NC Bench
Overview
About
Tests
Models
Vendors
Run: 2026-02-17-01KHMQR93PVNXC5JVGWEQ0ZE6D
Run Details
Model:
Claude Haiku 4.5
Test:
Bad Writing Habits
Scenario:
Fantasy: entering an ancient ruin
Duration:
23.5s
Cost:
$0.011522
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> <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 air shifted the moment they crossed the boundary. Aurora felt it first—a subtle pressure change, like ascending in an airplane, except there'd been no climb. One step beyond the ancient oak standing stones that ringed the grove, and the world breathed differently. The London haze that had clung to Richmond Park all morning simply... ceased to exist. The sky above was clearer than she'd ever seen it, a
crystalline
blue unmarred by cloud or smog, and the light fell at an angle that didn't match the sun's actual position in the real world. She stopped, her eyes adjusting. Behind her, Nyx
flickered
into sharper focus, their violet eyes brightening in the strange luminescence. The Shade preferred incorporeal form, but Isolde had insisted they become solid for this—trust was best demonstrated in flesh, even if that flesh was living shadow. "It's real," Aurora whispered. "Of course it's real," Isolde said, already three steps ahead of them. The Half-Fae moved without walking, as though she was less moving through space and more manifesting in new locations. Her silver hair caught the alien light and threw it back in fractals. "Did you doubt?" "I doubted," Nyx said, their voice like wind through dead leaves. They looked down at their solid form with something approximating wonder. "Four centuries since I felt ground beneath me. Truly felt it." The grove opened before them like a secret. The clearing was perhaps two acres, ringed entirely by wildflowers in impossible bloom—lavender, moonflowers, and roses of a silver-white that Aurora had never seen in any garden center. The ground beneath their feet was soft, moss-like, but springy enough to cushion each step. It smelled like rain and green things and something else, something almost like cinnamon or cardamom, warm and spiced. Aurora moved deeper, drawn toward the center of the clearing where a ring of boulders sat arranged like a gathering place. Or an altar. "How long has this been here?" "Longer than your civilization has names for time," Isolde said. She settled onto one of the stones with fluid grace, her pale lavender eyes catching the light. "The Fae Courts anchored it when the Veil was young. Before the wars. Before the binding." That was Isolde's way of speaking—fragments of knowledge offered like riddles, truths nested inside truths. Aurora
was learning
to parse her, though it was like trying to read a book written in a language adjacent to English. Possible, but requiring constant reassessment. Nyx had stopped at the edge of the wildflower ring, their shadowed form contrasting
sharply
against the vivid blooms. They raised one hand, and Aurora could see it trembling
slightly
—whether from emotion or from the strain of maintaining solid form, she couldn't tell. "There's iron in the soil here," Nyx said. "Old iron. From weapons, I think. Many weapons." Aurora's hand moved instinctively to the Fae-forged blade at her hip. The moonsilver dagger felt colder than usual, responsive to proximity with this place. "A battlefield?" "A threshold," Isolde corrected. "Where choices were made. Where sides were chosen." The Seer rose without any visible effort and
glided
toward a cluster of stones near the northern edge of the grove. She gestured, and Aurora followed, Nyx trailing behind like a living shadow cast in the wrong direction by the wrong sun. As they approached, Aurora
began to
see what Isolde had wanted them to find. The stones weren't natural formations—they
were worked
, carved with symbols that predated any alphabet she recognized. The first symbol was a circle, bisected by a vertical line. The next, a crown of thorns. The third, something that looked almost like wings, or perhaps a door opening. "A language," Aurora breathed. "The old language," Isolde said. She touched one of the stones, her fingertips passing over the carved symbols with reverence. "Before Fae, before Hel, before the Sundering. When the worlds were still one, and angels walked beside mortals." Aurora's throat tightened. The implications were staggering. She pulled out her phone—its screen
flickered
and died within two steps of the stones—and instead began sketching the symbols on the small notebook she always carried. Her hand moved
quickly
, capturing angles and curves, trying to imprint the images into muscle memory the way the blade had taught her. Nyx had moved to stand before one particular stone, the tallest of them all. Their shadowed form
seemed to
vibrate against its surface, and when they spoke, their voice carried a strange harmonic quality. "I remember this," Nyx said quietly. "Not from my human life. From after. From the long years between, when I was nothing but smoke and hunger." They turned to face Aurora, their violet eyes brighter than she'd ever seen them. "This stone marked a gate. A gate that opened when the Veil was thin. When summoning rituals could work." Aurora's fingers stilled. "The summoning that trapped you." "Not trapped. Transformed." Nyx extended their hand toward the stone, and shadows rippled across their arm like ink in water. "I came seeking something. Some answer that I thought existed beyond the Veil. Instead, I became a bridge between worlds. A living rupture." The casual way they spoke of their own tragedy made Aurora ache. Four hundred years trapped between existence and non-existence, and still they could describe it with such calm. She
was beginning
to
understand that Nyx's
serenity wasn't acceptance—it was survival. The alternative would have been dissolution. "The Veil weakens during the winter solstice," Isolde said, moving deeper into the grove. "It weakens at the places where it was first woven, where the fabric is oldest and most delicate. This grove is one such place. The stone Nyx recognizes was erected during the last Sundering, when the realms were being separated. It remembers the time before division." They emerged into a section of the grove where the wildflowers gave way to a small pool of water so clear that Aurora could see every pebble on its bottom. The surface was
utterly
still, a perfect mirror of the impossible sky above. She knelt at its edge and saw her own face reflected back at her—but for just a moment, she also saw something else. A glimpse of another sky, amber-colored and vast, with a sun that didn't quite look like Earth's sun. She jerked back, gasping. "The Veil is thinnest at still waters," Isolde said. Her voice was gentle now, almost sympathetic. "The boundary between worlds becomes transparent. You can see through to Dymas from here, if you know how to look." Dymas. The realm of Gluttony. Where the Heartstone pendant in Aurora's pocket came from, given to her by some unknown benefactor who
seemed to
know an awful lot about her future. The pendant pulsed faintly, responding to proximity with the Hel realm visible in the water's reflection. "How long do we have?" Aurora asked, standing. "Before the solstice ends?" "Time moves strangely here," Isolde said. "An hour in the grove might be minutes in your world, or days. The more attention you pay to duration, the more unreliable it becomes. It is better not to think of time at all." Nyx had come to stand beside the pool, their shadowed form bending to examine their own reflection. For a moment, Aurora saw it—the shape of what they must have been before the summoning. A man's silhouette, broad-shouldered and tall. Then the image shifted,
fractured
, and Nyx was shadow again. "The blade responds to this place," Nyx observed, pointing to the Fae-forged dagger at Aurora's hip. The moonsilver was luminescent now, glowing faintly despite the daylight. "It knows its home is near." Aurora drew the dagger and held it up to the strange light. The blade
seemed to
absorb the clarity around them and glow brighter in response, as though awakening. "What have you brought us to, Isolde?" Aurora asked. "What does this place want from us?" The Seer smiled, and there was something knowing in it, something that suggested she'd been waiting for exactly this question. "Not want," Isolde said
softly
. "Offer. The grove offers knowledge, if you're brave enough to take it. But knowledge, in such places, always has a price."
created_at
"2026-02-17T02:44:53.650426+00:00"
2/17/2026, 2:44:53 AM
model
"anthropic/claude-4.5-haiku-20251001"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
399
moderation_latency
(null)
generation_time
23359
tokens_prompt
1590
tokens_completion
2121
native_tokens_prompt
1757
native_tokens_completion
1953
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
0.011522
router
(null)
provider_responses
0
id
"msg_019krrz2nxJasa4gVujbJFwr"
status
200
is_byok
false
latency
397
endpoint_id
"41d2915a-92e6-4993-b537-210b4e10cba8"
provider_name
"Anthropic"
model_permaslug
"anthropic/claude-4.5-haiku-20251001"
api_type
"completions"
id
"gen-1771296269-euUImfZi513j61IepXOM"
upstream_id
"msg_019krrz2nxJasa4gVujbJFwr"
total_cost
0.011522
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Anthropic"
Evaluation details
Result
Evaluator
Details
Meta Data
70.8333%
Adverbs in dialogue tags
Target: ≤10% dialogue tags with adverbs
totalTags
16
adverbTagCount
3
adverbTags
0
"Isolde said, already three steps ahead of them [already]"
1
"Nyx said quietly [quietly]"
2
"Isolde said softly [softly]"
56.3001%
AI-ism adverb frequency
Target: <1% AI-ism adverbs (57 tracked)
wordCount
1373
totalAiIsmAdverbs
6
found
0
adverb
"quickly"
count
1
1
adverb
"sharply"
count
1
2
adverb
"slightly"
count
1
3
adverb
"softly"
count
1
4
adverb
"utterly"
count
1
5
adverb
"truly"
count
1
highlights
0
"quickly"
1
"sharply"
2
"slightly"
3
"softly"
4
"utterly"
5
"truly"
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)
63.5834%
AI-ism word frequency
Target: <1% AI-ism words (140 tracked)
wordCount
1373
totalAiIsms
5
found
0
word
"crystalline"
count
1
1
word
"flickered"
count
2
2
word
"glided"
count
1
3
word
"fractured"
count
1
highlights
0
"crystalline"
1
"flickered"
2
"glided"
3
"fractured"
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
81
matches
(empty)
100.0000%
Filter word density
Target: ≤12% sentences with filter/hedge words
filterCount
0
hedgeCount
4
narrationSentences
81
filterMatches
(empty)
hedgeMatches
0
"began to"
1
"seemed to"
100.0000%
Overuse of "that" (subordinate clause padding)
Target: ≤10% sentences with "that" clauses
thatCount
1
totalSentences
99
matches
0
"understand that Nyx's"
100.0000%
Paragraph length variance
Target: CV ≥0.5 for paragraph word counts
totalParagraphs
37
mean
36.59
std
20.77
cv
0.567
sampleLengths
0
9
1
85
2
46
3
4
4
47
5
33
6
70
7
30
8
43
9
42
10
43
11
16
12
26
13
12
14
42
15
60
16
4
17
38
18
57
19
34
20
59
21
8
22
43
23
47
24
60
25
84
26
4
27
36
28
47
29
12
30
41
31
49
32
32
33
29
34
16
35
20
36
26
100.0000%
Passive voice overuse
Target: ≤5% passive sentences
passiveCount
1
totalSentences
81
matches
0
"were worked"
100.0000%
Past progressive (was/were + -ing) overuse
Target: ≤10% past progressive verbs
pastProgressiveCount
2
totalVerbs
175
matches
0
"was learning"
1
"was beginning"
100.0000%
Purple prose (modifier overload)
Target: <4% adverbs, <2% -ly adverbs, no adj stacking
wordCount
1022
adjectiveStacks
0
stackExamples
(empty)
adverbCount
40
adverbRatio
0.03913894324853229
lyAdverbCount
13
lyAdverbRatio
0.012720156555772993
100.0000%
Repeated phrase echo
Target: ≤20% sentences with echoes (window: 2)
totalSentences
99
echoCount
0
echoWords
(empty)
100.0000%
Sentence length variance
Target: CV ≥0.4 for sentence word counts
totalSentences
99
mean
13.68
std
8.5
cv
0.621
sampleLengths
0
9
1
17
2
17
3
12
4
3
5
36
6
5
7
15
8
26
9
4
10
12
11
19
12
13
13
3
14
11
15
11
16
11
17
8
18
28
19
15
20
19
21
21
22
3
23
6
24
10
25
17
26
16
27
15
28
22
29
5
30
19
31
24
32
8
33
8
34
11
35
13
36
2
37
4
38
8
39
21
40
21
41
14
42
16
43
11
44
6
45
13
46
4
47
5
48
15
49
18
49.8316%
Sentence opener variety
Target: ≥60% unique sentence openers
consecutiveRepeats
9
diversityRatio
0.35353535353535354
totalSentences
99
uniqueOpeners
35
65.6250%
Dialogue tag variety (said vs. fancy)
Target: ≤30% fancy dialogue tags
totalTags
16
fancyCount
7
fancyTags
0
"Aurora whispered (whisper)"
1
"Isolde corrected (correct)"
2
"Aurora breathed (breathe)"
3
"Nyx said quietly (say quietly)"
4
"Isolde said, moving deeper into the grove (say, move)"
5
"Nyx observed, pointing to the Fae-forged dagger at Aurora's hip (observe, point)"
6
"Isolde said softly (say softly)"
88.5984%