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Run: 2026-02-24-01KJ8W09QRRSAF0Z2F5MDKPCG8
Run Details
Model:
Claude Opus 4.6 (Reasoning)
Test:
N-Length Sentences
Scenario:
Write sentences with 20 words each
Duration:
49.3s
Cost:
$0.089455
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, pale hands still clutching a broken string of pearls. Detective Sarah Morgan stepped through the front door and immediately felt the heavy silence pressing against her tired, aching bones. The mansion smelled of old money and fresh death, a combination she had grown far too familiar with over time. A maid stood trembling in the corner of the parlor, her white apron stained with drops of deep red blood. She said she had discovered the body at half past nine, but her trembling voice seemed to betray something darker. Outside, rain hammered the tall windows while thunder rolled across the black hills surrounding the isolated estate like a warning. No one had entered or left the property since midnight, which meant the killer was still somewhere inside the house. Morgan knelt beside the victim and studied the deep bruises circling his throat like the fingers of some violent ghost. The dead man was Richard Holloway, owner of the estate and patriarch of a family built on carefully hidden secrets. His three children waited upstairs in separate rooms, each one claiming ignorance and grief in almost perfectly rehearsed measured tones. Morgan stood slowly and looked up the long staircase into the darkness where the shadows seemed to breathe and watch. Someone in this house had killed tonight, and she knew with cold certainty that the truth would not come easily.
created_at
"2026-02-24T22:23:35.169Z"
2/24/2026, 10:23:35 PM
model
"anthropic/claude-4.6-opus-20260205"
app_id
182717
external_user
(null)
streamed
true
cancelled
false
latency
1763
moderation_latency
330
generation_time
48918
tokens_prompt
46
tokens_completion
1525
native_tokens_prompt
61
native_tokens_completion
3566
native_tokens_completion_images
(null)
native_tokens_reasoning
1145
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
0.089455
router
(null)
provider_responses
0
endpoint_id
"a8708fb9-08ea-43bb-a3b1-165c87ef09df"
id
"90ba547d-7151-4ff4-ab20-c976837dbb71"
is_byok
false
latency
1728
model_permaslug
"anthropic/claude-4.6-opus-20260205"
provider_name
"Amazon Bedrock"
status
200
api_type
"completions"
id
"gen-1771971815-myOryawLyqP1Clia7E1X"
upstream_id
"90ba547d-7151-4ff4-ab20-c976837dbb71"
total_cost
0.089455
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
12
wordCounts
0
20
1
20
2
20
3
20
4
20
5
20
6
20
7
20
8
20
9
20
10
20
11
20