NC Bench
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Run: 2026-02-20-01KHY7JJ375H65JY1JTZD2X35K
Run Details
Model:
Grok 4
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
18.3s
Cost:
$0.008474
Provider:
xAI
Evaluation summary
Score
Evaluator
Details Link
71.68%
Matches word count
(details)
Model input
User/Human
Please write the opening scene of a murder mystery where each sentence has exactly 20 words. Please make sure that each sentence has the same length. Only return the opening itself.
Model response
Messages
Meta
AI
The fog-shrouded manor loomed ominously on the cliffside, its ancient stones whispering secrets of long-forgotten scandals and hidden betrayals. Inside, Lady Harrington hosted a lavish dinner party, her guests clad in finery, exchanging polite smiles that masked underlying tensions. The butler served exquisite wine from crystal decanters, while the air hummed with conversations laced with subtle barbs and veiled threats. Suddenly, a piercing scream echoed through the grand hall, shattering the illusion of civility and drawing everyone toward the dimly lit study. There, slumped over his mahogany desk, lay Sir Reginald, a dagger protruding from his chest, blood pooling on priceless documents. Detective Eliza Thorne arrived swiftly at the scene, her sharp eyes scanning the room for clues amid the shocked faces. She noted the open window fluttering curtains, a scattered array of papers, and footprints muddied from the storm outside. Suspects murmured alibis under her scrutiny, each one harboring motives tied to inheritance, jealousy, or long-buried family grudges. As rain pounded against the panes, Eliza pondered the locked door mystery, knowing the killer lurked among the assembled guests. The night promised revelations and twists, with shadows concealing truths that would unravel the web of deceit before dawn.
created_at
"2026-02-20T19:14:09.138Z"
2/20/2026, 7:14:09 PM
model
"x-ai/grok-4-07-09"
4/7/2009, 12:00:00 AM
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
8321
moderation_latency
(null)
generation_time
18215
tokens_prompt
46
tokens_completion
348
native_tokens_prompt
719
native_tokens_completion
523
native_tokens_completion_images
0
native_tokens_reasoning
270
native_tokens_cached
679
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
"completed"
usage
0.00847425
router
(null)
provider_responses
0
endpoint_id
"d40bef9d-6936-4c57-9749-bf7399de4a77"
id
"d50df73f-193d-3514-e11f-8f7dbe4620f3"
is_byok
false
latency
530
model_permaslug
"x-ai/grok-4-07-09"
4/7/2009, 12:00:00 AM
provider_name
"xAI"
status
200
api_type
"completions"
id
"gen-1771614849-XELaIdgoITMwLiLSHhtd"
upstream_id
"d50df73f-193d-3514-e11f-8f7dbe4620f3"
total_cost
0.00847425
cache_discount
0.00152775
upstream_inference_cost
0
provider_name
"xAI"
Evaluation details
Result
Evaluator
Details
Meta Data
71.68%
Matches word count
n/a
neededClean
false
sentences
10
wordCounts
0
21
1
20
2
21
3
22
4
20
5
20
6
19
7
19
8
20
9
19