Run: 2026-10-08-01M4DA89WJHEJH3XT13M9851ES

Run Details

Duration:
12.4s
Cost:
$0.001602
Provider:
Claude Platform on AWS

Evaluation summary

Score Evaluator
Details Link
94.38% 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 not stopped for three days, and Hollow Creek seemed to sink slowly beneath its own gray weight. Detective Inspector Eleanor Vance stood at the edge of the lake, her coat soaked through, staring at the pale body. The victim was Julian Ashworth, a wealthy banker whose famous charm had made him both deeply admired and quietly feared. Nobody in the village had liked him, yet nobody had expected him to die so violently in the flooded boathouse. Constable Thomas Reed lifted the yellow tape, glancing nervously at the small bloody handprint smeared across the cold window glass. Eleanor crouched beside the dark water, noticing a single silver key caught tangled between the reeds near the wooden dock. It was not the sort of clue a careful killer would leave behind, and it deeply troubled her instincts.
created_at"2026-10-08T08:32:08.09Z" 10/8/2026, 8:32:08 AM
model"anthropic/claude-haiku-5.5-20261007"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency12332
moderation_latency(null)
generation_time12333
tokens_prompt46
tokens_completion204
native_tokens_prompt62
native_tokens_completion3192
native_tokens_completion_images(null)
native_tokens_reasoning2911
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"
usage0.0016022
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer(null)
request_id"req-1791448328-rHPfXKGnaqg5JQsicc9I"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1791448328-lzc8CeycyIQzCeev4cIr"
upstream_id"msg_011CfpTbehAyys9VPHf1yJrP"
provider_responses
0
endpoint_id"b6cdf493-3a61-441f-a134-e7944fddb980"
id"msg_011CfpTbehAyys9VPHf1yJrP"
is_byokfalse
latency726
model_permaslug"anthropic/claude-haiku-5.5-20261007"
provider_name"Claude Platform on AWS"
status200
total_cost0.0016022
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
94.38% Matches word count n/a
neededCleanfalse
sentences7
wordCounts
020
120
220
320
420
520
619