NC Bench
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Run: 2026-02-17-01KHMMRCABGG0Y4XT3AVP4GVFT
Run Details
Model:
Claude 3.7 Sonnet
Test:
Bad Writing Habits
Scenario:
Mystery: examining a crime scene
Duration:
43.5s
Cost:
$0.036201
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="4416" name="Detective Harlow Quinn" aliases="Quinn, Detective Quinn, Harlow" pronouns="she/her" species="Human" storyRole="Antagonist"> <eyeColor>brown</eyeColor> <hair>closely cropped salt-and-pepper</hair> <height>5'9"</height> <age>41</age> <jawline>sharp jaw</jawline> <watch>worn leather watch on her left wrist</watch> <bearing>military precision</bearing> <description>A Metropolitan Police detective with 18 years of decorated service who suspects the clique is involved in criminal activity.</description> <backstory>She lost her partner, DS Morris, during a case three years ago under unexplained circumstances that had supernatural origins she doesn't yet understand.</backstory> </character> <character id="4414" name="Eva Kowalski" aliases="Eva, Evie" pronouns="she/her" species="Human" storyRole="Best Friend"> <eyeColor>green</eyeColor> <hair>curly red</hair> <height>5'4"</height> <age>26</age> <glasses>round glasses</glasses> <satchel>worn leather satchel full of books</satchel> <freckles>freckled complexion</freckles> <nervousHabit>tucking hair behind her left ear</nervousHabit> <description>Aurora's childhood friend and an occult researcher.</description> <backstory>Moved to London two years before Aurora and works as a research assistant at the British Museum's restricted archives. She holds a master's degree in Ancient History from Oxford.</backstory> </character> <location id="856" name="The Veil Market" aliases="Veil Market, the Market, underground market" realm="Earth"> <currentLocation>abandoned Tube station beneath Camden</currentLocation> <entryRequirement>bone token</entryRequirement> <schedule>moves locations every full moon</schedule> <description>A hidden supernatural black market that sells enchanted goods, banned alchemical substances, and information.</description> </location> <item id="2004" name="Veil Compass" aliases="the Compass, shadow compass" type="Tool" origin="The Veil Market"> <casingMaterial>small brass compass</casingMaterial> <faceMarkings>face etched with protective sigils</faceMarkings> <needle>points toward the nearest supernatural rift or portal</needle> <patina>casing has a patina of verdigris</patina> <creator>crafted by a Shade artisan</creator> <description>A compass attuned to supernatural energy.</description> </item> </codex> Write a fully fleshed out scene of at least 1000 words in the mystery genre. A detective arrives at a crime scene in an unusual location. Something is wrong — the evidence doesn't add up. A colleague is present, offering a different interpretation. Through careful observation and deduction, the detective begins to see what others have missed. Use the codex entries above as your world reference for characters and setting. Only include the prose of the scene without any markdown or commentary.
Model response
Messages
Meta
AI
Harlow Quinn ducked under the caution tape strung across the entrance to Camden Town station. It was nearly midnight, and Transport Police had sealed off the premises hours ago. The night air carried a chill that worked through her light
weight
blazer, but the discomfort barely registered. Her attention
was locked
on the scene ahead. "Another suicide, they're saying." The uniform at the entrance glanced at her warrant card before lifting the tape higher. "Body was found at the bottom of the northbound escalator." Quinn nodded without commenting. Suicides weren't her department's jurisdiction, but something in the initial report had caught her attention. The call had come through as a standard fatality, but the responding officer had noted "unusual markings" at the scene. The station was eerily quiet without the rush of commuters. Quinn's
footsteps
echoed
on the tiled floor as she made her way to the escalators, now frozen in place. The forensic team had already set up portable
lights that cast
harsh shadows across the scene. At the bottom of the escalator lay a body covered by a standard-issue sheet. Dr.
Patel
, the on-call pathologist, knelt beside it, dictating notes into a small recorder. "Time of death, approximately 9:15 PM. Male, Caucasian, mid-thirties..." Quinn approached, taking care not to disturb anything. "Evening, Doctor. Mind if I take a look?"
Patel
glanced up, recognition flickering across his face. "Detective Quinn. Didn't expect Homicide for this one." He gestured toward the covered body. "Initial assessment suggests suicide. Blunt force trauma consistent with a fall down the escalator. Transport Police footage shows him alone on the platform before the incident." Quinn crouched beside the pathologist. "What about these unusual markings in the report?" "Ah, that."
Patel
carefully
folded back the sheet. "These aren't from the fall." The victim's arm was exposed, revealing a series of
intricate
patterns
etched
into the skin. Not tattoos—these were fresher, almost like brands or scarification, but with a precision that seemed impossible for conventional tools. Quinn leaned closer, her brow
furrowing
. She'd seen similar markings before, three years ago, on the night DS Morris disappeared. She'd been trying to make sense of them ever since. "Can I get some space, please?" she asked, reaching for the latex gloves in her pocket. As the pathologist stepped away, Quinn
carefully
examined the markings without touching them. They
seemed to
form a circular pattern, like coordinates or a map. The skin around them
was unmarred
—no inflammation, no sign of trauma beyond the markings themselves. "Find something interesting?" The voice came from behind her, familiar in its lilting academic tone. Quinn straightened, turning to find Eva Kowalski standing a few feet away, her round glasses reflecting the forensic lights. Her curly red hair
was pulled
into a hasty ponytail, and she clutched her worn leather satchel against her hip. "Ms. Kowalski." Quinn's voice cooled several degrees. "This is a restricted crime scene. How did you get past the cordon?" Eva tucked a loose strand of hair behind her left ear, a nervous habit Quinn had noted in their previous encounters. "I have clearance from the Museum's special collections department." She produced an ID card. "We were notified about potential artifacts of interest." Quinn's jaw tightened. This wasn't the first time the British Museum had inserted itself into her investigations, and Eva's repeated presence at these scenes was becoming more than coincidental. "Those markings," Eva continued, stepping closer despite Quinn's obvious displeasure. "They're navigation sigils." "Navigation to where, exactly?" Quinn asked, keeping her tone neutral despite her suspicion. Eva adjusted her glasses. "That depends on how you read them. May I?" She gestured toward the body. Against her better judgment, Quinn stepped aside. Eva knelt, setting her satchel on the ground and pulling out a small notebook. She began sketching the markings rapidly. "These aren't random," Eva murmured. "See how this line intersects with these three points? It's a locator system." Quinn checked her
watch
, the worn leather band a familiar
weight
against her wrist. 11:48 PM. "I don't have time for cryptic explanations, Ms. Kowalski. If you know something relevant to this investigation—" "The Veil Market," Eva interrupted, her green eyes meeting Quinn's. "These are coordinates to find it." Quinn stiffened. The Veil Market was nothing more than an urban legend, a fairy tale criminals told each other about a place to buy and sell things that couldn't be traded openly. She'd dismissed it as fiction during her eighteen years on the force. "That's not helpful," she said flatly. Eva stood, tucking the notebook away. "Detective, I know you think I'm interfering, but we're looking for the same answers." She reached into her satchel and withdrew a small brass object. "This might help you understand." Quinn eyed the item—a small compass with a tarnished brass casing covered in a greenish patina. Its face
was etched
with markings similar to those on the victim's arm. "What is this supposed to be?" "It's called a Veil Compass," Eva explained. "It points toward supernatural rifts rather than
magnetic
north." Quinn nearly laughed. "Supernatural rifts. Right." She turned back to the body. "I'll stick to evidence I can present in court, thanks." Eva sighed. "Look at his pockets. I'll bet you anything he was carrying a bone token." Quinn hesitated, then nodded to the pathologist. "Doctor, was anything recovered from the victim's pockets during your preliminary examination?"
Patel
consulted his notes. "Yes, actually. Several items including a wallet, keys, and an unusual carved object. They're bagged for evidence." Quinn followed him to the evidence table, where several sealed plastic bags
were laid
out. In one, she could see what
appeared to
be a small white token, carved from some kind of dense material. It wasn't plastic or ivory... "May I?" she asked, picking up the bag. The object inside was unmistakably carved from bone, with similar markings to those on the victim's arm. Eva had followed them. "It's an entry token," she said quietly. "The Veil Market requires one for admission." Quinn turned the evidence bag over in her hand, her mind racing. The markings, the bone token—they matched patterns in the case file she'd been building since Morris disappeared. A case her superiors had ordered her to close months ago. "The victim wasn't running away from something," Eva continued. "He was running toward something. The escalator doesn't just go down to the platform. There's an access tunnel, sealed off decades ago when they renovated this station." "And how would you
know that?" Quinn
asked. "Research assistant, remember? The British Museum has original plans for most of London's underground." Eva tapped her satchel. "The Veil Market uses abandoned spaces, moving locations with each full moon. Tonight's the full moon." Quinn checked her
watch
again. 11:55 PM. "If we hurry, we might catch it before it moves," Eva added. Quinn studied Eva's face, searching for deception and finding only earnest intensity. Everything in her training told her to dismiss this supernatural nonsense, to process the scene by the book. But the markings on Morris's case file had haunted her for three years, and here they were again. "Doctor," she said finally, "I need to examine the access areas below this level. Ms. Kowalski has identified a possible escape route our victim might have been heading for."
Patel
nodded. "I'll continue here. The Transport Police mentioned maintenance tunnels beyond the platform level." Quinn gestured for Eva to lead the way. As they descended to the platform, Quinn kept her voice low. "If this is some kind of game, Ms. Kowalski, I'll have you charged with obstruction." Eva didn't respond immediately. Instead, she pulled out the brass compass and held it flat on her palm. The needle spun wildly before settling, pointing not north but toward the end of the platform. "It's still there," Eva whispered. "The Market hasn't moved yet." Quinn followed Eva's gaze to what
appeared to
be a solid wall at the platform's end. As they approached, Quinn noticed a thin seam in the tiling—not random damage, but a deliberate line forming the outline of a doorway. "How do we open it?" she asked, professional curiosity temporarily overriding her skepticism. Eva reached for the evidence bag still in Quinn's hand. "May I?" Quinn hesitated, then handed it over. Eva
carefully
removed the bone token and held it up to a small indentation in the wall, barely visible unless you knew to look for it. The seam in the wall widened silently, revealing a dark passage beyond. "After you, Detective," Eva said, tucking a strand of hair behind her ear. "The Veil Market awaits." Quinn paused at the threshold, years of police training screaming caution. But something else—the memory of Morris's face the night he vanished, the unsolved questions that had plagued her for three years—pushed her forward. "Stay behind me," she instructed, drawing her service weapon. "And
keep that compass
where I can see it." As they stepped through the doorway, Quinn couldn't shake the feeling that the case was finally, after three long years, breaking open—though not in any way she could have anticipated. Whatever lay ahead in the darkness, she was certain of one thing: the evidence had been pointing here all along, if only she'd known how to read it.
created_at
"2026-02-17T01:52:50.753234+00:00"
2/17/2026, 1:52:50 AM
model
"anthropic/claude-3-7-sonnet-20250219"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
506
moderation_latency
(null)
generation_time
43399
tokens_prompt
923
tokens_completion
2500
native_tokens_prompt
937
native_tokens_completion
2226
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
0.036201
router
(null)
provider_responses
0
id
"msg_01GyWn5ndBDSXGM4H5Yjby6C"
status
200
is_byok
false
latency
505
endpoint_id
"1347c8dc-12f5-47df-8355-3ec7e80a8c67"
provider_name
"Anthropic"
model_permaslug
"anthropic/claude-3-7-sonnet-20250219"
api_type
"completions"
id
"gen-1771293127-8MGODdiJBDcEZyIOoeoG"
upstream_id
"msg_01GyWn5ndBDSXGM4H5Yjby6C"
total_cost
0.036201
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Anthropic"
Evaluation details
Result
Evaluator
Details
Meta Data
74.5098%
Adverbs in dialogue tags
Target: ≤10% dialogue tags with adverbs
totalTags
17
adverbTagCount
3
adverbTags
0
"she said flatly [flatly]"
1
"she said quietly [quietly]"
2
"she said finally [finally]"
80.6327%
AI-ism adverb frequency
Target: <1% AI-ism adverbs (57 tracked)
wordCount
1549
totalAiIsmAdverbs
3
found
0
adverb
"carefully"
count
3
highlights
0
"carefully"
80.0000%
AI-ism character names
Target: 0 AI-default names (17 tracked, −20% each)
codexExemptions
(empty)
found
0
"Patel"
100.0000%
AI-ism location names
Target: 0 AI-default location names (33 tracked, −20% each)
codexExemptions
(empty)
found
(empty)
48.3538%
AI-ism word frequency
Target: <1% AI-ism words (140 tracked)
wordCount
1549
totalAiIsms
8
found
0
word
"intricate"
count
1
1
word
"magnetic"
count
1
2
word
"furrowing"
count
1
3
word
"weight"
count
1
4
word
"footsteps"
count
1
5
word
"echoed"
count
1
6
word
"etched"
count
2
highlights
0
"intricate"
1
"magnetic"
2
"furrowing"
3
"weight"
4
"footsteps"
5
"echoed"
6
"etched"
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
101
matches
(empty)
100.0000%
Filter word density
Target: ≤12% sentences with filter/hedge words
filterCount
2
hedgeCount
3
narrationSentences
101
filterMatches
0
"watch"
hedgeMatches
0
"seemed to"
1
"appeared to"
100.0000%
Overuse of "that" (subordinate clause padding)
Target: ≤10% sentences with "that" clauses
thatCount
3
totalSentences
129
matches
0
"lights that cast"
1
"know that?\" Quinn"
2
"keep that compass"
100.0000%
Paragraph length variance
Target: CV ≥0.5 for paragraph word counts
totalParagraphs
60
mean
25.63
std
13.02
cv
0.508
sampleLengths
0
54
1
29
2
39
3
45
4
28
5
9
6
16
7
48
8
13
9
13
10
34
11
30
12
16
13
40
14
15
15
39
16
20
17
43
18
29
19
13
20
13
21
18
22
27
23
18
24
33
25
16
26
44
27
6
28
36
29
29
30
6
31
16
32
22
33
16
34
19
35
21
36
40
37
25
38
18
39
40
40
36
41
8
42
34
43
7
44
12
45
48
46
29
47
15
48
34
49
34
100.0000%
Passive voice overuse
Target: ≤5% passive sentences
passiveCount
5
totalSentences
101
matches
0
"was locked"
1
"was unmarred"
2
"was pulled"
3
"was etched"
4
"were laid"
100.0000%
Past progressive (was/were + -ing) overuse
Target: ≤10% past progressive verbs
pastProgressiveCount
0
totalVerbs
191
matches
(empty)
99.7851%
Purple prose (modifier overload)
Target: <4% adverbs, <2% -ly adverbs, no adj stacking
wordCount
1086
adjectiveStacks
0
stackExamples
(empty)
adverbCount
36
adverbRatio
0.03314917127071823
lyAdverbCount
22
lyAdverbRatio
0.020257826887661142
100.0000%
Repeated phrase echo
Target: ≤20% sentences with echoes (window: 2)
totalSentences
129
echoCount
0
echoWords
(empty)
100.0000%
Sentence length variance
Target: CV ≥0.4 for sentence word counts
totalSentences
129
mean
11.92
std
6.65
cv
0.558
sampleLengths
0
15
1
14
2
17
3
8
4
19
5
10
6
4
7
15
8
20
9
10
10
19
11
16
12
14
13
1
14
13
15
9
16
8
17
8
18
8
19
14
20
26
21
5
22
8
23
8
24
5
25
15
26
19
27
6
28
14
29
10
30
16
31
13
32
12
33
15
34
15
35
19
36
20
37
7
38
13
39
21
40
14
41
8
42
3
43
26
44
10
45
3
46
13
47
4
48
14
49
7
67.4419%
Sentence opener variety
Target: ≥60% unique sentence openers
consecutiveRepeats
3
diversityRatio
0.4186046511627907
totalSentences
129
uniqueOpeners
54
0.0000%
Dialogue tag variety (said vs. fancy)
Target: ≤30% fancy dialogue tags
totalTags
17
fancyCount
12
fancyTags
0
"Eva continued, stepping closer despite Quinn's obvious displeasure (continue, step)"
1
"Eva murmured (murmur)"
2
"Eva interrupted, her green eyes meeting Quinn's (interrupt)"
3
"she said flatly (say flatly)"
4
"Eva explained (explain)"
5
"she said quietly (say quietly)"
6
"Eva continued (continue)"
7
"Eva added (add)"
8
"she said finally (say finally)"
9
"Eva whispered (whisper)"
10
"Eva said, tucking a strand of hair behind her ear (say, tuck)"
11
"she instructed, drawing her service weapon (instruct, draw)"
85.3367%