Run: 2026-05-29-01KSSK2QT8N67FPHQYHXMR7GCM

Run Details

Duration:
37.2s
Cost:
$0.056100
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

AI
The standing stones came up out of the dark like teeth. Rory had walked Richmond Park in daylight a dozen times since coming to London, but never this far, never this late, and never alone. The path she'd followed had stopped being a path somewhere back among the bracken, dissolving into deer-trodden grass and then into nothing at all. She'd kept going because Eva's note had been very specific. *Past the old oaks. When the flowers don't make sense, you're close.* The flowers didn't make sense. It was October. The cold had crept into the city weeks ago, stripping the plane trees along her street down to their bones. But here, in the hollow between the ancient oaks, the ground was soft with bluebells and cowslip and something pale and star-shaped she didn't have a name for, all of it blooming as though it were the first warm week of May. The blossoms glowed faintly in the moonlight, and the air smelled green and sweet and wrong, the way fruit smells in the half-second before you realize it's gone over. Rory stopped at the threshold of the stones and listened. Silence. Not the ordinary silence of a park at night, which was never truly silent — there was always the hum of the distant city, the drone of an airplane, the rustle of small living things in the undergrowth. This silence had weight. It pressed against her ears like deep water. She could hear her own pulse, the soft creak of her jacket as she breathed. She should turn around. That thought arrived calm and clear, the way her good thoughts always did, the cool-headed ones that had gotten her out of Cardiff and away from Evan and into a life that was at least, technically, her own. *Turn around. Go home. Whatever Eva wants can wait for daylight.* But Eva had sounded frightened on the phone. And the note had been pressed under Rory's door, not texted, not emailed, as though Eva hadn't trusted any wire to carry it. So Rory stepped between the stones. The pendant warmed against her sternum. She'd nearly forgotten she was wearing it. The Heartstone had come to her three weeks ago in a plain box with no return address, a crimson gem on a silver chain, no note, no explanation. She'd worn it because it was beautiful and because some part of her, the part that didn't say its reasons out loud, had felt safer with it on. Now it lay against her skin like a coal that had been resting in sun. Not painful. Just present. A faint, insistent pulse, like a second heart keeping time slightly out of step with her first. "Eva?" Her voice didn't carry. The word dropped out of her mouth and fell at her feet. Nothing answered. The clearing was larger inside than it had looked from the edge — that was her first concrete wrongness, the kind she could name. From the stones it had seemed a modest hollow, a circle she could cross in twenty paces. Now she walked, and walked, and the far line of trees stayed exactly where it had been. The grass under her boots whispered. The flowers turned their glowing faces toward her as she passed, or seemed to, though there was no wind to move them. She told herself it was the moonlight. She told herself a lot of things. The first sound came when she had been walking long enough that her legs were tired. A child's laugh, high and bright and brief, somewhere off to her right among the trees. She spun toward it. The treeline stood dark and still. The laugh did not come again, but the silence after it was different now, expectant, the silence of something holding very still and watching to see what she would do. "This isn't funny," Rory said, and hated the thinness of her own voice. The Heartstone pulsed harder. She knew about adrenaline. She knew about the body's tricks, the way fear could manufacture footsteps and faces out of nothing. She had used that knowledge to talk herself down a hundred nights in Cardiff, lying awake listening for a key in a lock that no longer fit. She summoned it now, marshalled it like a barrister assembling a case. *There is a rational explanation. There is always a rational explanation.* Then something moved at the edge of her vision, and when she turned her head it was gone, and the place where it had been was simply a stand of cowslip nodding gently though the air was dead still. She started walking faster. Toward the far trees, where the path out — if there was a path out — had to be. The flowers brushed her ankles. The moon, she noticed with a slow cold dread, had not moved. It hung fat and white directly overhead, exactly where it had been when she entered, and she could not remember it being overhead at all when she'd stood at the stones. It had been low then. Hadn't it? She tried to fix the memory and found it slippery, soft at the edges, like a dream recalled at noon. *Time moves differently here.* The thought arrived from nowhere, in a voice that was almost her own. A second laugh. The other side now. Then a third, behind her, and a fourth, layered over it, until the laughter was all around her, children and not-children, a sweet chiming chorus with no source and no breath behind it. Rory stopped. Her heart slammed. The pendant burned. "Where's Eva?" she shouted, and her voice carried this time, too well, ringing out across the impossible clearing and coming back to her changed, an echo that arrived a half-beat too late and a half-tone too low. "Where is she? What do you want?" The laughter stopped all at once. In the new silence she heard, very clearly, very close, the soft sound of something breathing behind her. Slow. Patient. Enjoying itself. She felt the warmth of it on the back of her neck, sweet-rotten, the smell of the flowers given lungs. Rory did not turn around. She closed her hand around the Heartstone, and it was scorching now, throbbing in time with the thing at her back, and she understood with a calm and terrible clarity that Eva had never written that note at all. The breathing leaned closer. "You came," it said, in Eva's voice. "We're so glad you came."
created_at"2026-05-29T10:04:36.049Z" 5/29/2026, 10:04:36 AM
model"anthropic/claude-4.8-opus-20260528"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency3002
moderation_latency(null)
generation_time37173
tokens_prompt812
tokens_completion1598
native_tokens_prompt1170
native_tokens_completion2010
native_tokens_completion_images(null)
native_tokens_reasoning51
native_tokens_cached0
num_media_prompt(null)
num_input_audio_prompt(null)
num_media_completion0
num_search_results(null)
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origin"https://ncbench.com/"
is_byokfalse
finish_reason"stop"
native_finish_reason"end_turn"
service_tier"default"
usage0.0561
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provider_responses
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is_byokfalse
latency1436
model_permaslug"anthropic/claude-4.8-opus-20260528"
provider_name"Anthropic"
status200
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Evaluation details

Result Evaluator Details Meta Data
100.00% Adverbs in dialogue tags
Target: ≤10% dialogue tags with adverbs
totalTags4
adverbTagCount0
adverbTags(empty)
dialogueSentences6
tagDensity0.667
leniency1
rawRatio0
effectiveRatio0
67.59% AI-ism adverb frequency
Target: <2% AI-ism adverbs (58 tracked)
wordCount1080
totalAiIsmAdverbs7
found
0
adverb"very"
count4
1
adverb"truly"
count1
2
adverb"slightly"
count1
3
adverb"gently"
count1
highlights
0"very"
1"truly"
2"slightly"
3"gently"
100.00% AI-ism character names
Target: 0 AI-default names (17 tracked, −20% each)
codexExemptions(empty)
found(empty)
100.00% AI-ism location names
Target: 0 AI-default location names (33 tracked, −20% each)
codexExemptions(empty)
found(empty)
39.81% AI-ism word frequency
Target: <2% AI-ism words (290 tracked)
wordCount1080
totalAiIsms13
found
0
word"silence"
count6
1
word"weight"
count1
2
word"pulse"
count2
3
word"pulsed"
count1
4
word"footsteps"
count1
5
word"echo"
count1
6
word"warmth"
count1
highlights
0"silence"
1"weight"
2"pulse"
3"pulsed"
4"footsteps"
5"echo"
6"warmth"
100.00% Cliché density
Target: ≤1 cliche(s) per 800-word window
totalCliches0
maxInWindow0
found(empty)
highlights(empty)
100.00% Emotion telling (show vs. tell)
Target: ≤3% sentences with emotion telling
emotionTells0
narrationSentences83
matches(empty)
91.22% Filter word density
Target: ≤3% sentences with filter/hedge words
filterCount1
hedgeCount2
narrationSentences83
filterMatches
0"realize"
hedgeMatches
0"seemed to"
1"tried to"
100.00% Gibberish response detection
Target: ≤1% gibberish-like sentences (hard fail if a sentence exceeds 800 words)
analyzedSentences85
gibberishSentences0
adjustedGibberishSentences0
longSentenceCount0
runOnParagraphCount0
giantParagraphCount0
wordSaladCount0
repetitionLoopCount0
controlTokenCount0
repeatedSegmentCount0
maxSentenceWordsSeen43
ratio0
matches(empty)
100.00% Markdown formatting overuse
Target: ≤5% words in markdown formatting
markdownSpans4
markdownWords38
totalWords1084
ratio0.035
matches
0"Past the old oaks. When the flowers don't make sense, you're close."
1"Turn around. Go home. Whatever Eva wants can wait for daylight."
2"There is a rational explanation. There is always a rational explanation."
3"Time moves differently here."
100.00% Missing dialogue indicators (quotation marks)
Target: ≤10% speech attributions without quotation marks
totalAttributions5
unquotedAttributions0
matches(empty)
100.00% Name drop frequency
Target: ≤1.0 per-name mentions per 100 words
totalMentions24
wordCount1064
uniqueNames10
maxNameDensity0.66
worstName"Rory"
maxWindowNameDensity1.5
worstWindowName"Eva"
discoveredNames
Richmond1
Park1
London1
Eva6
October1
May1
Cardiff2
Evan1
Rory7
Heartstone3
persons
0"Eva"
1"Evan"
2"Rory"
3"Heartstone"
places
0"Richmond"
1"Park"
2"London"
3"Cardiff"
globalScore1
windowScore1
100.00% Narrator intent-glossing
Target: ≤2% narration sentences with intent-glossing patterns
analyzedSentences52
glossingSentenceCount0
matches(empty)
100.00% "Not X but Y" pattern overuse
Target: ≤1 "not X but Y" per 1000 words
totalMatches0
per1kWords0
wordCount1084
matches(empty)
88.24% Overuse of "that" (subordinate clause padding)
Target: ≤2% sentences with "that" clauses
thatCount2
totalSentences85
matches
0"used that knowledge"
1"written that note"
100.00% Paragraph length variance
Target: CV ≥0.5 for paragraph word counts
totalParagraphs29
mean37.38
std31.78
cv0.85
sampleLengths
011
170
25
394
410
566
653
737
86
999
1017
112
1286
1314
1472
1513
164
1771
1839
1998
2017
2148
2244
236
2442
255
2639
274
2812
96.81% Passive voice overuse
Target: ≤2% passive sentences
passiveCount2
totalSentences83
matches
0"been pressed"
1"was gone"
2"been was"
100.00% Past progressive (was/were + -ing) overuse
Target: ≤2% past progressive verbs
pastProgressiveCount2
totalVerbs169
matches
0"was wearing"
1"was scorching"
42.02% Em-dash & semicolon overuse
Target: ≤2% sentences with em-dashes/semicolons
emDashCount4
semicolonCount0
flaggedSentences3
totalSentences85
ratio0.035
matches
0"Not the ordinary silence of a park at night, which was never truly silent — there was always the hum of the distant city, the drone of an airplane, the rustle of small living things in the undergrowth."
1"The clearing was larger inside than it had looked from the edge — that was her first concrete wrongness, the kind she could name."
2"Toward the far trees, where the path out — if there was a path out — had to be."
96.49% Purple prose (modifier overload)
Target: <4% adverbs, <2% -ly adverbs, no adj stacking
wordCount1068
adjectiveStacks0
stackExamples(empty)
adverbCount47
adverbRatio0.04400749063670412
lyAdverbCount12
lyAdverbRatio0.011235955056179775
100.00% Repeated phrase echo
Target: ≤20% sentences with echoes (window: 2)
totalSentences85
echoCount0
echoWords(empty)
100.00% Sentence length variance
Target: CV ≥0.4 for sentence word counts
totalSentences85
mean12.75
std11.05
cv0.866
sampleLengths
011
124
224
310
44
58
65
73
820
942
1029
1110
121
1338
144
158
1615
174
1838
192
202
217
228
2323
246
256
267
2728
2828
2915
302
312
3217
335
3412
352
3624
3717
3817
396
4022
417
427
4316
4416
454
466
4730
4813
494
55.69% Sentence opener variety
Target: ≥60% unique sentence openers
consecutiveRepeats11
diversityRatio0.4117647058823529
totalSentences85
uniqueOpeners35
92.59% Adverb-first sentence starts
Target: ≥3% sentences starting with an adverb
adverbCount2
totalSentences72
matches
0"Then something moved at the"
1"Then a third, behind her,"
ratio0.028
86.67% Pronoun-first sentence starts
Target: ≤30% sentences starting with a pronoun
pronounCount24
totalSentences72
matches
0"She'd kept going because Eva's"
1"It was October."
2"It pressed against her ears"
3"She could hear her own"
4"She should turn around."
5"She'd nearly forgotten she was"
6"She'd worn it because it"
7"Her voice didn't carry"
8"She told herself it was"
9"She told herself a lot"
10"She spun toward it."
11"She knew about adrenaline."
12"She knew about the body's"
13"She had used that knowledge"
14"She summoned it now, marshalled"
15"She started walking faster."
16"It hung fat and white"
17"It had been low then."
18"She tried to fix the"
19"Her heart slammed."
ratio0.333
78.06% Subject-first sentence starts
Target: ≤72% sentences starting with a subject
subjectCount55
totalSentences72
matches
0"The standing stones came up"
1"Rory had walked Richmond Park"
2"The path she'd followed had"
3"She'd kept going because Eva's"
4"The flowers didn't make sense."
5"It was October."
6"The cold had crept into"
7"The blossoms glowed faintly in"
8"Rory stopped at the threshold"
9"This silence had weight."
10"It pressed against her ears"
11"She could hear her own"
12"She should turn around."
13"That thought arrived calm and"
14"Whatever Eva wants can wait"
15"The pendant warmed against her"
16"She'd nearly forgotten she was"
17"The Heartstone had come to"
18"She'd worn it because it"
19"A faint, insistent pulse, like"
ratio0.764
100.00% Subordinate conjunction sentence starts
Target: ≥2% sentences starting with a subordinating conjunction
subConjCount2
totalSentences72
matches
0"Now it lay against her"
1"Now she walked, and walked,"
ratio0.028
46.33% Technical jargon density
Target: ≤6% sentences with technical-jargon patterns
analyzedSentences37
technicalSentenceCount5
matches
0"But here, in the hollow between the ancient oaks, the ground was soft with bluebells and cowslip and something pale and star-shaped she didn't have a name for, …"
1"Not the ordinary silence of a park at night, which was never truly silent — there was always the hum of the distant city, the drone of an airplane, the rustle o…"
2"That thought arrived calm and clear, the way her good thoughts always did, the cool-headed ones that had gotten her out of Cardiff and away from Evan and into a…"
3"She'd worn it because it was beautiful and because some part of her, the part that didn't say its reasons out loud, had felt safer with it on."
4"The clearing was larger inside than it had looked from the edge — that was her first concrete wrongness, the kind she could name."
100.00% Useless dialogue additions
Target: ≤5% dialogue tags with trailing filler fragments
totalTags4
uselessAdditionCount0
matches(empty)
0.00% Dialogue tag variety (said vs. fancy)
Target: ≤10% fancy dialogue tags
totalTags3
fancyCount1
fancyTags
0"she shouted (shout)"
dialogueSentences6
tagDensity0.5
leniency1
rawRatio0.333
effectiveRatio0.333
86.0505%