Run: 2026-10-08-01M4DYT5NKXA235E00360SPCT3

Run Details

Duration:
9.4s
Cost:
$0.001077
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 fell steadily over Harrow Manor, washing the gravel paths clean of footprints while the dark night slowly deepened. Inside the drawing room, Detective Inspector Eleanor Vance stood beside the body of Lord Edmund Ashworth, the wealthy shipping magnate. His throat bore a thin red line, and the crystal decanter beside him lay shattered upon the faded Persian carpet. Nobody in the household had heard a single cry, and every clock in the house had stopped at exactly midnight. Vance crouched beside the fireplace, noticing a glove print etched faintly into the ash, far too small for any guest. Behind her, Sergeant Thomas Greaves cleared his throat, reminding her that the family had gathered in the great library downstairs. Every one of them had a motive, and every one of them had lied at least once since dinner ended. Vance pulled on her gloves, took a breath, and walked toward the library door, knowing the truth waited somewhere inside.
created_at"2026-10-08T14:31:25.117Z" 10/8/2026, 2:31:25 PM
model"anthropic/claude-haiku-5.5-20261007"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency2290
moderation_latency(null)
generation_time9406
tokens_prompt46
tokens_completion527
native_tokens_prompt62
native_tokens_completion2142
native_tokens_completion_images(null)
native_tokens_reasoning1808
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"
usage0.0010772
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer(null)
request_id"req-1791469885-zF8ht1R9dVjPI8epXAbZ"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1791469885-Iaw3rGBCMTLhv5wD89Vx"
upstream_id"msg_011CfpvzigKDF9ZibFmaFxBb"
provider_responses
0
endpoint_id"b6cdf493-3a61-441f-a134-e7944fddb980"
id"msg_011CfpvzigKDF9ZibFmaFxBb"
is_byokfalse
latency790
model_permaslug"anthropic/claude-haiku-5.5-20261007"
provider_name"Claude Platform on AWS"
status200
total_cost0.0010772
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