Run: 2026-03-18-01KM08CSH2YK08BVEF7T9JSF98

Run Details

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

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_id182717
external_user(null)
streamedtrue
cancelledfalse
latency8956
moderation_latency(null)
generation_time9166
tokens_prompt46
tokens_completion527
native_tokens_prompt41
native_tokens_completion945
native_tokens_completion_images0
native_tokens_reasoning788
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"
usage0.00118945
router(null)
provider_responses
0
endpoint_id"0c835f2e-c18d-4e8c-b245-e1e3bd08b97f"
id"resp_06f175380eae15c70169ba809d4d0c8196a3c9c9ef25fe44f2"
is_byokfalse
latency221
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-1773830301-qmVHYUz70dw1ntL8bXus"
upstream_id"resp_06f175380eae15c70169ba809d4d0c8196a3c9c9ef25fe44f2"
total_cost0.00118945
cache_discount(null)
upstream_inference_cost0
provider_name"OpenAI"

Evaluation details

Result Evaluator Details Meta Data
100.00% Matches word count n/a
neededCleanfalse
sentences6
wordCounts
020
120
220
320
420
520