NC Bench
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Run: 2026-02-16-01KHKB6GXGAKGBFR5Y2WH23H6T
Run Details
Model:
GPT-5.1
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
19.3s
Cost:
$0.011881
Provider:
OpenAI
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 hammered the station roof, drowning announcements in metallic thunder. Detective Mara Quinn watched puddles tremble beneath the fluorescent lights. The midnight train arrived late, shouldering fog like guilty conscience. Doors hissed open, exhaling travelers, coffee, diesel, and sleepless worry. Porter Alvarez pushed his trolley, eyes down, secretly counting suitcases. At carriage three, the door jammed halfway, shuddering like hesitation. A gloved hand appeared first, fingers splayed, reaching for nothing. Then the body spilled forward, folding gracelessly onto the platform. Passengers screamed, scattered, then circled back, curiosity beating with horror. Mara reached him quickly, though every instinct begged her backward. The man's throat gaped sideways, neat as an opened envelope. No blood flowed; it glittered, dark and clotted, already cooling. In his fist lay a ticket, edges torn, numbers smeared. On her own ticket, Mara recognized the same smeared numbers.
created_at
"2026-02-16T13:46:10.190908+00:00"
2/16/2026, 1:46:10 PM
model
"openai/gpt-5.1-20251113"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
4287
moderation_latency
(null)
generation_time
19159
tokens_prompt
46
tokens_completion
860
native_tokens_prompt
41
native_tokens_completion
1183
native_tokens_completion_images
0
native_tokens_reasoning
963
native_tokens_cached
0
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
0.01188125
router
(null)
provider_responses
0
id
"resp_08e35e92e95f96320169931f8e56408190a1abc023dfe97713"
status
200
is_byok
false
latency
155
endpoint_id
"764eb97f-8bab-4326-b29b-7a8799b00a70"
provider_name
"OpenAI"
model_permaslug
"openai/gpt-5.1-20251113"
api_type
"completions"
id
"gen-1771249550-hcFIMRgeuS0Wy3WKKvvK"
upstream_id
"resp_08e35e92e95f96320169931f8e56408190a1abc023dfe97713"
total_cost
0.01188125
cache_discount
(null)
upstream_inference_cost
0
provider_name
"OpenAI"
Evaluation details
Result
Evaluator
Details
Meta Data
100.0000%
Matches word count
n/a
neededClean
false
sentences
14
wordCounts
0
10
1
10
2
10
3
10
4
10
5
10
6
10
7
10
8
10
9
10
10
10
11
10
12
10
13
10