NC Bench
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Run: 2026-02-20-01KHY874PH8Z9YKZ5N0YYZPZTV
Run Details
Model:
Grok 4.1 Fast
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
11.2s
Cost:
$0.000548
Provider:
xAI
Evaluation summary
Score
Evaluator
Details Link
97.12%
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
Rain pounded the windows of the darkened Victorian mansion relentlessly. Guests gathered around the fireplace seeking warmth and idle chatter. Sir Reginald hosted his annual party with elegant pomp and style. Suddenly, a piercing scream echoed through the grand hallway nearby. Panicked guests rushed toward the source of that bloodcurdling cry. They discovered Lady Eleanor's body sprawled lifeless on library floor. A bloodied dagger lay beside her pale and motionless form. Inspector Graves arrived swiftly after the frantic emergency call came. He surveyed the gruesome scene with sharp and practiced eyes.
created_at
"2026-02-20T19:25:23.549Z"
2/20/2026, 7:25:23 PM
model
"x-ai/grok-4.1-fast"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
684
moderation_latency
(null)
generation_time
11132
tokens_prompt
46
tokens_completion
277
native_tokens_prompt
191
native_tokens_completion
1065
native_tokens_completion_images
0
native_tokens_reasoning
949
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
0.00054805
router
(null)
provider_responses
0
endpoint_id
"9821aa0e-dce3-4c27-9716-161359123d0b"
id
"0cb04de0-20e0-1a44-1a66-3c07a554bdc5"
is_byok
false
latency
443
model_permaslug
"x-ai/grok-4.1-fast"
provider_name
"xAI"
status
200
api_type
"completions"
id
"gen-1771615523-Rz1lyYSzM9eDjhOU9d2m"
upstream_id
"0cb04de0-20e0-1a44-1a66-3c07a554bdc5"
total_cost
0.00054805
cache_discount
0.00002265
upstream_inference_cost
0
provider_name
"xAI"
Evaluation details
Result
Evaluator
Details
Meta Data
97.12%
Matches word count
n/a
neededClean
false
sentences
9
wordCounts
0
10
1
10
2
11
3
10
4
10
5
10
6
10
7
10
8
10