NC Bench
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Run: 2026-02-17-01KHMMJDNFJG7T2TNDCJ4SQ68F
Run Details
Model:
Claude 3.7 Sonnet
Test:
Bad Writing Habits
Scenario:
Horror: alone in an eerie place at night
Duration:
41.1s
Cost:
$0.034149
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 pendant grew warm against Rory's skin as she stepped between the ancient oak standing stones. Richmond Park had closed hours ago, but she'd found the gap in the fence where Eva had said it would be. Shadows pooled beneath the trees, deeper than they should be even under the thin crescent moon. "This is mad," Rory whispered to herself, her breath clouding in the unseasonable chill. The Heartstone pulsed against her collarbone, its warmth intensifying as if responding to her words. She'd come because of the dreams—three nights of the same vision. This clearing. The standing stones. A voice telling her the answers she sought
were waiting
in the Fae Grove. After everything she'd learned since fleeing Cardiff, she couldn't dismiss it as mere coincidence. Dry leaves crunched beneath her boots as she ventured deeper into the grove. The city sounds—distant traffic, sirens, the low hum of urban life—faded with each step until all she could hear was her own breathing and the soft rustle of wind through leaves. Except there was no wind. Rory stopped, scanning the darkness. Wildflowers carpeted the ground, their pale blooms
luminous
in the darkness—wildflowers in November. The wrongness of it prickled at the back of her neck. "Hello?" she called, immediately regretting breaking the silence. Her voice sounded flat, absorbed by the darkness rather than carrying. The pendant's warmth intensified, bordering on uncomfortable now. Rory pulled it out from beneath her jacket, its deep crimson stone glowing with a faint inner light. The silver chain caught the meager moonlight as it dangled from her fingers. Something moved at the edge of her vision. Rory spun, heart
lurching
, but saw only trees and shadows. She shook her head. "Get it together, Carter," she muttered, using her surname as she did when steeling herself. The clearing opened before her, a perfect circle surrounded by those ancient, twisted oaks. At its center stood a flat stone that might have been an altar or table, its surface carved with spiraling patterns too regular to be natural erosion. The Heartstone tugged, a sudden, impossible
weight
pulling at her neck, drawing her toward the stone. She checked her
watch
—11:47 PM. She had work in the morning; Yu-Fei would kill her if she was late for deliveries again. But the pendant insisted, and after everything that had happened since finding it among her belongings six weeks ago, Rory had learned to trust its guidance. As she approached the central stone, the air thickened. Not humid, but viscous, as if moving through gelatin. Sound dampened further. The pendant's glow intensified, painting her hands crimson. A twig snapped behind her. Rory whirled, scanning the tree line. "Is someone there?" The words emerged as barely a whisper. Nothing answered but silence—a silence too complete to be natural. No insects. No rustling leaves. Not even the sound of her own heartbeat in her ears. The pendant grew hotter still. She wanted to remove it, but some instinct told her that would be a terrible mistake. She turned back to the stone altar and froze. A small leather-bound book now lay at its center. "That wasn't there before," she said, her voice sounding distant and small even to her own ears. The rational part of her brain—the part her father had cultivated through years of logical debate over dinner tables—insisted she turn around, leave the grove, and never return. But the part of her that had followed Eva's cryptic message to London, the part that had accepted the reality of things that shouldn't
exist—that part
urged her forward. Three steps brought her to the altar. The book was old, its binding cracked and weathered. No title marked its cover, only a symbol matching one of the spirals carved into the stone. As Rory reached for it, a whisper drifted through the clearing—not words, but a sound like dry leaves skittering across pavement. She snatched her hand back, scanning the darkness. "Who's there?" Her voice emerged stronger this time, carrying the edge she'd developed since leaving Cardiff and Evan behind. The whisper came again, from everywhere and nowhere. Rory fumbled in her pocket for her phone, switching on its flashlight. The beam seemed feeble, barely penetrating the unnatural darkness. She swept it around the clearing, illuminating nothing but trees and stones. Something darted between two oaks—a flash of movement too quick to identify. "I'm not afraid of you," she lied, backing toward the altar stone. "Show yourself." The Heartstone's heat seared against her skin now. She winced, pulling it away from her flesh. Its glow had intensified, casting bloody light across the altar and book. The whisper became a rustle, became a murmur, became words she almost understood. "What do you want from me?" Rory demanded, pressing her back against the stone, scanning the treeline. Her crescent-shaped scar itched beneath her sleeve—an old tell of rising panic she thought she'd overcome. Movement
flickered
at the corners of her vision, always vanishing when she
tried to
focus directly on it. Shapes slipping between trees. Shadows detaching from shadows. The book on the altar fell open of its own accord, pages flipping as if caught in a strong breeze before settling. The pendant tugged her toward it, a physical pull she couldn't resist. Rory leaned over, angling her phone to illuminate the pages. Elegant script filled the yellowed paper, but in no language she recognized. Yet as she stared at the incomprehensible symbols, they
seemed to
shift, rearrange, almost making sense before slipping back into nonsense. A name caught her eye—Malphora. The name from her dreams. The name the voice had called her. Something brushed against her ankle. Rory yelped, jerking away, but saw nothing at her feet. The touch came again at her shoulder, a feather-light caress that sent revulsion crawling down her spine. The whispers intensified, a dozen voices now, speaking over each other in that almost-language. Urgency colored their tones. "I don't understand," Rory said, her voice tight with fear. "What are you trying to tell me?" The pendant jerked
sharply
, yanking her down toward the book. As her face drew close to the page, the symbols swam into focus, resolving into a single sentence in English: *Time runs differently here. You must leave before midnight.* Rory's gaze snapped to her
watch
. 11:58 PM. Terror seized her, instinctive and primal. She slammed the book shut, backing away from the altar. The pendant's heat became unbearable, the stone glowing like a coal. The whispers rose to a crescendo. Shapes materialized at the edge of the clearing—tall, slender figures silhouetted against the deeper darkness of the trees. They moved with unnatural grace, drifting rather than walking. "Stay back!" Rory shouted, clutching the pendant despite its burning heat. "I'm leaving now!" She backed toward the standing stones marking the entrance, keeping her eyes on the approaching figures. Their forms
seemed to
waver and shift, sometimes appearing human, sometimes something altogether different. 11:59 PM. The Heartstone's pulse synchronized with her racing heartbeat. The figures closed in, their whispers now a keening wail that scraped against her eardrums. Rory turned and ran, sprinting for the standing stones. The air thickened further, her movements becoming sluggish as if running underwater. The distance to the stones stretched impossibly. Something cold and dry wrapped around her ankle. Rory stumbled, catching herself on her hands. She kicked frantically, not looking back, scrambling forward on all fours. The pendant swung free from her jacket, its light cutting through the darkness. Whatever had grabbed her recoiled with a hiss. Rory lunged for the gap between the standing stones, the boundary of the grove. Behind her, the wailing rose to a scream of frustration. She threw herself through the gap just as her
watch
chimed midnight. The world snapped back into focus. City sounds rushed in—a distant siren, the rumble of a late-night flight overhead, wind in the trees. Normal wind. Normal trees. Rory collapsed onto the damp grass, gasping for breath, the Heartstone cooling against her skin. Its glow faded to a faint ember. When she finally gathered herself enough to look back, the standing stones framed nothing but ordinary Richmond Park woodland. No clearing. No altar. No book. But as Rory pushed herself to her feet, she noticed something clutched in her left hand—a single page torn from a book, covered in elegant script. Most of the symbols remained indecipherable, but at the bottom, one phrase stood out clearly: *Return when you remember who you are, Malphora.* The crescent scar on her wrist
throbbed
in time with the pendant's pulse as Rory stared at her true name.
created_at
"2026-02-17T01:49:33.44715+00:00"
2/17/2026, 1:49:33 AM
model
"anthropic/claude-3-7-sonnet-20250219"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
388
moderation_latency
(null)
generation_time
40991
tokens_prompt
812
tokens_completion
2317
native_tokens_prompt
838
native_tokens_completion
2109
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
0.034149
router
(null)
provider_responses
0
id
"msg_01UuCj1a3LGLcW5nYxa334qj"
status
200
is_byok
false
latency
388
endpoint_id
"1347c8dc-12f5-47df-8355-3ec7e80a8c67"
provider_name
"Anthropic"
model_permaslug
"anthropic/claude-3-7-sonnet-20250219"
api_type
"completions"
id
"gen-1771292931-TU0D05uXSGB8AbqVOq9U"
upstream_id
"msg_01UuCj1a3LGLcW5nYxa334qj"
total_cost
0.034149
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
8
adverbTagCount
0
adverbTags
(empty)
93.1224%
AI-ism adverb frequency
Target: <1% AI-ism adverbs (57 tracked)
wordCount
1454
totalAiIsmAdverbs
1
found
0
adverb
"sharply"
count
1
highlights
0
"sharply"
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)
65.6121%
AI-ism word frequency
Target: <1% AI-ism words (140 tracked)
wordCount
1454
totalAiIsms
5
found
0
word
"luminous"
count
1
1
word
"lurching"
count
1
2
word
"throbbed"
count
1
3
word
"flickered"
count
1
4
word
"weight"
count
1
highlights
0
"luminous"
1
"lurching"
2
"throbbed"
3
"flickered"
4
"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
127
matches
(empty)
100.0000%
Filter word density
Target: ≤12% sentences with filter/hedge words
filterCount
3
hedgeCount
3
narrationSentences
127
filterMatches
0
"watch"
hedgeMatches
0
"tried to"
1
"seemed to"
100.0000%
Overuse of "that" (subordinate clause padding)
Target: ≤10% sentences with "that" clauses
thatCount
1
totalSentences
130
matches
0
"exist—that part"
100.0000%
Paragraph length variance
Target: CV ≥0.5 for paragraph word counts
totalParagraphs
62
mean
23.1
std
12.95
cv
0.561
sampleLengths
0
53
1
29
2
44
3
44
4
5
5
29
6
19
7
39
8
8
9
29
10
41
11
16
12
48
13
29
14
5
15
16
16
26
17
21
18
9
19
9
20
17
21
57
22
33
23
29
24
19
25
8
26
33
27
12
28
14
29
28
30
13
31
33
32
26
33
34
34
43
35
5
36
12
37
5
38
27
39
18
40
17
41
30
42
9
43
6
44
2
45
27
46
33
47
14
48
30
49
2
100.0000%
Passive voice overuse
Target: ≤5% passive sentences
passiveCount
0
totalSentences
127
matches
(empty)
100.0000%
Past progressive (was/were + -ing) overuse
Target: ≤10% past progressive verbs
pastProgressiveCount
1
totalVerbs
252
matches
0
"were waiting"
94.0000%
Purple prose (modifier overload)
Target: <4% adverbs, <2% -ly adverbs, no adj stacking
wordCount
1409
adjectiveStacks
1
stackExamples
0
"small leather-bound book"
adverbCount
41
adverbRatio
0.029098651525904896
lyAdverbCount
12
lyAdverbRatio
0.008516678495386799
100.0000%
Repeated phrase echo
Target: ≤20% sentences with echoes (window: 2)
totalSentences
130
echoCount
0
echoWords
(empty)
100.0000%
Sentence length variance
Target: CV ≥0.4 for sentence word counts
totalSentences
130
mean
11.02
std
6.28
cv
0.57
sampleLengths
0
16
1
21
2
16
3
14
4
15
5
11
6
2
7
3
8
14
9
14
10
13
11
31
12
5
13
5
14
13
15
11
16
8
17
11
18
8
19
18
20
13
21
8
22
10
23
4
24
15
25
14
26
27
27
16
28
5
29
17
30
26
31
9
32
9
33
3
34
8
35
5
36
6
37
10
38
10
39
2
40
3
41
11
42
5
43
16
44
9
45
9
46
17
47
28
48
29
49
7
53.5897%
Sentence opener variety
Target: ≥60% unique sentence openers
consecutiveRepeats
12
diversityRatio
0.3769230769230769
totalSentences
130
uniqueOpeners
49
0.0000%
Dialogue tag variety (said vs. fancy)
Target: ≤30% fancy dialogue tags
totalTags
8
fancyCount
6
fancyTags
0
"Rory whispered to herself, her breath clouding in the unseasonable chill (whisper cloud)"
1
"she muttered, using her surname as she did when steeling herself (mutter, use do steel)"
2
"she said, her voice sounding distant and small even to her own ears (say, sound)"
3
"she lied, backing toward the altar stone (lie, back)"
4
"demanded (demand)"
5
"shouted (shout)"
88.6073%