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Run: 2026-02-16-01KHKAQPH7KHQDC2C70JTESE5Q
Run Details
Model:
GPT-5
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
43.6s
Cost:
$0.028151
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
Rain stitched silver lines across the harbor as the night ferry exhaled, delivering strangers and rumors to Graywharf that night. The lighthouse blinked a tired warning, while gulls circled like gossipers, hungry for misfortune and yesterday's forgotten confessions to feast. Detective Mara Vale stepped ashore, coat heavy with brine, eyes cataloging exits, faces, and the clockwork tidebooker's stall by customs. Graywharf Inn breathed warmth and smoke, yet its lobby fell silent when the bell clanged like a startled heart inside. Behind the desk, Mrs. Keene's smile misfired, landing crooked, as thunder rehearsed excuses no guest had requested for late arrivals. Room keys glittered like baited hooks, and someone had taken three, though only two rooms held registered breathing occupants tonight. In the parlor, a grandfather clock coughed twice, then choked forever, just as a scream severed conversation into ribbons downstairs. They found him among postcards and maps, the tidebooker, throat inked crimson, hands clenched around a stubborn brass compass tight. A puddle rat navigated the spreading red, fearless, while whispers tallied suspects like coins: captain, widow, drifter, minister and innkeeper. Mara knelt, counted secrets in silence, and noticed wet sand on windowsills, as the storm forgot to close doors behind.
created_at
"2026-02-16T13:38:28.623385+00:00"
2/16/2026, 1:38:28 PM
model
"openai/gpt-5-2025-08-07"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
4849
moderation_latency
(null)
generation_time
43522
tokens_prompt
46
tokens_completion
805
native_tokens_prompt
41
native_tokens_completion
2810
native_tokens_completion_images
0
native_tokens_reasoning
2496
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
0.02815125
router
(null)
provider_responses
0
id
"resp_03f565c0897c04900169931da894c4819483a223687e1cd97b"
status
200
is_byok
false
latency
171
endpoint_id
"7c2f859a-7890-4e8e-b1de-1cd1c0a800b4"
provider_name
"OpenAI"
model_permaslug
"openai/gpt-5-2025-08-07"
api_type
"completions"
id
"gen-1771249064-uNJv9f2eK2n9WTT5h9tZ"
upstream_id
"resp_03f565c0897c04900169931da894c4819483a223687e1cd97b"
total_cost
0.02815125
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
10
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
20
7
20
8
20
9
20