NC Bench
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Run: 2026-02-16-01KHKAYAZEMBXFYN5QKW9KHMHT
Run Details
Model:
GPT-5 Mini
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
25.2s
Cost:
$0.004548
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
Fog crawled through the avenue, swallowing lamplight and whispered steps. A silhouette stood beneath the museum's rotten clock, hands trembling. Blood smeared the marble vestibule, dark flowers on cold floor. Detectives arrived with umbrellas, collars up, faces unreadable and alert. Neighbors watched from curtained windows, gossiping like nervous birds outside. A single shoe lay near the victim, scuffed and empty. Rain tapped secrets against the ancient foyer's stained-glass windows slowly. The coroner arrived, pocket watch clicking, eyes cataloguing small truths. A note tucked beneath a candlestick read only one word. The word was betrayed, ink blotched, trembling as if confessing. Footsteps retreated into rain; someone laughed, embarrassingly human and hollow. The mayor's wife later denied involvement with steady practiced grief. Everyone carried secrets like stones, ready to sink the innocent.
created_at
"2026-02-16T13:41:47.983632+00:00"
2/16/2026, 1:41:47 PM
model
"openai/gpt-5-mini-2025-08-07"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
8654
moderation_latency
(null)
generation_time
24981
tokens_prompt
46
tokens_completion
925
native_tokens_prompt
41
native_tokens_completion
2269
native_tokens_completion_images
0
native_tokens_reasoning
2048
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
0.00454825
router
(null)
provider_responses
0
id
"resp_0de2c53bc075b8530169931e821ac081949239d05f1a20478d"
status
200
is_byok
false
latency
125
endpoint_id
"c4f66d01-20b0-4c27-a225-438ea22fda43"
provider_name
"OpenAI"
model_permaslug
"openai/gpt-5-mini-2025-08-07"
api_type
"completions"
id
"gen-1771249282-aECRNEyzdylyt7aWRFpF"
upstream_id
"resp_0de2c53bc075b8530169931e821ac081949239d05f1a20478d"
total_cost
0.00454825
cache_discount
(null)
upstream_inference_cost
0
provider_name
"OpenAI"
Evaluation details
Result
Evaluator
Details
Meta Data
98.0063%
Matches word count
n/a
neededClean
false
sentences
13
wordCounts
0
10
1
10
2
10
3
10
4
10
5
10
6
11
7
10
8
10
9
10
10
10
11
10
12
10