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Run: 2026-03-18-01KM0AGZJ5M7639SF3YB14TV6V
Run Details
Model:
GPT-5.4 Nano (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
10.3s
Cost:
$0.001262
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 tapped the boarded windows of Graywick Manor as I arrived, notebook open, searching for the missing jeweler today. In the foyer, lanterns flickered, and Detective Sloane whispered that someone found him dead beside the fountain at dawn quietly. I stepped over fallen roses, noticing a faint perfume trail leading toward the library door, swollen with damp fog inside. Sloane handed me a keyring slick with blood, warning that the lockbox held only receipts and lies this night too. Behind the glass display, the jeweler’s emerald disappeared, leaving powdery footprints that vanished into dust nearby almost immediately without sound. A maid trembled by the stairs, insisting she heard singing, then a crash, before silence swallowed everything for minutes straight. When Sloane lifted the corpse’s cuff, a torn cufflink glinted, engraved with initials L.R from someone who knew Graywick intimately.
created_at
"2026-03-18T11:15:35.634Z"
3/18/2026, 11:15:35 AM
model
"openai/gpt-5.4-nano-20260317"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
9903
moderation_latency
(null)
generation_time
10096
tokens_prompt
46
tokens_completion
637
native_tokens_prompt
41
native_tokens_completion
1003
native_tokens_completion_images
0
native_tokens_reasoning
809
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
0.00126195
router
(null)
provider_responses
0
endpoint_id
"0c835f2e-c18d-4e8c-b245-e1e3bd08b97f"
id
"resp_019933666a4b14620169ba8957b0b8819783fdecd455f5aa2e"
is_byok
false
latency
157
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-1773832535-m2Tg2xbAmZnOSPXJcxyP"
upstream_id
"resp_019933666a4b14620169ba8957b0b8819783fdecd455f5aa2e"
total_cost
0.00126195
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