Run: 2026-10-08-01M4DA1YEKHA044B1SW5S9SGQK

Run Details

Duration:
12.4s
Cost:
$0.001588
Provider:
Claude Platform on AWS

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
The rain had fallen over Ashford Hollow since midnight, washing the cobblestones of Crane Street until they gleamed like bone. Detective Inspector Margaret Lowell stood beneath the flickering streetlamp outside number nine, her breath clouding in the bitter cold air. Behind her, uniformed officers murmured into radios while the ambulance doors stood open, their red lights painting the wet facades. Lowell had seen death in many grim forms, yet nothing had prepared her for the terrible stillness of Edward Harcourt. The old man lay face down on the rug, one hand stretched toward a fallen brandy glass and scattered pearls. Somewhere in the house a clock struck three, and every guest who had sworn silence suddenly turned toward the staircase. Lowell crouched beside the body, pulled on thin gloves, and began reading the room like a page of deliberate lies. Nothing about the scene was as neat as it first appeared, and she fully intended to find out exactly why.
created_at"2026-10-08T08:28:39.771Z" 10/8/2026, 8:28:39 AM
model"anthropic/claude-haiku-5.5-20261007"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency12392
moderation_latency(null)
generation_time12392
tokens_prompt46
tokens_completion242
native_tokens_prompt62
native_tokens_completion3163
native_tokens_completion_images(null)
native_tokens_reasoning2834
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"end_turn"
service_tier"default"
usage0.0015877
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer(null)
request_id"req-1791448119-jZbLuQcy4AVdgAKc6srA"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1791448119-iItiCAfWQoB0pDhzeaI4"
upstream_id"msg_011CfpTLJKedmJEQRHDn8s6b"
provider_responses
0
endpoint_id"b6cdf493-3a61-441f-a134-e7944fddb980"
id"msg_011CfpTLJKedmJEQRHDn8s6b"
is_byokfalse
latency760
model_permaslug"anthropic/claude-haiku-5.5-20261007"
provider_name"Claude Platform on AWS"
status200
total_cost0.0015877
cache_discount(null)
upstream_inference_cost0
provider_name"Claude Platform on AWS"
response_cache_source_id(null)
data_region"global"
workspace_id"97e315e5-d303-487d-83c1-83180e8a13d4"

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