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Run: 2026-03-18-01KM0ADRZK5YZYRBZZ3MQGPE5V
Run Details
Model:
GPT-5.4 Nano
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
1.5s
Cost:
$0.000282
Provider:
OpenAI
Evaluation summary
Score
Evaluator
Details Link
0.23%
Matches word count
(details)
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
Night settled over Marrowick Harbor, and gulls circled silently above the fog-choked pier where secrets waited. Detective Eliana Voss arrived at dawn, drawn by a corpse found beside the old lighthouse steps, still. Fishermen whispered that Captain Hargrove quarreled yesterday, yet no one mentioned the missing ledger kept. The victim lay sprawled face down, pockets turned out, and a peculiar silver key gleamed beside him. Eliana knelt carefully, noticing saltwater droplets on glassy eyes, as if something watched. Behind her, Inspector Marr argued with the coroner about time of death and motive. A storm lantern flickered near the body, illuminating footprints leading inward toward closed warehouses. Eliana read a torn note clutched in Hargrove’s hand, promising payment, then silence. When she unfolded it, ink bore three initials, but the last letter had been deliberately scratched. From the warehouse, a music box began playing, soft and tinny, like a warning.
created_at
"2026-03-18T11:13:50.592Z"
3/18/2026, 11:13:50 AM
model
"openai/gpt-5.4-nano-20260317"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
460
moderation_latency
(null)
generation_time
1269
tokens_prompt
46
tokens_completion
255
native_tokens_prompt
41
native_tokens_completion
219
native_tokens_completion_images
0
native_tokens_reasoning
0
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
0.00028195
router
(null)
provider_responses
0
endpoint_id
"0c835f2e-c18d-4e8c-b245-e1e3bd08b97f"
id
"resp_04798f344fe934cb0169ba88eea6808196a9bdb09a70cb07f5"
is_byok
false
latency
201
model_permaslug
"openai/gpt-5.4-nano-20260317"
provider_name
"OpenAI"
status
200
user_agent
"langchainjs-openai/1.0.0 ((node/v24.14.0; linux; x64))"
http_referer
(null)
api_type
"completions"
id
"gen-1773832430-rC2j9z8Ib3SU9RAjVNkU"
upstream_id
"resp_04798f344fe934cb0169ba88eea6808196a9bdb09a70cb07f5"
total_cost
0.00028195
cache_discount
(null)
upstream_inference_cost
0
provider_name
"OpenAI"
Evaluation details
Result
Evaluator
Details
Meta Data
0.23%
Matches word count
n/a
neededClean
false
sentences
10
wordCounts
0
16
1
17
2
15
3
17
4
13
5
14
6
14
7
13
8
16
9
14