Run: 2026-02-17-01KHMQKD3F3HNX3HQ5C7VGX04N

Run Details

Duration:
1m 18s
Cost:
$0.075220
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 last train from Waterloo had deposited Rory at Richmond with seven minutes to spare before midnight, and she'd walked the rest of the way in the dark because she didn't trust herself to explain to a cab driver why she needed to be let out at the Isabella Plantation gate at this hour. The park was closed, of course. It had been closed since sunset. She climbed the fence where the iron railings dipped near the Petersham Road entrance, catching the hem of her jacket on a finial and tearing it as she dropped to the other side. The sound of the fabric ripping was louder than it should have been. Everything was louder than it should have been. She stood in the wet grass and waited for her eyes to adjust. The text had come from Eva's phone at half past nine. Three words: *The Grove. Tonight.* No follow-up. No context. Rory had called back four times and gotten voicemail each time — Eva's cheerful, slightly breathless recording, the one she'd made two years ago after too many ciders, the one that still ended with her laughing at something Rory couldn't remember. Each time the message played, Rory's stomach had tightened a little more, until by the fourth call she was already pulling on her trainers and zipping her jacket and leaving the flat above Silas's bar without locking the door behind her. Now she was here, in the black expanse of Richmond Park, and the Heartstone pendant was warm against her sternum. She touched it through her shirt — a reflex, like pressing a tongue to a sore tooth. The crimson gem had been doing this for three days now, pulsing with a faint heat she could feel even through fabric, and she'd been ignoring it the way she ignored most things she didn't want to understand. But here, in the dark, with the park stretched out around her like a held breath, ignoring it felt less like pragmatism and more like cowardice. She followed the path she knew by memory. Past the pond, where the water lay flat and dark as spilled ink. Through the avenue of chestnuts, their bare branches interlocking overhead like the ribcage of something enormous. The moon was behind clouds and offered nothing. She used the torch on her phone sparingly, in quick sweeps, because the battery was at nineteen percent and because every time she turned it on, the light seemed to stop shorter than it should have, as though the darkness ahead of her was denser, more solid, more reluctant to be pushed aside. She heard the deer before she saw them. A rustle in the bracken to her left, and then the heavy, deliberate sound of several large bodies moving away from her through the undergrowth. Red deer. Richmond was full of them. But they were moving in the wrong direction — away from the center of the park, toward the perimeter, toward the roads and the fences and the human noise they normally avoided. She watched their shapes pass between the trees, dark against dark, their antlers catching some faint ambient glow she couldn't source. They moved quickly. They moved like things that were leaving. The Heartstone pulsed. Warmth bloomed against her chest and faded, bloomed and faded, and Rory pressed her palm flat against it and kept walking. The standing stones came into view ten minutes later, though she couldn't have said exactly when she first noticed them. They didn't appear so much as accumulate — a thickening of shadow here, a too-regular shape there, until she was standing at the edge of the ring and the ancient oaks rose around her like dark pillars, their bark so weathered and grooved that it looked like petrified cloth. Wildflowers grew between them even now, even in November, small white and violet blooms that seemed to generate their own faint luminescence. She'd asked Isolde about that once. The fae woman had smiled in that unsettling way of hers and said the flowers didn't know what month it was. Rory stepped between two of the oaks and into the Grove. The air changed immediately. It was warmer on this side — not much, just enough to notice, like stepping into a room where someone had recently been sitting. The ground was soft. The wildflowers were thicker here, and their glow was stronger, enough that she could see the clearing in a pale wash of blue-white light. The grass was undisturbed. No one was here. "Eva?" she said, and her voice sounded wrong. Not wrong, exactly. Flat. The word left her mouth and went nowhere. In a normal clearing, even at night, sound would carry — bounce off trees, scatter into the sky, find its way to the ears of whatever small creatures were hiding in the undergrowth. Here, her voice traveled about six feet and stopped, as though it had hit something solid. The silence that followed wasn't empty. It was full. It was the silence of a room with someone in it who was choosing not to speak. Rory turned in a slow circle. The oaks stood at the perimeter of the clearing, evenly spaced, their canopy forming an unbroken ceiling overhead. Between them, beyond the boundary of the Grove, the park should have been visible — trees, paths, the distant amber smear of London's light pollution. But it wasn't. The spaces between the oaks were dark. Not nighttime dark. Not shadow dark. The kind of dark that looked like it had texture, like it would feel like something if she reached into it. She didn't reach into it. "Eva, if you're here, this isn't funny." The flatness swallowed her words again. She pulled out her phone. No signal. The battery read eleven percent now, though it had been nineteen only minutes ago. The clock on the screen said 12:07. She'd entered the park at midnight. She'd walked for at least twenty minutes. The math refused to work, and she let it go, because time in the Grove had never been reliable and thinking about it too hard was a door she didn't want to open tonight. She became aware of the sound gradually. It was underneath everything — underneath the nothing, underneath the suffocating quiet. A low, rhythmic vibration that she felt in the bones of her feet before she heard it with her ears. Not a hum, exactly. More like breathing. Slow, deep, steady breathing, as though the ground itself were drawing air and releasing it, and she was standing on the chest of something impossibly large. The Heartstone flared. Not the gentle pulse she'd grown accustomed to — this was a sharp, sudden burn, like a coal pressed against her skin, and she gasped and yanked the pendant out from under her shirt by its silver chain. The crimson gem was alight. Its inner glow, normally so faint she had to cup it in her hands and squint to see it, was now bright enough to cast her fingers in red, bright enough to throw her shadow behind her in a long, jagged streak. She looked at her shadow. Her shadow looked wrong. She was standing still. She was certain she was standing still. But the shadow on the grass behind her was moving — not in the way shadows moved when a light source shifted, not the gentle sway of a cast shape responding to the motion of the body that threw it. This was independent movement. Subtle, but unmistakable. The shadow's edges rippled and rearranged, as though something beneath the surface of it were adjusting its position. The head of the shadow turned, slowly, a degree or two to the left, while Rory's own head remained fixed. She stopped breathing. The shadow stopped moving. She stared at it for five seconds, ten seconds, fifteen. Nothing. Just a shadow. Just her shadow, thrown by the red glow of the Heartstone, motionless on the November grass. She exhaled. She told herself she'd imagined it. She was scared, and she was tired, and her brain was filling the silence with patterns that weren't there, the way brains did when— The breathing sound changed. It was still rhythmic, still deep, still coming from below and everywhere at once. But it was faster now. Not much. Just enough to notice. As though whatever was producing it had also been holding its breath, and had just released it, and was now settling into a new rhythm that was slightly, incrementally more urgent. Rory became aware — with the specific, crystalline clarity that came right before panic — that she could no longer see the spaces between the standing oaks. The darkness that had filled those gaps had thickened, had advanced, had crept inward while she'd been watching her shadow, and now it pressed against the oaks like water against a dam. The wildflowers at the perimeter of the clearing had gone dark. Their bioluminescence simply wasn't there anymore, as though something had placed a hand over each one and smothered the light. The remaining glow came only from the flowers at the center of the Grove, the ones closest to where she stood, and their light was dimmer now, wavering, uncertain. And from the Heartstone, which blazed against her palm like a small red star. She heard the cracking sound from her right. She snapped her head toward it. One of the standing oaks — the largest, the one she'd always used to orient herself when she entered the Grove — was moving. Not falling. Not bending. Moving. The deep grooves in its bark were rearranging themselves with slow, grinding deliberation, the petrified cloth of its surface folding and unfolding, and in the shifting patterns of its grain she saw — or thought she saw, or was terrified that she saw — the suggestion of a face. Not a human face. Something longer. Something with too many planes and angles, something that was trying to resolve itself into an expression she could read and not quite managing. She took a step backward. Her heel found soft earth. The breathing beneath her feet quickened again. The other oaks were doing it now. Every one of them, all the way around the clearing, the slow grinding rearrangement of their surfaces, the sense of vast attention turning toward a single point. Toward her. The face-shapes in the bark were all different. Some were almost recognizable — the long, severe lines of something fae, the hollow suggestion of eyes, the dark groove that might have been a mouth. Others were less coherent, more abstract, just the raw impression of *watching* rendered in wood and shadow. The Heartstone burned. The pendant swung on its chain, and Rory realized her hand was shaking. From somewhere beyond the ring of oaks — from inside the dark, from the place that was no longer the park and might never have been the park — something called her name. Not Eva's voice. Not anyone's voice. It was her name shaped from the sound of branches breaking, from the groan of old wood, from the exhalation of the breathing ground. *Aurora.* Not Rory. Not the name her friends used. Her full name, spoken with the care of someone who had learned it recently and wanted to get it right. She ran. She didn't choose a direction. She chose the gap between two oaks where the darkness looked thinnest, where she thought — hoped — prayed — the park still existed on the other side, and she threw herself at it. The wildflowers crunched under her trainers. The air thickened around her like cold water. The Heartstone screamed red light against her chest. She hit the boundary of the Grove and for one terrible, elongated moment she felt resistance — not physical, not a wall, but a reluctance, a vast and patient unwillingness to let her go, like pulling free from a hand that wasn't gripping but simply hadn't decided to open. Then she was through, and she was running across wet grass in the dark, and behind her the Grove was silent. She didn't stop until she reached the fence. She climbed it badly, cutting her left wrist on the finial — a bright line of pain across the old crescent scar she'd carried since childhood. She dropped to the pavement on the other side and pressed her back against the railings and looked at her phone. The screen read 12:09. Two minutes. She'd been in there for two minutes. The Heartstone cooled slowly against her chest, its glow fading to a faint ember, then to nothing. Rory sat on the wet pavement and listened to the sound of distant traffic and the normal, uncomplicated silence of a city at night, and she did not call Eva again, and she did not go back to the Grove, and she did not look at her shadow for a very long time.
created_at"2026-02-17T02:43:08.289656+00:00" 2/17/2026, 2:43:08 AM
model"anthropic/claude-4.6-opus-20260205"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency1416
moderation_latency(null)
generation_time77988
tokens_prompt812
tokens_completion3140
native_tokens_prompt839
native_tokens_completion2841
native_tokens_completion_images(null)
native_tokens_reasoning0
native_tokens_cached0
num_media_prompt(null)
num_input_audio_prompt(null)
num_media_completion0
num_search_results(null)
origin"https://ncbench.com/"
is_byokfalse
finish_reason"stop"
native_finish_reason"stop"
usage0.07522
router(null)
provider_responses
0
id"msg_01NgtRy7qg6GjDZvYTmsjaF9"
status200
is_byokfalse
latency1416
endpoint_id"c926c048-563e-44b0-8434-95965bee924c"
provider_name"Anthropic"
model_permaslug"anthropic/claude-4.6-opus-20260205"
api_type"completions"
id"gen-1771296109-IFZz5jp9jf4LdHRsUdyZ"
upstream_id"msg_01NgtRy7qg6GjDZvYTmsjaF9"
total_cost0.07522
cache_discount(null)
upstream_inference_cost0
provider_name"Anthropic"

Evaluation details

Result Evaluator Details Meta Data
100.0000% Adverbs in dialogue tags
Target: ≤10% dialogue tags with adverbs
totalTags1
adverbTagCount0
adverbTags(empty)
71.9626% AI-ism adverb frequency
Target: <1% AI-ism adverbs (57 tracked)
wordCount2140
totalAiIsmAdverbs6
found
0
adverb"quickly"
count1
1
adverb"slightly"
count2
2
adverb"slowly"
count2
3
adverb"very"
count1
highlights
0"quickly"
1"slightly"
2"slowly"
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)
90.6542% AI-ism word frequency
Target: <1% AI-ism words (140 tracked)
wordCount2140
totalAiIsms2
found
0
word"crystalline"
count1
1
word"wavering"
count1
highlights
0"crystalline"
1"wavering"
100.0000% Cliche density
Target: ≤1 cliche(s) per 800-word window
totalCliches0
maxInWindow0
found(empty)
highlights(empty)
100.0000% Emotion telling (show vs. tell)
Target: ≤3% sentences with emotion telling
emotionTells2
narrationSentences154
matches
0"was scared"
1"was terrified"
100.0000% Filter word density
Target: ≤12% sentences with filter/hedge words
filterCount0
hedgeCount2
narrationSentences154
filterMatches(empty)
hedgeMatches
0"seemed to"
100.0000% Overuse of "that" (subordinate clause padding)
Target: ≤10% sentences with "that" clauses
thatCount3
totalSentences155
matches
0"grooved that it"
1"panic — that she"
2"terrified that she"
100.0000% Paragraph length variance
Target: CV ≥0.5 for paragraph word counts
totalParagraphs43
mean50.23
std41.12
cv0.818
sampleLengths
0120
113
2102
320
481
598
6103
724
8118
911
1064
118
1287
1386
145
157
1681
177
1865
1988
205
214
2296
233
244
2562
264
2756
28119
2914
308
31114
3217
3387
3416
3533
3659
372
38110
3921
4068
4117
4253
100.0000% Passive voice overuse
Target: ≤5% passive sentences
passiveCount4
totalSentences154
matches
0"was closed"
1"been closed"
2"been nineteen"
3"was terrified"
100.0000% Past progressive (was/were + -ing) overuse
Target: ≤10% past progressive verbs
pastProgressiveCount18
totalVerbs338
matches
0"were moving"
1"were leaving"
2"was standing"
3"were hiding"
4"was choosing"
5"were drawing was standing"
6"was standing"
7"was standing"
8"was moving "
9"were adjusting"
10"was filling"
11"was producing"
12"were rearranging"
13"was trying"
14"were doing"
15"was shaking"
16"was running"
90.8316% Purple prose (modifier overload)
Target: <4% adverbs, <2% -ly adverbs, no adj stacking
wordCount2132
adjectiveStacks1
stackExamples
0"Slow, deep, steady breathing,"
adverbCount93
adverbRatio0.04362101313320826
lyAdverbCount23
lyAdverbRatio0.010787992495309569
100.0000% Repeated phrase echo
Target: ≤20% sentences with echoes (window: 2)
totalSentences155
echoCount0
echoWords(empty)
100.0000% Sentence length variance
Target: CV ≥0.4 for sentence word counts
totalSentences155
mean13.94
std12.89
cv0.925
sampleLengths
054
16
26
333
413
58
613
711
84
93
102
1141
1241
1320
1417
1538
1626
178
1813
1916
208
2153
228
2325
242
255
2632
2721
283
297
303
3121
3220
3349
3422
356
3621
3711
384
3924
404
4124
424
434
448
453
461
478
4833
4916
33.1183% Sentence opener variety
Target: ≥60% unique sentence openers
consecutiveRepeats27
diversityRatio0.3032258064516129
totalSentences155
uniqueOpeners47
100.0000% Dialogue tag variety (said vs. fancy)
Target: ≤30% fancy dialogue tags
totalTags1
fancyCount0
fancyTags(empty)
93.3275%