NC Bench
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Run: 2026-02-17-01KHMQE6P7F6CWD14Z4B9EHDNS
Run Details
Model:
Claude Haiku 4.5
Test:
Bad Writing Habits
Scenario:
Horror: alone in an eerie place at night
Duration:
23.0s
Cost:
$0.010778
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
Rory ducked beneath the oak's lowest branch, her breath misting in the November air. The boundary stones rose before her like crooked teeth, older than memory, their bark crusted with lichen that gleamed silver in the moonlight. She'd memorized the way here during daylight reconnaissance, but at night, Richmond Park became a different animal. The usual dog walkers and joggers were long gone, replaced by the susurrus of wind through bare branches and the distant sound of traffic bleeding through from the A307. The Heartstone pendant hung warm against her collarbone. That was new—it had been cool when she'd left the flat an hour ago, hanging beneath her jumper like it always did. Now it pulsed with a steady, faint heat that she could feel even through the layers of fabric. She'd come to the grove because of the dreams. Three nights running, she'd woken with the taste of copper on her tongue and the image of that clearing seared into her mind. Not just any clearing—*that* clearing, the one with the perpetually blooming wildflowers that shouldn't exist in November, the one that existed in a fold between worlds. Isolde's grove, Eva had called it once, before she'd made Rory promise never to go back alone. But Eva
wasn't answering
her phone anymore. And the dreams
were getting
worse. The pendant pulsed again, warmer now. Rory's jaw tightened. A Hel portal. That's what the heat meant. Somewhere nearby, the boundary between worlds
was thinning
. She stepped through the standing stones. The temperature dropped immediately, ten degrees in the space between one breath and the next. Her lungs seized. She could see her breath now—not the fine misting of a cold night, but thick plumes of vapor as if she'd stepped into a freezer. The shift was so abrupt that her body protested, a primal resistance that made her teeth ache. The grove spread before her, looking exactly as she remembered it. Wildflowers in impossible profusion—lupines and foxgloves and roses that should have withered weeks ago. The grass was green and thick, springy beneath her trainers. Above, the sky was a different quality of dark than the sky outside; the stars were dimmer, somehow farther away, as if she
were viewing
them through layers of glass. The pendant's pulse had become a steady
throb
now, insistent as a heartbeat. Rory moved into the clearing, her senses stretched taut. The air tasted wrong—sweet and mineral, like licking a battery. Her ears popped as if she
were ascending
in an aeroplane. She'd been in the grove before, briefly, but never at night. Never alone. The place felt different in the dark, watchful in a way that made her aware of how
utterly
isolated she was. No ambient sound of traffic now. No distant hum of human civilization. Just the wind—which didn't quite sound like wind, she realized. It had a hollow quality, like breath through teeth. She moved deeper into the clearing, toward the heart of it where the flowers grew thickest. The pendant burned now, almost uncomfortably hot. Whatever portal it sensed, she
was getting
closer. That's when she heard it. A sound like
footsteps
on the far side of the clearing. Not tentative, uncertain
footsteps
—confident ones. Someone walking at a normal pace through the grass and flowers, as if they belonged here. Rory's hand went to her jacket pocket, where she'd stuffed the small canister of pepper spray Eva had insisted she carry. Her eyes strained in the darkness, trying to pierce the shadows at the grove's edge. The flowers
seemed to
glow faintly here, their colors deepened by the strange light. Reds looked black. The whites looked gray. The
footsteps
stopped. "Who's there?" Rory called out. Her voice sounded smaller than she'd intended, swallowed by the non-air of the place. She cleared her throat, tried again. "I know you're there. I heard you." Nothing. The wind that wasn't quite wind rustled through the flowers. A scent drifted across the clearing—sweet rot, like fruit left too long in the sun. The smell made her stomach turn. The pendant pulsed, and for just a moment she could have sworn it blazed with crimson light bright enough to see by. She spun around, but the clearing was empty. Just wildflowers and dark and the breathing of that strange wind. There. Movement at the edge of her vision. Just a shadow, just a shape passing between two denser clusters of flowering vines. Too tall to be a deer. Too purposeful to be anything wild. "Eva?" Rory's voice cracked
slightly
.
"Is that you?"
The shape stopped moving. In the silence that followed, Rory became aware of how her own breathing sounded—loud, rapid, the sound of prey animal prey. Her hands were trembling. She curled them into fists. Then came a sound that froze her
completely
. It was laughter—except it wasn't. It had the shape and rhythm of laughter, but the texture was wrong. It sounded like wind over broken glass, like air escaping from a tomb, like something remembering the shape of joy without ever having felt it. Every muscle in Rory's body went rigid. The shape moved again, crossing the clearing in the periphery of her vision. When she turned her head to look directly at it, there was nothing there. But the moment her eyes moved away, she could sense it again—a dark shape, man-shaped but subtly wrong about the proportions. The arms
seemed to
o long. The head sat at an angle that shouldn't have been comfortable. The pendant was incandescent now, a point of burning heat at her throat that made her want to rip it off. She forced her hands to stay still. "What are you?" she whispered. The laughing-that-wasn't-laughter came again, closer this time. It
seemed to
come from behind her. She spun, but the clearing was empty. Or full. She couldn't quite tell anymore. There
seemed to
be movement everywhere now—shadows flowing between the flowers, shapes that resolved into nothing the moment she focused on them. The wind picked up, carrying that rotten-fruit stench, and the flowers
began to
sway in patterns that didn't match the direction of the wind. Rory's breath came in short, sharp gasps. Her vision
was beginning
to tunnel. The pendant burned against her skin, and she realized with horrible clarity that she'd made a mistake. Coming here. Coming alone. Coming at night. A sound. Not wind now. Whispering. Multiple voices, speaking in a language that predated human language, a tongue made of empty spaces and held breath and the sound of something ancient stirring in the dark. The words meant nothing and everything. They conveyed urgency. Hunger. An awful, specific interest in her. The shape materialized in front of her. It was there one moment, not there the next. Fully corporeal, close enough to touch. She could see the outline of it—the too-long arms, the head that tilted at that impossible angle. She couldn't see features, exactly, but she could feel the
weight
of its attention, a pressure against her mind like deep water pressing on a submerged thing. Rory's hand found the pepper spray. She yanked it free and fired. The canister hissed. The spray
hung in the air
for a split-second and then dissipated as if the air itself had refused to carry it. The shape didn't move. Didn't react. But the whispering intensified, becoming a chorus, becoming a sound that was almost like applause. Rory ran. She crashed through the wildflowers, not caring which direction, only knowing she had to get to the boundary stones, had to get out, had to get back to a world where things obeyed the laws of physics and didn't laugh like breaking glass. The flowers
seemed to
grab at her ankles—she fell, hands slamming into the grass, and she felt it then, a touch on the back of her neck. Not quite contact. Close enough. The pendant blazed with impossible heat. She scrambled to her feet and ran. The oak boundary stones
loomed
before her, ancient and solid and real. She threw herself between them and fell to her knees on the cold November grass of Richmond Park, gasping, shaking, feeling the night air of the actual world rush into her lungs like salvation. Behind her, beyond the stones, the whispering had stopped. But she could still feel it. Waiting. Patient. Interested. The pendant
was cooling
against her chest, but it no longer felt like protection. It felt like a
beacon
. And somewhere in the darkness behind her, she was sure she could hear that terrible laughing resume.
created_at
"2026-02-17T02:39:23.319358+00:00"
2/17/2026, 2:39:23 AM
model
"anthropic/claude-4.5-haiku-20251001"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
412
moderation_latency
178
generation_time
22069
tokens_prompt
812
tokens_completion
2170
native_tokens_prompt
838
native_tokens_completion
1988
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
0.010778
router
(null)
provider_responses
0
id
"msg_01GmHCMbHqh7ZjTkwFRpq8T9"
status
200
is_byok
false
latency
412
endpoint_id
"41d2915a-92e6-4993-b537-210b4e10cba8"
provider_name
"Anthropic"
model_permaslug
"anthropic/claude-4.5-haiku-20251001"
api_type
"completions"
id
"gen-1771295939-leZCWYYG4Qt1ulnNkuqk"
upstream_id
"msg_01GmHCMbHqh7ZjTkwFRpq8T9"
total_cost
0.010778
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
2
adverbTagCount
0
adverbTags
(empty)
79.2244%
AI-ism adverb frequency
Target: <1% AI-ism adverbs (57 tracked)
wordCount
1444
totalAiIsmAdverbs
3
found
0
adverb
"completely"
count
1
1
adverb
"slightly"
count
1
2
adverb
"utterly"
count
1
highlights
0
"completely"
1
"slightly"
2
"utterly"
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)
51.5235%
AI-ism word frequency
Target: <1% AI-ism words (140 tracked)
wordCount
1444
totalAiIsms
7
found
0
word
"beacon"
count
1
1
word
"throb"
count
1
2
word
"loomed"
count
1
3
word
"weight"
count
1
4
word
"footsteps"
count
3
highlights
0
"beacon"
1
"throb"
2
"loomed"
3
"weight"
4
"footsteps"
100.0000%
Cliche density
Target: ≤1 cliche(s) per 800-word window
totalCliches
1
maxInWindow
1
found
0
label
"hung in the air"
count
1
highlights
0
"hung in the air"
100.0000%
Emotion telling (show vs. tell)
Target: ≤3% sentences with emotion telling
emotionTells
0
narrationSentences
134
matches
(empty)
100.0000%
Filter word density
Target: ≤12% sentences with filter/hedge words
filterCount
0
hedgeCount
6
narrationSentences
134
filterMatches
(empty)
hedgeMatches
0
"seemed to"
1
"began to"
100.0000%
Overuse of "that" (subordinate clause padding)
Target: ≤10% sentences with "that" clauses
thatCount
1
totalSentences
136
matches
0
"\"Is that you?\""
100.0000%
Paragraph length variance
Target: CV ≥0.5 for paragraph word counts
totalParagraphs
40
mean
35.58
std
25.61
cv
0.72
sampleLengths
0
83
1
48
2
75
3
13
4
25
5
6
6
60
7
65
8
13
9
95
10
31
11
5
12
32
13
57
14
3
15
32
16
54
17
19
18
34
19
8
20
34
21
51
22
7
23
64
24
28
25
5
26
74
27
37
28
51
29
7
30
59
31
12
32
46
33
2
34
75
35
6
36
53
37
18
38
19
39
17
100.0000%
Passive voice overuse
Target: ≤5% passive sentences
passiveCount
0
totalSentences
134
matches
(empty)
100.0000%
Past progressive (was/were + -ing) overuse
Target: ≤10% past progressive verbs
pastProgressiveCount
8
totalVerbs
238
matches
0
"wasn't answering"
1
"were getting"
2
"was thinning"
3
"were viewing"
4
"were ascending"
5
"was getting"
6
"was beginning"
7
"was cooling"
89.7843%
Purple prose (modifier overload)
Target: <4% adverbs, <2% -ly adverbs, no adj stacking
wordCount
1428
adjectiveStacks
1
stackExamples
0
"thick, springy beneath her"
adverbCount
64
adverbRatio
0.04481792717086835
lyAdverbCount
14
lyAdverbRatio
0.00980392156862745
100.0000%
Repeated phrase echo
Target: ≤20% sentences with echoes (window: 2)
totalSentences
136
echoCount
0
echoWords
(empty)
100.0000%
Sentence length variance
Target: CV ≥0.4 for sentence word counts
totalSentences
136
mean
10.46
std
8.08
cv
0.772
sampleLengths
0
14
1
23
2
17
3
29
4
8
5
22
6
18
7
9
8
23
9
26
10
17
11
7
12
6
13
6
14
3
15
3
16
5
17
8
18
6
19
15
20
3
21
25
22
17
23
11
24
14
25
10
26
30
27
13
28
9
29
10
30
11
31
11
32
2
33
21
34
6
35
6
36
10
37
9
38
16
39
7
40
8
41
5
42
11
43
5
44
16
45
21
46
15
47
14
48
3
49
4
49.0196%
Sentence opener variety
Target: ≥60% unique sentence openers
consecutiveRepeats
15
diversityRatio
0.3602941176470588
totalSentences
136
uniqueOpeners
49
50.0000%
Dialogue tag variety (said vs. fancy)
Target: ≤30% fancy dialogue tags
totalTags
2
fancyCount
1
fancyTags
0
"whispered (whisper)"
89.3854%