NC Bench
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Run: 2026-02-16-01KHK9W84AE90N07S8TN4WFASA
Run Details
Model:
GPT-5 Mini
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
38.0s
Cost:
$0.006202
Provider:
OpenAI
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
The rain had hollowed the cobblestones and the gaslight shivered as the gardener found Mrs. Penhaligon's body near the gate. By dawn, a ragged crowd gathered like crows around the iron railings, whispering theories and holding umbrellas and muttered accusations. Inspector Grey arrived with mud on his shoes and a notebook already open to names he would cross later silently. Her gloves were folded on the grass as if waiting for hands that would never return from market or errands. A smear of perfume clung to the collar, lemon and jasmine, as if someone had lingered and lied quite deliberately. Inside the drawing room a clock continued to tick, indifferent, and the silver tea set trembled with fingerprints that morning. Grey's eyes found a scrap of paper pinned beneath a book, a child's drawing twisted around the initials and date. Outside, someone laughed sharply and somewhere a carriage rattled; tonight secrets would have sharp teeth and blood if truth came.
created_at
"2026-02-16T13:23:23.304671+00:00"
2/16/2026, 1:23:23 PM
model
"openai/gpt-5-mini-2025-08-07"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
2049
moderation_latency
(null)
generation_time
37612
tokens_prompt
46
tokens_completion
1124
native_tokens_prompt
41
native_tokens_completion
3096
native_tokens_completion_images
0
native_tokens_reasoning
2880
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
0.00620225
router
(null)
provider_responses
0
id
"resp_0ced68225fdc5f2f0169931a251c648195b3a654abc69245b7"
status
200
is_byok
false
latency
150
endpoint_id
"c4f66d01-20b0-4c27-a225-438ea22fda43"
provider_name
"OpenAI"
model_permaslug
"openai/gpt-5-mini-2025-08-07"
api_type
"completions"
id
"gen-1771248165-i2uxu1hITBjQmLLYMzKe"
upstream_id
"resp_0ced68225fdc5f2f0169931a251c648195b3a654abc69245b7"
total_cost
0.00620225
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
8
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
20
7
20