Run: 2026-02-18-01KHQ93J1Q5QVM5MTMQJ84SNA7

Run Details

Duration:
7.0s
Cost:
$0.003897
Provider:
Anthropic

Evaluation summary

Score Evaluator
Details Link
22.70% 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 old lighthouse stood alone on the cliff, its beam cutting through the thick, suffocating fog below. Detective Clara Marsh arrived at the scene just as the sun began its slow, reluctant rise above the horizon. She stepped carefully over the yellow tape, her boots crunching on the wet gravel path leading inside. The body of renowned art collector Edmund Price lay sprawled across the cold, unforgiving stone floor within. His eyes were wide open, staring at nothing, frozen in an expression that suggested profound and terrible surprise. A single red rose had been placed delicately on his chest, its petals still impossibly, disturbingly fresh. Clara crouched down beside him, pulling on her gloves, studying every small detail with her sharp, practiced eyes. The lighthouse keeper, an old man named Silas, stood trembling in the corner, clutching his weathered cap tightly. He claimed he had found the body at midnight, though something about his story felt deeply and profoundly wrong. Clara stood up slowly, surveying the circular room, knowing with grim certainty that nothing here was accidental at all.
created_at"2026-02-18T02:26:21.180049+00:00" 2/18/2026, 2:26:21 AM
model"anthropic/claude-4.6-sonnet-20260217"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency462
moderation_latency(null)
generation_time6963
tokens_prompt46
tokens_completion294
native_tokens_prompt44
native_tokens_completion251
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)
origin"https://ncbench.com/"
is_byokfalse
finish_reason"stop"
native_finish_reason"stop"
usage0.003897
router(null)
provider_responses
0
id"msg_01X3867WznuYg9U5CkTApAhq"
status200
is_byokfalse
latency446
endpoint_id"6d408764-7dd7-4626-bb87-a6cc1589bc86"
provider_name"Anthropic"
model_permaslug"anthropic/claude-4.6-sonnet-20260217"
api_type"completions"
id"gen-1771381573-zhVFnAJV2a5izxv5b8A1"
upstream_id"msg_01X3867WznuYg9U5CkTApAhq"
total_cost0.003897
cache_discount(null)
upstream_inference_cost0
provider_name"Anthropic"

Evaluation details

Result Evaluator Details Meta Data
22.70% Matches word count n/a
neededCleanfalse
sentences10
wordCounts
017
119
217
317
418
517
618
718
819
919