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Run: 2026-03-18-01KM0AFNWCZXWG9DSPGQHGZ6YN
Run Details
Model:
GPT-5.4 Nano (Reasoning, Low)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
13.7s
Cost:
$0.001358
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 ticked against the manor windows as Detective Lark arrived, holding an umbrella and a folder of unanswered questions today. Inside, the housekeeper whispered that Lord Merrow vanished from his study, leaving only a locked iron key behind the desk. Sheriffs found him dead on the library rug, yet every clock there had stopped exactly midnight for the entire evening. Lark knelt beside the body, noting bruised wrists, cold tea, and a scent of almonds drifting upward from crushed glass. The coroner suggested poisoning, but the keyhole bore fresh scratches, like someone testing secrecy repeatedly under lamplight before disappearing quietly. Servants gathered nervously, blaming storms, strangers, or love, while Miss Elowen Merrow wept without tears and stared at her ring. Lark asked about the last visitor, and Master Finch offered a grin that never reached eyes during supper, he insisted. In the study, a revolver lay polished beside manuscripts, as if staged for a simpler story than anyone here expected.
created_at
"2026-03-18T11:14:52.952Z"
3/18/2026, 11:14:52 AM
model
"openai/gpt-5.4-nano-20260317"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
13199
moderation_latency
(null)
generation_time
13492
tokens_prompt
46
tokens_completion
925
native_tokens_prompt
41
native_tokens_completion
1080
native_tokens_completion_images
0
native_tokens_reasoning
862
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
0.0013582
router
(null)
provider_responses
0
endpoint_id
"0c835f2e-c18d-4e8c-b245-e1e3bd08b97f"
id
"resp_02751cf13e0ce5db0169ba892d03808197afe0a569038222ef"
is_byok
false
latency
170
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-1773832492-jSRic6f7HBVyyEW5Z6qV"
upstream_id
"resp_02751cf13e0ce5db0169ba892d03808197afe0a569038222ef"
total_cost
0.0013582
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
8
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
20
7
20