NC Bench
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Run: 2026-02-17-01KHMRBFV2T8ZN29VCAQTNCXY7
Run Details
Model:
o4 Mini
Test:
Bad Writing Habits
Scenario:
Horror: alone in an eerie place at night
Duration:
20.4s
Cost:
$0.013110
Provider:
OpenAI
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
Aurora Carter paused at the rim of the clearing, the ancient oaks arching overhead like silent
sentinels
. Midnight draped itself across the Grove in an inky cloak, thick and unbroken, but for the faint glimmer of her Heartstone Pendant resting against her chest. The deep crimson gem pulsed beneath her fingers, a warm heartbeat in the chill air. She let out a slow breath, glancing down at the silver chain that glittered in the darkness. She had come tonight to find the portal. She had to be sure it was real. She stepped forward, boots sinking into damp moss. The world
seemed to
hush behind her, as if the Grove inhaled her e
very
footstep. In the distance, fireflies wove slow spirals among the wildflowers that bloomed riotously, petals shining silver in the moon’s faint glow. Their soft light painted ghostly patterns across her bright blue eyes. She ran a hand along the crease of her straight black hair, brushing it behind her ear, then flexed her wrist where the small crescent–shaped scar lay. The spot tingled as if warning her to turn back. She forced herself deeper into the clearing. Time here refused her normal rules. From the moment she set foot inside the circle of standing stones, minutes expanded into hours—hours folded into strange moments uncounted by any mortal clock. She glanced at her phone: fifteen minutes, it said. Behind her, the shadows beneath the oaks had shifted, slender silhouettes now crowding the edges where none should stand. A leaf
quivered
. She stopped. Listened. Nothing—except a faint rustle that could have been her imagination. She
tried to
steady her heart. She needed the pendant to guide her. She held it up; its inner glow flared, painting her face in sanguine light. She hoped it would lead her to the Hel portal, the one rumored to open just beyond this pocket of Fae-touched earth. A distant sound drifted through the trees—whispered laughter, high and lilting, like children playing just out of sight. Her
blood ran cold
. She thought of Eva’s warnings: “Nobody goes in alone, Rory.” But this had to be done alone. If she failed, if she showed weakness… She swallowed. “It’s just the wind,” she whispered. The words tasted bitter. She advanced toward the standing stones, their gnarled oak frames carved with runes no human tongue could speak. She could feel their ancient power thrumming beneath her boots. The pendant’s warmth grew, pulsing against her palm, urging her forward. She circled one stone until the silver light of the Heartstone illuminated a hairline crack, a
perfectly
straight fissure that glowed faintly green. Hel magic, she thought. The portal must be close. Something moved behind her, flickering at the edge of her vision. She spun, raising the pendant like a lantern. The glow revealed nothing but the empty tangle of roots and wildflowers. She inhaled
sharply
, her pulse pounding in her ears. The Grove felt alive—watching, waiting. The laughter came again, closer now, but still no child, no creature to
own that voice
. It
echo
ed in the hush, ricocheting off the oaks. Aurora forced herself to step forward again, tracing the line of boundary stones with her fingertips. Each time her skin brushed the oak, a shiver ran up her arm, as though the tree itself tested her presence. She
tried to
recall the map in her mind: three steps north of the northernmost stone, then turn east until the ground fell away into darkness. But the map had
been drawn
by mortal hands. This place reshaped itself. She took a step—only to find the
very
same stone before her. She turned and the path behind had vanished, swallowed by brambles that
seemed to
have grown in the last heartbeat. Her breath caught. She backed away, hand tight on the pendant, and colliding with something solid—a low wall of earth. She stumbled, scraping the scarred wrist on a hidden root. Pain flared, bright and sharp. She hissed, pulling her arm free and pressing the scar. The pendant fell, spinning through the air before landing on the moss with a soft click. It pulsed frightfully fast, warmth blazing across the clearing, as though alarmed at her fall. The laughter stopped. Silence pressed in around her, thick as fog. She crawled forward to retrieve the Heartstone. Craning her neck, she saw it safe, its crimson glow a
beacon
in the gloom. She reached out—then froze. Across the clearing, a shape pressed against one of the standing stones, exactly the same color and texture as the bark. She couldn’t move. The figure’s head tilted, two pale slits where eyes should have been. It watched her. She tasted copper on her tongue. Instinct screamed at her to run, but her legs
trembled
, rooted to the spot. The pendant pulsed again, warm and insistent in her palm. She clutched it to her chest, summoned a sliver of courage. “Who’s there?” she called. Her voice sounded thin, brittle. No answer. The thing remained, motionless. She let her shoulders drop, exhaled. She had to keep going. She could not let fear steal this chance. She stood, brushing moss from her knees, and moved past the figure—only to find the ground opening up in front of her. A shallow pit, rimmed with white fungus that pulsed faintly, like a heartbeat half-remembered. Her breath caught again. The pendant grew heavier, hotter. A faint humming drifted up from the pit, low and insistent. A rift. Was this the portal? It fit the stories—an underground fissure, edged with
otherworldly
growth. She leaned closer. The humming grew louder, as if filling her head with a single, unbroken note. Then, from the darkness behind her, a voice: soft and coaxing, drenched in honeyed tones. “Aurora…” It called her full name, stretching the syllables until each
seemed to
echo
in her skull. She whirled, eyes wide, but nothing stood behind her. The voice sounded so near, so intimate, she could almost believe it whispered from her own skin. “Stay with us,” it breathed. The breeze shifted; blossoms unfurled, petals brushing against her cheek like soft kisses. She tugged at the pendant, willing it to guide her back to reason. The voice trailed off and the blossoms snapped closed, looping away in the darkness. She stumbled back from the pit, pressing her palm to the glowing gem. Warmth spread through her chest, anchoring her. She forced herself to count steps, to map the clearing in her mind, to find the path home. But the Grove had other plans. The standing stones reorganized themselves, tilting inward, narrowing her escape. The moon slipped behind a cloud, and the air turned
suddenly
colder—sharp enough to steal her breath. The voice called again, gentler this time. “Rory…” She crumpled to her knees, head spinning, tears brimming. She was alone. She had been alone from the moment she stepped past the boundary. No portal, no map, only whispered promises and the endless watching of the unseen. She pressed the pendant to her lips. “Help me,” she whispered, because there was nothing else to say. The gem pulsed once, twice, then glowed steady, bright enough to cast iron-black shadows among the roots. In that light she saw them: slender silhouettes perched in the branches, eyes
gleaming
like wet obsidian. Their limbs bent at angles impossible for any human joint. They tilted their heads, studying her with hungry curiosity. She scrambled backward, stumbling over a tuft of wildflowers. They
shimmered
, reflected in dozens of tiny eyes. Behind her, the runes on the nearest standing stone glowed a sickly green. Shapes coalesced in the carved grooves: twisting faces, mouths open in silent screams. The pendant grew oppressively hot. She yanked it free of its chain, clutched it to her palm like a talisman. She would break it if she had to. She would do anything to make the voices stop. A twig snapped close by. She looked up. One of the creatures had dropped to the ground, landing with a soft, unnatural padding. It crept toward her, joints bending backward, head lolling. She backed up, heart hammering against her ribs. The creature paused a foot away, its face half-shrouded in shadow. It lifted a finger—too many joints, too long—and pointed at her scar, tracing the crescent shape with a translucent fingertip. She screamed and bolted, tearing past the standing stones. The path she ran felt familiar and then not—the trees bent inward, blocking her way. The wildflowers pressed in on either side, petals brushing her arms, watering her cheeks with dew. She pushed through and emerged at last into the boundary circle, panting, the pendant heel-pulsing warm in her fist. The grove fell behind her, the oaks arching like doors closing. She stumbled across the grass of Richmond Park, the night air fresh, the portal lost to time’s crooked rules. She kept running until the pendant’s glow faded to a pale ember, until the whispers dissolved into the wind, until the Grove felt nothing more than a distant
echo
. Only then did she stop, her chest heaving, fingers white with the silver chain, and realize how close she had come to turning forever into shadow beneath those ancient oaks.
created_at
"2026-02-17T02:55:19.873164+00:00"
2/17/2026, 2:55:19 AM
model
"openai/o4-mini-2025-04-16"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
3287
moderation_latency
(null)
generation_time
20132
tokens_prompt
812
tokens_completion
2860
native_tokens_prompt
742
native_tokens_completion
2794
native_tokens_completion_images
0
native_tokens_reasoning
768
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
"completed"
usage
0.0131098
router
(null)
provider_responses
0
id
"resp_07fde0d6cc333bbf016993d882fe148193a087bd17528b364b"
status
200
is_byok
false
latency
122
endpoint_id
"bd121898-b27c-4e2c-bc92-278627465a54"
provider_name
"OpenAI"
model_permaslug
"openai/o4-mini-2025-04-16"
api_type
"completions"
id
"gen-1771296898-ETXbLPdZyBJhukHEiZzt"
upstream_id
"resp_07fde0d6cc333bbf016993d882fe148193a087bd17528b364b"
total_cost
0.0131098
cache_discount
(null)
upstream_inference_cost
0
provider_name
"OpenAI"
Evaluation details
Result
Evaluator
Details
Meta Data
100.0000%
Adverbs in dialogue tags
Target: ≤10% dialogue tags with adverbs
totalTags
5
adverbTagCount
0
adverbTags
(empty)
74.1100%
AI-ism adverb frequency
Target: <1% AI-ism adverbs (57 tracked)
wordCount
1545
totalAiIsmAdverbs
4
found
0
adverb
"perfectly"
count
1
1
adverb
"sharply"
count
1
2
adverb
"suddenly"
count
1
3
adverb
"very"
count
1
highlights
0
"perfectly"
1
"sharply"
2
"suddenly"
3
"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)
35.2751%
AI-ism word frequency
Target: <1% AI-ism words (140 tracked)
wordCount
1545
totalAiIsms
10
found
0
word
"beacon"
count
1
1
word
"sentinels"
count
1
2
word
"shimmered"
count
1
3
word
"gleaming"
count
1
4
word
"trembled"
count
1
5
word
"quivered"
count
1
6
word
"otherworldly"
count
1
7
word
"echo"
count
2
8
word
"echoed"
count
1
highlights
0
"beacon"
1
"sentinels"
2
"shimmered"
3
"gleaming"
4
"trembled"
5
"quivered"
6
"otherworldly"
7
"echo"
8
"echoed"
100.0000%
Cliche density
Target: ≤1 cliche(s) per 800-word window
totalCliches
1
maxInWindow
1
found
0
label
"blood ran cold"
count
1
highlights
0
"blood ran cold"
100.0000%
Emotion telling (show vs. tell)
Target: ≤3% sentences with emotion telling
emotionTells
0
narrationSentences
137
matches
(empty)
100.0000%
Filter word density
Target: ≤12% sentences with filter/hedge words
filterCount
0
hedgeCount
5
narrationSentences
137
filterMatches
(empty)
hedgeMatches
0
"seemed to"
1
"tried to"
100.0000%
Overuse of "that" (subordinate clause padding)
Target: ≤10% sentences with "that" clauses
thatCount
1
totalSentences
137
matches
0
"own that voice"
18.2577%
Paragraph length variance
Target: CV ≥0.5 for paragraph word counts
totalParagraphs
21
mean
72.71
std
15.55
cv
0.214
sampleLengths
0
91
1
99
2
59
3
65
4
58
5
71
6
70
7
108
8
76
9
96
10
55
11
89
12
58
13
45
14
71
15
64
16
70
17
63
18
71
19
70
20
78
100.0000%
Passive voice overuse
Target: ≤5% passive sentences
passiveCount
1
totalSentences
137
matches
0
"been drawn"
100.0000%
Past progressive (was/were + -ing) overuse
Target: ≤10% past progressive verbs
pastProgressiveCount
0
totalVerbs
295
matches
(empty)
100.0000%
Purple prose (modifier overload)
Target: <4% adverbs, <2% -ly adverbs, no adj stacking
wordCount
1527
adjectiveStacks
0
stackExamples
(empty)
adverbCount
54
adverbRatio
0.03536345776031434
lyAdverbCount
16
lyAdverbRatio
0.010478061558611657
100.0000%
Repeated phrase echo
Target: ≤20% sentences with echoes (window: 2)
totalSentences
137
echoCount
0
echoWords
(empty)
100.0000%
Sentence length variance
Target: CV ≥0.4 for sentence word counts
totalSentences
137
mean
11.15
std
6.33
cv
0.568
sampleLengths
0
17
1
26
2
15
3
17
4
8
5
8
6
8
7
15
8
21
9
11
10
27
11
10
12
7
13
6
14
25
15
9
16
19
17
3
18
2
19
1
20
10
21
6
22
7
23
14
24
22
25
18
26
4
27
17
28
7
29
2
30
6
31
4
32
18
33
10
34
11
35
23
36
4
37
5
38
11
39
8
40
12
41
9
42
5
43
16
44
9
45
16
46
21
47
26
48
9
49
4
34.6715%
Sentence opener variety
Target: ≥60% unique sentence openers
consecutiveRepeats
21
diversityRatio
0.27007299270072993
totalSentences
137
uniqueOpeners
37
25.0000%
Dialogue tag variety (said vs. fancy)
Target: ≤30% fancy dialogue tags
totalTags
5
fancyCount
3
fancyTags
0
"she whispered (whisper)"
1
"it breathed (breathe)"
2
"she whispered, because there was nothing else to say (whisper, be say)"
81.6067%