NC Bench
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Run: 2026-02-16-01KHK9D27KAMPYHYTRMCBKY6GP
Run Details
Model:
GPT-5 Mini
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
13.3s
Cost:
$0.002856
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 stitched the city into a coat of watery light. A scream unfurled near the harbor, then silence swallowed everything. Officer Marron found the body beneath a lamplight's jaundiced glow. Blood mapped a slow, ritual curve across the cobbles, gleaming. A pocketwatch lay open, its hands frozen at exactly midnight. Neighbors gathered like moths, whispering alibis and fabricated truths nervously. Detective Liao arrived, trench coat damp, eyes sharp and tired. She knelt, noting footprints, cigarette ash, and a monogrammed handkerchief. Moonlight outlined the docks like a blade against the black. Someone had called it an accident; she called it murder. The town clock chimed once, a witness with small teeth. She rose, pockets heavy with questions and damp cigarette smoke.
created_at
"2026-02-16T13:14:41.197602+00:00"
2/16/2026, 1:14:41 PM
model
"openai/gpt-5-mini-2025-08-07"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
11356
moderation_latency
(null)
generation_time
13074
tokens_prompt
46
tokens_completion
320
native_tokens_prompt
41
native_tokens_completion
1423
native_tokens_completion_images
0
native_tokens_reasoning
1216
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
0.00285625
router
(null)
provider_responses
0
id
"resp_023585353a2aa67d01699318338ce48190ab30c3dc8989c39c"
status
200
is_byok
false
latency
127
endpoint_id
"c4f66d01-20b0-4c27-a225-438ea22fda43"
provider_name
"OpenAI"
model_permaslug
"openai/gpt-5-mini-2025-08-07"
api_type
"completions"
id
"gen-1771247667-kZKdjlmegu6DCiDRmazh"
upstream_id
"resp_023585353a2aa67d01699318338ce48190ab30c3dc8989c39c"
total_cost
0.00285625
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
12
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