NC Bench
Overview
About
Tests
Models
Vendors
Run: 2026-02-17-01KHMMGN00JHYXV6GNS6WX9VE4
Run Details
Model:
Claude 3.7 Sonnet
Test:
Bad Writing Habits
Scenario:
Horror: alone in an eerie place at night
Duration:
43.5s
Cost:
$0.036699
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 taxi left Rory at Richmond Park's west entrance an hour after sunset, the driver giving her a strange look as she paid the fare. "Last pickup's at ten, miss. You sure about this?" "I'll manage." She slipped him an extra five pounds, not entirely certain she
was telling
the truth. The park gates stood partially open despite the late hour. Security lapse, perhaps. Rory tugged her jacket tighter as October wind clawed through the fabric. Her phone flashlight cast a
stark
white cone through the darkness as she followed the path, checking the hand-drawn map Eva had given her that morning. "It's not on any official trail," Eva had said, her eyes unnaturally bright. "But the grove holds answers, Rory. Trust me." Easy for Eva to say. She hadn't been the one hearing whispers from bathroom drains for the past week, or finding those strange symbols carved into her doorframe every morning despite changing the locks twice. The pendant beneath Rory's shirt warmed against her skin as she ventured deeper into the park. She'd started wearing it constantly since finding it in a small unmarked package three days ago. The crimson stone had
seemed to
call to her somehow, and in the midst of everything else happening, wearing it felt right. Necessary, even. Twenty minutes of walking brought her to the fork Eva had marked. Rory left the main path, following a barely visible deer trail that wound between ancient oaks. The stone pulsed warmer, the chain
suddenly
hot against her neck. "Right," she muttered. "I'm definitely going the right way, then." The tree line parted ahead, revealing what looked like weathered stone pillars. As she approached, Rory realized they weren't pillars at all but impossibly ancient oak trunks, their bark hardened to stone-like density, arranged in a rough circle. The pendant burned against her skin. This had to be the place. Stepping between two of the standing oak-stones, Rory entered the grove. Inside, the air changed. The October chill vanished, replaced by the gentle warmth of late spring. Wildflowers carpeted the ground—foxglove, bluebells, and others she couldn't name—blooming impossibly in the darkness. The flashlight beam seemed dimmer here, struggling against the peculiar quality of the shadows. "Hello?" Her voice sounded muffled, as if the air itself swallowed sound. No response. Just the faint rustling of leaves in a breeze she couldn't feel. She checked her
watch
: 7:42 PM. Plenty of time before the last taxi. The grove was roughly circular, perhaps fifty feet across. At its center stood a flat stone table, its surface worn smooth by time, surrounded by more wildflowers than anywhere else. Rory approached it
slowly
, the Heartstone pendant now uncomfortably hot against her skin. Eva's instructions had been specific: place the pendant on the stone table at moonrise and wait. The answers would come. Except the instructions hadn't mentioned the crawling sensation up her spine, the feeling of being
watch
ed from every direction at once. A twig snapped behind her. Rory whirled, flashlight beam cutting through darkness, but illuminated nothing except flowers and trees. "Someone there?" Her voice sounded steadier than she felt. Another sound, like
footsteps
, this time from her left. Again, she turned to find nothing. Pulling the pendant from beneath her shirt, Rory studied it in her palm. The crimson stone pulsed with inner light now, its glow casting her hand in blood-red shadows. "Eva, what did you get me into?" The stone table beckoned. Rory approached it, noting strange markings carved into its edge—similar to the ones that had been appearing on her doorframe. She placed the pendant
carefully
on the center of the table. Nothing happened. Rory checked her
watch
again: 7:47 PM. She glanced up at the sky visible through the trees. No moon yet. She'd have to wait. Another sound, this time like whispering. Rory turned
slowly
, scanning the tree line with her flashlight. The beam seemed weaker now, barely penetrating the first row of trees. "I know someone's there," she called, the tremor in her voice betraying her. "Show yourself." The whispering stopped. Minutes crawled by in silence. Her
watch
read 7:53 PM when she checked it again, though it felt like much longer. The grove's unnatural warmth had taken on a cloying quality, like standing too close to a stranger on a summer day. She glanced at the pendant, still sitting inert on the stone table. Its inner glow had dimmed. "This is ridiculous," she muttered, reaching for it. Something moved at the edge of her vision—a flash of pale fabric, or perhaps a face—gone before she could turn fully toward it. Her
heart hammered in her chest
. "Who's there?" The words barely made it past her tight throat. The wildflowers
trembled
, though there was no wind. Rory took a step back from the table,
suddenly
wanting nothing more than to leave this place. The pendant could stay here forever for all she cared. But when she turned toward the oak-stone entrance, she couldn't find it. The circle of ancient trees looked uniform now, no gap visible anywhere. "No," she whispered. "No, no, no." She rushed to the tree line, searching frantically for the opening she'd come through. The oak trunks stood shoulder-to-shoulder, their bark cold and unyielding beneath her palms as she pushed against them. Her
watch
read 7:56 PM when she checked it again. Four minutes until moonrise, according to Eva's notes. Rory returned to the stone table, pulse thundering in her ears. The pendant's glow had strengthened again, pulses of crimson light bleeding into the air around it. A sound behind her—the unmistakable intake of breath, close enough that she should feel it on her neck. Rory spun, flashlight raised like a weapon. Nothing. But the stone table had changed. Liquid—dark and viscous in the dim light—pooled around the pendant, spreading outward in a perfect circle. Rory stared, frozen in place. It wasn't possible. She'd only looked away for a second. The liquid reached the edge of the table and
began to
drip onto the wildflowers below, which withered and blackened at its touch. She backed away, only to collide with something solid where nothing had been before. Rory closed her eyes, terror seizing her chest. She felt hot breath against her ear, the brush of fabric against her hand. "You shouldn't have come alone," whispered a voice—familiar somehow, but twisted, like hearing her own voice played back with the pitch altered. She opened her eyes and whirled around. A figure stood there, face hidden in shadow despite the flashlight beam pointing directly at it. It wore what looked like Rory's own jacket, her own jeans. "Who are you?" she demanded, voice breaking. The figure tilted its head, the movement unnaturally fluid. "Don't you recognize me, Rory?" It stepped forward into the light, and Rory's breath caught in her throat. It was her own face looking back at her, but wrong—eyes too dark, smile too wide, skin too pale. "What are you?" she whispered. "I'm what waits between," her doppelganger replied. "And you opened the door." Rory backed away, glancing frantically at the pendant. Its crimson glow had intensified, illuminating the entire stone table now slick with dark liquid. Her
watch
read 8:00 PM exactly. Moonlight
suddenly
flooded the grove as if a curtain had
been pulled
back, illuminating everything in silver. The standing oak-stones
began to
hum, a low vibration Rory felt in her bones. Her duplicate smiled wider, teeth
gleaming
too white, too sharp. "The moon rises," it said in Rory's voice. "And the doors open." The pendant rose from the table, hovering in the air, spinning
slowly
. The dark liquid
began to
spiral beneath it, forming a perfect whirlpool that somehow went down, impossibly down through solid stone. "Eva sent you here as payment," her double said conversationally, stepping closer. "She owes a debt. You're how she pays it." Rory's back hit one of the oak-stones. The small crescent scar on her left wrist burned
suddenly
, as if freshly cut. "That's not true," she said, though doubt crept in. Eva had been acting strangely for weeks. "She wouldn't." Her double laughed, the sound
echoing
unnaturally in the grove. "Friends betray. It's what they do. Evan taught you that, didn't he?" The name sent ice through Rory's veins. "How do you—" "I know everything about you, Aurora Carter." The thing with her face was inches away now. "Including how to wear you." The pendant spun faster, its glow intensifying until it hurt to look at. The whirlpool beneath it widened, the dark liquid somehow flowing upward now, defying gravity. Rory's
watch
stopped at 8:01 PM, the hands spinning backwards. She looked into her own twisted face and saw something ancient looking back, something that had never been human. "The heartstone opens the way," it whispered. "And you, dear Rory, are the key." The pendant shattered with a sound like breaking glass, fragments of crimson crystal suspended in midair. The grove plunged into darkness, her flashlight dead, even the moonlight extinguished. In the perfect blackness, Rory felt cold fingers close around her wrist, directly over her childhood scar. And she
began to
scream.
created_at
"2026-02-17T01:48:37.456043+00:00"
2/17/2026, 1:48:37 AM
model
"anthropic/claude-3-7-sonnet-20250219"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
393
moderation_latency
(null)
generation_time
43410
tokens_prompt
812
tokens_completion
2441
native_tokens_prompt
838
native_tokens_completion
2279
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
0.036699
router
(null)
provider_responses
0
id
"msg_016vNDg4YXUhaJm3ZBxD3eAr"
status
200
is_byok
false
latency
393
endpoint_id
"1347c8dc-12f5-47df-8355-3ec7e80a8c67"
provider_name
"Anthropic"
model_permaslug
"anthropic/claude-3-7-sonnet-20250219"
api_type
"completions"
id
"gen-1771292873-XJQ3YLLbbuPqljQjUPlb"
upstream_id
"msg_016vNDg4YXUhaJm3ZBxD3eAr"
total_cost
0.036699
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Anthropic"
Evaluation details
Result
Evaluator
Details
Meta Data
56.4103%
Adverbs in dialogue tags
Target: ≤10% dialogue tags with adverbs
totalTags
13
adverbTagCount
3
adverbTags
0
"Eva had said, her eyes unnaturally bright [unnaturally]"
1
"whispered a voice—familiar somehow, but twisted, like hearing her own voice played back with the pitch altered [somehow, back]"
2
"her double said conversationally, stepping closer [conversationally]"
48.0519%
AI-ism adverb frequency
Target: <1% AI-ism adverbs (57 tracked)
wordCount
1540
totalAiIsmAdverbs
8
found
0
adverb
"carefully"
count
1
1
adverb
"slowly"
count
3
2
adverb
"suddenly"
count
4
highlights
0
"carefully"
1
"slowly"
2
"suddenly"
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)
67.5325%
AI-ism word frequency
Target: <1% AI-ism words (140 tracked)
wordCount
1540
totalAiIsms
5
found
0
word
"gleaming"
count
1
1
word
"trembled"
count
1
2
word
"stark"
count
1
3
word
"footsteps"
count
1
4
word
"echoing"
count
1
highlights
0
"gleaming"
1
"trembled"
2
"stark"
3
"footsteps"
4
"echoing"
100.0000%
Cliche density
Target: ≤1 cliche(s) per 800-word window
totalCliches
1
maxInWindow
1
found
0
label
"heart pounded in chest"
count
1
highlights
0
"heart hammered in her chest"
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
6
hedgeCount
5
narrationSentences
126
filterMatches
0
"watch"
hedgeMatches
0
"seemed to"
1
"began to"
100.0000%
Overuse of "that" (subordinate clause padding)
Target: ≤10% sentences with "that" clauses
thatCount
0
totalSentences
141
matches
(empty)
100.0000%
Paragraph length variance
Target: CV ≥0.5 for paragraph word counts
totalParagraphs
77
mean
19.77
std
12.41
cv
0.628
sampleLengths
0
34
1
17
2
51
3
21
4
35
5
56
6
39
7
10
8
44
9
6
10
11
11
44
12
12
13
14
14
13
15
43
16
41
17
5
18
14
19
9
20
15
21
29
22
7
23
35
24
2
25
7
26
17
27
28
28
15
29
3
30
42
31
17
32
8
33
29
34
11
35
35
36
24
37
6
38
32
39
10
40
8
41
27
42
18
43
7
44
1
45
22
46
15
47
23
48
14
49
22
100.0000%
Passive voice overuse
Target: ≤5% passive sentences
passiveCount
1
totalSentences
126
matches
0
"been pulled"
100.0000%
Past progressive (was/were + -ing) overuse
Target: ≤10% past progressive verbs
pastProgressiveCount
1
totalVerbs
234
matches
0
"was telling"
82.2023%
Purple prose (modifier overload)
Target: <4% adverbs, <2% -ly adverbs, no adj stacking
wordCount
1391
adjectiveStacks
0
stackExamples
(empty)
adverbCount
79
adverbRatio
0.056793673616103525
lyAdverbCount
33
lyAdverbRatio
0.02372393961179008
100.0000%
Repeated phrase echo
Target: ≤20% sentences with echoes (window: 2)
totalSentences
141
echoCount
0
echoWords
(empty)
100.0000%
Sentence length variance
Target: CV ≥0.4 for sentence word counts
totalSentences
141
mean
10.79
std
5.92
cv
0.548
sampleLengths
0
25
1
9
2
17
3
10
4
3
5
12
6
26
7
13
8
8
9
5
10
30
11
16
12
16
13
22
14
2
15
12
16
16
17
11
18
3
19
7
20
12
21
26
22
6
23
6
24
11
25
4
26
12
27
14
28
14
29
12
30
2
31
12
32
6
33
7
34
9
35
21
36
13
37
16
38
4
39
21
40
5
41
14
42
9
43
9
44
6
45
13
46
16
47
7
48
4
49
20
53.1915%
Sentence opener variety
Target: ≥60% unique sentence openers
consecutiveRepeats
5
diversityRatio
0.3404255319148936
totalSentences
141
uniqueOpeners
48
0.0000%
Dialogue tag variety (said vs. fancy)
Target: ≤30% fancy dialogue tags
totalTags
13
fancyCount
10
fancyTags
0
"she muttered (mutter)"
1
"she called, the tremor in her voice betraying her (call, betray)"
2
"she muttered, reaching for it (mutter, reach)"
3
"she whispered (whisper)"
4
"whispered a voice—familiar somehow, but twisted, like hearing her own voice played back with the pitch altered (whisper like hearing play alter)"
5
"demanded (demand)"
6
"whispered (whisper)"
7
"her double said conversationally, stepping closer (step)"
8
"she said, though doubt crept in (say, creep in)"
9
"it whispered (whisper)"
82.7876%