Run: 2026-04-24-01KQ0N0WJ1E3V74XGJNEEXB01Q

Run Details

Duration:
19.2s
Cost:
$0.037975
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
At midnight, Blackthorn Manor shuddered beneath rain while Detective Mara Vale arrived, summoned by a bell no living hand rang. The butler opened the door silently, his gloves stained with candle wax and something darker along the trembling seams tonight. Inside, guests clustered near the grand staircase, whispering over brandy glasses as thunder erased every confession before it surfaced properly. Lord Blackthorn lay in the library, one eye open, a silver letter knife flowering from his chest like winter roses. Mara noticed the fire had died, though the poker glowed red beside a puddle spreading toward the hearth's stone tiles. On the desk, a stopped clock pointed to twelve, but its glass was warm beneath her fingertip when touched gently. Beside it, an unsigned note promised vengeance before dawn, written in ink smelling faintly of almonds and bitter smoke tonight. When Mara asked who found him first, every face turned toward the portrait hanging above the corpse in silence together. The painted ancestor smiled thinly, and from behind its frame came one final, impossible drop of blood onto silk wallpaper.
created_at"2026-04-24T21:06:08.074Z" 4/24/2026, 9:06:08 PM
model"openai/gpt-5.5-20260423"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency18340
moderation_latency(null)
generation_time19061
tokens_prompt46
tokens_completion692
native_tokens_prompt41
native_tokens_completion1259
native_tokens_completion_images0
native_tokens_reasoning1034
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"
usage0.037975
router(null)
provider_responses
0
endpoint_id"58e5b336-423e-430b-a2ab-8bc353f0c51b"
id"resp_034fa5069ecd7daf0169ebdb4033bc8196955f62cfe414a76c"
is_byokfalse
latency332
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-1777064768-4K4wDldD6BV4I68sffc5"
session_id(null)
api_type"completions"
id"gen-1777064768-NaDQd0IOx5zxvGsgma02"
upstream_id"resp_034fa5069ecd7daf0169ebdb4033bc8196955f62cfe414a76c"
total_cost0.037975
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
sentences9
wordCounts
020
120
220
320
420
520
620
720
820