Run: 2026-10-08-01M4DYMTTC6K2J06W5HK0KWCJA

Run Details

Duration:
2.9s
Cost:
$0.000139
Provider:
Claude Platform on AWS

Evaluation summary

Score Evaluator
Details Link
55.12% Matches word count (details)

Model input

User/Human
Please write the opening scene of a murder mystery where each sentence has exactly 10 words. Please make sure that each sentence has the same length. Only return the opening itself.

Model response

AI
The rain fell hard on the silent manor tonight. Detective Mara Vance stepped carefully across the blood-streaked marble floor. Nobody had touched the body since the scream. Her flashlight swept over the overturned crystal decanter. Three guests stood huddled near the grand staircase, whispering nervously. The butler kept glancing toward the locked study door. Someone in this house had lied about the timing. Mara knelt beside the victim and studied his hands. His fingers were stained with dark blue ink. A torn letter lay crumpled beneath the velvet armchair. She picked it up and read one line. "Meet me at midnight, or everything ends." Footsteps echoed somewhere above her in the hall. Mara slipped the letter into her coat pocket quickly. The murderer was still inside this house.
created_at"2026-10-08T14:28:30.17Z" 10/8/2026, 2:28:30 PM
model"anthropic/claude-haiku-5.5-20261007"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency891
moderation_latency(null)
generation_time2806
tokens_prompt46
tokens_completion197
native_tokens_prompt62
native_tokens_completion266
native_tokens_completion_images(null)
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"end_turn"
service_tier"default"
usage0.0001392
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer(null)
request_id"req-1791469710-lEA7V93umpi9MOEMJlMM"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1791469710-p60uP8WTFXRxBJZVwQMY"
upstream_id"msg_011Cfpvmpj6HQDoQfSUn13MC"
provider_responses
0
endpoint_id"b6cdf493-3a61-441f-a134-e7944fddb980"
id"msg_011Cfpvmpj6HQDoQfSUn13MC"
is_byokfalse
latency891
model_permaslug"anthropic/claude-haiku-5.5-20261007"
provider_name"Claude Platform on AWS"
status200
total_cost0.0001392
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
55.12% Matches word count n/a
neededCleanfalse
sentences14
wordCounts
09
110
28
38
410
59
69
79
88
99
108
1115
129
137