NC Bench
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Run: 2026-02-20-01KHYB7HDVTS7HD8T2PX35MN6B
Run Details
Model:
Grok 4.1 Fast
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
13.4s
Cost:
$0.001069
Provider:
xAI
Evaluation summary
Score
Evaluator
Details Link
100.00%
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
Torrential rain pounded the grimy windows of Blackwood Manor relentlessly. Inside the study, wealthy Lord Harrington lay slumped over dead. Earlier that evening, a single gunshot echoed through empty corridors. Terrified guests from the lavish dinner party scattered in panic. Detective Inspector Graves arrived swiftly at the chaotic crime scene. Crimson blood pooled beneath the victim's pale head on rug. The loyal butler's ornate silver tray lay overturned nearby suspiciously. Who among the five suspects wielded the fatal murder weapon?
created_at
"2026-02-20T20:18:02.31Z"
2/20/2026, 8:18:02 PM
model
"x-ai/grok-4.1-fast"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
206
moderation_latency
(null)
generation_time
13255
tokens_prompt
46
tokens_completion
393
native_tokens_prompt
191
native_tokens_completion
2106
native_tokens_completion_images
0
native_tokens_reasoning
1999
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
0.00106855
router
(null)
provider_responses
0
endpoint_id
"9821aa0e-dce3-4c27-9716-161359123d0b"
id
"82377841-c47f-58df-8d16-f9ae50dcdb88"
is_byok
false
latency
25
model_permaslug
"x-ai/grok-4.1-fast"
provider_name
"xAI"
status
200
api_type
"completions"
id
"gen-1771618682-bWQ71XPCouJ5TJrWnZiS"
upstream_id
"82377841-c47f-58df-8d16-f9ae50dcdb88"
total_cost
0.00106855
cache_discount
0.00002265
upstream_inference_cost
0
provider_name
"xAI"
Evaluation details
Result
Evaluator
Details
Meta Data
100.00%
Matches word count
n/a
neededClean
false
sentences
8
wordCounts
0
10
1
10
2
10
3
10
4
10
5
10
6
10
7
10