Run: 2026-03-18-01KM09DPH58J4T1NRATKD86DDB

Run Details

Duration:
1.4s
Cost:
$0.000778
Provider:
OpenAI

Evaluation summary

Score Evaluator
Details Link
86.88% 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 stitched the manor windows shut as twelve guests gathered beneath chandeliers, each pretending not to notice the bloodstained key. Inspector Vale arrived at midnight, carrying a telegram, a lantern, and the unsettling certainty that someone here had already vanished. In the library, a portrait of the late Mr. Ashcroft watched them all, its painted eyes fixed on the closed door. When the clock struck one, the housekeeper screamed, because the study door opened inward, revealing his body beside the extinguished fire. No one moved until Vale noticed the knife missing from the breakfast table, the one every guest had touched tonight. Outside, thunder rolled over the marshes, and inside, the guests began lying, one by one, with remarkable and terrible confidence.
created_at"2026-03-18T10:56:19.507Z" 3/18/2026, 10:56:19 AM
model"openai/gpt-5.4-mini-20260317"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency395
moderation_latency(null)
generation_time1324
tokens_prompt46
tokens_completion200
native_tokens_prompt41
native_tokens_completion166
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"
usage0.00077775
router(null)
provider_responses
0
endpoint_id"9ee065b2-3d1c-43bc-bdd7-28af3b148282"
id"resp_0fc22bed2edebfb50169ba84d38fe88190bda43d6e32c1e393"
is_byokfalse
latency172
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-1773831379-Mcxk3CU54iiWSW6ZtzQ9"
upstream_id"resp_0fc22bed2edebfb50169ba84d38fe88190bda43d6e32c1e393"
total_cost0.00077775
cache_discount(null)
upstream_inference_cost0
provider_name"OpenAI"

Evaluation details

Result Evaluator Details Meta Data
86.88% Matches word count n/a
neededCleanfalse
sentences6
wordCounts
020
120
221
321
420
520