Run: 2026-02-24-01KJ8TPP0BBZ7PZCVDZAP61F0R

Run Details

Duration:
2m 38s
Cost:
$0.240513
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 stood alone at the very edge of Harrow Bay, its single lantern slicing through cold November darkness. Detective Clara Marsh stepped out from her car just after midnight, the rain already soaking deeply through her wool coat. The emergency call had come in at eleven forty, a frantic voice reporting something terrible near the old keeper's cottage. She had not fully prepared herself for what waited just inside the lighthouse door, partly hidden beneath a dark blanket. The blanket had slipped, revealing a man who lay face down on the cold stone floor, one arm stretched out. His tailored dark evening suit and polished gold cufflinks told Marsh that this man had not expected to sleep here. There was absolutely no visible sign of blood, yet something about the cruel angle of his neck told Marsh everything. She crouched carefully down beside the body, pulling on gloves, and slowly studied the pale face turned toward the wall. She suddenly recognized him, even in death, even in that suffocating cold darkness, and felt her whole body go still. He was Victor Crane, a man that half the town truly despised and the other half quietly but deeply feared. Marsh stood up slowly, gazed at the rain hammering down against the single lighthouse window, and reached for her phone.
created_at"2026-02-24T22:00:51.477Z" 2/24/2026, 10:00:51 PM
model"anthropic/claude-4.6-sonnet-20260217"
app_id182717
external_user(null)
streamedtrue
cancelledfalse
latency512
moderation_latency180
generation_time158258
tokens_prompt46
tokens_completion3435
native_tokens_prompt61
native_tokens_completion16022
native_tokens_completion_images(null)
native_tokens_reasoning3110
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"
usage0.240513
router(null)
provider_responses
0
endpoint_id"6d408764-7dd7-4626-bb87-a6cc1589bc86"
id"msg_0141FwwxpwYhUjDdvmRhVRay"
is_byokfalse
latency490
model_permaslug"anthropic/claude-4.6-sonnet-20260217"
provider_name"Anthropic"
status200
api_type"completions"
id"gen-1771970451-09lsU9fKw4cTFw28HhxQ"
upstream_id"msg_0141FwwxpwYhUjDdvmRhVRay"
total_cost0.240513
cache_discount(null)
upstream_inference_cost0
provider_name"Anthropic"

Evaluation details

Result Evaluator Details Meta Data
100.00% Matches word count n/a
neededCleanfalse
sentences11
wordCounts
020
120
220
320
420
520
620
720
820
920
1020