Run: 2026-03-18-01KM096QQ5SFSRNF2EHZK1RMRK

Run Details

Duration:
2.0s
Cost:
$0.000209
Provider:
OpenAI

Evaluation summary

Score Evaluator
Details Link
11.08% 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
Detective Mara Venn arrived at Alderwick Station, where rain fell steadily and passengers whispered around a silent body. The victim lay beside the locked luggage office, one glove missing, while constable Holt guarded the warped doorframe carefully. Inspector Kellan insisted it was theft gone wrong, yet the brass keyhole gleamed oddly under lantern light. Mara noticed fresh bootprints ending abruptly at puddles, then continuing as faint streaks toward river reeds. A conductor swore he heard arguing at midnight, and then a single scream dissolved into locomotive hiss. On the platform, a violin case sat untouched, despite frost, its clasp engraved with the letter A. Mara asked for the timetable ledger, and Holt produced it, trembling like paper near flame.
created_at"2026-03-18T10:52:31.348Z" 3/18/2026, 10:52:31 AM
model"openai/gpt-5.4-nano-20260317"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency1123
moderation_latency(null)
generation_time1907
tokens_prompt46
tokens_completion199
native_tokens_prompt41
native_tokens_completion161
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"
usage0.00020945
router(null)
provider_responses
0
endpoint_id"0c835f2e-c18d-4e8c-b245-e1e3bd08b97f"
id"resp_02b8f1012d0c59b90169ba83ef6acc8190ad379a86eabece8a"
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-1773831151-PTeMxvC5njPwWUsaXHv4"
upstream_id"resp_02b8f1012d0c59b90169ba83ef6acc8190ad379a86eabece8a"
total_cost0.00020945
cache_discount(null)
upstream_inference_cost0
provider_name"OpenAI"

Evaluation details

Result Evaluator Details Meta Data
11.08% Matches word count n/a
neededCleanfalse
sentences7
wordCounts
018
119
217
316
417
517
615