Run: 2026-02-24-01KJ8VH6KK6W6N5Q1M3PEBNAS3

Run Details

Duration:
1m 54s
Cost:
$0.181998
Provider:
Anthropic

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 old lighthouse keeper found the body at dawn, just as the thick grey fog had swallowed everything around him. She lay face down on the cold, wet rocks, her pale outstretched hand reaching desperately toward the dark churning water. Her deep red evening dress had fanned out around her like a wound, and the keeper knew this was murder. He stumbled backward in shock and knocked over his old lantern, casting wild and dancing shadows across the wet stones. He had seen death before in his long years alone, but never anything this deliberate, this precise, this utterly cold. Detective Mara Quinn received the call at three in the morning, pulling her gray coat tight against the coastal wind. She drove the winding cliff road entirely alone, her headlights cutting through the thick fog like a pale uncertain blade. When she finally arrived, the old keeper sat on a rock, staring blankly down at his trembling and weathered hands. He looked up at Quinn with hollow eyes and said only one thing: she did not belong to the sea. Quinn knelt beside the dead woman and noticed immediately that her elegant shoes were entirely free of sand or mud. Someone had carried her here and then placed her perfectly, like a painting intended for someone very specific to find. The cold wind picked up then, scattering Quinn's dark hair across her face as the lighthouse beam swept past again. In that brief flash of light, she noticed something no one else had thought to find: a folded white note. It had been carefully placed beneath the woman's right hand, as though the killer had wanted it to be found. Quinn pulled on her gloves and unfolded the note with steady hands, though her heart was beating very fast now. Three words had been written inside in a small, deliberate script, and each one felt like a very personal threat. The note read simply, Welcome back, Quinn, and in that moment she felt the cold blood drain from her face.
created_at"2026-02-24T22:15:20.441Z" 2/24/2026, 10:15:20 PM
model"anthropic/claude-4.6-sonnet-20260217"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency641
moderation_latency(null)
generation_time113797
tokens_prompt46
tokens_completion2669
native_tokens_prompt61
native_tokens_completion12121
native_tokens_completion_images(null)
native_tokens_reasoning2181
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"
usage0.181998
router(null)
provider_responses
0
endpoint_id"6d408764-7dd7-4626-bb87-a6cc1589bc86"
id"msg_016jCQnkUd5Gd7eY8nDyhNej"
is_byokfalse
latency621
model_permaslug"anthropic/claude-4.6-sonnet-20260217"
provider_name"Anthropic"
status200
api_type"completions"
id"gen-1771971320-odqUVlnab6aeFISEcuhC"
upstream_id"msg_016jCQnkUd5Gd7eY8nDyhNej"
total_cost0.181998
cache_discount(null)
upstream_inference_cost0
provider_name"Anthropic"

Evaluation details

Result Evaluator Details Meta Data
100.00% Matches word count n/a
neededCleanfalse
sentences17
wordCounts
020
120
220
320
420
520
620
720
820
920
1020
1120
1220
1320
1420
1520
1620