Run: 2026-02-18-01KHQ93HNJYHXE15N2B0EZCZP4

Run Details

Duration:
6.2s
Cost:
$0.003717
Provider:
Anthropic

Evaluation summary

Score Evaluator
Details Link
15.76% 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 at the edge of town, its beam cutting through the thick November fog. Nobody had visited the lighthouse keeper, Mr. Aldous Finch, for three long weeks until young Sara arrived. Sara climbed the winding iron staircase slowly, her lantern casting strange dancing shadows across the cold stone walls. At the very top, she pushed open the heavy wooden door and immediately felt something was terribly wrong. The room was completely overturned, papers scattered everywhere, and a half-eaten meal sat rotting on the table. Then she saw him, slumped against the far wall, his pale hand clutching a torn red envelope. Sara pressed her back against the door frame, her breath coming out in short and desperate little gasps. She forced herself to step closer, her boots crunching on broken glass that covered the entire stone floor. The envelope in his hand bore a single word, written in dark ink that Sara prayed was not blood. Outside, the foghorn moaned across the black water, as if the sea itself already knew the terrible truth.
created_at"2026-02-18T02:26:19.944482+00:00" 2/18/2026, 2:26:19 AM
model"anthropic/claude-4.6-sonnet-20260217"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency442
moderation_latency(null)
generation_time6142
tokens_prompt46
tokens_completion280
native_tokens_prompt44
native_tokens_completion239
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"
usage0.003717
router(null)
provider_responses
0
id"msg_01A2Dtig5pSD1FGNCV4q3PYH"
status200
is_byokfalse
latency442
endpoint_id"6d408764-7dd7-4626-bb87-a6cc1589bc86"
provider_name"Anthropic"
model_permaslug"anthropic/claude-4.6-sonnet-20260217"
api_type"completions"
id"gen-1771381573-OPxQr6yM0WEnwvIhVWh8"
upstream_id"msg_01A2Dtig5pSD1FGNCV4q3PYH"
total_cost0.003717
cache_discount(null)
upstream_inference_cost0
provider_name"Anthropic"

Evaluation details

Result Evaluator Details Meta Data
15.76% Matches word count n/a
neededCleanfalse
sentences10
wordCounts
018
117
218
318
418
517
618
718
819
918