NC Bench
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Run: 2026-02-17-01KHMQE6P3E5V50T1V6H2WFE12
Run Details
Model:
Claude Opus 4.6
Test:
Bad Writing Habits
Scenario:
Horror: alone in an eerie place at night
Duration:
1m 17s
Cost:
$0.074695
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="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
The last bus had dropped her at the Richmond Park gate twenty minutes ago, and Rory was already regretting e
very
decision that had led her here. She'd told herself it would be simple. Get in, find the grove,
look
for the thing Isolde had mentioned — a root formation shaped like clasped hands, supposedly visible only under a new moon. Photograph it. Get out. She had her phone, a small torch, and the Heartstone pendant tucked under her jacket where the silver chain caught occasionally on the zipper teeth. Simple. Nothing about Richmond Park at eleven o'clock on a moonless night was simple. The gate had
been locked
, of course, but someone — something — had left the pedestrian access unlatched. She'd noticed that and filed it away in the part of her brain that catalogued things she'd rather not
think
about. The path from the gate led through open grassland that should have been navigable even in the dark, but the torchlight
seemed to
reach about half as far as it should, the beam swallowed by air that felt thicker than it had any right to be in late October. Rory kept to the path. The deer would be out there somewhere in the darkness, bedded down in the bracken, and she had no interest in stumbling over one. She'd seen the stags in rutting season — all heaving muscle and bone-white antler. Even sleeping, they were not creatures she wanted to surprise. The path curved south toward the Isabella Plantation, but she needed to bear west, into the older part of the park where the oaks had been growing since before anyone had thought to put a wall around them. She left the path and immediately felt the grass change beneath her trainers — longer, damper, catching at her ankles like fingers. Not like fingers. Just grass. She
was being
ridiculous. The Heartstone pendant had begun to warm against her sternum roughly four minutes ago, and she
was trying
very
hard not to
think
about what that meant. It pulsed when it was near a Hel portal. Isolde's grove was not a Hel portal. It was a pocket between Earth and the Fae realm, which was an entirely different thing, and the pendant was probably just reacting to the ambient strangeness of the area. Fae-touched ground. Residual energy. Something explicable. It pulsed again, slow and steady like a second heartbeat, and the warmth crept up toward her collarbone. Rory walked faster. The oaks appeared first as shapes — darker darknesses against the general dark, their canopies blocking out even the faint light pollution that bled over from the edges of London. She swept the torch across them and caught the silver-grey of ancient bark, the skeletal sprawl of branches that had been growing before the Tudors had hunted here. The standing stones would be beyond them, marking the boundary of the grove. She just had to find the gap between the two largest oaks, the ones Isolde had called the Gatekeepers. She found them by nearly walking into one. The torch
flickered
as she passed between the twin trunks, and for a moment the world tilted — not dramatically, not enough to make her stumble, but enough that her inner ear registered something wrong. A shift in pressure. The feeling of stepping from one room into another in a house where the floors weren't quite level. Then the torchlight steadied, and she was inside the grove. Wildflowers. Even now, even in the dead of October, they carpeted the clearing floor in blues and whites and pale yellows that had no business blooming in the cold. The standing stones — not actual stone, but petrified oak, the remnants of trees so old they'd turned to something harder than wood — ringed the clearing in a rough circle perhaps thirty feet across. The air smelled of crushed thyme and something sweeter underneath, something that reminded her of the way a room smelled after someone had been burning expensive candles and had blown them out hours ago. Warm wax and ghost-smoke. Rory stood still and listened. Nothing. That was the first wrong thing. Richmond Park at night should have sounded like something. Foxes screaming. Owls. The distant white noise of the A3. Wind in the oak canopy. Instead, the silence was so absolute that she could hear the blood moving through her own ears, that low oceanic rush that you only noticed in the quietest moments of the quietest nights. She knelt and swept the torch across the ground,
look
ing for the root formation. The wildflowers bobbed
gently
as she passed the beam over them, though there was no wind to make them move. Though there was no wind. Rory lifted her head
slowly
. The flowers were still moving. A gentle, rhythmic sway, like sea grass in a current. E
very
stem in the clearing moved in the same direction, at the same speed, as though something beneath the soil
was breathing
. She stood up. The Heartstone was properly hot now, a small coal of heat against her chest, and its pulse had quickened to match her own heartbeat. She pressed her palm flat against it through her jacket and felt the deep crimson glow even through the layers of fabric — a faint warmth against her fingers that shouldn't have been visible but was. The root formation. Find it, photograph it, leave. She moved deeper into the clearing, stepping
carefully
between the standing stones. Her torch caught something on the nearest one — marks she hadn't noticed before. Not carved. Grown into the petrified wood, the way grain patterns form in timber, except these
look
ed deliberate. Spiral patterns. Or not spirals — they moved in one direction and then doubled back, creating a shape that her eyes wanted to follow but that her brain couldn't resolve into meaning. She
look
ed away and felt mildly nauseous. Behind her, a twig broke. The sound was small and specific. Not the general creaking of old wood settling. A single dry snap, like a foot coming down on a fallen branch. Rory turned the torch toward the sound. The beam hit the twin oaks she'd entered through, and for a moment — for just a fraction of a moment, less time than it took to blink — there was something between them. A shape. Tall and narrow and wrong in its proportions, the way a person
look
ed when photographed with a warped lens. Too long in the limbs. Head tilted at an angle that suggested a neck with too many vertebrae. Then the beam steadied and there was nothing. Just the gap between the oaks and the darkness of the park beyond. Rory did not move. She did not breathe. She held the torch with both hands and kept the beam fixed on the space between the trees and waited for her rational mind to come back online and explain what she had or had not just seen. Her rational mind offered nothing useful. She became aware, in the silence that followed, of a sound. Not the twig again. Something worse. A low, arrhythmic clicking that
seemed to
come from e
very
where at once — from the standing stones, from the ground beneath her feet, from the canopy above. It sounded like someone running a fingernail along the teeth of a comb, except slower and more deliberate. Click. Click. Click-click. A pause. Click. Like something
was learning
a pattern. Like something
was trying
to communicate. Rory lowered the torch and let the beam fall on the ground near her feet. She was shaking now and she hated it — hated the animal fear that was flooding her limbs with adrenaline and telling her to run. She was Rory Carter. She was cool-headed and intelligent and known for quick out-of-the-box
think
ing. She did not panic. The clicking stopped. In its absence, she heard something else. Breathing. Not her own. She
was holding
hers, had been holding it for what felt like a full minute, her lungs burning with the effort. The breathing
was coming
from her left, from just beyond the nearest standing stone, and it was slow and wet and ragged in a way that made her
think
of punctured things. Of lungs that were not shaped correctly. She turned the torch toward it. The standing stone was perhaps eight feet tall, the width of a man's shoulders. The torch beam crept around its edge and illuminated the grass beyond it. The wildflowers there had stopped moving. They were pressed flat against the earth, e
very
single one of them, as though something heavy had just passed over them. A trail of crushed flowers led from the stone toward the center of the clearing. Toward where she
was standing
. Rory
look
ed down. At her feet, the grass was untouched. The flowers bobbed in their invisible current. But three feet to her right, a single white flower was
slowly
pressing itself down against the soil, its stem bending with the delicacy of a thing being
carefully
,
precisely
stepped on. Then another. Closer. Something
was walking
toward her and she could not see it. The Heartstone flared against her chest with a heat that was almost painful, and in the burst of crimson light that bled through her jacket, the clearing
was illuminated
for perhaps half a second. In that half second, she saw e
very
thing — the standing stones with their spiral marks, the wildflowers in their wrong-season bloom, the twin oaks at the boundary, and between them and her, occupying a space that should have been empty air, a shadow that stood on the ground without anything to cast it. It had no edges. No form. It was simply an absence of light in the shape of something that had never been human, and it was close enough that she could have reached out and touched it. The Heartstone's light died. The darkness crashed back in. Rory ran. She did not run toward the twin oaks because the shadow was between her and them. She went sideways, vaulting one of the shorter standing stones with a hand planted on its petrified surface — the wood was warm, almost feverishly so, and she felt the spiral marks squirm under her palm like living things — and then she
was crashing
through the boundary of the grove into the open parkland, the torch beam swinging wildly, her breath tearing out of her in ragged gasps that fogged the October air. She ran until the grass shortened beneath her feet and the path appeared, pale and solid and blessedly ordinary. She ran until she could hear the distant rush of the A3, until a fox screamed somewhere to the north and the sound was the most beautiful thing she'd ever heard because it meant the world had sounds again. She ran until the Heartstone cooled against her chest and went dormant, its pulse fading to nothing. At the gate, she stopped. Her hands
were shaking
so badly that it took three attempts to get her phone out of her pocket. The screen told her it was 11:07 p.m. She'd left the bus stop at 10:40. She'd been in the park for twenty-seven minutes. That couldn't be right. She'd spent at least an hour in the grove. At least. Time moves differently. An hour inside can be minutes or days outside. Rory leaned against the gate and pressed the heels of her hands against her eyes until she saw phosphene stars. She had not gotten the photograph. She had not found the root formation. She had found something else instead, something that the Heartstone had recognized, something that had walked toward her on invisible legs and breathed with lungs that did not work correctly. She pushed off the gate and walked toward the bus stop on legs that felt borrowed, her left hand wrapped unconsciously around her right wrist, her thumb pressing the crescent scar there — the old, familiar geography of her own skin. She was real. This was London. The next bus would come, and she would get on it, and she would go home to her flat above Silas' bar and lock the door and not
think
about the fact that the shadow between the oaks had been standing on the flowers without bending them, but the ones near her feet had
been pressed
down by something with
weight
. Two things. There had been two things in the grove. The bus came. Rory got on. She sat in the bright fluorescent light among the late-night passengers and the drunk students and she held the Heartstone through her jacket and did not let go until she was home, and even then, even behind a locked door with the lights on and the kettle boiling, she could not shake the feeling that something had followed her out. That something was still learning her pattern. Click. Click. Click-click.
created_at
"2026-02-17T02:40:17.209257+00:00"
2/17/2026, 2:40:17 AM
model
"anthropic/claude-4.6-opus-20260205"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1384
moderation_latency
201
generation_time
76573
tokens_prompt
812
tokens_completion
3160
native_tokens_prompt
839
native_tokens_completion
2820
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
0.074695
router
(null)
provider_responses
0
id
"msg_01VBgJW4rYVnpGhqS7fhLg86"
status
200
is_byok
false
latency
1384
endpoint_id
"c926c048-563e-44b0-8434-95965bee924c"
provider_name
"Anthropic"
model_permaslug
"anthropic/claude-4.6-opus-20260205"
api_type
"completions"
id
"gen-1771295939-LXBFqv0lMzzcGcuhQPcp"
upstream_id
"msg_01VBgJW4rYVnpGhqS7fhLg86"
total_cost
0.074695
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
0
adverbTagCount
0
adverbTags
(empty)
67.3812%
AI-ism adverb frequency
Target: <1% AI-ism adverbs (57 tracked)
wordCount
2146
totalAiIsmAdverbs
7
found
0
adverb
"carefully"
count
2
1
adverb
"gently"
count
1
2
adverb
"precisely"
count
1
3
adverb
"slowly"
count
2
4
adverb
"very"
count
1
highlights
0
"carefully"
1
"gently"
2
"precisely"
3
"slowly"
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)
90.6803%
AI-ism word frequency
Target: <1% AI-ism words (140 tracked)
wordCount
2146
totalAiIsms
2
found
0
word
"flickered"
count
1
1
word
"weight"
count
1
highlights
0
"flickered"
1
"weight"
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
165
matches
(empty)
100.0000%
Filter word density
Target: ≤12% sentences with filter/hedge words
filterCount
2
hedgeCount
2
narrationSentences
165
filterMatches
0
"look"
1
"think"
hedgeMatches
0
"seemed to"
100.0000%
Overuse of "that" (subordinate clause padding)
Target: ≤10% sentences with "that" clauses
thatCount
0
totalSentences
165
matches
(empty)
100.0000%
Paragraph length variance
Target: CV ≥0.5 for paragraph word counts
totalParagraphs
58
mean
37.17
std
33.89
cv
0.912
sampleLengths
0
26
1
64
2
13
3
88
4
53
5
60
6
5
7
4
8
79
9
18
10
3
11
90
12
8
13
57
14
10
15
102
16
5
17
1
18
63
19
34
20
5
21
42
22
63
23
8
24
83
25
5
26
27
27
80
28
21
29
46
30
6
31
68
32
12
33
59
34
3
35
8
36
63
37
6
38
69
39
5
40
49
41
3
42
11
43
124
44
4
45
5
46
2
47
90
48
75
49
47
100.0000%
Passive voice overuse
Target: ≤5% passive sentences
passiveCount
3
totalSentences
165
matches
0
"been locked"
1
"was illuminated"
2
"been pressed"
100.0000%
Past progressive (was/were + -ing) overuse
Target: ≤10% past progressive verbs
pastProgressiveCount
12
totalVerbs
337
matches
0
"was being"
1
"was breathing"
2
"was learning"
3
"was trying"
4
"was shaking was flooding"
5
"was holding"
6
"was coming"
7
"was standing"
8
"was walking"
9
"was crashing"
10
"were shaking"
96.6729%
Purple prose (modifier overload)
Target: <4% adverbs, <2% -ly adverbs, no adj stacking
wordCount
2146
adjectiveStacks
0
stackExamples
(empty)
adverbCount
94
adverbRatio
0.04380242311276794
lyAdverbCount
27
lyAdverbRatio
0.012581547064305684
100.0000%
Repeated phrase echo
Target: ≤20% sentences with echoes (window: 2)
totalSentences
165
echoCount
0
echoWords
(empty)
100.0000%
Sentence length variance
Target: CV ≥0.4 for sentence word counts
totalSentences
165
mean
13.07
std
13.4
cv
1.025
sampleLengths
0
26
1
7
2
27
3
2
4
2
5
25
6
1
7
13
8
18
9
21
10
49
11
5
12
24
13
14
14
10
15
38
16
22
17
3
18
2
19
4
20
27
21
9
22
7
23
30
24
2
25
2
26
2
27
18
28
3
29
30
30
28
31
13
32
19
33
8
34
35
35
4
36
18
37
10
38
1
39
28
40
35
41
34
42
4
43
5
44
1
45
6
46
9
47
2
48
1
49
7
38.5859%
Sentence opener variety
Target: ≥60% unique sentence openers
consecutiveRepeats
23
diversityRatio
0.3151515151515151
totalSentences
165
uniqueOpeners
52
100.0000%
Dialogue tag variety (said vs. fancy)
Target: ≤30% fancy dialogue tags
totalTags
0
fancyCount
0
fancyTags
(empty)
93.7247%