NC Bench
Overview
About
Tests
Models
Vendors
Run: 2026-02-20-01KHY9CSN6C0M3Z0GN3Z7VTBW9
Run Details
Model:
Grok 4
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
26.3s
Cost:
$0.012670
Provider:
xAI
Evaluation summary
Score
Evaluator
Details Link
64.16%
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 hilltop, its ancient stone walls whispering secrets from a bygone era of intrigue. Inside, Lord Archibald Blackwell gathered his eccentric guests for what promised to be an unforgettable evening of fine dining and revelations. Candlelight flickered across polished silverware and crystal glasses, casting long shadows that danced like specters on the ornate wallpaper. Lady Eliza, resplendent in emerald silk, smiled graciously at the assembled company, hiding her own web of hidden motives and resentments. Suddenly, a piercing scream echoed through the grand dining hall, shattering the fragile veneer of civility among the startled diners. Rushing to the source, they discovered the butler's lifeless body slumped in the dimly lit pantry, a dagger protruding from his chest. Blood pooled on the cold marble floor, staining the scene with accusations, as whispers of foul play rippled through the group. Detective Harlan Crowe arrived swiftly at the chaotic manor, his keen eyes scanning for clues amid the growing atmosphere of suspicion. Each guest harbored a potential alibi or motive, turning the opulent estate into a labyrinth of deception and deadly secrets.
created_at
"2026-02-20T19:45:57.427Z"
2/20/2026, 7:45:57 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
16312
moderation_latency
(null)
generation_time
26225
tokens_prompt
46
tokens_completion
318
native_tokens_prompt
719
native_tokens_completion
805
native_tokens_completion_images
0
native_tokens_reasoning
576
native_tokens_cached
694
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
0.0126705
router
(null)
provider_responses
0
endpoint_id
"d40bef9d-6936-4c57-9749-bf7399de4a77"
id
"d7daace2-2755-57d6-0d56-c35aca4954a3"
is_byok
false
latency
89
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-1771616757-izMPYAJwSb1CR6Gr9AYO"
upstream_id
"d7daace2-2755-57d6-0d56-c35aca4954a3"
total_cost
0.0126705
cache_discount
0.0015615
upstream_inference_cost
0
provider_name
"xAI"
Evaluation details
Result
Evaluator
Details
Meta Data
64.16%
Matches word count
n/a
neededClean
false
sentences
9
wordCounts
0
21
1
21
2
19
3
21
4
20
5
22
6
21
7
21
8
20