Run: 2026-04-24-01KQ0PPMCR47T6X1CWWHX629XA

Run Details

Duration:
16.1s
Cost:
$0.032005
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 lines across Blackthorn Manor's windows while Inspector Vale arrived beneath a moonless sky, carrying unanswered telegrams tonight. Inside, the grandfather clock had stopped at midnight, though its brass pendulum still trembled like a guilty witness in darkness. Lady Morwen lay in the library, one gloved hand pointing toward the fireplace, her emerald necklace scattered nearby like tears. No servant admitted hearing screams, yet every face shone pale when Vale mentioned the locked garden door behind the pantry. A trail of muddy footprints crossed the Persian carpet, ending abruptly before the portrait of Morwen's first husband, smiling above. Vale noticed fresh ash in a crystal glass, and the faint scent of almonds hiding beneath lavender polish nearby still. When thunder shook the roof, someone upstairs laughed once, softly, and the dead woman's eyes seemed suddenly amused to Vale. Then the lights failed, leaving the inspector with darkness, breathing strangers, and one impossible question that demanded an answer tonight.
created_at"2026-04-24T21:35:29.183Z" 4/24/2026, 9:35:29 PM
model"openai/gpt-5.5-20260423"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency15121
moderation_latency(null)
generation_time15930
tokens_prompt46
tokens_completion270
native_tokens_prompt41
native_tokens_completion1060
native_tokens_completion_images0
native_tokens_reasoning860
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"
usage0.032005
router(null)
provider_responses
0
endpoint_id"58e5b336-423e-430b-a2ab-8bc353f0c51b"
id"resp_055c2a63fa6c01d20169ebe221511c8194b06bdc891e94a3c8"
is_byokfalse
latency337
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-1777066529-yIR0QGVHWIansfFqVZP6"
session_id(null)
api_type"completions"
id"gen-1777066529-ejn6cLUoXvJKMiZmQymb"
upstream_id"resp_055c2a63fa6c01d20169ebe221511c8194b06bdc891e94a3c8"
total_cost0.032005
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