Run: 2026-04-24-01KQ0P5TKR9SZBQ3B71R730FMM

Run Details

Duration:
17.0s
Cost:
$0.035545
Provider:
OpenAI

Evaluation summary

Score Evaluator
Details Link
95.63% 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 glass roof of Blackthorn Station as Inspector Vale arrived, summoned by a telegram without signature tonight alone. Inside, the midnight train stood steaming, its first class carriage locked, curtains drawn, and every brass handle wiped perfectly clean. The stationmaster waited beneath the clock, twisting his cap, while a porter sobbed silently beside abandoned trunks near platform seven alone. Vale saw the blood first, a narrow ribbon escaping beneath the compartment door and darkening the polished floorboards like ink. No passenger admitted knowing the victim, though six held tickets purchased together under a name nobody recognized at the office. From within the sealed carriage came a woman's laugh, soft, impossible, and followed immediately by three deliberate knocks against wood. Vale ordered silence, raised his lantern, and noticed snow melting across the threshold, though no snow had fallen that week. When the key turned finally, the door opened inward upon Lord Harbury, dead, smiling, and clutching a violet between fingers. Pinned to his lapel was a card reading, Vale, forgive me, but tonight you must suspect everyone, including the dead.
created_at"2026-04-24T21:26:18.496Z" 4/24/2026, 9:26:18 PM
model"openai/gpt-5.5-20260423"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency15829
moderation_latency(null)
generation_time16852
tokens_prompt46
tokens_completion310
native_tokens_prompt41
native_tokens_completion1178
native_tokens_completion_images0
native_tokens_reasoning951
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"
usage0.035545
router(null)
provider_responses
0
endpoint_id"58e5b336-423e-430b-a2ab-8bc353f0c51b"
id"resp_04b154aa93d78c970169ebdffa8ff8819686142ef87a4a8f01"
is_byokfalse
latency232
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-1777065978-GiXhUqySi7cKfxwpDCnG"
session_id(null)
api_type"completions"
id"gen-1777065978-4t6GQDPZTjd1i39UMlbO"
upstream_id"resp_04b154aa93d78c970169ebdffa8ff8819686142ef87a4a8f01"
total_cost0.035545
cache_discount(null)
upstream_inference_cost0
provider_name"OpenAI"
response_cache_source_id(null)

Evaluation details

Result Evaluator Details Meta Data
95.63% Matches word count n/a
neededCleanfalse
sentences9
wordCounts
020
120
221
320
420
520
620
720
820