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Run: 2026-03-18-01KM09HTYNKFXBV4JN2YMRSQ2E
Run Details
Model:
GPT-5.4 Nano (Reasoning, Low)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
7.0s
Cost:
$0.000972
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
The rain sealed Briarwood Pier in silence, and Detective Mara Ellison arrived at dawn with a dented notebook today alone. A fisherman lay facedown among gull feathers, his coat snagged on rusted pilings beneath the pier’s lanterns flickering weakly outside. Mara knelt, noting no blood pool, only a chalky bruise at his throat and strange mint odor from his pocket. Constable Reyes whispered that the victim’s watch stopped exactly at 3:13, though clocks nearby disagreed by minutes each hour yesterday. On the boards, a single bootprint circled him twice, as if someone measured steps carefully before disappearing into fog again. When the mayor’s secretary arrived, she carried gloves and requested privacy, smiling at Mara’s questions too brightly for this scene.
created_at
"2026-03-18T10:58:35.103Z"
3/18/2026, 10:58:35 AM
model
"openai/gpt-5.4-nano-20260317"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
6651
moderation_latency
(null)
generation_time
6829
tokens_prompt
46
tokens_completion
530
native_tokens_prompt
41
native_tokens_completion
771
native_tokens_completion_images
0
native_tokens_reasoning
599
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
0.00097195
router
(null)
provider_responses
0
endpoint_id
"0c835f2e-c18d-4e8c-b245-e1e3bd08b97f"
id
"resp_0c31075cdb627e680169ba855b2b348196ae3a8dde8e1f2399"
is_byok
false
latency
209
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-1773831515-1j6nTQcmaAyuQ1Nl9Xq2"
upstream_id
"resp_0c31075cdb627e680169ba855b2b348196ae3a8dde8e1f2399"
total_cost
0.00097195
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