Run: 2026-03-18-01KM07DJPFB6KMAQ45JV0WA78G

Run Details

Duration:
1.5s
Cost:
$0.000877
Provider:
OpenAI

Evaluation summary

Score Evaluator
Details Link
76.41% 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 polished the manor windows as Detective Vale arrived, summoned by a trembling housekeeper who refused to meet his eyes. Inside, the guests clustered beneath chandeliers, their laughter brittle, their champagne untouched, while somewhere above them, a door slammed. Vale found the body in the library, sprawled beside a toppled lamp, one hand clutching a letter stained with wax. The victim, Sir Alistair Morrow, still wore his dinner jacket, though his throat bore a thin, precise line of crimson. No one had entered the room since midnight, said the butler, yet mud tracked across the carpet told another story. Vale knelt beside the hearth, noting the missing portrait, the broken clock, and the scent of jasmine lingering faintly. Then he noticed the letter addressed to his own name, and everyone in the room suddenly stopped breathing.
created_at"2026-03-18T10:21:18.426Z" 3/18/2026, 10:21:18 AM
model"openai/gpt-5.4-mini-20260317"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency401
moderation_latency(null)
generation_time1346
tokens_prompt46
tokens_completion219
native_tokens_prompt41
native_tokens_completion188
native_tokens_completion_images0
native_tokens_reasoning0
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"
usage0.00087675
router(null)
provider_responses
0
endpoint_id"9ee065b2-3d1c-43bc-bdd7-28af3b148282"
id"resp_0a088036c03d1f9a0169ba7c9e7e9c81938788ef68afe3ecfe"
is_byokfalse
latency190
model_permaslug"openai/gpt-5.4-mini-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-1773829278-3XEiTxVRShdlUPkWJVex"
upstream_id"resp_0a088036c03d1f9a0169ba7c9e7e9c81938788ef68afe3ecfe"
total_cost0.00087675
cache_discount(null)
upstream_inference_cost0
provider_name"OpenAI"

Evaluation details

Result Evaluator Details Meta Data
76.41% Matches word count n/a
neededCleanfalse
sentences7
wordCounts
020
119
220
320
420
519
618