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Run: 2026-03-09-01KK9QNG8G77VEME4YTP1EVAPW
Run Details
Model:
GPT-5.4 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
19.5s
Cost:
$0.018058
Provider:
OpenAI
Evaluation summary
Score
Evaluator
Details Link
100.00%
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
Rain worried the mansion windows while Detective Mara Vale climbed the steps, summoned at dawn by voice trembling with terror. Inside, the chandeliers glowed weakly above servants huddled like mourners, each face pale enough to rival ancestral portraits lining walls. At the library threshold, she smelled cordite, roses, and seawater, then saw Lord Bellamy slumped across his mahogany desk alone. His signet ring gleamed beside an overturned glass, while the grandfather clock ticked on, indifferent as a patient executioner nearby. No blood marked the carpet, yet a single wet footprint led from the balcony, stopping precisely beneath Bellamy's cold hand. Mara removed her gloves, knowing the storm outside had already washed away answers and perhaps delivered the killer to her.
created_at
"2026-03-09T16:42:43.354Z"
3/9/2026, 4:42:43 PM
model
"openai/gpt-5.4-20260305"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
18013
moderation_latency
(null)
generation_time
19362
tokens_prompt
46
tokens_completion
202
native_tokens_prompt
41
native_tokens_completion
1197
native_tokens_completion_images
0
native_tokens_reasoning
1030
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
0.0180575
router
(null)
provider_responses
0
endpoint_id
"9ff5625c-403f-4d7f-b895-58ac7295062c"
id
"resp_02ba8ce58f6d98040169aef883725881979946cc24ed0ad498"
is_byok
false
latency
210
model_permaslug
"openai/gpt-5.4-20260305"
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-1773074563-3o4JpbvMJM0idfjgJenA"
upstream_id
"resp_02ba8ce58f6d98040169aef883725881979946cc24ed0ad498"
total_cost
0.0180575
cache_discount
(null)
upstream_inference_cost
0
provider_name
"OpenAI"
Evaluation details
Result
Evaluator
Details
Meta Data
100.00%
Matches word count
n/a
neededClean
false
sentences
6
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20