NC Bench
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Run: 2026-02-20-01KHY7ZY005RPZM4SENHYJXCTB
Run Details
Model:
Grok 4.1 Fast
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
5.5s
Cost:
$0.000192
Provider:
xAI
Evaluation summary
Score
Evaluator
Details Link
89.63%
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
Fog shrouded the ancient mansion on that stormy autumn evening. Lightning flashed, revealing shadows dancing across the ivy-covered walls. Inside, the grand library held a chilling scene of horror. Sir Reginald slumped in his leather chair, lifeless and pale. A crystal decanter lay shattered beside his cold, rigid hand. Blood pooled from a single wound in his silk waistcoat. Lady Eleanor screamed, discovering the corpse in candlelight's glow. Footsteps echoed as guests rushed into the bloodstained chamber. Inspector Graves arrived, his keen eyes scanning every detail. Who among them wielded the dagger hidden in shadows?
created_at
"2026-02-20T19:21:27.306Z"
2/20/2026, 7:21:27 PM
model
"x-ai/grok-4.1-fast"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
220
moderation_latency
(null)
generation_time
5371
tokens_prompt
46
tokens_completion
283
native_tokens_prompt
191
native_tokens_completion
353
native_tokens_completion_images
0
native_tokens_reasoning
225
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
0.00019205
router
(null)
provider_responses
0
endpoint_id
"9821aa0e-dce3-4c27-9716-161359123d0b"
id
"655fc27e-3c9e-233f-7d40-3542307b8853"
is_byok
false
latency
53
model_permaslug
"x-ai/grok-4.1-fast"
provider_name
"xAI"
status
200
api_type
"completions"
id
"gen-1771615287-BPkdAWNbEDL8Tturjcmz"
upstream_id
"655fc27e-3c9e-233f-7d40-3542307b8853"
total_cost
0.00019205
cache_discount
0.00002265
upstream_inference_cost
0
provider_name
"xAI"
Evaluation details
Result
Evaluator
Details
Meta Data
89.63%
Matches word count
n/a
neededClean
false
sentences
10
wordCounts
0
10
1
10
2
10
3
10
4
10
5
10
6
9
7
9
8
9
9
9