Run: 2026-04-24-01KQ0NKY3D1BNVT5R3HNSWP61N

Run Details

Duration:
14.2s
Cost:
$0.028975
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 bells of Blackthorn Hall shivered through rain, waking Clara Vale beside her dying fire and cold ashes. She smelled candle smoke before she heard the scream, thin as wire, rising from the locked library below in darkness. By the time she reached the stairs, every portrait seemed to watch her with varnished, accusing eyes from the walls. Lord Ashcombe lay across the Persian rug, one hand clenched around a silver chess queen, his blood black beneath him. The windows were bolted, the key remained inside, and no muddy footprint disturbed the polished floor near his silent body. Only the grandfather clock had stopped, its hands fixed at twelve minutes past a quarter past one that wet morning. Clara knelt, noticing a scrap of blue silk tucked beneath the dead man's collar like a small secret flag there. Behind her, someone whispered that murder had finally come home, and the candles guttered in agreement throughout the watching house.
created_at"2026-04-24T21:16:32.245Z" 4/24/2026, 9:16:32 PM
model"openai/gpt-5.5-20260423"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency12612
moderation_latency(null)
generation_time14037
tokens_prompt46
tokens_completion555
native_tokens_prompt41
native_tokens_completion959
native_tokens_completion_images0
native_tokens_reasoning762
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"
usage0.028975
router(null)
provider_responses
0
endpoint_id"58e5b336-423e-430b-a2ab-8bc353f0c51b"
id"resp_0e25fda346f3761d0169ebddb05ce48194968b33bfcc9b783e"
is_byokfalse
latency329
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-1777065392-w4k8DoyfJJEVTEoEYm6z"
session_id(null)
api_type"completions"
id"gen-1777065392-UnR4x62z8eMFQUslgBnL"
upstream_id"resp_0e25fda346f3761d0169ebddb05ce48194968b33bfcc9b783e"
total_cost0.028975
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