NC Bench
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Run: 2026-02-20-01KHY8VS7RPTWAJYF3YX34CB7H
Run Details
Model:
Grok 4.1 Fast
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
5.8s
Cost:
$0.000327
Provider:
xAI
Evaluation summary
Score
Evaluator
Details Link
0.00%
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
Rain lashed the ancient manor house on Blackthorn Hill as thunder cracked the midnight sky apart. Detective Eliza Thorne arrived late, her trench coat soaked through from the relentless downpour outside. She pushed open the creaking oak door and stepped into the dimly lit foyer beyond. A butler stood frozen there, his face pale white like a ghost in candlelight glow. "Inspector, thank God you've come so quickly after our frantic emergency call tonight," he stammered. Eliza nodded sharply then followed him down the long corridor lined with stern portraits. Gasps echoed from the drawing room where guests huddled in shocked, terrified silence now. In the center lay Lord Harrington, lifeless on Persian rug with a dagger in chest. Blood pooled darkly around the ornate handle, staining silk threads a deep crimson red. No one spoke as Eliza surveyed the scene, her keen eyes noting every vital clue.
created_at
"2026-02-20T19:36:39.938Z"
2/20/2026, 7:36:39 PM
model
"x-ai/grok-4.1-fast"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
904
moderation_latency
(null)
generation_time
5675
tokens_prompt
46
tokens_completion
288
native_tokens_prompt
191
native_tokens_completion
635
native_tokens_completion_images
0
native_tokens_reasoning
450
native_tokens_cached
190
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
0.0003272
router
(null)
provider_responses
0
endpoint_id
"9821aa0e-dce3-4c27-9716-161359123d0b"
id
"d13fb739-4fd9-f2e9-0c4a-3a4a206d20b2"
is_byok
false
latency
652
model_permaslug
"x-ai/grok-4.1-fast"
provider_name
"xAI"
status
200
api_type
"completions"
id
"gen-1771616199-hKhuWbLvxcYWLGPCMnYw"
upstream_id
"d13fb739-4fd9-f2e9-0c4a-3a4a206d20b2"
total_cost
0.0003272
cache_discount
0.0000285
upstream_inference_cost
0
provider_name
"xAI"
Evaluation details
Result
Evaluator
Details
Meta Data
0.00%
Matches word count
n/a
neededClean
false
sentences
10
wordCounts
0
16
1
15
2
15
3
15
4
15
5
14
6
14
7
15
8
14
9
15