Run: 2026-03-18-01KM0AFNWCZXWG9DSPGQHGZ6YN

Run Details

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

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_id182717
external_user(null)
streamedtrue
cancelledfalse
latency13199
moderation_latency(null)
generation_time13492
tokens_prompt46
tokens_completion925
native_tokens_prompt41
native_tokens_completion1080
native_tokens_completion_images0
native_tokens_reasoning862
native_tokens_cached0
num_media_prompt(null)
num_input_audio_prompt(null)
num_media_completion0
num_search_results(null)
origin"https://ncbench.com/"
is_byokfalse
finish_reason"stop"
native_finish_reason"completed"
usage0.0013582
router(null)
provider_responses
0
endpoint_id"0c835f2e-c18d-4e8c-b245-e1e3bd08b97f"
id"resp_02751cf13e0ce5db0169ba892d03808197afe0a569038222ef"
is_byokfalse
latency170
model_permaslug"openai/gpt-5.4-nano-20260317"
provider_name"OpenAI"
status200
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_cost0.0013582
cache_discount(null)
upstream_inference_cost0
provider_name"OpenAI"

Evaluation details

Result Evaluator Details Meta Data
100.00% Matches word count n/a
neededCleanfalse
sentences8
wordCounts
020
120
220
320
420
520
620
720