Run: 2026-04-24-01KQ0NHVJQKRQZ6C4A873GH7QG

Run Details

Model:
GPT-5.5
Duration:
5.0s
Cost:
$0.004435
Provider:
OpenAI

Evaluation summary

Score Evaluator
Details Link
42.88% 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 lines across Blackthorn Manor while Inspector Vale counted thirteen dinner plates, though only twelve guests waited. The grandfather clock stopped at midnight, and beneath its hands, Lord Ashbury lay smiling with an ivory dagger protruding. No one screamed until the candles blew out, leaving perfume, wet wool, and one whisper: “He deserved worse tonight.” When light returned, every face displayed horror, yet each right hand remained hidden beneath the tablecloth deliberately. Vale noticed bloodless cuffs, muddy hems, and a single black chess queen resting inside the dead man's open palm. Outside, the storm erased carriage tracks, while inside, the murderer learned the inspector had locked every door himself.
created_at"2026-04-24T21:15:24.128Z" 4/24/2026, 9:15:24 PM
model"openai/gpt-5.5-20260423"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency648
moderation_latency(null)
generation_time4763
tokens_prompt46
tokens_completion195
native_tokens_prompt41
native_tokens_completion141
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)
num_fetches(null)
web_search_engine(null)
origin"https://ncbench.com/"
is_byokfalse
finish_reason"stop"
native_finish_reason"completed"
usage0.004435
router(null)
provider_responses
0
endpoint_id"58e5b336-423e-430b-a2ab-8bc353f0c51b"
id"resp_015a6d0e8294e5bc0169ebdd6c348881968992aba09b5b6faf"
is_byokfalse
latency274
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-1777065324-kaCqIbzphoaeQ5GxBqFP"
session_id(null)
api_type"completions"
id"gen-1777065324-lf5Yy1hg6aZkNe1u1pVG"
upstream_id"resp_015a6d0e8294e5bc0169ebdd6c348881968992aba09b5b6faf"
total_cost0.004435
cache_discount(null)
upstream_inference_cost0
provider_name"OpenAI"
response_cache_source_id(null)

Evaluation details

Result Evaluator Details Meta Data
42.88% Matches word count n/a
neededCleanfalse
sentences6
wordCounts
019
119
219
317
419
518