NC Bench
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Run: 2026-02-16-01KHKA4WSBBTESRH4AYZ2NEZQF
Run Details
Model:
GPT-5 Mini
Test:
N-Length Sentences
Scenario:
Write sentences with 10 words each
Duration:
21.6s
Cost:
$0.004120
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 town's lamps with a dull metallic light. Detective Marlowe arrived, coat collar up against biting wind's teeth. A yellow tape hummed like nervous string across the lane. Body lay under the sycamore, face hidden by crimson scarf. Gloves placed neatly, hands folded as if offering apology tonight. Neighbors leaned from windows, eyes bright with fearful curiosity today. Footprints in mud stopped abruptly, leaving a single shoe behind. A neighbor's dog howled, then fell silent like confession itself. Marlowe's notebook held yesterday's weather and today's uneasy signatures neatly. He tasted ash on his tongue as memory stirred again. Streetlamp buzzed, casting everyone's faces into small accusatory moons now.
created_at
"2026-02-16T13:27:50.297627+00:00"
2/16/2026, 1:27:50 PM
model
"openai/gpt-5-mini-2025-08-07"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
17875
moderation_latency
(null)
generation_time
21480
tokens_prompt
46
tokens_completion
284
native_tokens_prompt
41
native_tokens_completion
2055
native_tokens_completion_images
0
native_tokens_reasoning
1856
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
0.00412025
router
(null)
provider_responses
0
id
"resp_040006986e531c4a0169931b406e908195bd44e58d9c3d9db7"
status
200
is_byok
false
latency
131
endpoint_id
"c4f66d01-20b0-4c27-a225-438ea22fda43"
provider_name
"OpenAI"
model_permaslug
"openai/gpt-5-mini-2025-08-07"
api_type
"completions"
id
"gen-1771248448-mf30LlD51050Zl9S3pVL"
upstream_id
"resp_040006986e531c4a0169931b406e908195bd44e58d9c3d9db7"
total_cost
0.00412025
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
11
wordCounts
0
10
1
10
2
10
3
10
4
10
5
10
6
10
7
10
8
10
9
10
10
10