Run: 2026-04-24-01KQ0NZND0HGV7NM95TXNCFWZX

Run Details

Duration:
17.0s
Cost:
$0.037345
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
At midnight, the grandfather clock stopped, and every candle in Blackthorn Manor guttered as if remembering a secret long buried. Inspector Vale arrived through rain, his coat shining black, while servants huddled beneath portraits of unsmiling ancestors in cold silence. Lady Maribel lay beside the music room piano, one gloved hand clenched around a torn crimson ribbon and silver key. No one admitted hearing screams, though the storm had paused for three impossible minutes before the discovery in the dark. Her husband stood rigidly by the hearth, smelling faintly of brandy, tobacco, and freshly turned garden earth after midnight rain. In the corridor, a maid wept over broken lilies, insisting they had not been there at supper or afterward either. Vale noticed muddy footprints crossing the polished floor, stopping neatly beneath the locked conservatory door from inside the house itself. Then the dead woman's canary began singing upstairs, inside a room everyone swore was empty until dawn's first bell rang.
created_at"2026-04-24T21:22:56.564Z" 4/24/2026, 9:22:56 PM
model"openai/gpt-5.5-20260423"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency15816
moderation_latency(null)
generation_time16816
tokens_prompt46
tokens_completion528
native_tokens_prompt41
native_tokens_completion1238
native_tokens_completion_images0
native_tokens_reasoning1034
native_tokens_cached0
num_media_prompt(null)
num_input_audio_prompt(null)
num_media_completion0
num_search_results(null)
num_fetches(null)
web_search_engine(null)
origin"https://ncbench.com/"
is_byokfalse
finish_reason"stop"
native_finish_reason"completed"
usage0.037345
router(null)
provider_responses
0
endpoint_id"58e5b336-423e-430b-a2ab-8bc353f0c51b"
id"resp_0464b76902979a3f0169ebdf30a85c8196bb03e55cd509ea2d"
is_byokfalse
latency345
model_permaslug"openai/gpt-5.5-20260423"
provider_name"OpenAI"
status200
user_agent"langchainjs-openai/1.0.0 ((node/v24.14.1; linux; x64))"
http_referer(null)
request_id"req-1777065776-3vdWOSerkttT5nDjmdRD"
session_id(null)
api_type"completions"
id"gen-1777065776-ZKput7SpJ7nIKxBKuvyD"
upstream_id"resp_0464b76902979a3f0169ebdf30a85c8196bb03e55cd509ea2d"
total_cost0.037345
cache_discount(null)
upstream_inference_cost0
provider_name"OpenAI"
response_cache_source_id(null)

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