NC Bench
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Run: 2026-02-17-01KHMQQ7CAZP39HFCTGRQNSR77
Run Details
Model:
Claude Opus 4.5
Test:
Bad Writing Habits
Scenario:
Horror: alone in an eerie place at night
Duration:
51.8s
Cost:
$0.060265
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> <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
Messages
Meta
AI
The last light of dusk bled away behind the treeline as Rory ducked through the gap in the iron fence. Richmond Park had closed an hour ago, but the rusted section near the Pen Ponds had been loose since she was a teenager sneaking in with Eva to drink stolen wine and pretend they were somewhere far from Cardiff. Tonight she'd come alone, and sober, and for reasons she couldn't quite articulate even to herself. The envelope had arrived three days ago. No return address, no signature. Just a photograph of the standing stones and a date written in cramped handwriting: *Tonight. Midnight. Answers.* She should have thrown it away. Should have shown it to Silas, or at least mentioned it to Yu-Fei when she'd picked up her delivery bag that morning. Instead she'd tucked it into her jacket pocket and spent the day pretending she
wasn't counting
down the hours. The Heartstone pendant lay against her collarbone, cold for once. It had been warm all week, that subtle pulse she'd learned to associate with danger, but now it sat inert against her skin like ordinary jewelry. She touched it through her shirt as she walked, seeking reassurance that didn't come. The path through the woods was darker than it should have been. Rory had walked this route a dozen times before, knew the way the moonlight usually filtered through the oak canopy and painted silver patterns on the undergrowth. Tonight the trees
seemed to
lean inward, their branches interlocking overhead like clasped fingers. The wildflowers that lined the path—those impossible blooms that appeared regardless of season—had closed their petals. She'd never seen them do that before. Something rustled in the bracken to her left. Rory stopped, her breath catching. She waited, counting heartbeats, but the sound didn't repeat. A fox, probably. Or a badger. Richmond Park was full of wildlife that emerged after the gates closed. She'd startled deer on this path before, watched them freeze in the torchlight before bounding away into the darkness. She kept walking, but her pace had slowed. The standing stones weren't far now—she could just make out the first of them through the trees, that ancient oak pillar that marked the boundary of the grove. The air changed as she approached, growing heavier, damper, carrying a scent like petrichor mixed with something older. Something that reminded her of the cellar beneath her grandmother's cottage in Pembrokeshire, where the stones had wept moisture even in high summer. The grove opened before her, and Rory felt the wrongness settle into her bones. It looked the same as always—the circle of standing stones, each one carved from oak so old it had petrified into something harder than wood. The clearing in the center where the grass grew impossibly green. The wildflowers ringing the perimeter, their usual riot of colors muted in the darkness to shades of grey. But the silence was absolute. No insects. No distant traffic from the A307. No wind in the leaves overhead. Rory stood at the edge of the grove and listened to nothing. She checked her phone. 11:47. Thirteen minutes early. Whoever had sent the envelope might not have arrived yet. Or they might be watching from the trees, waiting to see if she'd come alone. Her hand drifted to the pendant again, pressing it against her chest as if she could will it to respond. Nothing. The stone remained cold. She stepped into the grove. The boundary crossing hit her like it always did—that subtle shift in pressure, the momentary vertigo that came from stepping into a place that existed between one world and another. The Fae Grove operated by its own rules. Time moved strangely here. An hour inside could be minutes outside, or days. She'd learned that the hard way, once, emerging from a twenty-minute conversation with Isolde to find that she'd missed two shifts at the restaurant. Tonight, though, something else came with the crossing. A prickling sensation at the back of her neck, like invisible fingers trailing up her spine. Rory spun around, scanning the trees beyond the stone circle, but saw only darkness between the trunks. "Hello?" Her voice came out smaller than she'd intended. She cleared her throat and tried again. "I got your message. I'm here." The silence swallowed her words. They didn't
echo
, didn't fade naturally into the night. They simply stopped, cut off as if by a wall of glass. Rory moved toward the center of the grove, stepping
carefully
around the stones. The grass was wet beneath her trainers, though it hadn't rained in days. Each footstep made a soft squelching sound that seemed impossibly loud in the quiet. She reached the center and turned in a slow circle, surveying the grove. The standing stones
loomed
around her, their surfaces rough and ancient, carved with symbols she'd never been able to read. In daylight, they looked almost friendly—relics of a time before the world had hardened into its current shape. Now, in the darkness, they
seemed to
lean inward. Watching. Something moved at the edge of her vision. Rory whipped her head to the left, but there was only the stone pillar, motionless and impassive. She could have sworn she'd seen something—a
flicker
of movement, a shape detaching itself from the darkness between two stones—but now there was nothing. Her heart
was beating
faster. She pressed her hand flat against her chest, feeling the Heartstone pendant dig into her palm. Still cold. Still dead. 11:52. "If this is some kind of test," she said, hating the tremor in her voice, "I'd
really
appreciate
know
ing the rules." No answer. But this time, when the silence returned, it felt different. Expectant. Like the grove
was holding
its breath. Rory became aware of a sound. So faint at first that she thought she might be imagining it—a low, rhythmic noise, like breathing. Slow and deep and not quite human. It
seemed to
come from everywhere and nowhere, emanating from the stones themselves or from the earth beneath her feet. She turned again, slower this time, trying to locate the source. The standing stones stood in their eternal circle, unchanged. The flowers remained closed, their pale petals catching what little moonlight filtered through the canopy. The grass— The grass was wrong. She hadn't noticed it when she'd entered, but now she could
see that the
green blades were bent at odd angles, pressed down in patterns that hadn't been there before. Lines radiating out from where she stood, like something heavy had crawled through the clearing. Like something was still crawling, circling her position just beyond the range of her vision. The breathing sound grew louder. Rory's hand closed around the pendant, yanking it from beneath her shirt. The silver chain bit into the back of her neck as she held the stone up, as if it could protect her. The crimson gem caught the moonlight and for just a moment—a fraction of a second—she thought she saw it pulse. Then the lights went out. Not gradually, not like clouds passing over the moon. One moment she could see the clearing around her, the standing stones, the pressed-down paths in the grass. The next moment there was only darkness, absolute and complete, as if someone had thrown a blanket over the entire grove. Rory didn't scream. She wanted to—felt the sound building in her throat—but some instinct kept her silent. Don't make noise. Don't let it
know
where you are. The breathing continued. Closer now. She could feel something in the darkness with her. A presence, massive and patient, circling the spot where she stood frozen. She couldn't see it—couldn't see anything—but she knew it was there. The air moved differently when it passed, stirred by something large displacing it. And beneath the smell of petrichor and old stone, she caught another scent. Iron. Old blood. The copper-and-rust smell of a wound gone septic. The pendant flared hot against her palm. The heat was so sudden, so intense, that Rory nearly dropped it. But she held on, clutching the Heartstone like a lifeline as its glow pushed back the darkness. Not much—barely a foot in any direction—but enough to
see that the
grass around her feet had
been pressed
flat in a perfect circle. Something had been walking around her. Something was still walking, just beyond the edge of the light. She heard
footsteps
now. Heavy, uneven, like something walking on too many legs. They circled her position, never quite entering the pendant's glow, staying just at the threshold where darkness began. And then, from somewhere behind her, a voice. "You came." Rory spun around. The light from the pendant stretched further for just a moment, illuminating a figure standing between two standing stones. A woman—or something shaped like a woman. Tall and thin, dressed in what might have been a gown or might have been shadows given form. Her face was pale, her features too sharp, and her eyes reflected the pendant's light like an animal's. "You sent the letter," Rory said. It wasn't a question. The woman smiled. Her teeth were too numerous for her mouth. "I have answers for you, Aurora Carter. Questions you've been asking since the pendant found you. Questions about what you are, and what you're meant to become." The breathing sound had stopped. The circling presence had gone still. The grove
seemed to
contract around them, the standing stones leaning in to listen. "But first," the woman said, and her smile widened further than any human jaw should allow, "you have to tell me what you're willing to pay." Rory's fingers tightened around the pendant. Its warmth pulsed against her palm, steady as a heartbeat—or a warning. Behind her, in the darkness beyond the light, something large shifted its
weight
and exhaled.
created_at
"2026-02-17T02:44:47.18705+00:00"
2/17/2026, 2:44:47 AM
model
"anthropic/claude-4.5-opus-20251124"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
3460
moderation_latency
213
generation_time
51506
tokens_prompt
812
tokens_completion
2526
native_tokens_prompt
838
native_tokens_completion
2243
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
0.060265
router
(null)
provider_responses
0
id
"49dcaa43-ebca-442c-8ef2-9d9650ea4043"
status
200
is_byok
false
latency
3460
endpoint_id
"de32581c-2e11-4f54-8d29-e8a6e19d3038"
provider_name
"Amazon Bedrock"
model_permaslug
"anthropic/claude-4.5-opus-20251124"
api_type
"completions"
id
"gen-1771296234-XHIMwWoCmwfr2rvTGMzH"
upstream_id
"49dcaa43-ebca-442c-8ef2-9d9650ea4043"
total_cost
0.060265
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Amazon Bedrock"
Evaluation details
Result
Evaluator
Details
Meta Data
22.2222%
Adverbs in dialogue tags
Target: ≤10% dialogue tags with adverbs
totalTags
3
adverbTagCount
1
adverbTags
0
"the woman said, and her smile widened further than any human jaw should allow [further]"
87.9445%
AI-ism adverb frequency
Target: <1% AI-ism adverbs (57 tracked)
wordCount
1659
totalAiIsmAdverbs
2
found
0
adverb
"carefully"
count
1
1
adverb
"really"
count
1
highlights
0
"carefully"
1
"really"
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)
69.8614%
AI-ism word frequency
Target: <1% AI-ism words (140 tracked)
wordCount
1659
totalAiIsms
5
found
0
word
"flicker"
count
1
1
word
"loomed"
count
1
2
word
"weight"
count
1
3
word
"footsteps"
count
1
4
word
"echo"
count
1
highlights
0
"flicker"
1
"loomed"
2
"weight"
3
"footsteps"
4
"echo"
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
142
matches
(empty)
100.0000%
Filter word density
Target: ≤12% sentences with filter/hedge words
filterCount
1
hedgeCount
4
narrationSentences
142
filterMatches
0
"know"
hedgeMatches
0
"seemed to"
100.0000%
Overuse of "that" (subordinate clause padding)
Target: ≤10% sentences with "that" clauses
thatCount
4
totalSentences
145
matches
0
"learned that the find that she'd"
1
"see that the"
2
"see that the"
100.0000%
Paragraph length variance
Target: CV ≥0.5 for paragraph word counts
totalParagraphs
50
mean
32.7
std
23.42
cv
0.716
sampleLengths
0
75
1
29
2
47
3
50
4
76
5
8
6
51
7
77
8
14
9
54
10
19
11
12
12
53
13
5
14
5
15
75
16
41
17
22
18
26
19
40
20
61
21
8
22
41
23
25
24
1
25
21
26
20
27
50
28
37
29
4
30
60
31
5
32
54
33
5
34
48
35
27
36
5
37
69
38
7
39
70
40
31
41
8
42
2
43
65
44
10
45
38
46
25
47
26
48
18
49
15
100.0000%
Passive voice overuse
Target: ≤5% passive sentences
passiveCount
1
totalSentences
142
matches
0
"been pressed"
100.0000%
Past progressive (was/were + -ing) overuse
Target: ≤10% past progressive verbs
pastProgressiveCount
3
totalVerbs
273
matches
0
"wasn't counting"
1
"was beating"
2
"was holding"
97.1236%
Purple prose (modifier overload)
Target: <4% adverbs, <2% -ly adverbs, no adj stacking
wordCount
1594
adjectiveStacks
0
stackExamples
(empty)
adverbCount
69
adverbRatio
0.04328732747804266
lyAdverbCount
17
lyAdverbRatio
0.01066499372647428
100.0000%
Repeated phrase echo
Target: ≤20% sentences with echoes (window: 2)
totalSentences
145
echoCount
0
echoWords
(empty)
100.0000%
Sentence length variance
Target: CV ≥0.4 for sentence word counts
totalSentences
145
mean
11.28
std
7.63
cv
0.677
sampleLengths
0
20
1
39
2
16
3
7
4
5
5
15
6
1
7
1
8
6
9
22
10
19
11
10
12
26
13
14
14
12
15
27
16
14
17
16
18
7
19
8
20
5
21
9
22
3
23
3
24
12
25
19
26
8
27
28
28
18
29
23
30
14
31
25
32
11
33
18
34
5
35
2
36
6
37
6
38
12
39
4
40
1
41
3
42
10
43
15
44
20
45
1
46
4
47
5
48
30
49
8
44.5221%
Sentence opener variety
Target: ≥60% unique sentence openers
consecutiveRepeats
18
diversityRatio
0.34265734265734266
totalSentences
143
uniqueOpeners
49
8.3333%
Dialogue tag variety (said vs. fancy)
Target: ≤30% fancy dialogue tags
totalTags
3
fancyCount
2
fancyTags
0
"she said, hating the tremor in her voice (say, hate)"
1
"the woman said, and her smile widened further than any human jaw should allow (say, widen further allow)"
84.1181%