Run: 2026-10-08-01M4D9W8MGE90ZXZQ408GB43FV

Run Details

Duration:
19.6s
Cost:
$0.002156
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 all night on Harrow Lane, washing the old streetlamps into smeared pools of trembling amber light. Detective Inspector Mara Quill stood beside the wet iron gate, her breath clouding in the bitter November air above it. Behind her, uniformed officers stretched yellow tape across the hedges, muttering quietly among themselves about the unusually early hour today. Inside the shadowed conservatory, the body of Lord Edmund Ashcombe lay slumped across a wicker chair beside an overturned teacup. Nobody had touched the teacup, which still held a dark residue that smelled faintly of bitter almonds and something sweeter. Mara crouched beside the body, noting the stiff fingers, the torn lace cuff, and the muddy footprint near the door. Her partner, Sergeant Tom Hale, lingered in the doorway, scribbling notes with a stubby pencil he kept nervously chewing on. Mara stood, brushed grit from her knees, and studied the room with quiet patience that had earned her a reputation. Nothing in the room had been disturbed, so the killer had either been invited in or known this house intimately. Mara turned toward the window, where a strange faint reflection caught her eye, and whispered quietly this was no accident.
created_at"2026-10-08T08:25:33.804Z" 10/8/2026, 8:25:33 AM
model"anthropic/claude-haiku-5.5-20261007"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency2362
moderation_latency(null)
generation_time19349
tokens_prompt46
tokens_completion826
native_tokens_prompt62
native_tokens_completion4299
native_tokens_completion_images(null)
native_tokens_reasoning3878
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"
usage0.0021557
router(null)
user_agent"langchainjs-openai/1.0.0 ((node/v24.21.0; linux; x64))"
http_referer(null)
request_id"req-1791447933-YqgCwpwaljnazeKJGyxm"
session_id(null)
preset_id(null)
api_type"completions"
id"gen-1791447933-vyWSJk0ZXIyqhF9l7S07"
upstream_id"msg_011CfpT6bCX7aizLT4SFdRG7"
provider_responses
0
endpoint_id"b6cdf493-3a61-441f-a134-e7944fddb980"
id"msg_011CfpT6bCX7aizLT4SFdRG7"
is_byokfalse
latency808
model_permaslug"anthropic/claude-haiku-5.5-20261007"
provider_name"Claude Platform on AWS"
status200
total_cost0.0021557
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
sentences10
wordCounts
020
120
220
320
420
520
620
720
820
920