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Run: 2026-03-18-01KM0ATR9Q0JKD0SWNY3412FCK
Run Details
Model:
GPT-5.4 Nano
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
1.5s
Cost:
$0.000242
Provider:
OpenAI
Evaluation summary
Score
Evaluator
Details Link
3.68%
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
Detective Mara Ellison arrived at Briarwood Manor as the rain stopped, yet fear lingered along corridors. The butler insisted Sir Aldren died peacefully, though a clockwork bird lay shattered near the conservatory window. Guests gathered around the lamplit foyer, arguing softly over alibis, while candle smoke twisted like secrets. From her pocket, Mara produced gloves and a notebook, noting muddy footprints ending abruptly beside a rug. A maid whispered that someone had locked the library door from outside, then vanished before midnight. In the study, she found ink-spattered letters, a missing vial, and a knife still wet with something dark. Inspector Havel frowned, mentioning the will's draft, and pointed toward a bloodless scratch on the desk. Mara knelt near the bird pieces, noticing a gold key etched with initials, not belonging to Sir Aldren.
created_at
"2026-03-18T11:20:55.875Z"
3/18/2026, 11:20:55 AM
model
"openai/gpt-5.4-nano-20260317"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
481
moderation_latency
(null)
generation_time
1271
tokens_prompt
46
tokens_completion
224
native_tokens_prompt
41
native_tokens_completion
187
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
0.00024195
router
(null)
provider_responses
0
endpoint_id
"0c835f2e-c18d-4e8c-b245-e1e3bd08b97f"
id
"resp_0516c77138091ed80169ba8a97f33c8194871156ec670c19e9"
is_byok
false
latency
210
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-1773832855-FX54ARFTD8bLEXQdShF5"
upstream_id
"resp_0516c77138091ed80169ba8a97f33c8194871156ec670c19e9"
total_cost
0.00024195
cache_discount
(null)
upstream_inference_cost
0
provider_name
"OpenAI"
Evaluation details
Result
Evaluator
Details
Meta Data
3.68%
Matches word count
n/a
neededClean
false
sentences
8
wordCounts
0
16
1
17
2
16
3
17
4
16
5
18
6
16
7
18