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Run: 2026-02-24-01KJ8VKNZV0QR2RKN4T7Z5H20Y
Run Details
Model:
Claude Opus 4.6 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
43.9s
Cost:
$0.090080
Provider:
Amazon Bedrock
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
Messages
Meta
AI
The body lay crumpled at the foot of the grand staircase, its pale hands still clutching a torn bloodstained letter. Detective Clara Marsh ducked under the yellow crime scene tape and stepped into the cold marble foyer of Ashworth Manor. The chandelier above cast fractured light across the dead man's face, revealing an expression frozen somewhere between shock and rage. She knelt beside the victim and noticed the faint smell of almonds drifting up from his slightly parted blue lips. No one had heard a thing, or so every single resident of this sprawling estate was now desperate to claim. The victim was Edmund Ashworth, the patriarch of one of the wealthiest and most secretive families in the entire county. His wife stood at the top of the staircase, perfectly composed, watching the detective work with unsettling calm and stillness. Clara looked up at her and knew immediately that this woman was hiding something dark beneath her elegant porcelain mask. Rain hammered against the tall windows as thunder rolled across the hills, sealing every suspect inside the house with her. She pulled out her notebook, clicked her pen, and silently vowed that the dead man's secrets would not stay buried.
created_at
"2026-02-24T22:16:41.733Z"
2/24/2026, 10:16:41 PM
model
"anthropic/claude-4.6-opus-20260205"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1613
moderation_latency
154
generation_time
43708
tokens_prompt
46
tokens_completion
584
native_tokens_prompt
61
native_tokens_completion
3591
native_tokens_completion_images
(null)
native_tokens_reasoning
265
native_tokens_cached
0
num_media_prompt
(null)
num_input_audio_prompt
(null)
num_media_completion
0
num_search_results
(null)
origin
"https://ncbench.com/"
is_byok
false
finish_reason
"stop"
native_finish_reason
"stop"
usage
0.09008
router
(null)
provider_responses
0
endpoint_id
"a8708fb9-08ea-43bb-a3b1-165c87ef09df"
id
"61a7d674-4e28-4327-a661-2efe911f87b3"
is_byok
false
latency
1520
model_permaslug
"anthropic/claude-4.6-opus-20260205"
provider_name
"Amazon Bedrock"
status
200
api_type
"completions"
id
"gen-1771971401-DZ70W2tpNqmeIVVW1t2E"
upstream_id
"61a7d674-4e28-4327-a661-2efe911f87b3"
total_cost
0.09008
cache_discount
(null)
upstream_inference_cost
0
provider_name
"Amazon Bedrock"
Evaluation details
Result
Evaluator
Details
Meta Data
100.00%
Matches word count
n/a
neededClean
false
sentences
10
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
20
7
20
8
20
9
20