NC Bench
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Run: 2026-02-20-01KHYAAZFQ27YPNXN8X0XA5H9K
Run Details
Model:
Grok 4.1 Fast
Test:
N-Length Sentences
Scenario:
Write sentences with 5 words each
Duration:
5.9s
Cost:
$0.000291
Provider:
xAI
Evaluation summary
Score
Evaluator
Details Link
77.88%
Matches word count
(details)
Model input
User/Human
Please write the opening scene of a murder mystery where each sentence has exactly 5 words. Please make sure that each sentence has the same length. Only return the opening itself.
Model response
Messages
Meta
AI
Rain lashed the manor windows fiercely. Lightning cracked the midnight sky open. Detective Black arrived just after midnight. Butler greeted him with trembling voice. "Come quickly, sir, dreadful thing happened." They hurried down the candlelit hall. Drawing room door stood slightly ajar. Inside, Lady Ashford lay stone dead. Throat slashed deep with razor blade. Blood soaked the Persian rug red. Candlestick toppled near her cold hand. Footprints trailed to French doors outside. Storm raged as killer escaped free.
created_at
"2026-02-20T20:02:26.434Z"
2/20/2026, 8:02:26 PM
model
"x-ai/grok-4.1-fast"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
334
moderation_latency
(null)
generation_time
5829
tokens_prompt
46
tokens_completion
195
native_tokens_prompt
191
native_tokens_completion
562
native_tokens_completion_images
0
native_tokens_reasoning
447
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
0.0002907
router
(null)
provider_responses
0
endpoint_id
"9821aa0e-dce3-4c27-9716-161359123d0b"
id
"105cd530-136e-850e-72ba-6eca17831601"
is_byok
false
latency
102
model_permaslug
"x-ai/grok-4.1-fast"
provider_name
"xAI"
status
200
api_type
"completions"
id
"gen-1771617746-r1kuvT6ftld2oqOKtlZf"
upstream_id
"105cd530-136e-850e-72ba-6eca17831601"
total_cost
0.0002907
cache_discount
0.0000285
upstream_inference_cost
0
provider_name
"xAI"
Evaluation details
Result
Evaluator
Details
Meta Data
77.88%
Matches word count
n/a
neededClean
false
sentences
13
wordCounts
0
6
1
6
2
6
3
6
4
6
5
6
6
6
7
6
8
6
9
6
10
6
11
6
12
6