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Run: 2026-03-18-01KM08M6JH7N0908NGSF6JKT7W
Run Details
Model:
GPT-5.4 Nano (Reasoning, Low)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
3.8s
Cost:
$0.001001
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 hammered Ellery Quay, while Inspector Marlowe waited beside the silent carriage house behind Captain Voss's estate tonight alone. A servant whispered that Voss vanished after dinner, and now his study door lay unlocked, slightly ajar for hours straight. Marlowe lifted the lantern, noting fresh boot prints leading inward, then stopping abruptly at scattered rose petals near a drain. Inside, the air smelled of clove cigarettes, yet the windows were bolted shut against the storm outside all night long. On the desk, a bloodless knife rested beside Voss's journal, its pages torn neatly, like deliberate curtains for deception only. When Marlowe found Voss on the hearth rug, his pulse was gone, and everyone pretended surprise at the wrong moment.
created_at
"2026-03-18T10:42:23.966Z"
3/18/2026, 10:42:23 AM
model
"openai/gpt-5.4-nano-20260317"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
3439
moderation_latency
(null)
generation_time
3726
tokens_prompt
46
tokens_completion
196
native_tokens_prompt
41
native_tokens_completion
794
native_tokens_completion_images
0
native_tokens_reasoning
626
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
0.0010007
router
(null)
provider_responses
0
endpoint_id
"0c835f2e-c18d-4e8c-b245-e1e3bd08b97f"
id
"resp_081b32a502dd17380169ba819005e48195815c6d9bb2a1f0dc"
is_byok
false
latency
213
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-1773830543-fSqinBlzGGDxnFYJP8U4"
upstream_id
"resp_081b32a502dd17380169ba819005e48195815c6d9bb2a1f0dc"
total_cost
0.0010007
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