Run: 2026-04-24-01KQ0P2MECVWBMXA2RA5C0K767

Run Details

Duration:
18.6s
Cost:
$0.034285
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 stitched silver threads across Blackthorn Manor as Inspector Vale arrived, finding every window blazing except the library's darkened one. Inside, a grandfather clock hammered midnight while servants whispered beside portraits whose painted eyes seemed freshly frightened by something unseen. Lord Ashbury lay sprawled over scattered telegrams, one gloved hand clutching a chess knight carved from ivory and stained scarlet. No blood marked his dinner jacket, yet the air smelled sharply of almonds, smoke, and extinguished candles after desperate prayer. Lady Ashbury stood motionless near the mantel, her pearls broken, her smile too careful for newly widowed grief tonight alone. When Vale asked who discovered him, three guests answered together, then stared at each other in sudden terror and silence. On the desk, beneath Ashbury's cold cheek, someone had written tomorrow's date in ink still glistening wet beside his name. Vale removed his hat slowly, because the locked door had been bolted from the inside with ceremonial precision and purpose.
created_at"2026-04-24T21:24:33.874Z" 4/24/2026, 9:24:33 PM
model"openai/gpt-5.5-20260423"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency17976
moderation_latency(null)
generation_time18349
tokens_prompt46
tokens_completion674
native_tokens_prompt41
native_tokens_completion1136
native_tokens_completion_images0
native_tokens_reasoning930
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"
usage0.034285
router(null)
provider_responses
0
endpoint_id"58e5b336-423e-430b-a2ab-8bc353f0c51b"
id"resp_0a6ea25039ca046c0169ebdf925bf481949dbcaf73fb88e90d"
is_byokfalse
latency997
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-1777065873-wtCUkKR6PKfEswJXHw2c"
session_id(null)
api_type"completions"
id"gen-1777065873-rDnfxUo6vYEa3VWsteuF"
upstream_id"resp_0a6ea25039ca046c0169ebdf925bf481949dbcaf73fb88e90d"
total_cost0.034285
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