NC Bench
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Run: 2026-02-17-01KHMQEY62BSVMJJHYSHFB1XAB
Run Details
Model:
Claude Opus 4.5
Test:
Bad Writing Habits
Scenario:
Fantasy: entering an ancient ruin
Duration:
55.1s
Cost:
$0.072760
Provider:
Amazon Bedrock
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 standing stones rose from the earth like broken teeth, their surfaces worn smooth by centuries of wind and rain. Rory counted seven of them, ancient oaks petrified into something harder than wood, arranged in a rough circle at the edge of a clearing that shouldn't exist. She'd walked through Richmond Park dozens of times since moving to London, had traced these paths on lazy Sunday afternoons when the flat above Silas's bar felt too small and her thoughts too loud. She'd never seen this place before. "It wasn't here yesterday," she said, though that wasn't quite right. The moss climbing the stones looked decades old, and the grass beneath her feet had grown thick and undisturbed. This clearing had been here for a
very
long time. She simply hadn't
been allowed
to see it until now. Nyx drifted past her, their form rippling at the edges like smoke caught in a draft. In the dappled light filtering through the canopy, they looked less substantial than usual, their violet eyes the only solid thing about them. "The Grove shows itself to those it chooses to receive. Or those it wishes to consume." Their voice carried on a breeze Rory couldn't feel. "I confess I've never determined which applies to first-time visitors." "That's comforting." Rory touched the Heartstone pendant beneath her collar, a habit she'd developed over the past week. The crimson gem lay cool against her skin—no warmth, no pulse. Whatever this place was, it wasn't a portal to Hel. Small mercies. She stepped between two of the standing stones, and the world shifted. The change wasn't violent. No flash of light, no thunderclap of displaced air. One moment she stood at the edge of Richmond Park on a grey October morning, and the next she walked through a meadow that had never known autumn. Wildflowers carpeted the ground in impossible profusion—bluebells and foxglove, primrose and wild orchid, all blooming together in defiance of season and sense. The sky above had softened from London's perpetual overcast to something warmer, gentler, the color of honey held up to candlelight. Rory's breath caught in her throat. She'd grown up on stories of places like this—her mother's Welsh fairy tales, whispered at bedtime in their Cardiff townhouse. Annwn, the otherworld. The land beneath the hills. She'd stopped believing in such things around the same time she'd stopped
believing that her
father's silences were anything other than disapproval. But here, now, with impossible flowers brushing against her jeans and air that tasted faintly of rain and roses, belief seemed like a small thing to surrender. "Don't eat anything." Nyx materialized beside her, more solid now, their shadowed form drinking in the ambient light. "Don't drink from any stream. Don't accept any gift you haven't negotiated for." They paused. "And whatever you do, don't thank anyone." "I've read the stories." "Stories are shadows of truth. They get the shape right but miss the substance." Nyx tilted their head, and for a moment Rory caught something almost like nostalgia in their expression—remarkable, given they had no face to speak of. "I came here once, long ago. When I still cast a shadow rather than being one." Before she could ask what they meant, movement
flickered
at the edge of her vision. Rory turned, her hand dropping instinctively to the Fae-forged blade at her hip. Isolde's gift was cold even through the leather of its sheath, a constant chill that had taken some getting used to. A doe stood at the far end of the meadow, watching them with eyes that held too much intelligence. Its coat
shimmered
between white and silver, and when it turned to walk deeper into the grove, Rory understood they
were meant
to follow. The meadow gave way to forest, but not the managed woodland of Richmond Park with its trimmed paths and informational signage. These trees grew wild and ancient, their branches interweaving overhead to form a living cathedral. Light filtered through in shafts and streams, painting e
very
thing in shades of green and gold. The air grew thicker, sweeter, heavy with the scent of growing things. Rory's sense of direction had abandoned her within the first dozen steps. The path wound and doubled back on itself, following a logic that had nothing to do with geography. Time felt different here too—elastic, unreliable. She couldn't have said whether they'd been walking for minutes or hours. "Do you
feel that?" She
kept her voice low, though she couldn't have explained why. "Like someone's watching?" "Something is always watching in the Fae-touched places." Nyx moved beside her, their passage
utterly
silent. "The land itself has eyes here. Ears. Appetite." The doe paused ahead of them, looking back with those
uncanny
eyes. Then it stepped through a curtain of hanging vines and vanished. Rory pushed through after it. The
clearing that waited
on the other side stole the breath from her lungs. A pool of water dominated the center, so clear she could count the stones on its bed, each one smooth and pale as bone. Around it, the wildflowers grew even more profuse, climbing the trunks of the surrounding trees and hanging in cascades from the branches above. And there, seated on a fallen log at the water's edge, was a woman who could not possibly be human. Isolde Varga looked up at their approach. Her silver hair fell to her waist in a waterfall of moonlight, and her pale lavender eyes held depths that no mortal gaze could match. She was beautiful in the way that dangerous things were beautiful—a blade's edge, a lightning strike, a flame
dancing
too close to bare skin. "The stone-carrier comes at last." Isolde's voice was music and wind chimes, the creak of old wood and the whisper of running water. "Three nights the Grove has called. Three nights you did not hear. But tonight—tonight, the shadows brought you to my door." Rory stopped a careful distance from the water's edge. "You're Isolde. The Seer." "I am what I am, which is what I've always been. Names are such fragile things." Isolde rose from her seat with a grace that
seemed to
bend the laws of physics. She left no footprints as she moved, Rory noticed—the grass simply declined to acknowledge her passage. "You carry questions like stones in your pocket. They weigh you down. They make you slow." "I was told you could help me understand—" Rory touched the pendant again. "This. Where it came from. What it means." "Understanding is a river that flows in one direction. You cannot step into it twice the same way." Isolde circled them
slowly
, and Rory had to resist the urge to turn with her. Showing fear in the presence of the Fae was never wise. "But I see your thread, little stone-carrier. I see where it tangles and where it frays." She stopped in front of Nyx, and something
flickered
across her ageless features—recognition, perhaps, or old sorrow. "Aldric. Still wearing the shadows like a shroud." Nyx went still in a way that living shadow should not be capable of. "That name died a long time ago." "Nothing
truly
dies. It only changes form." Isolde reached out as if to touch them, then let her hand fall. "You sought to pierce the Veil and instead became part of it. Such is the price of reaching for things beyond mortal grasp." "I didn't come here for a lecture on my failures." "No. You came because the stone-carrier asked, and you have been waiting four hundred years to be asked for anything other than death." Isolde turned back to Rory, and the
weight
of her attention was like standing in a spotlight. "The pendant you wear was forged in Dymas, where excess is virtue and hunger is a form of worship. It was made to find doorways—to feel them, to hunger for them, as its makers hunger for all things." Rory's hand closed around the stone. Through her shirt, she could feel its edges, the cool smoothness of the crimson gem. "Someone gave this to me. Left it outside my door." "Gifts are never free, least of all in matters of Hel and Hearth." Isolde
began to
move again, drifting toward the pool. The water's surface remained
utterly
still, refusing to show her reflection. "The one who gave you this gift wishes you to find a door. The question you should ask—the question that will keep you alive—is which door, and why." "Can you tell me who sent it?" "I can tell you only what I see, and what I see are threads, not hands." Isolde knelt at the water's edge, her silver hair pooling around her like liquid mercury. "Your thread crosses many others, stone-carrier. Some bright, some dark, some that have not yet been spun. But there is one thread that binds them all together—a thread the color of amber light, of warm kitchens and whispered secrets, of a prince who has grown bored with plenty." Rory felt a chill despite the grove's warmth. "A prince?" "Dymas has a ruler, as all realms do. And rulers, when they tire of their crowns, find sport in mortal games." Isolde looked up, and for just a moment, something like pity crossed her features. "The Veil thins, Aurora Carter. It thins and tears and bleeds. And when it falls entirely—when winter comes in truth—you will stand at the door you were always meant to find." The clearing
seemed to
darken, though the honey-gold light hadn't changed. Rory became acutely aware of the blade at her hip, its perpetual cold
suddenly
reassuring.
"Is that a
prophecy?" Isolde smiled, and there was nothing human in it at all. "It is what it is, which is what it has always been. Make of it what you will. The Grove asks only that you remember—nothing given here is freely given, and nothing taken here is ever
truly
owned." She stood in one fluid motion and held out her hand. In her palm rested a single flower—a white rose, its petals edged with silver frost. "A gift," Isolde said. "And a debt. When the door opens, this will show you whether it leads to salvation or to ruin." Rory hesitated. Nyx's warning
echoed
in her mind: don't accept any gift you haven't negotiated for. But something in Isolde's lavender eyes made her reach out anyway. The rose was cold in her fingers, colder even than the blade at her hip. And as her skin made contact with the frost-touched petals, the clearing rippled around her like a reflection disturbed by a thrown stone. When the world settled again, she
was standing
at the edge of Richmond Park. The standing stones
were gone
. The October morning was grey and ordinary. In her hand, the rose was already beginning to wilt—but its cold remained, burning against her palm like a promise. Or a warning.
created_at
"2026-02-17T02:40:19.406392+00:00"
2/17/2026, 2:40:19 AM
model
"anthropic/claude-4.5-opus-20251124"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1687
moderation_latency
188
generation_time
54890
tokens_prompt
1590
tokens_completion
2723
native_tokens_prompt
1757
native_tokens_completion
2559
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
0.07276
router
(null)
provider_responses
0
id
"d3a1eae0-c49e-4453-97d6-e49d805200be"
status
200
is_byok
false
latency
1687
endpoint_id
"de32581c-2e11-4f54-8d29-e8a6e19d3038"
provider_name
"Amazon Bedrock"
model_permaslug
"anthropic/claude-4.5-opus-20251124"
api_type
"completions"
id
"gen-1771295963-LhcnJZkyUEm7rBhRc4NR"
upstream_id
"d3a1eae0-c49e-4453-97d6-e49d805200be"
total_cost
0.07276
cache_discount
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upstream_inference_cost
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provider_name
"Amazon Bedrock"
Evaluation details
Result
Evaluator
Details
Meta Data
0.0000%
Adverbs in dialogue tags
Target: ≤10% dialogue tags with adverbs
totalTags
2
adverbTagCount
1
adverbTags
0
"she said, though that wasn't quite right [quite]"
61.9978%
AI-ism adverb frequency
Target: <1% AI-ism adverbs (57 tracked)
wordCount
1842
totalAiIsmAdverbs
7
found
0
adverb
"slowly"
count
1
1
adverb
"suddenly"
count
1
2
adverb
"utterly"
count
2
3
adverb
"truly"
count
2
4
adverb
"very"
count
1
highlights
0
"slowly"
1
"suddenly"
2
"utterly"
3
"truly"
4
"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)
61.9978%
AI-ism word frequency
Target: <1% AI-ism words (140 tracked)
wordCount
1842
totalAiIsms
7
found
0
word
"flickered"
count
2
1
word
"shimmered"
count
1
2
word
"uncanny"
count
1
3
word
"weight"
count
1
4
word
"dancing"
count
1
5
word
"echoed"
count
1
highlights
0
"flickered"
1
"shimmered"
2
"uncanny"
3
"weight"
4
"dancing"
5
"echoed"
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
89
matches
(empty)
100.0000%
Filter word density
Target: ≤12% sentences with filter/hedge words
filterCount
0
hedgeCount
3
narrationSentences
89
filterMatches
(empty)
hedgeMatches
0
"seemed to"
1
"began to"
100.0000%
Overuse of "that" (subordinate clause padding)
Target: ≤10% sentences with "that" clauses
thatCount
4
totalSentences
114
matches
0
"believing that her"
1
"feel that?\" She"
2
"clearing that waited"
3
"\"Is that a"
100.0000%
Paragraph length variance
Target: CV ≥0.5 for paragraph word counts
totalParagraphs
48
mean
37.81
std
24.92
cv
0.659
sampleLengths
0
87
1
50
2
74
3
41
4
12
5
84
6
83
7
40
8
4
9
55
10
49
11
43
12
63
13
48
14
18
15
24
16
23
17
5
18
14
19
67
20
56
21
44
22
13
23
64
24
21
25
60
26
17
27
8
28
21
29
43
30
10
31
78
32
31
33
61
34
7
35
79
36
10
37
66
38
26
39
4
40
49
41
26
42
23
43
16
44
49
45
14
46
32
47
3
100.0000%
Passive voice overuse
Target: ≤5% passive sentences
passiveCount
3
totalSentences
89
matches
0
"been allowed"
1
"were meant"
2
"were gone"
100.0000%
Past progressive (was/were + -ing) overuse
Target: ≤10% past progressive verbs
pastProgressiveCount
1
totalVerbs
187
matches
0
"was standing"
94.0000%
Purple prose (modifier overload)
Target: <4% adverbs, <2% -ly adverbs, no adj stacking
wordCount
1249
adjectiveStacks
1
stackExamples
0
"lay cool against her"
adverbCount
40
adverbRatio
0.032025620496397116
lyAdverbCount
11
lyAdverbRatio
0.008807045636509208
100.0000%
Repeated phrase echo
Target: ≤20% sentences with echoes (window: 2)
totalSentences
114
echoCount
0
echoWords
(empty)
100.0000%
Sentence length variance
Target: CV ≥0.4 for sentence word counts
totalSentences
114
mean
15.92
std
9.43
cv
0.592
sampleLengths
0
20
1
27
2
34
3
6
4
11
5
19
6
10
7
10
8
16
9
23
10
25
11
10
12
18
13
11
14
10
15
2
16
12
17
4
18
9
19
28
20
22
21
21
22
6
23
20
24
3
25
5
26
22
27
27
28
18
29
15
30
7
31
4
32
39
33
16
34
15
35
13
36
21
37
19
38
24
39
21
40
15
41
15
42
12
43
12
44
18
45
6
46
12
47
15
48
3
49
16
63.4503%
Sentence opener variety
Target: ≥60% unique sentence openers
consecutiveRepeats
6
diversityRatio
0.41228070175438597
totalSentences
114
uniqueOpeners
47
50.0000%
Dialogue tag variety (said vs. fancy)
Target: ≤30% fancy dialogue tags
totalTags
2
fancyCount
1
fancyTags
0
"she said, though that wasn't quite right (say, does be not)"
84.2027%