Run: 2026-04-24-01KQ0Q1N372M94YBZ99X4EQPD4

Run Details

Duration:
14.5s
Cost:
$0.029425
Provider:
OpenAI

Evaluation summary

Score Evaluator
Details Link
95.08% 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's windows while Inspector Vale arrived late, carrying a telegram and troubled patience in silence. Inside, the grandfather clock had stopped at midnight, though every guest swore they had heard thirteen chimes from upstairs clearly. Lord Blackthorn lay beneath the portrait gallery's skylight, one hand clenched around a torn white glove stained with ink tonight. No blood marked his evening coat, only a dark crescent bruise blooming above his pearl collar like hidden moonrise there. Lady Miriam stood nearest, smelling faintly of violets, with rainwater shining on her unbuttoned satin shoes beside the body alone. The butler insisted the library doors were locked, yet the key rested inside Vale's empty teacup still warm from service. When lightning revealed muddy footprints crossing the Persian carpet, everyone looked down except the dead man's brother near the window. Vale opened his notebook, and somewhere behind the walls, a woman began laughing softly, then abruptly stopped as candles guttered.
created_at"2026-04-24T21:41:30.349Z" 4/24/2026, 9:41:30 PM
model"openai/gpt-5.5-20260423"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency13711
moderation_latency(null)
generation_time14366
tokens_prompt46
tokens_completion572
native_tokens_prompt41
native_tokens_completion974
native_tokens_completion_images0
native_tokens_reasoning766
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"
usage0.029425
router(null)
provider_responses
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endpoint_id"58e5b336-423e-430b-a2ab-8bc353f0c51b"
id"resp_0a14c4eb510102290169ebe38a6b988195a74d4abdbf64db7e"
is_byokfalse
latency317
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-1777066890-1n0MnKR0F0BUtq5SVjUL"
session_id(null)
api_type"completions"
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upstream_id"resp_0a14c4eb510102290169ebe38a6b988195a74d4abdbf64db7e"
total_cost0.029425
cache_discount(null)
upstream_inference_cost0
provider_name"OpenAI"
response_cache_source_id(null)

Evaluation details

Result Evaluator Details Meta Data
95.08% Matches word count n/a
neededCleanfalse
sentences8
wordCounts
021
120
220
320
420
520
620
720