Run: 2026-04-24-01KQ0PBX4RPPHFX0ZCDPB6M74R

Run Details

Duration:
22.7s
Cost:
$0.050245
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 threads across Blackwood Manor's windows as Inspector Vale arrived, summoned by a bell no living hand rang twice. Inside, twelve guests waited beneath chandeliers, their faces pale with secrets, while Lord Ashbury lay cooling in the library alone. A chessboard rested beside his chair, all pieces standing except the black king, which was missing from the board entirely. On the carpet, a single white rose bled crimson where someone had pressed it into the dead man's wound deeply. Vale removed his gloves slowly, noticing the fireplace smoke drift sideways, though every door and window stood firmly shut tight. Lady Ashbury whispered that her husband had feared supper, clocks, and the portrait watching from above the mantel each night. Before Vale could answer, the hall clock struck thirteen, and someone laughed behind the locked library door upstairs in darkness. The inspector studied the guests and knew one of them had already arranged another death before midnight with terrible care.
created_at"2026-04-24T21:29:37.696Z" 4/24/2026, 9:29:37 PM
model"openai/gpt-5.5-20260423"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency22118
moderation_latency(null)
generation_time22372
tokens_prompt46
tokens_completion820
native_tokens_prompt41
native_tokens_completion1668
native_tokens_completion_images0
native_tokens_reasoning1474
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"
usage0.050245
router(null)
provider_responses
0
endpoint_id"58e5b336-423e-430b-a2ab-8bc353f0c51b"
id"resp_08cf1b9cbc5b8d230169ebe0c1c8108195b1ae869667e39cf7"
is_byokfalse
latency254
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-1777066177-D3lRPfp3FXVVflJOK7FI"
session_id(null)
api_type"completions"
id"gen-1777066177-0uaRSQcThfxRz0w3Znhy"
upstream_id"resp_08cf1b9cbc5b8d230169ebe0c1c8108195b1ae869667e39cf7"
total_cost0.050245
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