NC Bench
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Run: 2026-02-17-01KHMR774SY2NNKFW9G8QTR2CC
Run Details
Model:
Claude Opus 4.5
Test:
Bad Writing Habits
Scenario:
Fantasy: entering an ancient ruin
Duration:
56.7s
Cost:
$0.072535
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 rain and wind. Rory counted seven of them, arranged in a rough circle around a gap in the ancient oaks that shouldn't have been there. She'd walked through Richmond Park dozens of times since moving to London, had jogged past this exact stretch of woodland, and never once had she seen anything but unbroken forest. "You're certain this is safe?" she asked, though she already knew the answer. Nothing about the past three weeks had been safe. Nyx drifted beside her, their form more suggestion than substance in the afternoon light. When they spoke, their voice
seemed to
come from everywhere and nowhere, a whisper that bypassed her ears entirely. "Safe is a mortal concept. The Grove exists. Whether it welcomes us remains to be seen." "Comforting." Rory touched the pendant at her throat—a reflex now,
checking that the
deep crimson stone still hung against her collarbone. The Heartstone pulsed with faint warmth, though they were nowhere near a Hel portal. At least, she hoped they weren't. The gap between the stones
shimmered
. Not visibly, not in any way she could have described to someone who hadn't spent the last month
learning that the
world contained far more than she'd ever imagined. But she felt it—a pressure against her skin, a vibration in the air itself. The Veil, thin as gossamer here, separating the mundane from something older. "Stay close to me," Nyx said. "Time moves strangely beyond the boundary. Minutes here might be hours inside. Or the reverse." "And if we get separated?" The shade's violet eyes
flickered
. "Then you'll need to find your own way out. The Grove answers to Fae rules, not mortal ones." Rory took a breath, squared her shoulders, and stepped between the stones. The world tilted. Not physically—her feet remained planted on solid ground—but something fundamental shifted in her perception. The grey November sky vanished, replaced by a canopy of leaves that blazed with impossible colors: gold and copper and deep burgundy, shot through with threads of silver that might have been spider
silk
or something else entirely. Sunlight filtered through the branches in shafts thick as honey, warming her face despite the chill that lingered in her bones. "Oh," she breathed. The clearing stretched before her, far larger than the gap between the oaks had suggested. Wildflowers carpeted the ground in drifts of blue and white and pale pink, their petals swaying in a breeze she couldn't
feel
. The air smelled of growing things—earth and sap and something sweeter, like fruit on the edge of rot. Beautiful and unsettling in equal measure. Nyx materialized beside her, their shadow-form somehow more solid here than it had been in the mortal world. "The Grove exists in the spaces between," they murmured. "Neither fully Earth nor fully Fae. A threshold place." "It's beautiful." Rory took a tentative step forward, half-expecting the ground to give way beneath her. It held. The grass was soft as
velvet
under her boots, and tiny white flowers bent around her
footsteps
before springing back upright, unmarked by her passage. She noticed, then, that Nyx left no footprints either. But that was different—Nyx rarely left marks on the physical world. Here, the Grove itself
seemed to
refuse any evidence of intrusion. "The Seer's dwelling lies deeper in." Nyx gestured toward a path that wound between the trees—silver birches with bark that gleamed like metal, their leaves chiming
softly
against each other like distant bells. "She'll know we've crossed the boundary. Whether she chooses to receive us..." "Is up to her. I know." Rory started down the path, hyperaware of every rustle and whisper around her. The forest watched. She could
feel
attention pressing against her from all directions, curious and
calculating
and
utterly
inhuman. The path curved, doubled back on itself, led them through a tunnel of woven branches that opened onto a stream so clear she could count individual pebbles on its bed three feet down. The water sang as it flowed—not a metaphor, not poetic fancy, but actual music, notes that rose and fell in patterns just complex enough to suggest meaning without ever resolving into words. "Don't drink from it," Nyx warned as Rory crouched at the water's edge. "And don't make any promises while we're here. The Grove remembers, and Fae bargains are binding." "Even for a shade?" Something that might have been a laugh rippled through Nyx's form. "I
learned that lesson
centuries ago, when I still had flesh to bargain with." Rory straightened, her hand drifting again to the Heartstone. Its warmth had faded since they'd entered the Grove, the crimson gem cool and dormant against her skin. Whatever power it responded to, this place didn't trigger it. They walked on. The forest shifted around them—or perhaps they shifted through the forest, following paths that rearranged themselves with each step. Rory caught glimpses of movement in her peripheral vision: a flash of iridescent wings, a pair of eyes too large and too bright to be human, a figure that might have been a woman or might have been a birch tree swaying in a wind that touched nothing else. She didn't look directly at any of them. Some instinct warned her that to acknowledge them would be to invite attention she wasn't prepared to receive. The path opened without warning into a clearing ringed by standing stones—different from the ones at the boundary, older and more weathered, covered in spiraling carvings that
seemed to
move when she
wasn't looking
at them directly. At the center of the clearing stood a cottage that couldn't possibly exist. Its walls
were woven
from living branches, leaves and flowers growing directly from the structure itself. The roof was a thatch of golden straw that caught the strange light and threw it back in rainbows. Smoke curled from a chimney that
appeared to
be a hollowed oak trunk, and the smell of it—woodsmoke and herbs and something achingly familiar that Rory couldn't quite name—made her chest tight with unexpected longing. "She's expecting us," Nyx said quietly. The cottage door opened. Isolde Varga stood in the threshold, and Rory understood immediately why the codex entries she'd read had described her as
ethereal
. The half-Fae woman
seemed to
exist at a slight angle to reality, her silver hair flowing around her shoulders like water despite the absence of wind. Her eyes were pale lavender, beautiful and unsettling, fixed on Rory with an intensity that made her want to take a step back. "The carter's daughter comes at last." Isolde's voice was music too, but sharper than the stream's song, with edges that suggested it could cut if she chose to wield it that way. "And the shadow who was once a man. I wondered when you would find your way here." "You knew we were coming?" Rory asked. "I know many things." Isolde descended the cottage's single step, moving with a grace that left no impression on the grass beneath her feet. "Some I may speak. Others remain locked behind my teeth. Such is the burden of sight." She circled Rory
slowly
, studying her from angles that shouldn't have been possible given the laws of three-dimensional space. Her lavender gaze lingered on the Heartstone pendant, and something
flickered
across her ageless features—recognition, perhaps, or concern. "You carry a piece of Dymas against your heart," she said. "A realm of excess and indulgence, of feasts that never end and hunger that is never satisfied. An interesting gift for one who fled a different kind of consuming." Rory's hand closed protectively over the pendant. "You know about Evan?" "I know about many things." Isolde's smile was not quite kind. "The question you must ask yourself is not what I know, but what you are willing to pay to hear me speak it." "We were told you offer prophecies to those who seek you out." Nyx moved to stand beside Rory, their shadow-form drawing closer around them both. "We seek guidance. The Veil weakens, and forces move against—" "I know what moves." Isolde cut them off with a gesture, her silver hair rippling. "I have watched it in my dreams for three hundred years. The question is not whether darkness comes—darkness always comes. The question is what the carter's daughter intends to do when it arrives." She turned her attention back to Rory, those pale eyes seeing through her in a way that made her
feel
stripped bare. "You carry a blade I forged in another age, given to another seeker, passed down through hands I chose not to foresee. Does it still sing when the moon rises?" Rory reached into her jacket and withdrew the Fae-Forged Blade. The moonsilver dagger was cold against her palm, its leaf-shaped blade faintly luminescent even in the diffuse light of the Grove. "It hums sometimes. At night, when I can't sleep." "It remembers what it was made for." Isolde reached out and ran one finger along the flat of the blade, and the metal sang—a single pure note that
hung in the air
long after she'd pulled her hand away. "To cut through wards. To pierce demon flesh. To sever what should not be joined." Her eyes met Rory's. "Are you prepared to wield it for its intended purpose?" "I don't know what its intended purpose is." "Then that is your first lesson." Isolde stepped back, gesturing toward the cottage. "Come inside. I cannot lie to you—the compulsion of my mother's blood forbids it—but I can tell you what I see. And what I see is a convergence, a knot in the weave of fate, with you at its center." She paused at the door, looking back over her shoulder with an expression that might have been pity or might have been something older and stranger. "The carter's daughter who fled one monster only to find herself pursued by others. The pendant that pulses with Hel's warmth. The shadow bound to the mortal plane by chains of his own making." Her smile widened, showing teeth that were just
slightly
too sharp. "What interesting threads you bring to my Grove. I wonder what pattern we might weave together." She disappeared into the cottage, leaving the door open behind her. Rory looked at Nyx. The shade's violet eyes were
unreadable
, their form flickering at the edges like a candle flame in a draft. "We could still leave," Nyx said quietly. "The boundary would let us pass. We could find another way." "Is there another way?" Silence stretched between them, filled with the chiming of silver leaves and the distant singing of water. "No," Nyx admitted finally. "There isn't." Rory squared her shoulders, touched the Heartstone pendant one more time, and stepped through the cottage door into whatever prophecy waited beyond.
created_at
"2026-02-17T02:53:36.269477+00:00"
2/17/2026, 2:53:36 AM
model
"anthropic/claude-4.5-opus-20251124"
app_id
182717
external_user
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streamed
true
cancelled
false
latency
1547
moderation_latency
180
generation_time
56460
tokens_prompt
1590
tokens_completion
2775
native_tokens_prompt
1757
native_tokens_completion
2550
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
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origin
"https://ncbench.com/"
is_byok
false
finish_reason
"stop"
native_finish_reason
"stop"
usage
0.072535
router
(null)
provider_responses
0
id
"ffea31a9-0797-4ebc-8aee-b58491b62ad5"
status
200
is_byok
false
latency
1547
endpoint_id
"de32581c-2e11-4f54-8d29-e8a6e19d3038"
provider_name
"Amazon Bedrock"
model_permaslug
"anthropic/claude-4.5-opus-20251124"
api_type
"completions"
id
"gen-1771296758-C93tVGudPCU3YUWgJmVq"
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provider_name
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Evaluation details
Result
Evaluator
Details
Meta Data
42.4242%
Adverbs in dialogue tags
Target: ≤10% dialogue tags with adverbs
totalTags
11
adverbTagCount
3
adverbTags
0
"Nyx said quietly [quietly]"
1
"Nyx said quietly [quietly]"
2
"Nyx admitted finally [finally]"
78.1421%
AI-ism adverb frequency
Target: <1% AI-ism adverbs (57 tracked)
wordCount
1830
totalAiIsmAdverbs
4
found
0
adverb
"slightly"
count
1
1
adverb
"slowly"
count
1
2
adverb
"softly"
count
1
3
adverb
"utterly"
count
1
highlights
0
"slightly"
1
"slowly"
2
"softly"
3
"utterly"
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)
50.8197%
AI-ism word frequency
Target: <1% AI-ism words (140 tracked)
wordCount
1830
totalAiIsms
9
found
0
word
"ethereal"
count
1
1
word
"flickered"
count
2
2
word
"shimmered"
count
1
3
word
"velvet"
count
1
4
word
"silk"
count
1
5
word
"calculating"
count
1
6
word
"unreadable"
count
1
7
word
"footsteps"
count
1
highlights
0
"ethereal"
1
"flickered"
2
"shimmered"
3
"velvet"
4
"silk"
5
"calculating"
6
"unreadable"
7
"footsteps"
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
85
matches
(empty)
100.0000%
Filter word density
Target: ≤12% sentences with filter/hedge words
filterCount
1
hedgeCount
5
narrationSentences
85
filterMatches
0
"feel"
hedgeMatches
0
"seemed to"
1
"appeared to"
100.0000%
Overuse of "that" (subordinate clause padding)
Target: ≤10% sentences with "that" clauses
thatCount
3
totalSentences
110
matches
0
"checking that the"
1
"learning that the"
2
"learned that lesson"
100.0000%
Paragraph length variance
Target: CV ≥0.5 for paragraph word counts
totalParagraphs
52
mean
34.73
std
24.22
cv
0.697
sampleLengths
0
72
1
22
2
49
3
41
4
61
5
21
6
5
7
23
8
12
9
3
10
73
11
3
12
61
13
36
14
43
15
31
16
45
17
38
18
65
19
29
20
4
21
25
22
37
23
71
24
26
25
120
26
6
27
4
28
70
29
49
30
7
31
40
32
37
33
40
34
11
35
34
36
35
37
48
38
52
39
40
40
68
41
8
42
53
43
26
44
61
45
11
46
23
47
18
48
4
49
17
100.0000%
Passive voice overuse
Target: ≤5% passive sentences
passiveCount
1
totalSentences
85
matches
0
"were woven"
100.0000%
Past progressive (was/were + -ing) overuse
Target: ≤10% past progressive verbs
pastProgressiveCount
1
totalVerbs
213
matches
0
"wasn't looking"
96.7816%
Purple prose (modifier overload)
Target: <4% adverbs, <2% -ly adverbs, no adj stacking
wordCount
1305
adjectiveStacks
0
stackExamples
(empty)
adverbCount
57
adverbRatio
0.04367816091954023
lyAdverbCount
20
lyAdverbRatio
0.01532567049808429
100.0000%
Repeated phrase echo
Target: ≤20% sentences with echoes (window: 2)
totalSentences
110
echoCount
0
echoWords
(empty)
100.0000%
Sentence length variance
Target: CV ≥0.4 for sentence word counts
totalSentences
110
mean
16.42
std
10.02
cv
0.61
sampleLengths
0
20
1
22
2
30
3
13
4
9
5
14
6
19
7
16
8
21
9
14
10
6
11
6
12
29
13
14
14
12
15
6
16
15
17
5
18
5
19
18
20
12
21
3
22
14
23
38
24
21
25
3
26
15
27
22
28
18
29
6
30
18
31
9
32
9
33
16
34
2
35
25
36
9
37
11
38
11
39
33
40
12
41
19
42
3
43
16
44
33
45
32
46
13
47
16
48
4
49
11
62.1212%
Sentence opener variety
Target: ≥60% unique sentence openers
consecutiveRepeats
5
diversityRatio
0.4
totalSentences
110
uniqueOpeners
44
15.9091%
Dialogue tag variety (said vs. fancy)
Target: ≤30% fancy dialogue tags
totalTags
11
fancyCount
7
fancyTags
0
"she breathed (breathe)"
1
"they murmured (murmur)"
2
"started (start)"
3
"Nyx warned as Rory crouched at the water's edge (warn crouch)"
4
"Nyx said quietly (say quietly)"
5
"Nyx said quietly (say quietly)"
6
"Nyx admitted finally (admit finally)"
85.0705%