Run: 2026-10-08-01M4DA4FHZCX7S7VCFE8MGNCHA

Run Details

Duration:
13.6s
Cost:
$0.001730
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 on Ashford Manor for three long days, and nobody believed the storm would ever finally break. At nine thirty, Eleanor Vance descended the grand staircase, clutching a single unopened letter and her silver pocket watch tightly. Nobody had seen the envelope arrive, yet every single person in the house somehow knew exactly what the letter contained. Her husband, Charles, was already waiting in the library, pouring brandy with unsteady hands that trembled beneath the flickering lamplight. Outside, the gravel drive glistened silver under the pale moon, and the old gardener's lantern swayed near the iron gate. Nobody noticed the figure slipping through the servants' entrance, nor the muddy footprints it left behind on the stone floor. By midnight the house would fall completely silent, and one of its sleeping occupants would never again wake up alive.
created_at"2026-10-08T08:30:02.825Z" 10/8/2026, 8:30:02 AM
model"anthropic/claude-haiku-5.5-20261007"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency13521
moderation_latency(null)
generation_time13521
tokens_prompt46
tokens_completion220
native_tokens_prompt62
native_tokens_completion3448
native_tokens_completion_images(null)
native_tokens_reasoning3160
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"
usage0.0017302
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer(null)
request_id"req-1791448202-JKu23fYahbPaLw7GaxSl"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1791448202-lU7hIoJopieBlPq2dbw3"
upstream_id"msg_011CfpTSRhaGXB5hA1EZ8hcW"
provider_responses
0
endpoint_id"b6cdf493-3a61-441f-a134-e7944fddb980"
id"msg_011CfpTSRhaGXB5hA1EZ8hcW"
is_byokfalse
latency778
model_permaslug"anthropic/claude-haiku-5.5-20261007"
provider_name"Claude Platform on AWS"
status200
total_cost0.0017302
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
sentences7
wordCounts
020
120
220
320
420
520
620