Run: 2026-04-24-01KQ0PKJEMX4FG2DJMPNNZ1Y0J

Run Details

Duration:
19.9s
Cost:
$0.052705
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 hammered the stained glass roof as Inspector Vale arrived at Blackthorn Hall before the dinner bell stopped trembling tonight. Inside, twelve guests stood frozen around Lord Ashcombe, whose white shirt bloomed red beneath the gleaming silver ceremonial carving knife. The candles guttered when thunder rolled, and every shadow seemed to step closer to the body on the parquet floor. Vale removed his gloves, noticed bloodless fingertips, and asked who had touched the knife since the scream in the library. No one answered, but Lady Ashcombe laughed once, softly, as if hearing a private joke from beyond the grave itself. At her feet, a broken pocket watch ticked backward, though its hands were smeared with clotted blood and black ash. Vale knelt beside it and saw an engraving scratched fresh across the case: Remember the drowned girl beneath the pier. Before he could rise, the lights failed, and another guest whispered his name in the dark with terrible certainty nearby.
created_at"2026-04-24T21:33:48.907Z" 4/24/2026, 9:33:48 PM
model"openai/gpt-5.5-20260423"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency18645
moderation_latency(null)
generation_time19705
tokens_prompt46
tokens_completion259
native_tokens_prompt41
native_tokens_completion1750
native_tokens_completion_images0
native_tokens_reasoning1552
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"
usage0.052705
router(null)
provider_responses
0
endpoint_id"58e5b336-423e-430b-a2ab-8bc353f0c51b"
id"resp_00d1b0a7ad0fe9e70169ebe1bcfc108190956d7ef98d20abbe"
is_byokfalse
latency273
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-1777066428-j6TeRnQePYLwiEFkv8BN"
session_id(null)
api_type"completions"
id"gen-1777066428-iSGbYWbVcuMdjdLabpjx"
upstream_id"resp_00d1b0a7ad0fe9e70169ebe1bcfc108190956d7ef98d20abbe"
total_cost0.052705
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