Run: 2026-10-08-01M4DAKR006B429YPM5SBVCNVK

Run Details

Duration:
3.3s
Cost:
$0.000180
Provider:
Claude Platform on AWS

Evaluation summary

Score Evaluator
Details Link
73.95% 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 Ashford Manor tonight. Detective Mara Quinn arrived at the gates after midnight. Her flashlight cut through the thick, dripping fog ahead. Somewhere inside, a clock struck twelve, slow and mournful. The butler met her at the door, pale and trembling. "Lord Harrow is dead," he whispered, glancing nervously behind him. Mara stepped across the threshold, boots squelching on marble tiles. The study door stood slightly ajar, spilling dim amber light. Inside, the old man sat slumped over his mahogany desk. A single silver letter opener protruded from his back. Mara knelt beside the body, studying each detail carefully. The ink on his blotter was still wet. Someone had been writing him a letter moments ago. Her eyes drifted toward the open window, where a curtain fluttered. Outside, footsteps crunched quickly across the gravel and vanished. Mara rose slowly, her pulse quickening with dread. Tonight, somebody in this house had lied to her.
created_at"2026-10-08T08:38:22.984Z" 10/8/2026, 8:38:22 AM
model"anthropic/claude-haiku-5.5-20261007"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency684
moderation_latency(null)
generation_time3232
tokens_prompt46
tokens_completion242
native_tokens_prompt62
native_tokens_completion347
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"
usage0.0001797
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer(null)
request_id"req-1791448702-YHWEVPme8MjKbl5Am44u"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1791448702-d44mAJwtfp4ZGp8nDblG"
upstream_id"msg_011CfpU5J3yuc9ZhJrNjLoR6"
provider_responses
0
endpoint_id"b6cdf493-3a61-441f-a134-e7944fddb980"
id"msg_011CfpU5J3yuc9ZhJrNjLoR6"
is_byokfalse
latency684
model_permaslug"anthropic/claude-haiku-5.5-20261007"
provider_name"Claude Platform on AWS"
status200
total_cost0.0001797
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
73.95% Matches word count n/a
neededCleanfalse
sentences17
wordCounts
08
19
29
39
410
510
610
710
810
99
109
118
129
1311
149
158
169