NC Bench
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Run: 2026-02-17-01KHMQJ1VWA85F0RGBWZ1GR3M4
Run Details
Model:
Claude Opus 4.6
Test:
Bad Writing Habits
Scenario:
Horror: alone in an eerie place at night
Duration:
1m 19s
Cost:
$0.077720
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="4412" name="Aurora Carter" aliases="Rory, Laila, Aurora, Carter, Malphora" pronouns="she/her" species="Human" storyRole="Protagonist"> <eyeColor>bright blue</eyeColor> <hair>straight shoulder-length black</hair> <height>5'6"</height> <age>25</age> <scar>small crescent-shaped scar on her left wrist from a childhood accident</scar> <description>Aurora, referred to by her friends as Rory, is cool-headed, intelligent, and known for quick out-of-the-box thinking.</description> <backstory>Born in Cardiff to an Irish barrister father (Brendan Carter) and Welsh teacher mother (Jennifer Carter née Ellis), Rory reluctantly pursued Pre-Law at Cardiff University. She fled to London at the behest of her childhood friend Eva after leaving an abusive ex named Evan. By day, Rory works part-time as a delivery person for Yu-Fei Cheung's Golden Empress restaurant. She lives in a flat above Silas' bar.</backstory> </character> <location id="861" name="The Fae Grove" aliases="Isolde's grove, Richmond grove, the Grove" realm="Earth (Fae-touched)"> <parkLocation>Richmond Park</parkLocation> <standingStones>ancient oak standing stones mark the boundary</standingStones> <timeBehavior>time moves differently — an hour inside can be minutes or days outside</timeBehavior> <flora>wildflowers bloom year-round</flora> <description>A hidden clearing that exists in a pocket between Earth and the Fae realm.</description> </location> <item id="2001" name="Heartstone Pendant" aliases="the pendant, Heartstone" type="Artifact" origin="Dymas"> <gemstoneColor>deep crimson</gemstoneColor> <chainMaterial>silver chain</chainMaterial> <size>roughly the size of a thumbnail</size> <behavior>pulses faintly with warmth when near a Hel portal</behavior> <glow>faint inner glow</glow> <description>Given to Aurora by an unknown benefactor.</description> </item> </codex> Write a fully fleshed out scene of at least 1000 words in the horror genre. A character is alone in a strange, isolated place at night. They came here for a reason, but something feels off from the moment they arrive. The wrongness builds slowly — sounds that shouldn't be there, things that move at the edge of vision, a growing certainty that they are not alone. Build tension through restraint, not through gore. Use the codex entries above as your world reference for the character and setting. Only include the prose of the scene without any markdown or commentary.
Model response
Messages
Meta
AI
Rory hadn't meant to come at night. She'd left the flat above Silas's bar a full two hours before sunset, her jacket zipped to her throat against the October air, the pendant warm against her collarbone where it hung on its thin silver chain. The Tube to Richmond had taken forty minutes, and she'd walked the rest, cutting through the park's eastern gate just as the last daylight
was bleeding
out of the sky in watercolour streaks of salmon and bruise-purple. All
perfectly
timed. She should have had an hour of dusk at least. But when she stepped through the ancient oaks—those standing stones that only
look
ed like trees if you didn't know what you
were looking
at—the light simply wasn't there anymore. As if something had swallowed it. As if the grove had been waiting for dark. She stopped at the edge of the clearing and let her eyes adjust. The Fae Grove
look
ed different at night, which shouldn't have surprised her but did. She'd been here twice before, both times in watery afternoon sunlight that made the wildflowers glow like stained glass. Now the flowers were still blooming—they always bloomed, e
very
season, e
very
hour—but in the dark they
look
ed wrong. Too vivid. The bluebells were the colour of deep veins beneath skin. The foxgloves stood in clusters like hooded figures, pale and still and watching nothing. Rory exhaled through her nose and stepped forward. She'd come because the pendant had been pulsing all day. Not the faint, polite warmth it gave off near anything faintly touched by the other side—this had been insistent, a steady heartbeat rhythm against her sternum that had made her hands shake while she
was trying
to balance three containers of kung pao chicken on her forearm during the lunch rush. Yu-Fei had noticed. Yu-Fei always noticed. She'd caught Rory's eye across the kitchen pass and raised one sharp eyebrow, and Rory had mouthed later and kept moving, but the pulse hadn't stopped. If anything it had deepened, grown warmer, until the Heartstone felt less like a pendant and more like a coal someone had pressed into the hollow of her throat. So here she was. Alone, at night, in a pocket between worlds where time moved like water through a cracked cup—unpredictably, without permission. She pulled her phone from her jacket pocket. No signal, which was expected. The time read 6:47 PM, which might mean nothing at all once she walked deeper in. The grass was wet. She could feel it through the canvas of her trainers, soaking into her socks with each step. There'd been no rain. She was sure of that—she'd checked the forecast obsessively before leaving, a habit left over from deli
very
shifts, from needing to know whether she'd be cycling through drizzle or downpour. No rain in London today. No rain forecast until Thursday. But the grass
was drenched
, and when she
look
ed down, her footprints filled
slowly
with water that caught no light at all. Just dark, flat pools in the shape of her steps. She was halfway across the clearing when she heard it. Not a sound, exactly. Or rather, it was the specific absence of sound where sound had been. The grove had a ambient noise when you stood still long enough to hear it—a layered hum of insect song and wind through the oak canopy and something deeper, almost tonal, that she'd always assumed was the
resonance
of the place itself, the vibration of a space that existed in two worlds at once. It was there when she arrived. It was there as she walked. And then, mid-step, it cut out. All of it. Like someone had hit mute on the clearing itself. Rory stopped walking. The silence was physical. It pressed against her eardrums, thick and cottony, and she could hear her own pulse and the wet pull of her breath and absolutely nothing else. The oaks around the clearing's edge did not move. The foxgloves did not sway. Even the grass beneath her feet
seemed to
have stopped existing in any tactile way—she couldn't feel the dampness anymore, couldn't feel anything except the pendant burning against her chest with a heat that was no longer comfortable. She wrapped her fingers around it through her jacket. The Heartstone pulsed once, hard, like a second heart kicking in her fist. Something moved. It was at the far edge of the clearing, just past the line where the wildflowers thinned and the standing oaks began. She didn't see it directly—she saw the space where it had been, a brief displacement of shadow, as if the dark between two trees had shifted an inch to the left and then corrected itself. It lasted less than a second. It left no trace. And Rory stood
very
still, her hand around the pendant, her feet planted in the wet grass, and told herself it was nothing. She didn't believe herself. The silence held. She counted to ten,
slowly
, the way her mother had taught her to do when the world felt too fast or too loud—count to ten, cariad, and e
very
thing slows down. At seven, the ambient hum returned. Not gradually, not fading back in, but all at once, as if whatever had caused the silence had simply decided to stop. Rory turned in a slow circle. The clearing
look
ed the same. The flowers, the oaks, the dark canopy above with its thin lace of cloud-occluded starlight. Nothing had changed. She un
clenched her jaw
and realized her teeth had
been pressed
together so hard her molars ached. She needed to keep moving. She'd come here for a reason—the pendant
was reacting
to something, and if there was a Hel portal forming in the grove, she needed to find it before it opened fully. Before something came through that made the shadow between the trees
look
like a pleasant evening stroll. She walked toward the centre of the clearing, where a flat stone sat half-buried in the earth like a surfacing whale. She'd sat on it before, during those daylight visits, and felt the grove's energy focus there like light through a lens. Now, as she approached, the pendant's pulse quickened. Faster. Warmer. The crimson gemstone
was glowing
through the fabric of her jacket, a faint ruby light that she could see when she
look
ed down. She knelt beside the stone and placed her palm flat against its surface. Cold. Colder than the October air should allow, colder than stone had any right to be. The kind of cold that burned, that made the small crescent-shaped scar on her left wrist ache with a phantom pain she hadn't felt in years. She jerked her hand back and pressed it against her thigh, flexing her fingers. There was a smell now. She hadn't noticed when it started—it was the kind of smell that crept in at the edges, that made you
think
you'd always been smelling it. Iron and wet soil and something under that, something sweet and rotting, like fruit left too long in a warm room. It
was coming
from the stone, or from beneath it, or from e
very
where. The second movement came from behind her. She didn't turn around. E
very
instinct in her body screamed at her to spin, to
look
, to confront whatever was there—but a deeper instinct, something older and less rational, told her that turning around was exactly what it wanted. That there was a difference between being aware of something's presence and acknowledging it. That acknowledgment, in a place like this, might constitute invitation. She kept her eyes on the stone. In her peripheral vision, at the leftmost edge of what her eyes could catch without turning her head, something stood among the foxgloves. It was tall—taller than the flowers, taller than she was, though it was hard to judge from this angle and in this light. It had no clear shape. It was more of a density, a thickening of the darkness that was vaguely vertical and absolutely, unmistakably watching her. The pendant scorched against her chest. She bit the inside of her cheek to keep from gasping. The sound returned—but wrong this time. The ambient hum was back, the insects and the wind and the deep tonal
resonance
, but layered over it was something that didn't belong. A breathing. Slow, rhythmic, wet. Not her breathing. The cadence was off—too slow, too deliberate, as if whatever
was making
the sound had to
think
about each breath, had to choose to inhale and then choose, separately, to exhale. As if breathing were a performance rather than a reflex. Rory's mind went
very
clear and
very
quiet, the way it did in crisis. She'd felt this before—in Eva's car driving away from Cardiff at three in the morning, in the back of the restaurant when two men had
tried to
rob the register and she'd been the only one in the shop. Her thoughts stopped scattering and locked into a single bright line of focus, and the fear was still there but it was underneath, like a river under ice. She had to leave the clearing. She had to stand up, walk calmly back toward the standing oaks, and step through to Richmond Park, where the streetlights would be on and the dog walkers would be finishing their evening circuits and the world would obey its own laws. She had to do this without running, because running would be panic, and panic in a place between worlds was a door thrown open. She also knew, with the flat certainty of someone who has just realized the nature of the trap, that the standing oaks were behind her. And the thing in the foxgloves was between her and the way out. The breathing stopped. Not gradually. Not with a final exhale. It simply ceased, the way the ambient sound had ceased before—cut off, excised, as if it had never been. And in the silence that followed, Rory heard something worse. A single sound, small and precise and devastating. Her name. Not spoken. Not whispered. It was as if the word had
been pressed
into the air like a thumbprint into clay, without voice or breath or source. Rory. Two syllables, hanging in the space between the foxgloves and the stone, vibrating at a frequency she felt in her back teeth. She stood up. Her knees were wet from the grass, and her left hand was still tingling from the cold of the stone, and the pendant
was burning
so hot that she would find a mark there tomorrow, a small red oval like a brand. She did not
look
toward the foxgloves. She kept her gaze forward, past the stone, toward the far side of the clearing where the oaks curved in a rough semicircle. There was another way out. There had to be. The grove was a pocket, a fold in space, and if it had one entrance it could have others. She just had to walk. She just had to not
look
. She took a step. Behind her, from the place where the foxgloves grew in their pale hooded clusters, came the sound of something following. Not
footsteps
—something heavier and wetter, like a body
being dragged
through soaked grass. It moved when she moved and stopped when she stopped. She could feel the distance between them like a physical pressure on the back of her neck, a cold spot that intensified e
very
time she paused. She did not run. She walked, her hands balled into fists at her sides, her jaw tight, her eyes fixed on the dark line of oaks ahead. The pendant pulsed in time with her heartbeat, and the crimson light bleeding through her jacket painted the grass at her feet in shades of blood and wine. Halfway across, the flowers at her feet
began to
die. She watched it happen in real time—a bluebell six inches from her right foot curled inward, its petals darkening from vein-blue to black, its stem softening and folding like a snuffed candlewick. Then the next one. Then the next. A wave of death spreading outward from behind her in a widening arc, following her trajectory, touching e
very
bloom she'd already passed. She reached the oaks. She put her hand on the nearest one, felt the roughness of bark that was older than bark had any right to be, and pushed through the boundary with the desperate controlled calm of someone stepping off a ledge. Richmond Park slammed into her senses—streetlight, distant traffic, the bark of a dog somewhere near the car park. She staggered two steps onto the paved footpath and bent double, hands on her knees, breathing air that tasted like exhaust fumes and dead leaves and beautiful, mundane London. Her phone buzzed in her pocket. She pulled it out with shaking fingers. The time read 11:23 PM. She'd lost nearly five hours. The pendant cooled
slowly
against her chest, the glow fading to nothing, and when she finally straightened up and
look
ed back toward the oaks, there was nothing there. Just trees. Just dark. Just the faint, impossible scent of dying flowers on a windless night.
created_at
"2026-02-17T02:42:25.400748+00:00"
2/17/2026, 2:42:25 AM
model
"anthropic/claude-4.6-opus-20260205"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1471
moderation_latency
152
generation_time
79257
tokens_prompt
812
tokens_completion
3205
native_tokens_prompt
839
native_tokens_completion
2941
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
0.07772
router
(null)
provider_responses
0
id
"f9e6e30d-c1ae-4f5f-a7db-c3e715ca632e"
status
200
is_byok
false
latency
1471
endpoint_id
"a8708fb9-08ea-43bb-a3b1-165c87ef09df"
provider_name
"Amazon Bedrock"
model_permaslug
"anthropic/claude-4.6-opus-20260205"
api_type
"completions"
id
"gen-1771296065-oCccneHgC5TypslcqgLR"
upstream_id
"f9e6e30d-c1ae-4f5f-a7db-c3e715ca632e"
total_cost
0.07772
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Amazon Bedrock"
Evaluation details
Result
Evaluator
Details
Meta Data
100.0000%
Adverbs in dialogue tags
Target: ≤10% dialogue tags with adverbs
totalTags
0
adverbTagCount
0
adverbTags
(empty)
68.5252%
AI-ism adverb frequency
Target: <1% AI-ism adverbs (57 tracked)
wordCount
2224
totalAiIsmAdverbs
7
found
0
adverb
"perfectly"
count
1
1
adverb
"slowly"
count
3
2
adverb
"very"
count
3
highlights
0
"perfectly"
1
"slowly"
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)
86.5108%
AI-ism word frequency
Target: <1% AI-ism words (140 tracked)
wordCount
2224
totalAiIsms
3
found
0
word
"resonance"
count
2
1
word
"footsteps"
count
1
highlights
0
"resonance"
1
"footsteps"
100.0000%
Cliche density
Target: ≤1 cliche(s) per 800-word window
totalCliches
1
maxInWindow
1
found
0
label
"clenched jaw/fists"
count
1
highlights
0
"clenched her jaw"
100.0000%
Emotion telling (show vs. tell)
Target: ≤3% sentences with emotion telling
emotionTells
0
narrationSentences
159
matches
(empty)
100.0000%
Filter word density
Target: ≤12% sentences with filter/hedge words
filterCount
2
hedgeCount
3
narrationSentences
159
filterMatches
0
"look"
1
"think"
hedgeMatches
0
"seemed to"
1
"tried to"
2
"began to"
100.0000%
Overuse of "that" (subordinate clause padding)
Target: ≤10% sentences with "that" clauses
thatCount
0
totalSentences
159
matches
(empty)
100.0000%
Paragraph length variance
Target: CV ≥0.5 for paragraph word counts
totalParagraphs
50
mean
43.88
std
32.17
cv
0.733
sampleLengths
0
7
1
87
2
44
3
13
4
77
5
8
6
122
7
23
8
29
9
97
10
10
11
101
12
3
13
82
14
22
15
2
16
90
17
4
18
61
19
46
20
53
21
75
22
13
23
56
24
65
25
7
26
63
27
7
28
71
29
17
30
79
31
81
32
72
33
38
34
3
35
44
36
2
37
50
38
75
39
39
40
4
41
69
42
55
43
71
44
4
45
39
46
47
47
13
48
10
49
44
100.0000%
Passive voice overuse
Target: ≤5% passive sentences
passiveCount
4
totalSentences
159
matches
0
"was drenched"
1
"been pressed"
2
"been pressed"
3
"being dragged"
100.0000%
Past progressive (was/were + -ing) overuse
Target: ≤10% past progressive verbs
pastProgressiveCount
8
totalVerbs
357
matches
0
"was bleeding"
1
"were looking"
2
"was trying"
3
"was reacting"
4
"was glowing"
5
"was coming"
6
"was making"
7
"was burning"
92.0171%
Purple prose (modifier overload)
Target: <4% adverbs, <2% -ly adverbs, no adj stacking
wordCount
2224
adjectiveStacks
1
stackExamples
0
"small crescent-shaped scar"
adverbCount
94
adverbRatio
0.04226618705035971
lyAdverbCount
26
lyAdverbRatio
0.011690647482014389
100.0000%
Repeated phrase echo
Target: ≤20% sentences with echoes (window: 2)
totalSentences
159
echoCount
0
echoWords
(empty)
100.0000%
Sentence length variance
Target: CV ≥0.4 for sentence word counts
totalSentences
159
mean
13.8
std
11.35
cv
0.823
sampleLengths
0
7
1
37
2
37
3
3
4
10
5
29
6
6
7
9
8
13
9
14
10
19
11
18
12
2
13
10
14
14
15
8
16
10
17
51
18
3
19
3
20
26
21
29
22
4
23
19
24
8
25
5
26
16
27
4
28
17
29
4
30
30
31
5
32
5
33
22
34
10
35
10
36
4
37
13
38
54
39
6
40
6
41
6
42
3
43
9
44
3
45
4
46
26
47
9
48
5
49
38
30.5031%
Sentence opener variety
Target: ≥60% unique sentence openers
consecutiveRepeats
31
diversityRatio
0.2578616352201258
totalSentences
159
uniqueOpeners
41
100.0000%
Dialogue tag variety (said vs. fancy)
Target: ≤30% fancy dialogue tags
totalTags
0
fancyCount
0
fancyTags
(empty)
92.7974%