Run: 2026-04-24-01KQ0PWTHTGA9R3BGMG1JFD0M4

Run Details

Duration:
14.2s
Cost:
$0.028315
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 threads across Blackthorn Manor as Inspector Vale arrived, finding the front doors yawning open like accusations tonight. Inside, the grandfather clock had stopped at midnight, though its pendulum still trembled faintly behind cracked glass in the hall. Lady Marwick lay beneath the chandelier, pearls scattered around her throat like moons escaped from a broken sky above her. Beside her hand rested a playing card, the queen of spades, soaked dark along one corner with fresh red blood. Vale noticed four muddy footprints crossing the marble, each pointing inward, none returning toward the rain outside the doors again. From the library, someone whispered a prayer, then silenced themselves when Vale lifted his lantern toward the voice in warning. The household servants waited on the staircase, pale as laundry, insisting their mistress had hosted no guests after supper ended. Yet twelve wet umbrellas crowded the stand, and one still dripped beside a gentleman's monogrammed cane near the mirror quietly.
created_at"2026-04-24T21:38:52.1Z" 4/24/2026, 9:38:52 PM
model"openai/gpt-5.5-20260423"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency12954
moderation_latency(null)
generation_time14040
tokens_prompt46
tokens_completion530
native_tokens_prompt41
native_tokens_completion937
native_tokens_completion_images0
native_tokens_reasoning737
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"
usage0.028315
router(null)
provider_responses
0
endpoint_id"58e5b336-423e-430b-a2ab-8bc353f0c51b"
id"resp_0d2bb9e64c37b2640169ebe2ec2de0819488ededba07d6e159"
is_byokfalse
latency323
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-1777066732-8AVFMHAwJGhxuMbeYh4l"
session_id(null)
api_type"completions"
id"gen-1777066732-WWtZB2RyR4OzBlCxjqtl"
upstream_id"resp_0d2bb9e64c37b2640169ebe2ec2de0819488ededba07d6e159"
total_cost0.028315
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