NC Bench
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Run: 2026-02-20-01KHY9KFGGJ5XZWB89PQKFD9WM
Run Details
Model:
Grok 4
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
14.4s
Cost:
$0.006122
Provider:
xAI
Evaluation summary
Score
Evaluator
Details Link
80.33%
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 mansion loomed ominously on the hill, its ancient windows staring like unblinking eyes into the stormy night ahead. Detective Eliza Thorne arrived at midnight, her trench coat dripping rain as she stepped over the creaking threshold into darkness. Inside, the air hung heavy with secrets, and a faint metallic scent hinted at violence lurking in the shadows. She followed the butler down a dimly lit hallway, where portraits of stern ancestors seemed to watch her every move closely. Suddenly, a piercing scream echoed from the study, shattering the silence and sending chills racing down her spine immediately. Rushing forward, Eliza burst through the door to find Lord Harrington slumped lifeless in his leather armchair by the fire. Blood pooled on the antique rug beneath him, staining the intricate patterns with a gruesome, irreversible mark of foul play. A cryptic note clutched in his cold hand read mysterious words that promised to unravel a web of deceit soon. Eliza knelt to examine the scene, her keen eyes spotting a misplaced dagger glinting under the flickering candlelight nearby. As thunder roared outside, she knew this murder would test her skills against a clever killer hiding in plain sight.
created_at
"2026-02-20T19:49:36.412Z"
2/20/2026, 7:49:36 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
5175
moderation_latency
(null)
generation_time
14256
tokens_prompt
46
tokens_completion
308
native_tokens_prompt
719
native_tokens_completion
372
native_tokens_completion_images
0
native_tokens_reasoning
141
native_tokens_cached
718
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
0.0061215
router
(null)
provider_responses
0
endpoint_id
"d40bef9d-6936-4c57-9749-bf7399de4a77"
id
"670a8457-5aed-9e31-6a81-d7521dd44035"
is_byok
false
latency
81
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-1771616976-jcWnXJeQF5qjBMRkNxNb"
upstream_id
"670a8457-5aed-9e31-6a81-d7521dd44035"
total_cost
0.0061215
cache_discount
0.0016155
upstream_inference_cost
0
provider_name
"xAI"
Evaluation details
Result
Evaluator
Details
Meta Data
80.33%
Matches word count
n/a
neededClean
false
sentences
10
wordCounts
0
21
1
20
2
19
3
21
4
19
5
20
6
20
7
20
8
19
9
20