NC Bench
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Run: 2026-02-16-01KHKB2TX9PMBYBRMWG1XK46VZ
Run Details
Model:
GPT-5 Mini
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
38.0s
Cost:
$0.004666
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
Night fog swallowed the manor's stone steps and iron gate. A single lamp guttered, casting long fingers across the hall. Detective Mallory stepped inside, shoes whispering on polished oak panels. Blood had dried like a dark roadmap toward the fireplace. A shattered vase marked the beginning of the night's violence. Portraits on the staircase watched with varnished indifference and accusation. Someone had washed the kitchen floor but missed one smear. The victim's watch lay stopped at exactly two minutes past. Neighbors whispered behind curtains; secrets pooled like water in drains. Mallory checked pockets and found lint, ticket, and crumpled receipt. Outside, rain began tapping like impatient fingers on the glass. A neighbor's dog howled once, then fell silent, listening intently. There was mud tracked across the hallway, small and erratic. In the study, an open ledger listed names and numbers. Mallory noticed a page turned down beside Mrs. Pembroke's signature.
created_at
"2026-02-16T13:44:27.928094+00:00"
2/16/2026, 1:44:27 PM
model
"openai/gpt-5-mini-2025-08-07"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
22330
moderation_latency
(null)
generation_time
37369
tokens_prompt
46
tokens_completion
899
native_tokens_prompt
41
native_tokens_completion
2328
native_tokens_completion_images
0
native_tokens_reasoning
2112
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
0.00466625
router
(null)
provider_responses
0
id
"resp_09deaf81f4a3e54c0169931f1583248195a59874e9a96df607"
status
200
is_byok
false
latency
192
endpoint_id
"c4f66d01-20b0-4c27-a225-438ea22fda43"
provider_name
"OpenAI"
model_permaslug
"openai/gpt-5-mini-2025-08-07"
api_type
"completions"
id
"gen-1771249429-Cscp3rmSyXyZV8uLknBc"
upstream_id
"resp_09deaf81f4a3e54c0169931f1583248195a59874e9a96df607"
total_cost
0.00466625
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
15
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
14
10