NC Bench
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Run: 2026-02-17-01KHMQSZ159JVMEEX12J9BYZNH
Run Details
Model:
Claude Opus 4.6
Test:
Bad Writing Habits
Scenario:
Fantasy: entering an ancient ruin
Duration:
1m 6s
Cost:
$0.070765
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> <character id="4418" name="Nyx" aliases="Nyx, the Shadow, Nightwhisper" pronouns="they/them" species="Shade" storyRole="Wild Card"> <eyeColor>faintly glowing violet</eyeColor> <height>approximately 6'2" in solid form</height> <age>ageless</age> <form>humanoid silhouette of living shadow, can shift between solid and incorporeal</form> <voice>sounds like a whisper carried on the wind</voice> <description>A being of living shadow, existing between the mortal plane and the spaces between realms.</description> <backstory>Nyx was once a human sorcerer named Aldric who became trapped between realms during a failed summoning ritual in 1643. They now exist as a Shade, bound to the mortal plane but able to slip between shadows.</backstory> </character> <character id="4424" name="Isolde Varga" aliases="Isolde, the Seer" pronouns="she/her" species="Half-Fae" storyRole="Oracle"> <eyeColor>pale lavender</eyeColor> <hair>silver, reaching her waist</hair> <height>5'5"</height> <age>300 years old</age> <appearance>ethereal, ageless</appearance> <speech>speaks in riddles</speech> <footprints>leaves no footprints when she walks</footprints> <compulsion>cannot lie (Fae compulsion) but can mislead</compulsion> <description>A Half-Fae seer exiled from the Fae Courts for sharing visions with mortals.</description> <backstory>She now lives in a hidden grove in Richmond Park, offering cryptic prophecies to those who seek her out.</backstory> </character> <location id="853" name="Dymas (Gluttony)" aliases="Dymas, gluttony, Dymasian" realm="Hel" sin="Gluttony"> <ruler>Prince Belphegor</ruler> <skyColor>warm amber</skyColor> <description>A place of excess and indulgence. Sprawling vineyards, orchards, and gardens provide exotic ingredients for master chefs — often helbound souls contracted from Earth. Grand feasts and culinary competitions are common.</description> </location> <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> <item id="2006" name="Fae-Forged Blade" aliases="the Fae blade, Isolde's gift" type="Weapon" origin="The Fae Courts"> <material>moonsilver</material> <shape>slender, leaf-shaped dagger</shape> <temperature>always cold to the touch</temperature> <glow>faintly luminescent in moonlight</glow> <power>can cut through magical wards; particularly effective against demons</power> <givenTo>given to Aurora by Isolde as a gift</givenTo> <description>A weapon of the Fae Courts, rare and highly coveted.</description> </item> <lore id="7001" name="The Veil" aliases="the Veil, the Barrier, the Boundary" category="Cosmology"> <solsticeEffect>weakens during the winter solstice, strengthens during the summer solstice</solsticeEffect> <appearance>faint shimmering distortion visible only to those with supernatural sight</appearance> <monitoring>rift points (tears in the Veil) are monitored by the Wardens</monitoring> <description>The Veil is the metaphysical barrier separating Earth from Hel and the Fae Realms.</description> </lore> </codex> Write a fully fleshed out scene of at least 1000 words in the fantasy genre. A small group enters an ancient, otherworldly place for the first time. The environment is alien and wondrous. Describe their exploration — what they see, hear, and feel as they move deeper. Include moments of discovery, unease, and wonder. Let the world-building emerge through the characters' experience rather than exposition. Use the codex entries above as your world reference for characters, setting, and lore. Only include the prose of the scene without any markdown or commentary.
Model response
Messages
Meta
AI
The air changed the moment they stepped through. Rory felt it first in her lungs—a warmth that tasted of honey and overripe fruit, sweet enough to make her teeth ache. The shimmer they'd passed through, that faint distortion Nyx had found folded into the shadows beneath Waterloo Bridge, sealed itself behind them with a sound like a sigh. She turned to look. Nothing but a wall of amber light, seamless and vast, stretching upward into a sky that had no business
being that color
. "It's warm," she said, stupidly. She'd expected Hel to be cold. Or hot in the fire-and-brimstone way her mother's Sunday school lessons had always promised. Not this—not a sky the color of late afternoon sun filtered through a jar of marmalade, not a breeze that carried the scent of roasting meat and cardamom and something darker underneath, something fermented and rich. "Dymas," Nyx whispered. Their voice was what it always was—wind through a cracked window—but here it sounded thinner, stretched. Rory glanced at them. In the amber light, Nyx's form seemed more solid than she'd ever seen it, the edges of their silhouette sharper, their violet eyes burning brighter against the living shadow of their body. They stood
very
still, and if a
being made
of darkness could look afraid, they did. "I had hoped she was wrong." Isolde had not been wrong. She was never wrong, exactly. She just made you wish she had been. Rory's hand went to the pendant at her throat. The Heartstone pulsed against her collarbone, warm and steady as a second heartbeat. It had been doing that since they'd approached the rift point—gentle at first, then insistent, a drumbeat pulling her forward. Now it seemed satisfied, its rhythm settling into something almost smug. She wanted to rip it off. "Don't," Nyx said, catching the movement. "It's the only thing marking you as something other than a meal in this place." "Comforting." She let her hand drop. They stood on a ridge overlooking a valley that shouldn't have been possible. It rolled out beneath them like something from a fever dream painted by a Renaissance master who'd lost his mind—terraced vineyards
cascading
down hillsides of dark soil, the vines heavy with fruit in colors she had no names for. Not purple, not red, not gold, but something that existed in the spaces between those colors, shifting when she
tried to
focus. Orchards dotted the middle distance, their trees enormous, gnarled, hung with lanterns that burned without flame. And beyond them, far below and sprawling across the valley floor, a city. No—not a city. A market. A feast. A living, breathing monument to appetite. Long tables stretched between pavilions of draped
silk
, laden with platters and tureens and towers of food so elaborate they looked architectural. Figures moved between them—some humanoid, some decidedly not. She could hear them from here, even at this distance: laughter, the clatter of cutlery, music played on instruments that produced sounds just
slightly
off from anything she'd heard before, as though someone had taken a violin and a human voice and braided them together. "We need to move," Nyx said. "Standing on a ridgeline in Dymas is an invitation." "An invitation to what?" "Dinner." They paused. "As the main course." Rory pulled the Fae-forged blade from where she'd tucked it into her belt, the leaf-shaped dagger catching the amber light with a reluctant gleam. Moonsilver. It was always cold in her hand, cold enough to ground her, to remind her that she was real and solid and mortal in a place that seemed designed to make her forget all three. Isolde had pressed it into her palm that morning in the Grove, her lavender eyes distant with something that might have been pity. "The blade will cut what the blade must cut," the Seer had said, which was
precisely
the kind of unhelpful thing Isolde always said. Then she'd added, quieter: "Do not eat anything, Aurora. Not a seed. Not a crumb. Not a single drop." Rory gripped the hilt and started down the slope. The soil was soft beneath her boots, darker than any earth she'd seen, almost black, and warm. Living warmth, as though something pulsed beneath the surface. The vineyard rows closed around them
quickly
, the vines thicker than her arm, coiling around trellises made of some pale bone-like material she chose not to examine too closely. The fruit hanging in heavy clusters gave off a scent that hit her like a physical thing—sweet and complex, layered with notes she could almost taste on the air alone. Her mouth watered. Her stomach, empty since that morning, clenched with a hunger so sudden and sharp it made her stumble. "Keep walking," Nyx said from somewhere to her left. They
were doing
that thing they did—sliding between the shadows cast by the vine rows, their form flickering in and out of visibility like a skipped frame in a film reel. "The vineyards are designed to do that. Dymasian agriculture is an art form. The fruit doesn't just appeal to hunger. It creates it." "You could have mentioned that before we walked into one." "I could have. But you needed to feel it to guard against it." She gritted her teeth and pushed forward. The Heartstone pulsed, and she
tried to
match her breathing to its rhythm—in and out, steady, real. The hunger receded to a dull roar. It didn't leave. They emerged from the vineyard onto a path of crushed stone that wound downhill toward the first of the orchards. Here the trees were massive, their canopies spreading wide and dense, leaves in a deep emerald that
seemed to
drink the amber light and give back something richer. She could see the fruit now—globes the size of grapefruits, their skins translucent, revealing the flesh inside in swirls of color like trapped sunlight. One hung low enough to brush her shoulder as she passed. The skin was warm and it hummed, the faintest vibration, as though something inside it was alive. She jerked away. "Good instincts," Nyx murmured. A sound reached them from further down the path. Not the distant revelry of the feast-market, but something closer—rhythmic, deliberate. Chopping. The steady thock-thock-thock of a blade meeting a cutting board. They rounded a bend and found a clearing. A broad stone table sat at its center, rough-hewn and ancient, stained with the evidence of ten thousand meals. Behind it stood a figure—human, or close enough. A man, thick-armed and sweating despite the pleasant warmth, wearing a stained leather apron. His hands moved with mechanical precision, reducing a pile of unfamiliar vegetables into perfect brunoise. He didn't look up. "You'll want to keep to the left fork," he said. His accent was Northern. Manchester, maybe. "The right takes you straight into the competition grounds. They'll have you peeling something before you can say your own name." Rory stopped. "You're human." "Was." Thock-thock-thock. "Still am, depending on who you ask and what you mean by it." He glanced up, finally. His eyes were ordinary brown, tired, and
very
old in a face that looked no more than forty. "Helbound. Sous chef to Belphegor's third kitchen. Twenty-seven years left on my contract." He looked at the blade in her hand, then at the pendant at her throat, then at the space where Nyx
flickered
in and out of the shadows. His expression didn't change. "You lot aren't supposed to be here." "We're looking for something," Rory said. "E
very
one in Dymas is looking for something. Usually it's the next meal." He set down his knife—a massive thing, well-used and lovingly maintained—and wiped his hands on his apron. "That pendant. Where did you get it?" The Heartstone pulsed, harder now, almost urgent. She covered it with her hand. "I don't know." The chef studied her for a long moment. Something shifted in his expression—not recognition, exactly, but a kind of grim understanding. "Left fork," he said again, picking up his knife. "And when you reach the fountain at the crossroads, don't drink from it. Don't touch the water. Don't even look at it for too long." "What happens if we do?" "You forget what you came for. And then you're hungry. And then—" He brought the knife down. Thock. "—you're one of us." Rory nodded, once. "Thank you." He was already cutting again, his eyes fixed on the board, his movements precise and endless. She wondered how many travelers he'd warned. She wondered how many had listened. They took the left fork. The path descended into a grove of trees older than the others, their trunks twisted into shapes that suggested faces, limbs, reaching hands. The lanterns here burned a deeper amber, almost red, and the shadows they cast were long and strange. Nyx moved closer to her, their form compacting into something almost fully solid, a tall dark figure at her shoulder. "This place remembers," they said
softly
. "Remembers what?" "E
very
thing anyone has ever wanted." A pause, and when they spoke again, their wind-whisper voice carried something ancient and raw. "I have been between realms for nearly four hundred years. I have slipped through shadows in places mortals cannot name. But I have never been here. Aldric—" They stopped. The name
hung in the air
, unexpected, and Rory knew without
being told
that it was the first time they had spoken it in a
very
long time. "The man I was would have been destroyed by this place. It feeds on want, Aurora. E
very
kind." She looked at them—
really
looked, past the shadow and the violet eyes, to whatever remained underneath. "What do you want, Nyx?" They were quiet for a long time. "To go back," they said at last. "To the moment before the ritual. To choose differently." Their form
flickered
. "But Dymas doesn't offer what you need. Only what you crave." The Heartstone pulsed three times in quick succession, then went still. Ahead of them, through a break in the trees, she could see it—a fountain carved from black stone, water
cascading
in ribbons that caught the amber light and turned it to liquid gold. It was the most beautiful thing she had ever seen. She kept her eyes on her boots and walked past it without stopping.
created_at
"2026-02-17T02:46:31.439732+00:00"
2/17/2026, 2:46:31 AM
model
"anthropic/claude-4.6-opus-20260205"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1720
moderation_latency
(null)
generation_time
65956
tokens_prompt
1590
tokens_completion
2611
native_tokens_prompt
1758
native_tokens_completion
2479
native_tokens_completion_images
(null)
native_tokens_reasoning
0
native_tokens_cached
0
num_media_prompt
(null)
num_input_audio_prompt
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num_media_completion
0
num_search_results
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origin
"https://ncbench.com/"
is_byok
false
finish_reason
"stop"
native_finish_reason
"stop"
usage
0.070765
router
(null)
provider_responses
0
id
"msg_01S6tUfhFZnEcGjJ7SX86Xnd"
status
200
is_byok
false
latency
1717
endpoint_id
"c926c048-563e-44b0-8434-95965bee924c"
provider_name
"Anthropic"
model_permaslug
"anthropic/claude-4.6-opus-20260205"
api_type
"completions"
id
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total_cost
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upstream_inference_cost
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provider_name
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Evaluation details
Result
Evaluator
Details
Meta Data
0.0000%
Adverbs in dialogue tags
Target: ≤10% dialogue tags with adverbs
totalTags
12
adverbTagCount
5
adverbTags
0
"she said, stupidly [stupidly]"
1
"the Seer had said, which was precisely the kind of unhelpful thing Isolde always said [precisely always]"
2
"Nyx said from somewhere to her left [somewhere]"
3
"he said again, picking up his knife [again]"
4
"they said softly [softly]"
54.0758%
AI-ism adverb frequency
Target: <1% AI-ism adverbs (57 tracked)
wordCount
1742
totalAiIsmAdverbs
8
found
0
adverb
"precisely"
count
1
1
adverb
"quickly"
count
1
2
adverb
"slightly"
count
1
3
adverb
"softly"
count
1
4
adverb
"really"
count
1
5
adverb
"very"
count
3
highlights
0
"precisely"
1
"quickly"
2
"slightly"
3
"softly"
4
"really"
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)
71.2974%
AI-ism word frequency
Target: <1% AI-ism words (140 tracked)
wordCount
1742
totalAiIsms
5
found
0
word
"flickered"
count
2
1
word
"cascading"
count
2
2
word
"silk"
count
1
highlights
0
"flickered"
1
"cascading"
2
"silk"
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
112
matches
(empty)
100.0000%
Filter word density
Target: ≤12% sentences with filter/hedge words
filterCount
0
hedgeCount
3
narrationSentences
112
filterMatches
(empty)
hedgeMatches
0
"tried to"
1
"seemed to"
100.0000%
Overuse of "that" (subordinate clause padding)
Target: ≤10% sentences with "that" clauses
thatCount
3
totalSentences
133
matches
0
"being that color"
1
"doing that thing"
2
"told that it"
100.0000%
Paragraph length variance
Target: CV ≥0.5 for paragraph word counts
totalParagraphs
48
mean
35.58
std
32.06
cv
0.901
sampleLengths
0
8
1
76
2
61
3
77
4
18
5
59
6
21
7
6
8
103
9
13
10
75
11
15
12
4
13
7
14
83
15
43
16
9
17
106
18
63
19
10
20
13
21
34
22
100
23
3
24
4
25
31
26
68
27
37
28
4
29
89
30
6
31
36
32
16
33
55
34
5
35
22
36
5
37
29
38
5
39
61
40
6
41
2
42
95
43
21
44
7
45
30
46
54
47
13
100.0000%
Passive voice overuse
Target: ≤5% passive sentences
passiveCount
2
totalSentences
112
matches
0
"being made"
1
"being told"
100.0000%
Past progressive (was/were + -ing) overuse
Target: ≤10% past progressive verbs
pastProgressiveCount
1
totalVerbs
220
matches
0
"were doing"
98.5940%
Purple prose (modifier overload)
Target: <4% adverbs, <2% -ly adverbs, no adj stacking
wordCount
1394
adjectiveStacks
0
stackExamples
(empty)
adverbCount
58
adverbRatio
0.04160688665710186
lyAdverbCount
13
lyAdverbRatio
0.009325681492109038
100.0000%
Repeated phrase echo
Target: ≤20% sentences with echoes (window: 2)
totalSentences
133
echoCount
0
echoWords
(empty)
100.0000%
Sentence length variance
Target: CV ≥0.4 for sentence word counts
totalSentences
133
mean
12.84
std
9.68
cv
0.754
sampleLengths
0
8
1
22
2
28
3
4
4
22
5
5
6
6
7
14
8
36
9
3
10
16
11
4
12
32
13
16
14
6
15
5
16
5
17
8
18
9
19
13
20
20
21
11
22
6
23
6
24
15
25
6
26
13
27
39
28
22
29
16
30
13
31
3
32
2
33
2
34
6
35
22
36
8
37
45
38
6
39
9
40
4
41
3
42
4
43
24
44
1
45
35
46
23
47
24
48
19
49
9
65.1629%
Sentence opener variety
Target: ≥60% unique sentence openers
consecutiveRepeats
10
diversityRatio
0.43609022556390975
totalSentences
133
uniqueOpeners
58
29.1667%
Dialogue tag variety (said vs. fancy)
Target: ≤30% fancy dialogue tags
totalTags
12
fancyCount
7
fancyTags
0
"Nyx whispered (whisper)"
1
"Nyx said, catching the movement (say, catch)"
2
"the Seer had said, which was precisely the kind of unhelpful thing Isolde always said (say, be precisely always say)"
3
"Nyx said from somewhere to her left (say leave)"
4
"Nyx murmured (murmur)"
5
"he said again, picking up his knife (say again, pick up)"
6
"they said softly (say softly)"
83.4292%