Run: 2026-04-24-01KQ0P0NRCSP81DQXFJ87Y3DHC

Run Details

Duration:
14.8s
Cost:
$0.027715
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
Rain combed the windows of Blackthorn Manor while Inspector Vale arrived late, carrying a letter sealed with crimson wax tonight. Inside, the grandfather clock had stopped at midnight, though every guest insisted dinner ended before eleven exactly that stormy evening. Lord Ashbury lay beneath the portrait gallery, one hand clenched around a chess knight carved from bone and blackened silver. No blood marked his waistcoat, yet the scent of bitter almonds lingered above the polished parquet like accusation itself there. Lady Maren watched from the staircase, her pearls trembling softly against skin too pale for grief or innocence tonight either. The butler claimed the library door was locked, but Vale noticed fresh mud on the threshold beside the latch inside. Somewhere upstairs, a floorboard groaned, and seven frightened faces turned toward the darkness above as thunder answered sharply outside again. Vale broke the seal, unfolded the letter, and read the dead man's final invitation aloud to everyone waiting there nearby.
created_at"2026-04-24T21:23:29.685Z" 4/24/2026, 9:23:29 PM
model"openai/gpt-5.5-20260423"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency13644
moderation_latency(null)
generation_time13770
tokens_prompt46
tokens_completion673
native_tokens_prompt41
native_tokens_completion917
native_tokens_completion_images0
native_tokens_reasoning719
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"
usage0.027715
router(null)
provider_responses
0
endpoint_id"58e5b336-423e-430b-a2ab-8bc353f0c51b"
id"resp_00b1dce34574cc240169ebdf51c41c8194b4dfff57cd8bd943"
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-1777065809-Y0jvBeYcqRT5gDrlOdFh"
session_id(null)
api_type"completions"
id"gen-1777065809-WNdSl2XRxail9L7E4Mhk"
upstream_id"resp_00b1dce34574cc240169ebdf51c41c8194b4dfff57cd8bd943"
total_cost0.027715
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