960ea0c9a"
total_cost
0.054635
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Amazon Bedrock"
Evaluation details
Result
Evaluator
Details
Meta Data
0.0000%
Adverbs in dialogue tags
Target: ≤10% dialogue tags with adverbs
totalTags
10
adverbTagCount
4
adverbTags
0
"Quinn said, and her voice echoed strangely off the tiled walls [strangely]"
1
"Eva said, her voice dropping to barely above a whisper [barely]"
2
"she finally said [finally]"
3
"Quinn said slowly, the pieces beginning to align [slowly]"
59.4595%
AI-ism adverb frequency
Target: <1% AI-ism adverbs (57 tracked)
wordCount
1480
totalAiIsmAdverbs
6
found
0
adverb
"slowly"
count
2
1
adverb
"suddenly"
count
1
2
adverb
"utterly"
count
1
3
adverb
"barely above a whisper"
count
1
4
adverb
"very"
count
1
highlights
0
"slowly"
1
"suddenly"
2
"utterly"
3
"barely above a whisper"
4
"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)
79.7297%
AI-ism word frequency
Target: <1% AI-ism words (140 tracked)
wordCount
1480
totalAiIsms
3
found
0
word
"footsteps"
count
1
1
word
"echoed"
count
1
2
word
"etched"
count
1
highlights
0
"footsteps"
1
"echoed"
2
"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
84
matches
(empty)
100.0000%
Filter word density
Target: ≤12% sentences with filter/hedge words
filterCount
2
hedgeCount
6
narrationSentences
84
filterMatches
0
"watch"
hedgeMatches
0
"seemed to"
1
"tried to"
100.0000%
Overuse of "that" (subordinate clause padding)
Target: ≤10% sentences with "that" clauses
thatCount
2
totalSentences
102
matches
0
"is that our"
1
"went that way"
100.0000%
Paragraph length variance
Target: CV ≥0.5 for paragraph word counts
totalParagraphs
40
mean
36.63
std
22.8
cv
0.622
sampleLengths
0
58
1
71
2
54
3
35
4
41
5
78
6
15
7
8
8
81
9
33
10
64
11
29
12
4
13
87
14
56
15
4
16
14
17
40
18
9
19
36
20
34
21
48
22
18
23
45
24
27
25
27
26
55
27
15
28
8
29
73
30
39
31
32
32
35
33
53
34
34
35
3
36
51
37
25
38
5
39
21
69.8413%
Passive voice overuse
Target: ≤5% passive sentences
passiveCount
8
totalSentences
84
matches
0
"been hollowed"
1
"were written"
2
"been removed been found"
3
"was etched"
4
"been stained"
5
"were gone"
6
"been clenched"
7
"been told"
100.0000%
Past progressive (was/were + -ing) overuse
Target: ≤10% past progressive verbs
pastProgressiveCount
1
totalVerbs
197
matches
0
"was studying"
94.0000%
Purple prose (modifier overload)
Target: <4% adverbs, <2% -ly adverbs, no adj stacking
wordCount
1087
adjectiveStacks
1
stackExamples
0
"same chalk-white surface,"
adverbCount
31
adverbRatio
0.028518859245630176
lyAdverbCount
12
lyAdverbRatio
0.011039558417663294
100.0000%
Repeated phrase echo
Target: ≤20% sentences with echoes (window: 2)
totalSentences
102
echoCount
0
echoWords
(empty)
100.0000%
Sentence length variance
Target: CV ≥0.4 for sentence word counts
totalSentences
102
mean
14.36
std
10.09
cv
0.703
sampleLengths
0
8
1
13
2
37
3
25
4
20
5
26
6
37
7
17
8
13
9
4
10
7
11
11
12
11
13
30
14
8
15
31
16
39
17
9
18
6
19
8
20
18
21
27
22
36
23
16
24
17
25
8
26
5
27
20
28
14
29
17
30
16
31
13
32
4
33
7
34
22
35
32
36
26
37
8
38
17
39
31
40
4
41
14
42
10
43
4
44
12
45
14
46
4
47
5
48
11
49
11
66.9935%
Sentence opener variety
Target: ≥60% unique sentence openers
consecutiveRepeats
5
diversityRatio
0.43137254901960786
totalSentences
102
uniqueOpeners
44
75.0000%
Dialogue tag variety (said vs. fancy)
Target: ≤30% fancy dialogue tags
totalTags
10
fancyCount
4
fancyTags
0
"Quinn said, and her voice echoed strangely off the tiled walls (say, echo strangely tiled)"
1
"Eva said, her voice dropping to barely above a whisper (say, drop)"
2
"she finally said (finally say)"
3
"Quinn said slowly, the pieces beginning to align (say slowly, align)"
85.0014%