NC Bench
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Run: 2026-02-20-01KHY8DTCV1RTA1RM15SZTHPXG
Run Details
Model:
Grok 4 Fast
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
4.0s
Cost:
$0.000226
Provider:
xAI
Evaluation summary
Score
Evaluator
Details Link
47.70%
Matches word count
(details)
Model input
User/Human
Please write the opening scene of a murder mystery where each sentence has exactly 10 words. Please make sure that each sentence has the same length. Only return the opening itself.
Model response
Messages
Meta
AI
The clock struck midnight in the quiet village square. Fog rolled thickly down from the ancient, looming hills. A scream shattered silence, piercing the cold night air. Villagers rushed out, lanterns flickering in trembling hands. They found her body sprawled on cobblestone path. Blood pooled dark beneath her pale, lifeless face. Constable hurried over, his boots splashing through puddles. "Who discovered this horror in our peaceful town?" The baker pointed, his voice choked with sudden fear. Murder had come, and whispers spread like wildfire.
created_at
"2026-02-20T19:29:02.375Z"
2/20/2026, 7:29:02 PM
model
"x-ai/grok-4-fast"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
2936
moderation_latency
(null)
generation_time
3844
tokens_prompt
46
tokens_completion
149
native_tokens_prompt
191
native_tokens_completion
421
native_tokens_completion_images
0
native_tokens_reasoning
304
native_tokens_cached
151
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
0.00022605
router
(null)
provider_responses
0
endpoint_id
"c9586d9d-97ff-40ca-ae94-22504d6f9b7e"
id
"1200fc9e-e831-20f6-5a14-33de4a65f8b7"
is_byok
false
latency
746
model_permaslug
"x-ai/grok-4-fast"
provider_name
"xAI"
status
200
api_type
"completions"
id
"gen-1771615742-wYTo4KlxFtMs03DEJF96"
upstream_id
"1200fc9e-e831-20f6-5a14-33de4a65f8b7"
total_cost
0.00022605
cache_discount
0.00002265
upstream_inference_cost
0
provider_name
"xAI"
Evaluation details
Result
Evaluator
Details
Meta Data
47.70%
Matches word count
n/a
neededClean
false
sentences
10
wordCounts
0
9
1
9
2
9
3
8
4
8
5
8
6
8
7
8
8
9
9
8