Run: 2026-04-24-01KQ0P52CY8HZ9SHWND20E0Y93

Run Details

Model:
GPT-5.5
Duration:
5.2s
Cost:
$0.003715
Provider:
OpenAI

Evaluation summary

Score Evaluator
Details Link
30.83% 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 needled the windows of Blackthorn Manor while nine strangers waited for midnight in the candlelit drawing room upstairs tonight. Detective Mara Vale noticed the grandfather clock had stopped, though its brass pendulum still swung in perfect silence. Lord Eversham smiled at everyone, lifted his crystal glass, and collapsed before the first toast was finished there. The scream came from his widow, but Mara watched the butler pocket something silver with trembling gloved hands. Outside, thunder swallowed the telephone’s final ring, and every door in the old house locked by itself simultaneously.
created_at"2026-04-24T21:25:53.702Z" 4/24/2026, 9:25:53 PM
model"openai/gpt-5.5-20260423"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency2437
moderation_latency(null)
generation_time5024
tokens_prompt46
tokens_completion159
native_tokens_prompt41
native_tokens_completion117
native_tokens_completion_images0
native_tokens_reasoning0
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"
usage0.003715
router(null)
provider_responses
0
endpoint_id"58e5b336-423e-430b-a2ab-8bc353f0c51b"
id"resp_0e7e72b0f479b8e40169ebdfe20c5c8196a10a47459e422e7b"
is_byokfalse
latency589
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-1777065953-GOcZyN5DJU8UkaId4SER"
session_id(null)
api_type"completions"
id"gen-1777065953-IMAiSXLg8zaJEeKskgWv"
upstream_id"resp_0e7e72b0f479b8e40169ebdfe20c5c8196a10a47459e422e7b"
total_cost0.003715
cache_discount(null)
upstream_inference_cost0
provider_name"OpenAI"
response_cache_source_id(null)

Evaluation details

Result Evaluator Details Meta Data
30.83% Matches word count n/a
neededCleanfalse
sentences5
wordCounts
020
118
218
318
418