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Run: 2026-03-18-01KM0ANJ98S7NFKHFDXBAFRDST
Run Details
Model:
GPT-5.4 Nano (Reasoning, Low)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
8.8s
Cost:
$0.001207
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 tapped the windows of Alderwick Hotel as detectives gathered, summoned by a scream from the ballroom at midnight quietly. Sergeant Hale studied the silent foyer, noticing fresh footprints leading from the doors toward a locked side office alone today. Inside, Mrs. Larkin lay beneath shattered chandeliers, her pearls scattered like stars across polished marble beneath the dim, swaying lights. Dr. Voss arrived with a case notebook, counting bruises, and refusing to touch anything until photographs were taken first carefully. The guests waited behind velvet curtains, each claiming innocence, while piano music ended abruptly after the scream for them all. Captain Rourke questioned the pianist, who swore his hands trembled when a stranger asked for quiet near the bar corner. Hale noticed a wilted lily in her fist, wrapped around a torn invitation bearing crimson wax matching last week's seal.
created_at
"2026-03-18T11:18:05.876Z"
3/18/2026, 11:18:05 AM
model
"openai/gpt-5.4-nano-20260317"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
8433
moderation_latency
(null)
generation_time
8619
tokens_prompt
46
tokens_completion
677
native_tokens_prompt
41
native_tokens_completion
959
native_tokens_completion_images
0
native_tokens_reasoning
774
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
0.00120695
router
(null)
provider_responses
0
endpoint_id
"0c835f2e-c18d-4e8c-b245-e1e3bd08b97f"
id
"resp_0167133f7df27b8e0169ba89edee148193b5c37ad041713fbe"
is_byok
false
latency
183
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-1773832685-M0ixOtHVDsJhpFHGvChU"
upstream_id
"resp_0167133f7df27b8e0169ba89edee148193b5c37ad041713fbe"
total_cost
0.00120695
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
7
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
20