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Run: 2026-03-18-01KM08CSH2YK08BVEF7T9JSF98
Run Details
Model:
GPT-5.4 Nano (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
9.3s
Cost:
$0.001189
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 rattled the courthouse windows as Detective Mara Voss stepped inside, listening to whispers from the locked evidence room tonight. A pale clerk pointed toward a corpse in velvet gloves, claiming the victim vanished from his cell earlier today alone. Mara knelt, noticing ink stains on the floor and a single key labeled L-7 beside him under broken lamplight carefully. The coroner murmured death arrived quickly, yet no one heard screams through thick plaster walls at midnight anywhere nearby ever. Justice Hall Superintendent Dorian Pike insisted the key was impossible, since L-7 belonged to records only he could access daily. As phones went unanswered, Mara asked who benefited from a corpse appearing without paperwork, and the night listened hard now.
created_at
"2026-03-18T10:38:21.229Z"
3/18/2026, 10:38:21 AM
model
"openai/gpt-5.4-nano-20260317"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
8956
moderation_latency
(null)
generation_time
9166
tokens_prompt
46
tokens_completion
527
native_tokens_prompt
41
native_tokens_completion
945
native_tokens_completion_images
0
native_tokens_reasoning
788
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
0.00118945
router
(null)
provider_responses
0
endpoint_id
"0c835f2e-c18d-4e8c-b245-e1e3bd08b97f"
id
"resp_06f175380eae15c70169ba809d4d0c8196a3c9c9ef25fe44f2"
is_byok
false
latency
221
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-1773830301-qmVHYUz70dw1ntL8bXus"
upstream_id
"resp_06f175380eae15c70169ba809d4d0c8196a3c9c9ef25fe44f2"
total_cost
0.00118945
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