NC Bench
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Run: 2026-02-17-01KHMRCKYA440TK3XFJ2XKHF11
Run Details
Model:
Claude Opus 4.6
Test:
Bad Writing Habits
Scenario:
Horror: alone in an eerie place at night
Duration:
1m 4s
Cost:
$0.062770
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 from Richmond had been nearly empty, just Rory and a man who smelled of wet wool and wouldn't stop clicking his tongue against his teeth. She'd gotten off two stops early to be rid of him and walked the rest of the way along the park wall in the dark, her trainers scuffing through wet leaves that had gathered against the pavement like small drowning things. She shouldn't have come at night. She knew that. Eva would have said as much, would have called her a stupid cow and meant it lovingly. But the pendant had been warm against her sternum all day — not the faint background hum she'd grown accustomed to, but a steady, insistent heat, like a coal pressed to skin through cotton. And the text from the unknown number had said midnight, had said the grove, had said come alone or don't come at all. So here she was. Alone, and coming anyway. The gap in the park wall was where it always was, half-hidden by a sprawl of ivy that should have died back months ago but never did. Rory pushed through it sideways,
feel
ing the leaves drag wet fingers across her neck, and dropped down into the grass on the other side. Richmond Park at midnight was a different country. The sodium glow of the streetlamps didn't reach past the wall. The city sounds — the distant arterial hum of the A316, a siren threading itself thin across Twickenham — fell away as though someone had
slowly
turned a dial. She stood still for a moment, letting her eyes adjust, and listened. Wind in the canopy. The soft percussion of water dripping from branch to branch somewhere ahead. Nothing else. She crossed the open ground
quickly
, keeping her head down,
navigating
by memory and by the
feel
of the terrain under her feet. The grass gave way to bracken, the bracken to the broad root-knuckled floor of the old oaks, and then she could see the stones. They didn't look like standing stones in any traditional sense. They looked like trees that had forgotten how to be trees — ancient oaks gone grey and smooth, stripped of bark and branch, narrowed to rough pillars that formed an imperfect circle in a clearing no map had ever shown. Wildflowers grew between them. Even now, in November, she could see pale blooms nodding in the dark, their petals catching what little light filtered through the canopy. Snowdrops, or something that wanted to be mistaken for snowdrops. Rory stepped between two of the stones and into the grove. The temperature changed. Not dramatically — not the way stepping into a walk-in freezer changes things — but in the way a room changes when someone opens a window you can't see. The air moved differently. It tasted different. Greener, somehow, and older, and faintly sweet in a way that sat wrong on the back of her tongue. The pendant flared hot. She pressed her hand to it through her jacket,
feel
ing the shape of the crimson stone against her palm. Thumbnail-sized, silver-chained, unremarkable to look at unless you caught it in the right light and saw the slow pulse of its inner glow, like a heartbeat rendered in garnet. She didn't know why it did what it did. She didn't know who had left it for her, tucked into a takeaway bag from the Golden Empress with a note that said only keep this close. She knew only that it reacted to things she couldn't see, and that when it burned like this, she should pay attention. She was paying attention. The grove was wrong tonight. It took her a moment to identify why. The flowers
were facing
the wrong direction. All of them — e
very
pale bloom in the clearing — had turned to face the centre of the circle, their heads bowed inward like congregants at prayer. She'd been here four times before, and the flowers had always faced outward, toward the stones, toward whatever light they could find. Now they strained toward a point in the middle of the grove where the grass grew tallest and the dark
seemed to
gather and thicken like something with
weight
. Rory stopped walking. She stood perhaps ten feet inside the boundary, close enough to the nearest stone that she could have reached back and touched it. She did not reach back. She didn't want to know what it would
feel
like right now. A sound reached her. Not wind, not water. A tapping. Arhythmic and soft, like fingernails on wood, coming from somewhere to her left. She turned her head
slowly
and saw nothing — just the dark spaces between the stones, the undergrowth beyond, the suggestion of tree trunks in the deeper black. The tapping stopped. Then started again, from her right. She kept her breathing even. Counted the stones. There should have been nine. She'd counted them e
very
time she'd come. Nine grey pillars, irregularly spaced, forming a rough circle roughly forty feet across. She counted them now. Ten. She counted again, starting from the tallest, the one she'd entered beside, working clockwise. One, two, three, four, five, six, seven, eight, nine, ten. She went back. Slower this time. The tenth was on the far side of the circle, directly opposite her. It was narrower than the others, and
slightly
darker, and when she stared at it for too long her eyes watered as though she
were looking
at a bright light instead of a shadow. It hadn't been there before. The pendant's heat intensified. Not painful yet, but close — an urgent, blood-warm insistence against her chest, as though the stone
were trying
to burrow through her ribs and get away from something. She covered it with both hands and held it still. The tapping came again. Closer now, and from multiple directions at once — a scattered, patternless percussion that surrounded the grove's edge like rain on a tin roof, except that it wasn't rain and there was no roof and each individual tap had a deliberateness to it that rain did not possess. Something moved. She caught it at the
very
edge of her vision — a shift in the darkness between two stones on her left, a vertical displacement, as though something tall had straightened up from a crouch and then gone still again the instant she looked. There was nothing there. Just the gap between stones five and six, and the black beyond, and the faintest suggestion of breath that wasn't hers. She should leave. The thought arrived clearly and
completely
, the way good thoughts do. She should turn around, step back between the entry stones, and walk out of the grove, and keep walking until she hit the park wall and the road and the sodium light and the sounds of a city that had the basic decency to be noisy. She should go home. She should climb the stairs above Silas's bar and lock the door and sit on her bed and be somewhere that was not here. She didn't move. The grass at the centre of the grove rippled. There was no wind. The air in the circle had gone
perfectly
still — she could
feel
the stillness on her skin, a breathless, pressurized absence of movement that made her eardrums ache. But the grass moved anyway, bending and swaying in a slow circular pattern, as though something large and invisible
were walking
through it in a tight, patient orbit. The flowers tracked it. Their pale heads turned in unison, following the unseen circuit, a ring of small blind faces chasing something she couldn't see. Rory's fingers found the crescent-shaped scar on her left wrist. She pressed her thumbnail into it, hard, the way she always did when she needed to anchor herself — a habit from childhood, from the moment a broken teacup had opened the skin and her mother had told her scars were just the body's way of remembering what it had survived. The tenth stone moved. It was subtle. If she'd blinked, she would have missed it. But she didn't blink, and she saw it — a lateral shift of perhaps two inches, the stone sliding sideways without sound, without any visible mechanism of locomotion. It was closer to the ninth stone now. Closer to the gap she had not entered through. She watched it, and as she watched, she understood something that made the heat of the pendant
feel
very
far away and
very
unimportant. The tenth stone was not a stone. It had no texture, no grain, no lichen. It was a shape. A tall, narrow, upright shape that was darker than the dark around it, and it
was standing
where a stone should be because it wanted to be mistaken for a stone, and it had
been mistaken
for a stone right up until the moment it moved, and now it
knew that she
knew, and it had stopped pretending. The tapping ceased. E
very
sound ceased. The grove held its breath. Rory stood in the silence and felt the pendant burn against her chest and felt the scar
throb
under her thumbnail and felt the particular, exquisite terror of
being seen
by something she could not properly see. The dark shape across the circle did not move again. It didn't need to. It had closed the distance by inches, by patience, by the simple arithmetic of a predator that had all the time in the world and
knew that its
prey had already made the mistake of stepping inside the ring. The flowers had stopped turning. They faced her now. All of them. E
very
white bloom in the clearing had swiveled to point at her, and in the faint, impossible glow of the Heartstone she could
see that they
were not snowdrops. They had never been snowdrops. Snowdrops did not have petals that tapered to points like teeth, and they did not grow from soil that was the wrong colour, and they did not lean toward warmth the way these
were leaning
toward her. Time moved differently in the grove. She knew this. An hour inside could be minutes outside, or days. She had no idea how long she'd been standing here. It felt like seconds. It felt like her whole life. Behind her, close enough that she felt the displacement of air against the back of her neck, something exhaled. It smelled green, and old, and faintly sweet. Rory did not turn around. She kept her eyes on the shape across the circle, and she pressed her thumbnail deeper into the scar on her wrist, and she breathed in, and she breathed out, and she waited for whatever happened next in the terrible, patient silence of a place that was no longer pretending to be empty.
created_at
"2026-02-17T02:56:40.196361+00:00"
2/17/2026, 2:56:40 AM
model
"anthropic/claude-4.6-opus-20260205"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1472
moderation_latency
(null)
generation_time
63614
tokens_prompt
812
tokens_completion
2600
native_tokens_prompt
839
native_tokens_completion
2343
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
0.06277
router
(null)
provider_responses
0
id
"msg_01UhWqxNd5BVmFMtpUSRR6TR"
status
200
is_byok
false
latency
1472
endpoint_id
"c926c048-563e-44b0-8434-95965bee924c"
provider_name
"Anthropic"
model_permaslug
"anthropic/claude-4.6-opus-20260205"
api_type
"completions"
id
"gen-1771296935-EdSR4U1dEu2pfTcVYbi3"
upstream_id
"msg_01UhWqxNd5BVmFMtpUSRR6TR"
total_cost
0.06277
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)
50.0278%
AI-ism adverb frequency
Target: <1% AI-ism adverbs (57 tracked)
wordCount
1801
totalAiIsmAdverbs
9
found
0
adverb
"completely"
count
1
1
adverb
"perfectly"
count
1
2
adverb
"quickly"
count
1
3
adverb
"slightly"
count
1
4
adverb
"slowly"
count
2
5
adverb
"very"
count
3
highlights
0
"completely"
1
"perfectly"
2
"quickly"
3
"slightly"
4
"slowly"
5
"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)
83.3426%
AI-ism word frequency
Target: <1% AI-ism words (140 tracked)
wordCount
1801
totalAiIsms
3
found
0
word
"throb"
count
1
1
word
"weight"
count
1
2
word
"navigating"
count
1
highlights
0
"throb"
1
"weight"
2
"navigating"
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
126
matches
(empty)
100.0000%
Filter word density
Target: ≤12% sentences with filter/hedge words
filterCount
1
hedgeCount
1
narrationSentences
126
filterMatches
0
"feel"
hedgeMatches
0
"seemed to"
100.0000%
Overuse of "that" (subordinate clause padding)
Target: ≤10% sentences with "that" clauses
thatCount
3
totalSentences
126
matches
0
"knew that she"
1
"knew that its"
2
"see that they"
100.0000%
Paragraph length variance
Target: CV ≥0.5 for paragraph word counts
totalParagraphs
44
mean
41.11
std
35.25
cv
0.857
sampleLengths
0
69
1
83
2
8
3
111
4
18
5
47
6
87
7
11
8
58
9
4
10
106
11
4
12
5
13
94
14
3
15
40
16
54
17
6
18
37
19
1
20
77
21
5
22
43
23
52
24
2
25
69
26
3
27
85
28
3
29
70
30
25
31
61
32
4
33
56
34
101
35
3
36
3
37
5
38
90
39
83
40
38
41
19
42
8
43
58
100.0000%
Passive voice overuse
Target: ≤5% passive sentences
passiveCount
2
totalSentences
126
matches
0
"been mistaken"
1
"being seen"
100.0000%
Past progressive (was/were + -ing) overuse
Target: ≤10% past progressive verbs
pastProgressiveCount
6
totalVerbs
290
matches
0
"were facing"
1
"were looking"
2
"were trying"
3
"were walking"
4
"was standing"
5
"were leaning"
87.5336%
Purple prose (modifier overload)
Target: <4% adverbs, <2% -ly adverbs, no adj stacking
wordCount
1801
adjectiveStacks
2
stackExamples
0
"broad root-knuckled floor"
1
"urgent, blood-warm insistence"
adverbCount
73
adverbRatio
0.04053303720155469
lyAdverbCount
21
lyAdverbRatio
0.011660188784008884
100.0000%
Repeated phrase echo
Target: ≤20% sentences with echoes (window: 2)
totalSentences
126
echoCount
0
echoWords
(empty)
100.0000%
Sentence length variance
Target: CV ≥0.4 for sentence word counts
totalSentences
126
mean
14.36
std
13.16
cv
0.917
sampleLengths
0
28
1
41
2
6
3
3
4
17
5
34
6
23
7
4
8
4
9
27
10
24
11
8
12
11
13
29
14
12
15
4
16
12
17
2
18
23
19
24
20
10
21
40
22
4
23
23
24
10
25
11
26
3
27
29
28
4
29
3
30
19
31
4
32
19
33
29
34
9
35
27
36
22
37
4
38
5
39
8
40
7
41
28
42
22
43
29
44
3
45
23
46
5
47
12
48
4
49
4
38.8889%
Sentence opener variety
Target: ≥60% unique sentence openers
consecutiveRepeats
16
diversityRatio
0.30952380952380953
totalSentences
126
uniqueOpeners
39
100.0000%
Dialogue tag variety (said vs. fancy)
Target: ≤30% fancy dialogue tags
totalTags
0
fancyCount
0
fancyTags
(empty)
91.7525%